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Fox ESS High-Voltage Control Box
Model: High-Voltage Control Box · SKU: Not documented
Prepared Nov 12, 2026
Common specifications
| Device type | High-Voltage Control BoxSource [1] |
|---|---|
| Communications | CANSource [1] |
| Supported devices | Our system consists of at least 4 CQ16+ 1 High-Voltage Control Box and up to 15 CQ16+ 1 High-Voltage Control Box.Source [1] |
| Ports | BAT-; DC Switch; BAT+; Power Switch; Status LED; SOC LED; COM; Handle; CAN; P-; PE; P+Source [1] |
| Display | Status LED*1; SOC LED*4Source [1] |
| Power input | Not documented |
| Mounting | Position the High-Voltage Control Box on the top of the battery packs in the rightmost column.Source [1] |
| Enclosure | Not documented |
| Operating temperature | Charge: 0~55; Discharge: -10~55Source [1] |
| Weight | |
| Dimensions | |
| Enclosure volume | 74.24 L** Calculated from recorded external dimensions |
| Warranty term | Not documented |
All recorded specifications
| Accuracy | ±0.5Documented claimTotal voltage measurement accuracy ±0.5 %FSR, as printed. ConditionsTotal voltage measurement accuracy as printed. FSR is not expanded or converted into another accuracy quantity. Location: PDF page 14, Total voltage measurement accuracy (%FSR); exact High-Voltage Control Box table Total voltage measurement accuracy as printed. FSR is not expanded or converted into another accuracy quantity. Location: PDF page 14, Total voltage measurement accuracy (%FSR); exact High-Voltage Control Box table |
|---|---|
| Address / DIP setting (manual) | Not documented ConditionsThe Module addressing failed indication does not provide a numeric address or DIP-switch setting. Location: PDF page 31, fault labels The Module addressing failed indication does not provide a numeric address or DIP-switch setting. Location: PDF page 31, fault labels |
| Battery fuse or breaker (manual) | PDF page 16: Battery protection: Internal Short Circuit, Over Voltage, Over Current, Over Temp, Under Voltage.; PDF page 34: The battery system includes an automatic low-temperature protection feature. it proactively manages. The battery to maintain adequate charge, extending standby time when temperatures drop.; PDF page 35: The CQ battery system has a non-reset table function to stop operation when one or more cells in the battery system deviate from the operating region during operation. This feature shall not be a user reset table or allow for automatic reset. Please ask after sales for help.; PDF page 31: Under voltage fault; PDF page 31: Over voltage fault; PDF page 31: Over temperature fault; PDF page 31: Under temperature fault; PDF page 31: Discharge over current; PDF page 31: Charge over current; PDF page 31: Pre-Charge failed; PDF page 31: AFE communication failed; PDF page 31: Module addressing failed; PDF page 31: BMU communication failed; PDF page 31: PCS communication failed; PDF page 31: HVB FUSE fault; PDF page 31: Module FUSE fault; PDF page 31: Power failed; PDF page 31: Internal total voltage sampling failed; PDF page 31: Temperature sampling failed; PDF page 31: Relay adhesion; PDF page 31: Relay not close; PDF page 31: Relay drive failed; PDF page 31: Single cell "0V" fault; PDF page 31: Temperature high permanent failed; PDF page 31: The single voltage high permanently failed; PDF page 31: SOH low protection; PDF page 31: AFE failed（UV/OV/UT/OT）; PDF page 31: Shutdown failure; PDF page 31: Other faultDocumented claim ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Printed connected-system protection/reserve/lock context. Fault labels and LED legend are not fuse ratings, address settings or a reset procedure. No low-temperature reserve SOC, duration or warming hardware is inferred. The complete symbol-coded LED legend and fault matrix remain in the cited manual, PDF page 31; they are not transcribed as structured specifications. Location: PDF pages 16, 31, 34, 35 High-Voltage Control Box and its connected CQ battery assembly. Printed connected-system protection/reserve/lock context. Fault labels and LED legend are not fuse ratings, address settings or a reset procedure. No low-temperature reserve SOC, duration or warming hardware is inferred. The complete symbol-coded LED legend and fault matrix remain in the cited manual, PDF page 31; they are not transcribed as structured specifications. Location: PDF pages 16, 31, 34, 35 |
| Cable bending radius / connector notes (manual) | R≥6×DDocumented claim ConditionsPrinted diagram relation R≥6×D, external controller-to-inverter cable only. D/D' definitions and an absolute radius are not inferred. Separate diagram vertical ≥30cm, angle ≥90° and strict prose >30cm remain together in the connection field. Location: PDF page 27 Printed diagram relation R≥6×D, external controller-to-inverter cable only. D/D' definitions and an absolute radius are not inferred. Separate diagram vertical ≥30cm, angle ≥90° and strict prose >30cm remain together in the connection field. Location: PDF page 27 |
| Communication ports (manual) | PDF page 17: High-Voltage Control Box interface: BAT-: BAT negative terminal; PDF page 17: High-Voltage Control Box interface: DC Switch: Power switch, battery charge and discharge circuit switch; PDF page 17: High-Voltage Control Box interface: BAT+: BAT positive terminal; PDF page 17: High-Voltage Control Box interface: Power Switch: Battery charge and discharge circuit switch; PDF page 17: High-Voltage Control Box interface: Status LED / SOC LED: LED display specific alarm information and battery system power; PDF page 17: High-Voltage Control Box interface: COM: Communication interface with the battery pack; PDF page 17: High-Voltage Control Box interface: Handle: DC Switch Handle; PDF page 17: High-Voltage Control Box interface: CAN: Battery and inverter communication port; PDF page 17: High-Voltage Control Box interface: P-: High-Voltage Control Box negative terminal, connected to hybrid inverter's negative terminal; PDF page 17: High-Voltage Control Box interface: PE: Ground terminal, connected to the hybrid inverter; PDF page 17: High-Voltage Control Box interface: P+: High-Voltage Control Box positive terminal, connected to hybrid inverter's positive terminal; PDF page 24: Use communication cable（Item O）to connect the first battery "INCOM (white)" from the high-voltage box "OUTCOM (yellow)". The communication cable (Item O, U) between other battery packs are connected in sequence from "OUTCOM" to "INCOM". (Refer to the illustration below: Following the direction indicated by the arrows, insert the communication cables harness in the color sequence “yellow, white, yellow, white...”.) ② Use cable ties (Item C) to fix the cable. Note: When connecting cables, observe the installation diagram and pay attention to the direction of the communication cables. Otherwise, the products may not work properly. All wiring harnesses and brads supplied by FOX.; PDF page 27: High-Voltage Control Box external CAN pinout, PIN / Function Definitions: 1 A-START; 2 GND; 3 /; 4 BMS-CANL; 5 BMS-CANH; 6 BMS-CANH; 7 BMS-CANL; 8 /.; PDF page 30: High-Voltage Control Box: Status LED*1; SOC LED*4. The labels remain separate, with no summed total.; PDF page 30: SOC indication tables and native color/symbol layout are retained in the manual on PDF page 30; no unverified flattened symbol-to-color mapping is assigned.Documented claim ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Controller external CAN pinout is separate from module COM1/COM2 ports. Status LED*1 and SOC LED*4 stay separate labels without a summed count. Native SOC symbol/color layout is retained in the cited document, not reconstructed from flattened text. Location: PDF pages 17, 24, 27, 30 High-Voltage Control Box and its connected CQ battery assembly. Controller external CAN pinout is separate from module COM1/COM2 ports. Status LED*1 and SOC LED*4 stay separate labels without a summed count. Native SOC symbol/color layout is retained in the cited document, not reconstructed from flattened text. Location: PDF pages 17, 24, 27, 30 |
| Communication terminal torque (manual) | Not documented ConditionsNo communication-connector torque is printed in the reviewed manual. Location: Reviewed CQ16 manual, PDF pages 1-37 No communication-connector torque is printed in the reviewed manual. Location: Reviewed CQ16 manual, PDF pages 1-37 |
| Communications | CANDocumented claim ConditionsPrinted on the manual controller table itself; no CQ BOX identity equivalence is needed or assumed. Location: PDF page 14, Communication interfaces; exact High-Voltage Control Box table Printed on the manual controller table itself; no CQ BOX identity equivalence is needed or assumed. Location: PDF page 14, Communication interfaces; exact High-Voltage Control Box table |
| Compatibility requirements | PDF page 13: CQ16 is the battery module, it needs to be used with High-Voltage Control Box controller;; PDF page 13: High-Voltage Control Box is the controller of the whole system, so each system must have one High-Voltage Control Box;; PDF page 13: Our system consists of at least 4 CQ16+ 1 High-Voltage Control Box and up to 15 CQ16+ 1 High-Voltage Control Box.; PDF page 8: Do not connect the battery directly to inverter conductors or PV conductors. This will damage the battery and may result in explosion.; PDF page 8: Do not interchange the positive and negative terminals of the battery.; PDF page 8: Ensure that there is no short circuit of the terminals or with any external device.; PDF page 8: Do not exceed the battery voltage rating of the inverter.; PDF page 8: Do not connect the battery to any incompatible inverter.; PDF page 8: Do not connect different battery types together.; PDF page 8: Do not install with other batteries or cells.; PDF page 18: Communication cable (BMS-Inverter) (Only FOX PCS)*1; PDF page 19: Accessory package1 / For1+4System: P Front fixed sheet metal*2; Q Negative connection cable*1; R Base*1; S Handle*4; PDF page 19: Accessory package2: R Base*4; S Handle*4; PDF page 19: Accessory package3 / For1+15System: P Front fixed sheet metal*2; T Base-fixed metal*3; U Communication cable(long)*3; Q Negative connection cable*1; V Power cable(red)*3Documented claim ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Minimum 4 and maximum 15 CQ16 modules with one controller are system counts, not a sale quantity. The supplied J cable label Only FOX PCS is not an exact inverter-model compatibility list. The inverter own manual controls its connection steps. Accessory packages remain separately labeled assembly contexts, not automatic component-package or system-bundle contents. Location: PDF pages 8, 13, 18, 19 High-Voltage Control Box and its connected CQ battery assembly. Minimum 4 and maximum 15 CQ16 modules with one controller are system counts, not a sale quantity. The supplied J cable label Only FOX PCS is not an exact inverter-model compatibility list. The inverter own manual controls its connection steps. Accessory packages remain separately labeled assembly contexts, not automatic component-package or system-bundle contents. Location: PDF pages 8, 13, 18, 19 |
| Conductor sizes | Not documented ConditionsNo AWG or mm² conductor cross-section is printed. Cable counts, tool sizes and pin labels are separate quantities. Location: Reviewed CQ16 manual, PDF pages 1-37 No AWG or mm² conductor cross-section is printed. Cable counts, tool sizes and pin labels are separate quantities. Location: Reviewed CQ16 manual, PDF pages 1-37 |
| Current rating | 240/240Documented claimMax. Charge/Discharge current 240/240 A, as printed. ConditionsLiteral Max. Charge/Discharge current row retained unsplit. The table does not label this Continuous or a measurement range. Location: PDF page 14, Max. Charge/Discharge current (A); exact High-Voltage Control Box table Literal Max. Charge/Discharge current row retained unsplit. The table does not label this Continuous or a measurement range. Location: PDF page 14, Max. Charge/Discharge current (A); exact High-Voltage Control Box table |
| Device type | High-Voltage Control BoxDocumented claim ConditionsThe maker names this the controller of the whole system. Site class system_monitoring_control follows the Lead Engineer ruling; this is not a battery, inverter or standalone DIY BMS. Location: PDF page 13, Product Introduction; PDF page 14, High-Voltage Control Box Specifications The maker names this the controller of the whole system. Site class system_monitoring_control follows the Lead Engineer ruling; this is not a battery, inverter or standalone DIY BMS. Location: PDF page 13, Product Introduction; PDF page 14, High-Voltage Control Box Specifications |
| Dimensions | 810 D × 390 W × 235 H mm31.9 D × 15.4 W × 9.25 H in convertedDocumented claim ConditionsPrinted controller W*H*D dimensions; no system arithmetic. Location: PDF page 14, Dimensions (W*H*D) (mm); exact High-Voltage Control Box table Printed controller W*H*D dimensions; no system arithmetic. Location: PDF page 14, Dimensions (W*H*D) (mm); exact High-Voltage Control Box table |
| Display | Status LED*1; SOC LED*4Documented claim ConditionsPrinted separate controller Status and SOC labels, no summed LED count. Datasheet CQ BOX LED*6 is not transferred without the code identity tie. Location: PDF page 30, For High-Voltage Control Box Printed separate controller Status and SOC labels, no summed LED count. Datasheet CQ BOX LED*6 is not transferred without the code identity tie. Location: PDF page 30, For High-Voltage Control Box |
| Efficiency | >92Documented claimCharge/Discharge efficiency >92%, as printed. ConditionsPrinted Charge/Discharge efficiency, not battery round-trip efficiency. The strict lower bound remains literal. Location: PDF page 14, Charge/Discharge efficiency (%); exact High-Voltage Control Box table Printed Charge/Discharge efficiency, not battery round-trip efficiency. The strict lower bound remains literal. Location: PDF page 14, Charge/Discharge efficiency (%); exact High-Voltage Control Box table |
| External fuse breaker rating | Not documented ConditionsFire instructions mention a circuit breaker and the fault list names HVB/Module FUSE faults, without an external fuse/breaker rating. Location: Reviewed CQ16 manual, PDF pages 1-37 Fire instructions mention a circuit breaker and the fault list names HVB/Module FUSE faults, without an external fuse/breaker rating. Location: Reviewed CQ16 manual, PDF pages 1-37 |
| Ground terminal torque (manual) | Not documented ConditionsNo numerical external PE grounding-screw torque is printed. Fixed grounding-metal E/K fastening is a separate assembly quantity. Location: PDF pages 23 and 26 No numerical external PE grounding-screw torque is printed. Fixed grounding-metal E/K fastening is a separate assembly quantity. Location: PDF pages 23 and 26 |
| Grounding (manual) | PDF page 8: Please ensure that all the batteries are grounded properly.; PDF page 23: The upper and lower two battery packs are fixed with fixed grounding metals (Item E).; PDF page 23: Connect the fixed grounding metals (Item E) between all the batteries.; PDF page 23: The back of the battery also needs to be fixed.A total of four fixed grounding metals (Item E) are required between every two battery packs for fixation.; PDF page 23: The fixed grounding metals have the function of grounding connection. Please connect all the fixed grounding metals.; PDF page 26: Route communication cable (Item J) through right-side cable duct. Step ２ Route grounding cable (Item I) through right-side cable duct and secure with screw. Ensure firm and reliable connection. Step ３ Secure wiring cable with cable ties (Item C). Step ４ Reinstall decorative cover.Documented claim ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Fixed grounding metals E have both fastening and grounding function. External PE screw torque and neutral-earth bonding are not specified; the metal-fastening torque stays separately scoped. Location: PDF pages 8, 23, 26 High-Voltage Control Box and its connected CQ battery assembly. Fixed grounding metals E have both fastening and grounding function. External PE screw torque and neutral-earth bonding are not specified; the metal-fastening torque stays separately scoped. Location: PDF pages 8, 23, 26 |
| Humidity | 5 to 95 %Documented claim ConditionsPrinted 5~95. The CQ BOX datasheet No Condensation wording is not transferred without the code tie. Location: PDF page 14, Humidity (%); exact High-Voltage Control Box table Printed 5~95. The CQ BOX datasheet No Condensation wording is not transferred without the code tie. Location: PDF page 14, Humidity (%); exact High-Voltage Control Box table |
| Included components | A: High-Voltage control box*1; B: High-Voltage control box decorative cover*1; C: Cable ties*20; D: Quick Installation Guide*1; E: Fixed grounding metals*4; F: Positive copper bar*1; G: Power+ cable*3; H: Power- cable*3; I: Grounding cable*1; J: Communication cable (BMS-Inverter) (Only FOX PCS)*1; K: Mounting screw pack*10Documented claim ConditionsExact component package labels and quantities. Preserve mounting screw pack*10 literally, without inferring bags versus screw units or a system total. Accessory packages have separate scope below. Location: PDF page 18, For High-Voltage Control Box Exact component package labels and quantities. Preserve mounting screw pack*10 literally, without inferring bags versus screw units or a system total. Accessory packages have separate scope below. Location: PDF page 18, For High-Voltage Control Box |
| Installation clearances (manual) | PDF page 20, general prose: To ensure proper operation and long battery life, please make sure to leave at least 300mm of cooling space around the battery. Shading or insufficient space for heat dissipation will result in high battery temperatures, which may cause unplanned shutdowns and significantly shorten the service life of the battery.; PDF page 20, single-cluster 3D illustration: ≥50mm arrows, ≥300mm arrows (including top), 50mm between bases. Other direction labels are not invented.; PDF page 20, labeled three-cluster plan: Battery back clearance ≥300mm; Battery side clearance ≥300mm; Clearance between battery clusters ≥300mm; Battery front clearance ≥800mm; between bases 50mm.Needs confirmationGeneral cooling prose says at least 300mm around. Single-cluster 3D arrows include ≥50mm and ≥300mm. The labeled three-cluster plan prints front ≥800mm, with back/side/between-cluster ≥300mm and base spacing 50mm. No universal reconciled clearance is selected. ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Keep all diagram/configuration contexts. General around-battery cooling prose and labeled plan dimensions are not reconciled into one clearance. Location: PDF page 20, prose and separate single-/three-cluster figures High-Voltage Control Box and its connected CQ battery assembly. Keep all diagram/configuration contexts. General around-battery cooling prose and labeled plan dimensions are not reconciled into one clearance. Location: PDF page 20, prose and separate single-/three-cluster figures |
| Inverter interface protection | PDF page 16: Inverter interface protection: Over Voltage, Over Current, External Short Circuit, Reverse Polarity, Ground Fault, Over Temp, In Rush Current.Documented claim ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Printed connected-system inverter-interface protection list, not independent testing or an external protective-device rating. Location: PDF page 16 High-Voltage Control Box and its connected CQ battery assembly. Printed connected-system inverter-interface protection list, not independent testing or an external protective-device rating. Location: PDF page 16 |
| Maintenance schedule | PDF page 33: Regularly check whether the service environment of the battery meets the requirements, and the installation position should be far away from the heat source.; PDF page 33: Regularly check whether the battery and its supporting terminals, connecting cables and indicator lights are normal.; PDF page 34: When the red / green LED on the panel is flashing or normally on, it does not mean that the CQ16 is abnormal, it may be just an alarm or protection. Please check the “LED status indicators” in chapter 9 for the detailed faulty definition before any troubleshooting steps. In general, the alarm indication is normal without manual intervention. When the alarm triggering state is removed, CQ16 will automatically return to normal use. Problem determination based on the following points： Check if the red indicator light illuminates once the battery enters operation; Whether the buzzer in High-Voltage Control Box on; Whether the battery system can be communicated with inverter; Whether the battery can be output voltage or not. Preliminary determination steps Battery system cannot work, when DC Switch on and POWER on, the LED doesn’t light up or flash, please contact the local distributor. The LED display of High-Voltage Control Box and CQ16 is normal, but it cannot charge and discharge. Observe the display screen of inverter and there is no SOC. Please check whether the CAN communication between High-Voltage Control Box to inverter is well connected. If the connection is good, please replace a CAN communication cable. If the SOC is still not visible on the inverter display screen,; PDF page 35: please contact the local distributor. After the battery system is powered on, if you can see the alarm information on the LED and inverter display screen at the same time, please contact the local distributor.Documented claim ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Regular checks and complete preliminary troubleshooting text; no fixed maintenance interval is invented. The manual chapter 9 cross-reference stays as printed. No user reset, firmware update procedure or model compatibility is inferred. Location: PDF pages 33, 34, 35 High-Voltage Control Box and its connected CQ battery assembly. Regular checks and complete preliminary troubleshooting text; no fixed maintenance interval is invented. The manual chapter 9 cross-reference stays as printed. No user reset, firmware update procedure or model compatibility is inferred. Location: PDF pages 33, 34, 35 |
| Manufacturer fire instructions | Sources disagreeNeeds confirmationPage 6 prohibits water; page 8 says dry powder only and no liquid extinguishers; page 10 names FM-200 or CO2 for the battery and ABC for other parts, with safe-disconnection and evacuation conditions. All full passages remain cited without a selected method. ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Different complete connected-battery fire passages remain unresolved; no procedure is chosen. Location: PDF pages 6, 8 and 10 High-Voltage Control Box and its connected CQ battery assembly. Different complete connected-battery fire passages remain unresolved; no procedure is chosen. Location: PDF pages 6, 8 and 10 |
| Mounting | Position the High-Voltage Control Box on the top of the battery packs in the rightmost column.Documented claim ConditionsAssembly position as printed, not a standalone mounting or separate retail-sale claim. Location: PDF page 23, Step3 note Assembly position as printed, not a standalone mounting or separate retail-sale claim. Location: PDF page 23, Step3 note |
| Mounting fastener torque | 3 to 4 N·mDocumented claim ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Literal M5/6, 3~4N·m for shown base P/T/K and fixed-grounding-metal E/K fastening. Do not assign it to external P+/P− or the PE screw. Location: PDF pages 22-23, M5/6 torque pictograms High-Voltage Control Box and its connected CQ battery assembly. Literal M5/6, 3~4N·m for shown base P/T/K and fixed-grounding-metal E/K fastening. Do not assign it to external P+/P− or the PE screw. Location: PDF pages 22-23, M5/6 torque pictograms |
| Mounting hole dimensions | Not documented ConditionsThe tool list prints hammer drill @φ8mm but no complete hole/depth specification is assigned. Location: PDF page 21, tool list The tool list prints hammer drill @φ8mm but no complete hole/depth specification is assigned. Location: PDF page 21, tool list |
| Mounting orientation (manual) | PDF page 21: Position the base (Item R) on the floor at the distance shown in the figure below, and verify levelness using a spirit level.; PDF page 21: When placing the base, it is necessary to ensure that the distance between the bases is 50mm; Otherwise, the base-fixed metals (Item T) in Step 2 will not be able to be installed.; PDF page 22: Two methods are available for handling the battery pack: Method 1: Screw the solid handles (Item S) from the Accessory Package into the pre- tapped mounting holes on the battery pack. Method 2: Use the integral handle slots molded into the battery pack housing.; PDF page 22: By moving the position of the battery pack, the raised sphere on the base will bounce up and restrict the movement of the battery pack.; PDF page 22: Use front fixed sheet metals (Item P) to secure the battery pack and the base. Fix the battery packs at the bottom of the two columns using base-fixed metals (Item T).; PDF page 23: Select the appropriate stacking configuration based on the quantity of battery packs, then handle and stack the High-Voltage Control Box and all CQ16 in accordance with the selected arrangement. ② The upper and lower two battery packs are fixed with fixed grounding metals (Item E). ③ Connect the fixed grounding metals (Item E) between all the batteries. Note： Position the High-Voltage Control Box on the top of the battery packs in the rightmost column. The back of the battery also needs to be fixed.A total of four fixed grounding metals (Item E) are required between every two battery packs for fixation. The fixed grounding metals have the function of grounding connection. Please connect all the fixed grounding metals.Documented claim ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Floor-base and stacking procedures as printed. Controller position is top of the rightmost column. No permission for an unprinted mounting orientation is inferred. Location: PDF pages 21, 22, 23 High-Voltage Control Box and its connected CQ battery assembly. Floor-base and stacking procedures as printed. Controller position is top of the rightmost column. No permission for an unprinted mounting orientation is inferred. Location: PDF pages 21, 22, 23 |
| Operating sequence | PDF page 28: When the grid connected system is started, the inverter should be turned on first to avoid the current pulse of the inverter increasing to the battery pack. All installation and operation must comply with local electrical standards. Check all power cables and communication cables carefully. System Start Up: When the inverter is connected to the PV and the grid and both are operating normally, turn on the battery DC Switch. Press the Power switch and hold it for 3 seconds, then release. The Status LED is blinking green and indicates that the system is working normally. System Shut Down: Press and hold the Power Switch for at least 5 seconds until all of the LEDs (BMS Status LED and SOC LED) begin blinking. Once they start blinking, release the switch. The lights will automatically turn off after 5 seconds. Then, turn off the DC Switch. System Black Start: Under special circumstances when both PV and Grid power are out of order, the battery can be activated through the "Black Start" function. This means that our energy storage inverter and battery can continue to operate. The startup steps for Black Start are as follows: Turn on the DC Switch, press and hold the Power Switch for 3 seconds, then release. Press the Power Switch three times in succession within 4 seconds (Complete within 30 seconds after the battery system starts up). The Status LED remains solid green, indicating successful activation of Black Start mode. Note: Ensure correct battery-inverter connection prior to Black Start. No cable modifications during Black Start.Documented claim ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Full startup, shutdown and black-start passages. POWER/DC controls are on the High-Voltage Control Box; these are connected-system sequences, not standalone module switches or a universal inverter compatibility claim. Location: PDF page 28 High-Voltage Control Box and its connected CQ battery assembly. Full startup, shutdown and black-start passages. POWER/DC controls are on the High-Voltage Control Box; these are connected-system sequences, not standalone module switches or a universal inverter compatibility claim. Location: PDF page 28 |
| Operating temperature | Charge: 0~55; Discharge: -10~55Documented claim ConditionsThe controller table prints separate charge and discharge ranges; no direction-free range is substituted. Location: PDF page 14, Operating temperature (°C); exact High-Voltage Control Box table The controller table prints separate charge and discharge ranges; no direction-free range is substituted. Location: PDF page 14, Operating temperature (°C); exact High-Voltage Control Box table |
| Ports | BAT-; DC Switch; BAT+; Power Switch; Status LED; SOC LED; COM; Handle; CAN; P-; PE; P+Documented claim ConditionsExact printed controller interface labels. Table numbering and repeated connector positions are not interpreted as a new port-count or module-interface claim. Location: PDF pages16-17, High-Voltage Control Box Features diagram and interface table Exact printed controller interface labels. Table numbering and repeated connector positions are not interpreted as a new port-count or module-interface claim. Location: PDF pages16-17, High-Voltage Control Box Features diagram and interface table |
| Power cable installation | PDF page 23: Secure cables and copper bars (Items F, N, V, Q) to battery pack using mounting screw (Item K). Ensure High-Voltage Control Box and CQ16 are sequentially connected in series circuit.; PDF page 23: When connecting copper bar with high voltage, the work must be implemented by professional electrical operators with insulation gloves.; PDF page 23: M5/6; PDF page 23: 3~4N·m; PDF page 25: Remove screw securing decorative cover with screwdriver. Step ２ Remove decorative cover. Step ３ Route power cables (Item G&H) through right-side cable duct. Step ４ Connect all six power cables (Item G&H) individually. Ensure firm and reliable connections.; PDF page 27: See the user manual of the inverter for details on the cable steps.; PDF page 27: Make sure that the power cable connected to the battery is connected vertically and t hat the vertical length is greater than 30cm. If the cable is bent close to the terminals, it may cause poor line contact and result in burnt terminals.; PDF page 27: Power cables must be routed linearly at an appropriate length and must not be subjected to any tensile (pulling) or torsional (twisting) stress. Excess cable length shall not be coiled, looped, or tightly bundled, as this creates an inductive loop effect and severe thermal accumulation. Failure to comply can melt the insulation, leading to short circuits, equipment damage, or catastrophic fire. The installer and end-user are responsible for ensuring the cables are deployed in accordance with this warning.; PDF page 27: ≥30cm; PDF page 27: ≥90°; PDF page 27: R≥6×D; PDF page 27: D'Needs confirmationThe prose requires vertical length greater than 30cm; the diagram prints ≥30cm, ≥90° and R≥6×D. Both contexts remain, with no absolute bend radius or reconciled bound computed. ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Internal Item K fastening is M5/6, 3~4N·m; it does not give external connector torque. External six-cable procedure, routing/coiling warnings and inverter-manual reference stay complete. Prose >30cm and diagram ≥30cm remain separately attributed. Location: PDF pages 23, 25, 27 High-Voltage Control Box and its connected CQ battery assembly. Internal Item K fastening is M5/6, 3~4N·m; it does not give external connector torque. External six-cable procedure, routing/coiling warnings and inverter-manual reference stay complete. Prose >30cm and diagram ≥30cm remain separately attributed. Location: PDF pages 23, 25, 27 |
| Power input | Not documented ConditionsNo separate electronics power-input supply rating is printed. Undirected operating-voltage and current measurements are retained under their own quantities. No separate electronics power-input supply rating is printed. Undirected operating-voltage and current measurements are retained under their own quantities. |
| Site requirements | PDF page 5: This manual is designed for qualified personnel only. The tasks described in this document should be performed by authorized and qualified technicians only.; PDF page 5: After Installation the Installer must explain the user manual to the end user.; PDF page 5: This manual is intended for use by qualified electricians only. All procedures described herein shall be performed by trained and experienced electrical personnel in compliance with basic electrical safety requirements.; PDF page 7: All operations, including transportation, installation, start-up and maintenance, must be performed by qualified and trained personnel.; PDF page 7: Do not energize the equipment without completing the installation or without professional confirmation, and strictly prohibit operation with electricity.; PDF page 7: Always use special insulated tools for wiring operations. Direct contact or contact with other conductors or indirect contact with the power supply equipment through wet objects is prohibited.; PDF page 7: During operation of the equipment, the enclosure temperature is high and there is a risk of burns. Before touching any part of the inverter, make sure that the equipment and its surfaces are at a contact-safe temperature and voltage before proceeding.; PDF page 8: Make sure that the inverter and battery is completely turned off before commencing installation.; PDF page 7: Do not expose battery to open flame.; PDF page 7: Store in a cool and dry place with ample ventilation.; PDF page 7: Do not store the product near water sources.; PDF page 7: Store the product on a flat surface.; PDF page 7: Recommend to store the product out of reach of children and animals.; PDF page 7: Do not damage the unit by dropping, deforming, impacting, cutting or penetrating with a sharp object. It may cause leakage of electrolyte or fire.; PDF page 7: Do not touch any liquid spilled from the product. There is a risk of electric shock or damage to skin.; PDF page 7: Always handle the battery wearing the insulated gloves.; PDF page 7: Do not step on the product or place any foreign objects on it. This can result in damage.; PDF page 7: Do not charge or discharge damaged battery.; PDF page 8: Warning: Do not use the battery if it has been dropped or appears compromised.; PDF page 9: Make sure the installation site meets the following conditions: Ensure the installation area is protected from direct sunlight, rain, and snow accumul ation, a shelter (e.g., rain canopy) is recommended. Keep the installation area away from high-temperature sources, flammable or explos ive materials, and other potential explosion hazards such as gas valves, LPG cylind ers, heat pumps, firewood stacks, etc. The installation area must be completely waterproof, with a hard, level floor, and the wall should not have noticeable inclined angle. Maintain low and stable humidity with good ventilation; dust and dirt within the install ation area must be minimized. Position the installation area away from television antennas or antenna cables to avo id lightning strikes and electromagnetic interference. Avoid the presence of flammable debris around the battery, such as cotton, fabric, ha ystacks, etc., which may be ignited by sparks and then lead the fire source to the battery, thus causing the battery to burn. Avoid the presence of hot or flammable objects around the battery, such as hydraulic bottles (natural gas, oxygen, etc.), heat pumps and so on.; PDF page 8: Do not install the equipment outdoors in salt-affected areas because it may be corroded. A salt-affected area refers to the region within 1000 m of the coast or prone to sea breeze.; PDF page 8: Please refrain from installing the battery near any water source to prevent accidental submersion.; PDF page 8: Recommend to install the battery away from children or pets.; PDF page 8: Do not use battery in high static environment where the protection device might be damaged.; PDF page 6: CE mark. The product complies with the relevant EU directives.; PDF page 6: Danger of high voltages. Danger to life due to high voltages in the inverter!; PDF page 6: Do not place nor install near flammable or explosive materials.; PDF page 6: Install the product out of reach of children.; PDF page 6: Prohibit the use of water to extinguish fires.; PDF page 6: Prohibition of private maintenance.; PDF page 6: Prohibit Connector Reversal.; PDF page 6: Read the manual before performing any operations on the inverter.; PDF page 6: Do not dispose of the product with household wastes.; PDF page 6: Disconnect the equipment before carrying out maintenance or repair.; PDF page 6: Observe precautions for handling electrostatic discharge sensitive devices.; PDF page 6: PE conductor terminal.; PDF page 6: Caution, risk of electric shock, energy storage timed discharge.; PDF page 21: 6mm Magnetic Phillips Screwdriver; PDF page 21: Crimpers; PDF page 21: Safety Shoes; PDF page 21: Multimeter; PDF page 21: Safety Gloves; PDF page 21: Safety Glasses; PDF page 21: Plier; PDF page 21: Cable Ties; PDF page 21: Hammer Drill @φ8mm; PDF page 21: Spirit Level; PDF page 21: Tape; PDF page 21: Marker; PDF page 24: Depending on the actual installation requirements, you can selectively remove the "Removable".; PDF page 25: Install the decorative covers of CQ16 and High-Voltage Control Box.Documented claim ConditionsHigh-Voltage Control Box and its connected CQ battery assembly. Source passages retain qualified-personnel, weather, handling and safety-symbol contexts. Printed CE is not independent certification or regional-sale proof. Some original safety rows say inverter, without reclassifying this product. Location: PDF pages 5, 6, 7, 8, 9, 21, 24, 25 High-Voltage Control Box and its connected CQ battery assembly. Source passages retain qualified-personnel, weather, handling and safety-symbol contexts. Printed CE is not independent certification or regional-sale proof. Some original safety rows say inverter, without reclassifying this product. Location: PDF pages 5, 6, 7, 8, 9, 21, 24, 25 |
| Storage temperature | -10 to 55 °C14 to 131 °F convertedDocumented claim ConditionsController own storage row; no module storage range is transferred. Location: PDF page 14, Storage temperature (°C); exact High-Voltage Control Box table Controller own storage row; no module storage range is transferred. Location: PDF page 14, Storage temperature (°C); exact High-Voltage Control Box table |
| Supported devices | Our system consists of at least 4 CQ16+ 1 High-Voltage Control Box and up to 15 CQ16+ 1 High-Voltage Control Box.Documented claim ConditionsPrinted requirement is CQ16 with one High-Voltage Control Box per system and at least 4 to at most 15 CQ16. No broader compatibility or separate sale is inferred. Location: PDF page 13, Product Introduction Printed requirement is CQ16 with one High-Voltage Control Box per system and at least 4 to at most 15 CQ16. No broader compatibility or separate sale is inferred. Location: PDF page 13, Product Introduction |
| Terminal torque (manual) | Not documented ConditionsNo numerical torque for external P+/P− connectors is printed. Internal assembly Item K torque is retained only with its connection context. Location: PDF pages 23 and 25 No numerical torque for external P+/P− connectors is printed. Internal assembly Item K torque is retained only with its connection context. Location: PDF pages 23 and 25 |
| Voltage range | 101 to 1000 VdcDocumented claimOperating voltage range 101~1000 Vdc, as printed. ConditionsUndirected operating voltage range as printed. It is not relabeled input, output, PV-input or battery nominal voltage. Location: PDF page 14, Operating voltage range (Vdc); exact High-Voltage Control Box table Undirected operating voltage range as printed. It is not relabeled input, output, PV-input or battery nominal voltage. Location: PDF page 14, Operating voltage range (Vdc); exact High-Voltage Control Box table |
| Weight | 29 kg64 lb convertedDocumented claim29 kg (±5%), as printed. ConditionsPrinted 29±5% for the controller, not the module or assembled-system weight. No tolerance bounds calculated. Location: PDF page 14, Weight (kg); exact High-Voltage Control Box table Printed 29±5% for the controller, not the module or assembled-system weight. No tolerance bounds calculated. Location: PDF page 14, Weight (kg); exact High-Voltage Control Box table |
Warranty
| Warranty term | Not documented ConditionsNo numeric warranty duration is printed in the reviewed sources; the manual describes warranty-period remedies and exclusions without stating a term. No numeric warranty duration is printed in the reviewed sources; the manual describes warranty-period remedies and exclusions without stating a term. |
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Certificate records
No records documented.
Sources and revisions
- Fox ESS CQ Series CQ16 / High-Voltage Control Box User Manual, V1.1.2Official user manual · Revision V1.1.2 · Checked https://www.fox-ess.com/Public/Uploads/uploadfile/files/20260812/ENCQ16ManualV1.1.2.pdf