Manufacturer and seller images. Configuration examples may include additional equipment.
Image source: Fortress Power eFlex MAX 5.4, angled view on a plain background, from Fortress Power's own product page for this model.Paid link · price checked
Manufacturer document chemistry.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDocumented
Exact model column in the cited manufacturer document.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: PDF p1 specification tables
Documented
Exact model column in the cited manufacturer document.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: PDF p1 specification tables
Documented
Exact model column in the cited manufacturer document.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: PDF p1 specification tables
Documented
Rated energy measured at 0.5C. Maximum charge not relabeled continuous. Time-limited discharge is separate from continuous rating.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: PDF p1 specification tables
Documented
Installation manual: 125 A / 5 s. Standalone datasheet: 130 A / 5 s. Showing the manual limit; confirm the exact hardware revision with Fortress Power.
Installation manual p9. Standalone datasheet instead lists 130 A for 5 seconds.
Rated energy measured at0.5C. Maximum charge not relabeled continuous. Time-limited discharge is separate from continuous rating.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDocumented
The table prints Recommended Charge Current <55A. Section 9.8.1.3 gives a 60 A setting tied to the 10-year warranty, with its inverter-guide and Closed Loop condition. Both remain separately located, with no charging procedure chosen and no maximum derived. Its 100 A not-for-long-duration statement is not an unrestricted continuous rating.
Recommended Charge Current <55A, as printed. The bound is exclusive. The table names the recommended-current field; section 9.8.1.3 is a different conditional warranty-setting claim, retained beside it without selecting a charging procedure.
Different claim: a setting tied to the 10-year warranty, conditional on the inverter guidance and Closed Loop, not a replacement recommended-current table entry or a derived maximum. Full passage as printed: "The eFlex MAX can safely operate at 100A, but its maximum rating is not intended for long duration use. Unless otherwise specified through our inverter guides and battery is connected in Closed Loop, set the charge and discharge rates of the eFlex MAX at 60A to comply with the 10-year warranty. Any grid sellback or demand management function should also be limited to 60A per eFlex MAX. Limiting the charge rate of the eFlex MAX to 60A will result in the longest battery life. Precaution should be taken when adding charging sources which are not controlled by a single inverter or control system (Ex. using different manufacturer's DC charge controllers and inverters, solar + wind inverters, EV chargers etc.) to ensure the total system charges or discharges the battery within its specification. controllers do not charge the battery concurrently, when and if their combined charge current totals are greater than the charge current of the combined battery bank. Take additional extra precautions when using wind power to charge the battery, or if the inverter and charge controllers are not the same manufacturer."
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 9, Charge Specifications, Recommended Charge Current
Documented
Printed as "Without battery-inverter communication, eFlex MAX batteries should be charged at 54.4V" in the Fortress Power eFlex MAX: manual (page 31, sections 3.2 and 9.8.1.1). Applies without battery-inverter communication; with communication the published inverter guides may raise it.
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 31, sections 3.2 and 9.8.1.1
Documented
7 specs not documented yet: cell manufacturer, cell model, usable energy, continuous discharge current, continuous charge current, continuous output power, estimated throughputHelp fill in ›
Manufacturer document chemistry.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDocumented
Not documented
Not documented
Exact model column in the cited manufacturer document.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: PDF p1 specification tables
Documented
Not documented
Exact model column in the cited manufacturer document.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: PDF p1 specification tables
Documented
Exact model column in the cited manufacturer document.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: PDF p1 specification tables
Documented
Not documented
Not documented
Not documented
Rated energy measured at 0.5C. Maximum charge not relabeled continuous. Time-limited discharge is separate from continuous rating.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: PDF p1 specification tables
Documented
Installation manual: 125 A / 5 s. Standalone datasheet: 130 A / 5 s. Showing the manual limit; confirm the exact hardware revision with Fortress Power.
Installation manual p9. Standalone datasheet instead lists 130 A for 5 seconds.
Rated energy measured at0.5C. Maximum charge not relabeled continuous. Time-limited discharge is separate from continuous rating.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDocumented
The table prints Recommended Charge Current <55A. Section 9.8.1.3 gives a 60 A setting tied to the 10-year warranty, with its inverter-guide and Closed Loop condition. Both remain separately located, with no charging procedure chosen and no maximum derived. Its 100 A not-for-long-duration statement is not an unrestricted continuous rating.
Recommended Charge Current <55A, as printed. The bound is exclusive. The table names the recommended-current field; section 9.8.1.3 is a different conditional warranty-setting claim, retained beside it without selecting a charging procedure.
Different claim: a setting tied to the 10-year warranty, conditional on the inverter guidance and Closed Loop, not a replacement recommended-current table entry or a derived maximum. Full passage as printed: "The eFlex MAX can safely operate at 100A, but its maximum rating is not intended for long duration use. Unless otherwise specified through our inverter guides and battery is connected in Closed Loop, set the charge and discharge rates of the eFlex MAX at 60A to comply with the 10-year warranty. Any grid sellback or demand management function should also be limited to 60A per eFlex MAX. Limiting the charge rate of the eFlex MAX to 60A will result in the longest battery life. Precaution should be taken when adding charging sources which are not controlled by a single inverter or control system (Ex. using different manufacturer's DC charge controllers and inverters, solar + wind inverters, EV chargers etc.) to ensure the total system charges or discharges the battery within its specification. controllers do not charge the battery concurrently, when and if their combined charge current totals are greater than the charge current of the combined battery bank. Take additional extra precautions when using wind power to charge the battery, or if the inverter and charge controllers are not the same manufacturer."
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 9, Charge Specifications, Recommended Charge Current
Documented
Printed as "Without battery-inverter communication, eFlex MAX batteries should be charged at 54.4V" in the Fortress Power eFlex MAX: manual (page 31, sections 3.2 and 9.8.1.1). Applies without battery-inverter communication; with communication the published inverter guides may raise it.
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 31, sections 3.2 and 9.8.1.1
Documented
Printed as "Cycle Life 8,000 (@ 80% DoD)" in the Fortress Power eFlex MAX 5.4 datasheet, captured on September 25, 2026. No C-rate, temperature or end-of-life capacity is printed with it.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: Datasheet, Electrical Specifications, "Cycle Life" row
Documented
At 80% maximum DoD. 80% DoD: 25.6 MWh, 90% DoD: 14.4 MWh, 100% DoD: 10.7 MWh. Energy counting direction and AC/DC measurement boundary are unspecified; not discharge-only production.
Official warranty: Fortress Power eFlex MAX: warranty May 10, 2024 · CheckedLocation: Total Energy Throughput According to Maximum Depth of Discharge table
Documented
Published claims and calculations are not independently tested lifetime output.
Installation manual: 108 lb (49 kg). Standalone datasheet: 112 lb (51 kg). Showing the installation manual value; manufacturer clarification is pending.
Installation manual p9: 108 lb (49 kg).
Rated energy measured at0.5C. Maximum charge not relabeled continuous. Time-limited discharge is separate from continuous rating.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDocumented
Printed as "Dimensions: (L*W*H) 17.5 x 7.2 x 24.2inches 446 x 184 x 616 mm" in the Fortress Power eFlex MAX 5.4 datasheet, captured on September 25, 2026.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: Datasheet, Mechanical Specifications, "Dimensions: (L*W*H)" row
Calculated
Printed as "The Fortress eFlex MAX is an IP65 battery" in the Fortress Power eFlex MAX: manual (page 13, section 8, Installation).
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 13, section 8, Installation
Documented
Printed as "up to 16 eFlex MAX batteries can be connected in parallel" in the Fortress Power eFlex MAX: manual (page 27, section 9.3, Commissioning multiple eFlex MAX batteries in parallel).
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 27, section 9.3, Commissioning multiple eFlex MAX batteries in parallel
Documented
The section 3.5 chapter instruction, 0~35°C (32°F to 95°F), remains primary. The page 9 table prints 20~95°F (-6~35°C), retained as its own alternative. No unit conversion, rounding, issue-date ranking or hardware revision is inferred.
Printed as "temperatures ranging between 0°C and 35°C (32°F to 95°F)" in the Fortress Power eFlex MAX: manual (page 8, section 3.5, Storage).
Full co-printed table entry, retained in both printed units without conversion or rounding. Section 3.5 storage instructions on page 8 give a different lower bound and remain primary.
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 8, section 3.5, Storage
Documented
The table bounds do not override section 3.2. Its full freezing/near-freezing, current-reduction, lifetime-average temperature and cycle-life passages are retained in the conditions. No unrestricted operating claim or combined new temperature range is inferred.
Page 9 table prints 32°F~114°F (0°C~45°C). These table bounds do not establish unrestricted operation or full current throughout the range. Full page 7 section 3.2 passage, retained as printed without choosing an operating procedure: "CAUTION! Do not attempt to charge the battery below 32 degrees F (0 degrees C). Attempts to charge at subfreezing temperatures can adversely affect State of Health (SOH) and cycle life and will void the warranty; never charge battery if it is frozen; never charge a visibly damaged battery. Charging the battery near freezing should only be done with a low amperage external charger or closed-loop communication inverter unless the battery bank is heated. There is no need to heat the batteries above 50F. Do not charge the battery when the ambient temperature is freezing or below. Discharge current at sub-freezing temperatures should also be significantly reduced. Consider the Fortress DuraRack cabinet for din-rail friendly heater installation. CAUTION! Do Not Operate Fortress Lithium Batteries where average internal battery temperature exceeds 30 °C / 86 °F over the life of the battery. Recommended operating parameters of charger/Inverters For 3,000 Cycles: • Internal battery temperature range: 32 F to 120 F (0 °C to 49°C) without close-loop communication. • Bulk voltage and absorb voltage should be set to 54.4V if no battery-inverter communication is available. Recommended operating parameters of charger/Inverters For 8,000+ Cycles: • Operating temperature range: 50 F to 110 F (10°C to 43°C) per fortress power recommend charge and discharge inverter configuration."
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 9, Temperature Specifications, Charge Temperature; page 7 section 3.2
Documented
The table bounds do not override section 3.2. Its full freezing/near-freezing, current-reduction, lifetime-average temperature and cycle-life passages are retained in the conditions. No unrestricted operating claim or combined new temperature range is inferred.
Page 9 table prints -4°F~131°F (-20°C~55°C). These table bounds do not establish unrestricted operation or full current throughout the range. Full page 7 section 3.2 passage, retained as printed without choosing an operating procedure: "CAUTION! Do not attempt to charge the battery below 32 degrees F (0 degrees C). Attempts to charge at subfreezing temperatures can adversely affect State of Health (SOH) and cycle life and will void the warranty; never charge battery if it is frozen; never charge a visibly damaged battery. Charging the battery near freezing should only be done with a low amperage external charger or closed-loop communication inverter unless the battery bank is heated. There is no need to heat the batteries above 50F. Do not charge the battery when the ambient temperature is freezing or below. Discharge current at sub-freezing temperatures should also be significantly reduced. Consider the Fortress DuraRack cabinet for din-rail friendly heater installation. CAUTION! Do Not Operate Fortress Lithium Batteries where average internal battery temperature exceeds 30 °C / 86 °F over the life of the battery. Recommended operating parameters of charger/Inverters For 3,000 Cycles: • Internal battery temperature range: 32 F to 120 F (0 °C to 49°C) without close-loop communication. • Bulk voltage and absorb voltage should be set to 54.4V if no battery-inverter communication is available. Recommended operating parameters of charger/Inverters For 8,000+ Cycles: • Operating temperature range: 50 F to 110 F (10°C to 43°C) per fortress power recommend charge and discharge inverter configuration."
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 9, Temperature Specifications, Discharge Temperature; page 7 section 3.2
Documented
Printed as "Installers can choose a wall mount or floor mount for indoor and outdoor use" in the Fortress Power eFlex MAX: manual (page 13, section 8, Installation).
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 13, section 8, Installation
Documented
Charged Reviews classified this product from the documents it is based on. It is our own grouping, not a manufacturer claim.
Physical enclosure format; installation methods follow the exact manual.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedPrinted as "we recommend copper cable starting at 1/0 AWG for runs of less than 10ft" in the Fortress Power eFlex MAX: manual (page 13, section 7, Tools & Materials).
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 13, section 7, Tools & Materials
Documented
Printed as "The correct torque specification is 7.0 – 7.7 Nm" in the Fortress Power eFlex MAX: manual (page 15, section 8.2.1, Standalone Battery installation).
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 15, section 8.2.1, Standalone Battery installation
Documented
Limited to 60 minutes. This is not an unrestricted continuous rating. Manufacturer product page instead calls 100 A continuous. Follow the exact installation manual; the datasheet limits 100 A to 60 minutes.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · Checked Official product page: Fortress Power eFlex MAX: product page CheckedLocation: PDF p1 specification tables
Documented
Printed as Up to 100%. Section 9.8.1.5 separately says not to regularly discharge below 51V, 20% SoC; that capacity is reserved for power outages and idling until a charging source is applied. No 80% DoD or usable energy is derived. The cycle-life row is 8,000 at 80% DoD, a separate condition, not a substitute value.
Official instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedLocation: PDF page 9, Electrical Specifications, Depth of Discharge; page 32 section9.8.1.5
Documented
Rated energy measured at 0.5C. Maximum charge not relabeled continuous. Time-limited discharge is separate from continuous rating.
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedLocation: PDF p1 specification tables
Documented
Not documented
Published claims and calculations, not independent test results.
Datasheet system-level claim. Exact inverter/battery configuration and live issuer listing not independently checked.
Manufacturer document
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDatasheet fire-test claim; not UL 9540 listing.
Manufacturer document
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDatasheet transport claim.
Manufacturer document
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedPrinted document identifier EMDS 250702. No separately stated revision date; the identifier is not treated as an issue date.
Location: PDF p1 specification tables
Retrieved
SHA-256: 8419d3fa786beb0cc450a521fb135932c1dffa7212dcd0f95228e8c240ea475b
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/892/eflex-max/47923/fortress-power-eflex-max-data-sheet-english.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 8419d3fa786beb0cc450a521fb135932c1dffa7212dcd0f95228e8c240ea475b
Printed cover/footer revision; no separately stated issue date established.
Location: Reviewed primary document
Retrieved
SHA-256: dcfc3fe56cb68ec16e99254c6bb5dc720f8b6e954f918fd1642126c5de708b34
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/892/eflex-max/47927/fortress-power-eflex-max-installation-manual-english.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: dcfc3fe56cb68ec16e99254c6bb5dc720f8b6e954f918fd1642126c5de708b34
Location: PDF limited warranty coverage
Retrieved
Recorded document/effective date: May 10, 2024
SHA-256: 45e1849f1fc4762bba29252205440bfd856ada9c19929dfb815d3a8b062c0be6
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/892/eflex-max/47924/fortress-power-eflex-max-warranty-english.pdf. Copyright and takedown
Printed revision date: 2024-05-10
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 45e1849f1fc4762bba29252205440bfd856ada9c19929dfb815d3a8b062c0be6
Location: Reviewed primary document
Retrieved
SHA-256: 2297d7d4ab88ddb71383643e90f0d1d54478c3809850b4d6325896d97e89c328
Earlier revisions, archived captures and copies published by someone other than the manufacturer. Every one stays reachable.
Document group: datasheet. Attached by exact model or SKU naming in the document text.
Location: Linked from https://www.fortresspower.com/products/durarack-indoor-outdoor-enclosure/ with the link text "Fortress Power DuraRack + Flextower | Data Sheet"
Retrieved
PDF downloaded from a link published on the manufacturer's own site and preserved byte for byte. It establishes the document that link served on the access date. It is attached only to catalog rows whose exact documented SKU or exact model designation appears in this document's own text, so a document covering several models is attached to exactly those rows.
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/939/durarack/47871/fortress-power-durarack-flextower-data-sheet.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: ffc6e0b7597985397beb5537b1f3305140aae9875aa63a71541ebc6a61112fb3
Document group: datasheet. Attached by exact model or SKU naming in the document text.
Location: Linked from https://www.fortresspower.com/products/eflex-max-5-4kwh/ with the link text "Fortress Power eFlex MAX | Data Sheet (Spanish)"
Retrieved
PDF downloaded from a link published on the manufacturer's own site and preserved byte for byte. It establishes the document that link served on the access date. It is attached only to catalog rows whose exact documented SKU or exact model designation appears in this document's own text, so a document covering several models is attached to exactly those rows.
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/952/spanish/48054/fortress-power-eflex-max-data-sheet-spanish.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 52050ffb4d09b45d1401d14364b0f9ce561b3eb54aa2521cda3f2aa20920245a
Document group: manual. Attached by exact model or SKU naming in the document text.
Location: Linked from https://www.fortresspower.com/products/eflex-max-5-4kwh/ with the link text "Fortress Power eFlex MAX | Installation Manual (Spanish)"
Retrieved
PDF downloaded from a link published on the manufacturer's own site and preserved byte for byte. It establishes the document that link served on the access date. It is attached only to catalog rows whose exact documented SKU or exact model designation appears in this document's own text, so a document covering several models is attached to exactly those rows.
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/892/eflex-max/48358/fortress-power-eflex-max-installation-manual-spanish.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 1ec5f2ce4c39f68a88ff576a7bc87395f8b5d5b35cf19d31043cae0e8e1dc8bb
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/892/eflex-max/47923/fortress-power-eflex-max-data-sheet-english.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 8419d3fa786beb0cc450a521fb135932c1dffa7212dcd0f95228e8c240ea475b
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/892/eflex-max/47924/fortress-power-eflex-max-warranty-english.pdf. Copyright and takedown
Printed revision date: 2024-05-10
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 45e1849f1fc4762bba29252205440bfd856ada9c19929dfb815d3a8b062c0be6
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/892/eflex-max/47922/fortress-power-eflex-max-ul1973-atm-certification.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 0845d57575f530788aea59dcf5f366b47683586c4d6d8b4850a6bb6e5fd040ba
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/892/eflex-max/47927/fortress-power-eflex-max-installation-manual-english.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: dcfc3fe56cb68ec16e99254c6bb5dc720f8b6e954f918fd1642126c5de708b34
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/939/durarack/47871/fortress-power-durarack-flextower-data-sheet.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: ffc6e0b7597985397beb5537b1f3305140aae9875aa63a71541ebc6a61112fb3
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/952/spanish/48054/fortress-power-eflex-max-data-sheet-spanish.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 52050ffb4d09b45d1401d14364b0f9ce561b3eb54aa2521cda3f2aa20920245a
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/892/eflex-max/48358/fortress-power-eflex-max-installation-manual-spanish.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 1ec5f2ce4c39f68a88ff576a7bc87395f8b5d5b35cf19d31043cae0e8e1dc8bb
Archived copy of a document published by Fortress Power. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Fortress Power published. Original address: https://www.fortresspower.com/download/892/eflex-max/47925/fortress-power-eflex-max-ogpe-certification.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: f00ce035950ac4306251c6c69c56ceb8e9655fa212b0ffdd04e0dc60e5f8744c
Earlier of 10 years,8000cycles at 80% DoD or 3000cycles at 100% DoD; installer/registration/operating conditions apply. Different DoD throughput rows preserved.
Official warranty: Fortress Power eFlex MAX: warranty May 10, 2024 · CheckedLocation: PDF limited warranty coverage
Documented
At 80% maximum DoD. 80% DoD: 25.6 MWh, 90% DoD: 14.4 MWh, 100% DoD: 10.7 MWh. Energy counting direction and AC/DC measurement boundary are unspecified; not discharge-only production.
Official warranty: Fortress Power eFlex MAX: warranty May 10, 2024 · CheckedLocation: Total Energy Throughput According to Maximum Depth of Discharge table
Documented
Affiliate links below. Affiliate disclosure
Price for one unit, as listed by the seller. Does not include tax and shipping. Price checked .
The seller lists this as a new unit. Condition checked .
Distributor product page: SanTan Solar product page: Fortress Power eFlex Max 5.4KWH 105AH 48V Battery (captured October 15, 2026) Paid link.Checked · Earlier documentPrice for one unit, as listed by the seller. Does not include tax. Price checked .
The seller lists this as a new unit. Condition checked .
Distributor product page: Current Connected eFlex MAX battery offer (November 3, 2026 capture) Paid link.Checked · Earlier documentOfficial instruction manual: Fortress Power eFlex MAX: manual Rev EMM-WV251222 · CheckedPrices we read at Current Connected and SanTan Solar · 8 readings from to
Since · Listing price (USD)
A break in a line is a gap in our readings: no price is drawn for days we did not read.
| Checked (UTC) | Seller | Price |
|---|---|---|
| Nov 3, 2026, 3:28 PM PST | Current Connected Paid link. | $1,449 |
| Nov 7, 2026, 1:16 AM PST | Current Connected Paid link. | $1,449 |
| Nov 8, 2026, 1:16 AM PST | Current Connected Paid link. | $1,449 |
| Nov 9, 2026, 1:16 AM PST | Current Connected Paid link. | $1,449 |
| Nov 10, 2026, 1:06 AM PST | Current Connected Paid link. | $1,449 |
| Nov 11, 2026, 1:36 AM PST | Current Connected Paid link. | $1,449 |
| Nov 12, 2026, 1:25 AM PST | SanTan Solar Paid link. | $1,519 |
| Nov 12, 2026, 1:26 AM PST | Current Connected Paid link. | $1,449 |
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Own one? A verified review needs a receipt and a serial number photo, and counts 19× in the owner rating.
The Evidence score uses the priorities you choose. It counts published documents, such as certificates and warranty terms, and it compares a documented figure with the best documented figure of the same kind. It does not count owner reviews, and it is not a verdict on product quality or on how many people have reviewed it. A low score can mean little is documented, or that a documented figure is below the best of its kind. Undisclosed data scores 0.
Missing for this product: Cell model disclosure evidence needed.
48 V · Server rack · Rated capacity
The warranty term and the lifetime energy are each scored against the best documented value for a home storage battery: a value earns its share of that best, times the weight. A documented value always earns points; an undisclosed one earns 0.
100 evidence points · 45% weight
CEC listing: full credit for the certificate criterion. Exact model found in the dated CEC equipment list. This is not a safety certification or system approval. Applies: CEC; UL 9540; UL 1973.
100 / 100 × 45 = 45 points.
Issuer record: CEC Battery List, official spreadsheet (data unchanged since October 1, 2026; downloaded October 11, 2026) October 1, 2026 · Checked · Earlier document10 years · 20% weight
10 of 20 years, the best documented for a home storage battery (printed by the maker): Bioenno Power 6V 3Ah LiFePO4 Battery (PVC, BLF-0603W)
Earlier of 10 years,8000cycles at 80% DoD or 3000cycles at 100% DoD; installer/registration/operating conditions apply. Different DoD throughput rows preserved.
50 / 100 × 20 = 10 points.
Official warranty: Fortress Power eFlex MAX: warranty May 10, 2024 · Checked100 evidence points · 10% weight
Explicit energy commitment in a reviewed manufacturer warranty; application and coverage conditions apply.
100 / 100 × 10 = 10 points.
Official warranty: Fortress Power eFlex MAX: warranty May 10, 2024 · Checked4.76 MWh/kWh · 20% weight
This is the best documented for a home storage battery warranty energy limit, calculated from maker figures.
Warranty limit: 25.6 MWh ÷ 5.374 nominal kWh. Operating conditions still apply.
100 / 100 × 20 = 20 points.
Official warranty: Fortress Power eFlex MAX: warranty May 10, 2024 · Checked Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedNot documented, 0 points: Cell model disclosure.
Computed from public specifications and evidence records. Warranty duration is not service quality; certificate evidence points are not a safety rating. Compatibility and installation limits still apply.
UL 1973: CEC reported · pack check pending
Datasheet system-level claim. Exact inverter/battery configuration and live issuer listing not independently checked.
Models: eFlex MAX 5.4
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDatasheet fire-test claim; not UL 9540 listing.
Models: eFlex MAX 5.4
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDatasheet transport claim.
Models: eFlex MAX 5.4
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedFinished Lithium Iron Phosphate Battery. Manufacturer-hosted copy; exact installed configuration and issuer status require confirmation. Standard edition: ANSI/CAN/UL1973:2022 Ed3. Issued 2024-06-27.
Models: eFlex MAX 5.4
Report: 240322062GZC-001
Official certificate: Fortress Power eFlex MAX: certificate CheckedListed on the California Energy Commission Battery List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Fortress Power LLC "eFlex Max 5.4": UL 1973, certifying entity Intertek, certificate date 2024-06-27, Ed. 3 : 2022, CEC listing date 2024-10-01. A state equipment list entry, not the certification body's own record.
Models: eFlex MAX 5.4
Issuer record: CEC Battery List, official spreadsheet (data unchanged since October 1, 2026; downloaded October 11, 2026) October 1, 2026 · Checked · Earlier documentModel eFlex MAX 5.4 listed on the California Energy Commission Battery List (data unchanged since October 1, 2026; downloaded October 11, 2026) under Fortress Power LLC, as "eFlex Max 5.4", CEC listing date 2024-10-01. The list prints "eFlex Max 5.4"; the record's model "eFlex MAX 5.4" differs only in letter case. This is an equipment listing, not UL certification or complete-system approval.
Models: eFlex MAX 5.4
Issuer record: CEC Battery List, official spreadsheet (data unchanged since October 1, 2026; downloaded October 11, 2026) October 1, 2026 · Checked · Earlier documentDatasheet system-level claim. Exact inverter/battery configuration and live issuer listing not independently checked.
Manufacturer document
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDatasheet fire-test claim; not UL 9540 listing.
Manufacturer document
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedDatasheet transport claim.
Manufacturer document
Official datasheet: Fortress Power eFlex MAX: datasheet Rev EMDS 250702 · CheckedNo sourced accessories or replacement parts listed yet.
Manufacturer SKU unknown · US market
Product / system scope unresolved. Listed on the California Energy Commission Battery List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Fortress Power LLC "eFlex Max 5.4": UL 1973, certifying entity Intertek, certificate date 2024-06-27, Ed. 3 : 2022, CEC listing date 2024-10-01. A state equipment list entry, not the certification body's own record.
Issuer record: CEC Battery List, official spreadsheet (data unchanged since October 1, 2026; downloaded October 11, 2026) October 1, 2026 · Checked · Earlier documentProduct / system scope unresolved. Model eFlex MAX 5.4 listed on the California Energy Commission Battery List (data unchanged since October 1, 2026; downloaded October 11, 2026) under Fortress Power LLC, as "eFlex Max 5.4", CEC listing date 2024-10-01. The list prints "eFlex Max 5.4"; the record's model "eFlex MAX 5.4" differs only in letter case. This is an equipment listing, not UL certification or complete-system approval.
Issuer record: CEC Battery List, official spreadsheet (data unchanged since October 1, 2026; downloaded October 11, 2026) October 1, 2026 · Checked · Earlier documentNo discussions linked yet. Search DIY Solar Forum
No recalls or legal notices on file; this is not a complete recall or court search. All notices · Report a notice
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Prices · price basis. * Calculated; estimates labeled. Value needs confirmation; select it for the reason.
