Manufacturer and seller images. Configuration examples may include additional equipment.
Image source: EG4 FlexBOSS18 front view published by EG4 Electronics on its own product page for SKU EG4INVFLXBOSS18.Paid link · price checked
EG4's own FlexBOSS18 page (captured November 1, 2026) prints "MODEL #: IV-13000-HYB-AW-*" and "SKU: EG4INVFLXBOSS18V1" in its identity block and links the spec sheet and user manual this record cites. Revised on November 1, 2026: Lead Engineer ruling 2026-11-01 19:31Z: EG4 documents no unsuffixed or other FlexBOSS18 revision (its spec sheet v1.0.9 and manual v1.1.3 print one model, IV-13000-HYB-AW-FX-XX), so the maker's own printed code becomes the manufacturer SKU and the distributor code stays on the record.
Official product page: EG4 FlexBOSS18, EG4 product page (November 1, 2026 capture) Checked · Earlier documentLocation: Product page identity block, SKU line
Documented
Part number shown by distributor; exact hardware revision should be checked on the label. Kept as an alternative on November 1, 2026: the distributor code this record held; EG4 prints EG4INVFLXBOSS18V1 for the same product.
Distributor product page: Current Connected product listing Paid link.CheckedProvisional evidence
Model-specific manufacturer datasheet.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Printed as "PEAK POWER 20000W (.5 sec) | 15000W (1 sec) | 13500W (1 min) | 12500W (6 min) 11000W (12 min)" in the EG4 FlexBOSS18 spec sheet v1.0.9, captured on September 25, 2026.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedLocation: Spec sheet, AC OUT, "PEAK POWER" row
Documented
Model-specific manufacturer datasheet.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Model-specific manufacturer datasheet.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedCalculated
Printed as "MAX. EFFICIENCY: PV TO GRID/LOAD 97%" in the EG4 FlexBOSS18 spec sheet v1.0.9, captured on September 25, 2026. The same block prints CEC weighted 97%, battery to grid/load 94%, PV to battery 94.5% and AC to battery 94%. Manufacturer rating; no test conditions are given.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedLocation: Spec sheet, EFFICIENCY block, "MAX. EFFICIENCY: PV TO GRID/LOAD" row
Documented
Usable or recommended array power, not AC output. String voltage/current limits also apply.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Printed as "PEAK POWER 20000W (.5 sec) | 15000W (1 sec) | 13500W (1 min) | 12500W (6 min) 11000W (12 min)" in the EG4 FlexBOSS18 spec sheet v1.0.9, captured on September 25, 2026.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedLocation: Spec sheet, AC OUT, "PEAK POWER" row
Documented
Model-specific manufacturer datasheet.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Printed as "MAX. EFFICIENCY: PV TO GRID/LOAD 97%" in the EG4 FlexBOSS18 spec sheet v1.0.9, captured on September 25, 2026. The same block prints CEC weighted 97%, battery to grid/load 94%, PV to battery 94.5% and AC to battery 94%. Manufacturer rating; no test conditions are given.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedLocation: Spec sheet, EFFICIENCY block, "MAX. EFFICIENCY: PV TO GRID/LOAD" row
Documented
Printed as "NOMINAL OUTPUT VOLTAGE 120/240 or 208 VAC (L1/L2/N required)" in the EG4 FlexBOSS18 spec sheet v1.0.9, captured on September 25, 2026.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedLocation: Spec sheet, AC OUT, "NOMINAL OUTPUT VOLTAGE" row
Documented
Printed as "BATTERY NOMINAL VOLTAGE 51.2 VDC" in EG4 FlexBOSS18 user manual v1.1.3, Technical specifications, Battery data. Revised on 1 October 2026: The manual and datasheet print the battery nominal voltage as 51.2 VDC; the "48V" wording is a product description, not a nominal voltage rating.
Official instruction manual: EG4 FlexBOSS18 user manual v1.1.3 Rev 1.1.3 · Checked · Earlier documentLocation: Technical specifications, Battery data
Documented
Model-specific manufacturer datasheet.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Maximum with PV contribution; see battery-only output.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Usable or recommended array power, not AC output. String voltage/current limits also apply.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Absolute voltage limit. Recommended design maximum can be lower; use the current manual and cold-weather string calculation.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Model-specific manufacturer datasheet.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Model-specific manufacturer datasheet.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedCalculated
Model-specific manufacturer datasheet.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Printed as "2 4 1/0 AWG (53.5mm2) 340A 16 ft. Max. 230 in-lbs. (26Nm) 250A ..." in the EG4 FlexBOSS18 Hybrid Inverter User Manual, battery cable table, captured on September 26, 2026.
Official instruction manual: EG4 FlexBOSS18 user manual v1.1.3 Rev 1.1.3 · Checked · Earlier documentLocation: Battery cable table
Documented
Printed as "Grid 90A 2 AWG (50 mm2) 93 in-lbs. (10.5 Nm)" in the EG4 FlexBOSS18 Hybrid Inverter User Manual, AC connections table, captured on September 26, 2026.
Official instruction manual: EG4 FlexBOSS18 user manual v1.1.3 Rev 1.1.3 · Checked · Earlier documentLocation: AC connections table
Documented
Model-specific manufacturer datasheet.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Printed as "230 in-lbs. (26Nm)" in the EG4 FlexBOSS18 Hybrid Inverter User Manual, battery cable table, captured on September 26, 2026. Battery terminal torque.
Official instruction manual: EG4 FlexBOSS18 user manual v1.1.3 Rev 1.1.3 · Checked · Earlier documentLocation: Battery cable table
Documented
Printed as "Load 90A 2 AWG (50 mm2) 93 in-lbs. (10.5 Nm)" in the EG4 FlexBOSS18 Hybrid Inverter User Manual, AC connections table, captured on September 26, 2026.
Official instruction manual: EG4 FlexBOSS18 user manual v1.1.3 Rev 1.1.3 · Checked · Earlier documentLocation: AC connections table
Documented
Published claims and calculations, not independent test results.
Manufacturer document claim for the named equipment. Issuer listing, exact revision and current status have not been independently checked. This is not a complete installed-system approval.
Manufacturer document
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedManufacturer specification, not an independent test.
Location: Printed model column and specification table
Retrieved
SHA-256: af3d395a94a970c40b4072f95e46f84a987edac277db60657d20ca0c414cb022
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedArchived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2024/12/EG4-FlexBOSS18-Hybrid-Inverter-Spec-Sheet.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: af3d395a94a970c40b4072f95e46f84a987edac277db60657d20ca0c414cb022
Document group: manual. Exact SKU named in document text: not found.
Location: Linked from https://eg4electronics.com/categories/inverters/eg4-flexboss18/ with the link text "EG4 FlexBOSS18 Hybrid Inverter – User Manual (Spanish) v1.0.8"
Retrieved
PDF downloaded from the link the manufacturer publishes on its own product page for this model and preserved byte for byte. It establishes the document that link served on the access date; the document's text was read but does not repeat this exact SKU, so it is recorded as the document the manufacturer links for this product rather than as a per-SKU document. No revision history, issuer verification or continued availability of the link is established.
Official product page: EG4 Electronics product page: EG4® FlexBOSS18 - EG4 Electronics Checked · Earlier documentArchived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/04/EG4-FlexBOSS18-User-Manual-Spanish.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: accaa54c4aad97391be01e9d8481a3e117f66688bbe97bd2af5f129691fa8fea
Linked from the Current Connected product page with link text "Warranty".
Location: EG4-FlexBOSS18-Hybrid-Inverter-Warranty.pdf
Retrieved
Original PDF preserved byte for byte, found linked from the Current Connected listing https://www.currentconnected.com/product/eg4invflxboss18v1. The revision is whatever was published at this URL on the access date; exact variant coverage inside the document was not separately verified and no later revision was checked.
SHA-256: 1f93b448d98263408cb1a2057482dacbbac84ffe163ec667e49a2d06f48f23a4
Archived copy of a document published by eg4electronics.com. 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 eg4electronics.com published. Original address: https://eg4electronics.com/wp-content/uploads/2025/02/EG4-FlexBOSS18-Hybrid-Inverter-Warranty.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 1f93b448d98263408cb1a2057482dacbbac84ffe163ec667e49a2d06f48f23a4
Distributor listing. Manufacturer or issuer confirmation is separate.
Location: Product identity and specifications
Retrieved
SHA-256: a0b259c5449954a0d3a73bfd0a4a47112568022e21c64a44de6e8f80dddcbce5
Distributor product page: Current Connected product listing Paid link.CheckedEarlier revisions, archived captures and copies published by someone other than the manufacturer. Every one stays reachable.
Document group: datasheet. Exact SKU named in document text: not found.
Location: Linked from https://eg4electronics.com/categories/inverters/eg4-flexboss18/ with the link text "EG4 FlexBOSS18 Hybrid Inverter – Spec Sheet (Spanish) v1.0.5"
Retrieved
PDF downloaded from the link the manufacturer publishes on its own product page for this model and preserved byte for byte. It establishes the document that link served on the access date; the document's text was read but does not repeat this exact SKU, so it is recorded as the document the manufacturer links for this product rather than as a per-SKU document. No revision history, issuer verification or continued availability of the link is established.
Official product page: EG4 Electronics product page: EG4® FlexBOSS18 - EG4 Electronics Checked · Earlier documentArchived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/04/EG4-FlexBOSS18-Spec-Sheet-Spanish.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 2e1d3eab6c64a1291910f19545539b6cae368a34225d82c58099597fdd9d7734
Linked from the Current Connected product page with link text "Manual".
Location: EG4-FlexBOSS18-Hybrid-Inverter-User-Manual.pdf
Retrieved
Original PDF preserved byte for byte, found linked from the Current Connected listing https://www.currentconnected.com/product/eg4invflxboss18v1. The revision is whatever was published at this URL on the access date; exact variant coverage inside the document was not separately verified and no later revision was checked.
SHA-256: 48fd3cbb6a21f9660105005eeba941d2756298cd9f96c8fdbc5027886dffcaf6
Archived copy of a document published by eg4electronics.com. 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 eg4electronics.com published. Original address: https://eg4electronics.com/wp-content/uploads/2024/12/EG4-FlexBOSS18-Hybrid-Inverter-User-Manual.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 48fd3cbb6a21f9660105005eeba941d2756298cd9f96c8fdbc5027886dffcaf6
Archived copy captured on 2026-11-01.
Location: Identity block (MODEL # and SKU lines); Documentation list
Retrieved
EG4's own page, captured on November 1, 2026 with the paced research fetcher (HTTP 200, eg4electronics.com not blocked). Read for the identity block (model and SKU lines) and the documents it lists; manufacturer statements, not independent tests.
Matched to the catalog record because the manufacturer's documented SKU for this product appears on this page and on no other page captured from this site.
Location: Page title: EG4® FlexBOSS18 - EG4 Electronics
Retrieved
Manufacturer-operated product page, captured byte for byte with a plain HTTPS GET and a desktop user agent. It establishes what the manufacturer published at this URL on the access date for this exact model: the specification table it shows, the page photo and the documents it links. Values rendered only by client-side scripts are not part of the capture. Marketing text, certification wording and stock state remain manufacturer claims that were not independently verified, and nothing on it was applied to any other model.
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2024/12/EG4-FlexBOSS18-Hybrid-Inverter-Spec-Sheet.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: af3d395a94a970c40b4072f95e46f84a987edac277db60657d20ca0c414cb022
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2024/12/EG4-FlexBOSS18-Hybrid-Inverter-User-Manual.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 48fd3cbb6a21f9660105005eeba941d2756298cd9f96c8fdbc5027886dffcaf6
Archived copy of a document published by eg4electronics.com. 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 eg4electronics.com published. Original address: https://eg4electronics.com/wp-content/uploads/2025/08/EG4-FlexBOSS18-WallMount-Indoor-280Ah-INDOOR-ESS-%E2%80%93-UL-9540-Certificate-of-Compliance.pdf?utm_medium=email&_hsenc=p2ANqtz-81Mgqf-sYlCKTcFdK4jMNzc306KCLWJJA-IE6gEkBulGX_eFNPHlwW3z6rlLrFXhaZXN_DLXc2o5WXIo-7PJtux2IlaMOa8yfKTOIOgmniJtpTgdg&_hsmi=375095875&utm_content=375095875&utm_source=hs_email. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 7106a515efc1564738754c3dcd98a0ddae5bd30f7df0aa5c05ae0efc0b109995
Archived copy of a document published by eg4electronics.com. 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 eg4electronics.com published. Original address: https://eg4electronics.com/wp-content/uploads/2025/02/EG4-FlexBOSS18-Hybrid-Inverter-Warranty.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 1f93b448d98263408cb1a2057482dacbbac84ffe163ec667e49a2d06f48f23a4
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/04/EG4-FlexBOSS18-User-Manual-Spanish.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: accaa54c4aad97391be01e9d8481a3e117f66688bbe97bd2af5f129691fa8fea
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/04/EG4-FlexBOSS18-Spec-Sheet-Spanish.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 2e1d3eab6c64a1291910f19545539b6cae368a34225d82c58099597fdd9d7734
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/10/EG4-UL-9540-ESS-Model-Number-Explanation-Hybrids-with-All-Weather-Indoor-WallMount.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 9710b53a50bd057e57badf0c594df3977a1e80b3d18048c3a950ddb711d2b319
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/08/Busbar-PCS-Explained.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: ab33ecf2e74b31387fc74f72150a150673a93dbdb5b2d6750a5afb880e5a1d6c
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/07/EG4-Hybrid-Inverters-Manufacturers-Statement-for-Anti-Islanding-Methods.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 4e4206191267b5128ac869efd61447035640c9566091391e4190f4ed7b4032db
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/03/EG4-NEC-Code-Compliance-for-AC-DC-Disconnects.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 4073ae2899b001e4c7fbdc39f2ec97fd08734018110d9b3cc2086582d8d2a7cd
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/03/EG4-FlexBOSS18-UL-1741-Certificate-of-Compliance.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 98b1f5a628e754aceae4d2ca3fcbb46bec4f1fdd5250300147686e575efedc6f
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/08/EG4-FlexBOSS21-FlexBOSS18-UL-3141-CRD-PCS-Verification-of-Conformity.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: c091f1ff4364cf5d06876470ff9229c47ad7c301553de7f4d1798501971556ac
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/08/EG4-FlexBOSS18-WALLMOUNT-ALL-WEATHER-ESS-–-UL-9540-CERTIFICATE-OF-COMPLIANCE.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: eecf515761aff73db2b868e0bf26b74a506853b7edcaf821a0a98f901b8653cd
Archived copy of a document published by EG4 Electronics. 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 EG4 Electronics published. Original address: https://eg4electronics.com/wp-content/uploads/2025/12/EG4-FlexBOSS21-FlexBOSS18-WallMount-314Ah-Indoor-Battery-ESS-–-UL-9540-Certificate-of-Compliance.pdf. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: ea8b85d0521639b68cb4ecc810a3e8e3a4efed502982e012f755fd6b0fef9dad
Datasheet headline; registration, operating limits and full contract terms apply.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedDocumented
Affiliate links below. Affiliate disclosure
Price for one unit, as listed by the seller. Does not include tax, shipping and installation. Price checked .
The seller lists this as a new unit. Condition checked .
Distributor product page: EG4 FlexBOSS18 48V Hybrid All-In-One Inverter, 10kW AC Output, 18kW Solar Input, NEMA 4X, UL 1741 & UL 9540 (www.currentconnected.com, October 3, 2026 capture) Paid link.Checked · Earlier documentChecked · End date not published.
Signature Solar promotion terms Paid link.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 .
Minimum order: 1 units. Checked .
Distributor product page: EG4 FlexBOSS18 13kW AC Hybrid Inverter (signaturesolar.com, October 4, 2026 capture) Paid link.Checked · Earlier documentDistributor product page: EG4 FlexBOSS18 13kW AC Hybrid Inverter (signaturesolar.com, November 2, 2026 capture) Paid link.Checked · Earlier documentPrice 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: BigBattery store catalog row for SKU INV031: EG4 FlexBOSS18 Hybrid Solar Inverter | 18kW PV / 13kW AC | Split-Phase | 2-MPPT | Scalable | Remote Wi-Fi Monitoring (MiMo capture bigbattery.json, captured 2026-10-27T15:39:27Z) CheckedPrice for one unit, as listed by the seller. Does not include shipping. Price was not recorded for this listing. Price checked .
The seller lists this as a new unit. Condition checked .
Distributor product page: ShopSolar product data for EG4 FlexBOSS18 13kW AC Hybrid Inverter (shopsolarkits.com, October 28, 2026 capture) Paid link.Checked · Earlier documentDistributor product page: ShopSolar product page for EG4 FlexBOSS18 13kW AC Hybrid Inverter (shopsolarkits.com, October 28, 2026 capture) Paid link.Checked · Earlier documentPrices we read at 4 stores · 77 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 |
|---|---|---|
| Sep 20, 2026, 7:52 AM PDT | Current Connected Paid link. | $3,099.99 |
| Sep 23, 2026, 4:51 AM PDT | Current Connected Paid link. | $3,099.99 |
| Sep 25, 2026, 2:00 AM PDT | Current Connected Paid link. | $3,099.99 |
| Sep 26, 2026, 2:32 AM PDT | Current Connected Paid link. | $3,099.99 |
| Sep 27, 2026, 3:32 AM PDT | Current Connected Paid link. | $3,099.99 |
| Sep 28, 2026, 4:32 AM PDT | Current Connected Paid link. | $3,099.99 |
| Sep 29, 2026, 3:54 PM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 1, 2026, 1:06 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 2, 2026, 1:06 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 3, 2026, 1:06 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 3, 2026, 11:54 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 4, 2026, 1:06 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 4, 2026, 9:17 AM PDT | Signature Solar Paid link. | $3,199.99 |
| Oct 5, 2026, 1:05 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 6, 2026, 1:05 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 7, 2026, 1:15 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 8, 2026, 1:05 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 9, 2026, 1:25 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 10, 2026, 1:46 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 11, 2026, 1:05 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 12, 2026, 1:26 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 13, 2026, 1:15 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 14, 2026, 1:25 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 15, 2026, 1:06 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 16, 2026, 1:05 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 17, 2026, 1:15 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 18, 2026, 1:05 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 19, 2026, 1:45 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 20, 2026, 1:36 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 21, 2026, 1:36 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 22, 2026, 1:16 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 23, 2026, 2:09 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 24, 2026, 1:06 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 24, 2026, 3:03 AM PDT | Signature Solar Paid link. | $3,199.99 |
| Oct 25, 2026, 1:06 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 26, 2026, 1:07 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 27, 2026, 1:06 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 27, 2026, 2:53 AM PDT | Signature Solar Paid link. | $3,199.99 |
| Oct 27, 2026, 8:39 AM PDT | BigBattery Paid link. | $3,199.99 |
| Oct 27, 2026, 9:08 PM PDT | ShopSolar Paid link. | $3,209 |
| Oct 28, 2026, 1:26 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 28, 2026, 1:26 AM PDT | ShopSolar Paid link. | $3,209 |
| Oct 28, 2026, 3:23 AM PDT | Signature Solar Paid link. | $3,199.99 |
| Oct 29, 2026, 1:16 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 29, 2026, 1:16 AM PDT | ShopSolar Paid link. | $3,209 |
| Oct 29, 2026, 3:46 AM PDT | Signature Solar Paid link. | $3,199.99 |
| Oct 30, 2026, 1:26 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 30, 2026, 1:26 AM PDT | ShopSolar Paid link. | $3,209 |
| Oct 30, 2026, 3:50 AM PDT | Signature Solar Paid link. | $3,199.99 |
| Oct 31, 2026, 1:26 AM PDT | Current Connected Paid link. | $3,099.99 |
| Oct 31, 2026, 1:27 AM PDT | ShopSolar Paid link. | $3,209 |
| Oct 31, 2026, 3:34 AM PDT | Signature Solar Paid link. | $3,199.99 |
| Nov 1, 2026, 1:06 AM PDT | Current Connected Paid link. | $3,099.99 |
| Nov 1, 2026, 3:46 AM PST | Signature Solar Paid link. | $3,199.99 |
| Nov 2, 2026, 1:36 AM PST | Current Connected Paid link. | $3,099.99 |
| Nov 2, 2026, 4:07 AM PST | Signature Solar Paid link. | $3,199.99 |
| Nov 2, 2026, 9:19 AM PST | Signature Solar Paid link. | $3,199.99 |
| Nov 3, 2026, 1:06 AM PST | Current Connected Paid link. | $3,199.99 |
| Nov 3, 2026, 1:06 AM PST | ShopSolar Paid link. | $3,209 |
| Nov 3, 2026, 4:22 AM PST | Signature Solar Paid link. | $3,199.99 |
| Nov 4, 2026, 1:06 AM PST | Current Connected Paid link. | $3,199.99 |
| Nov 4, 2026, 1:06 AM PST | ShopSolar Paid link. | $3,209 |
| Nov 5, 2026, 1:06 AM PST | Current Connected Paid link. | $3,199.99 |
| Nov 5, 2026, 2:12 AM PST | Signature Solar Paid link. | $3,199.99 |
| Nov 5, 2026, 3:42 AM PST | ShopSolar Paid link. | $3,209 |
| Nov 6, 2026, 1:06 AM PST | Current Connected Paid link. | $3,199.99 |
| Nov 6, 2026, 1:07 AM PST | ShopSolar Paid link. | $3,209 |
| Nov 7, 2026, 1:16 AM PST | Current Connected Paid link. | $3,199.99 |
| Nov 7, 2026, 1:17 AM PST | ShopSolar Paid link. | $3,209 |
| Nov 7, 2026, 3:16 AM PST | Signature Solar Paid link. | $3,199.99 |
| Nov 8, 2026, 1:16 AM PST | Current Connected Paid link. | $3,199.99 |
| Nov 8, 2026, 1:16 AM PST | ShopSolar Paid link. | $3,209 |
| Nov 9, 2026, 1:16 AM PST | Current Connected Paid link. | $3,199.99 |
| Nov 10, 2026, 1:06 AM PST | Current Connected Paid link. | $3,199.99 |
| Nov 11, 2026, 1:36 AM PST | Current Connected Paid link. | $3,199.99 |
| Nov 11, 2026, 2:13 AM PST | Signature Solar Paid link. | $3,199.99 |
| Nov 12, 2026, 1:26 AM PST | ShopSolar Paid link. | $3,209 |
Recent reviews count from the latest approved revision. Verified reviews carry 19× the weight. Select a period to filter.
Showing 1 of 1 reviews
The Flexboss18 has been powering my 2000 sq. ft. house constantly for 10 months as of October 2026. I have 13kW of panels connected to it and 32kWh of RUiXU Lithi-2 batteries. It is grid connected through a GridBoss. Every setup is unique and YMMV. The hardware has been very reliable. The software is another story. It's difficult to tell with the EG4 web/app interface how the system (including a GridBoss) will react with a given configuration and situation. It can also be very slow to get updated readings (minutes). The mfg. documentation is lacking in explaining how the different combinations of settings will work together. It requires a lot of trial and error. Once you figure out the behavior of the system with a given set of settings, the hardware will hold the settings and behavior reliably 99% of the time. In their web software, there are features that tech support admitted were not ready for primetime. Specifically, "Weather Optimize" is one such feature. There is a lot of ambition behind the features exposed for the hardware. It would be amazing if it was easy to use and understand and if it all worked as expected. In my opinion, QA for their software is lacking. I've used tech support one time. They were quick to respond and helpful in examining the issue (why is my system using grid power when it shouldn't be?), but ultimately could not say why it was happening and "fixed" it be clearing all settings and reapplying. There is no way to easily do that same operation in their software. You'd have to enter all settings in again manually after clearing them. Some of the software hiccups may not apply to you if you don't have a GridBoss, as much of the complexity lives in the interaction between it, the Flexboss18, the batteries, and the grid. The wifi dongles are a weak point. Range is not great and there is no option for an external antenna. Seems like an oversight given the amount of metal the dongle is near in its location on the side of the inverter. The dongles also do not allow you to disable the wide-open bluetooth. Anyone could pull up next to your house, connect to bluetooth, and control your system. The monitoring/config website does not have MFA as of 10/2026. This is incredibly concerning given the ability for it to reach into your house and control your power. I do not recommend this EG4 inverter and ecosystem unless you are an expert user willing to spend a lot of time to understand and troubleshoot the setup. You may also want to consider the weak hardware and software security. The system can be made to be secure without losing a lot of functionality, but you will need additional hardware and you'll have to effectively build your own software automation.
Delivery: On time
Great experience with the company so far across several transactions. Tech Support is very good.
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 details. This number counts only the evidence recorded so far. The source review for this product is not finished, or the maker has not disclosed enough, so the number can only go up.
Missing for this product: Battery conversion efficiency needed; Idle consumption needed.
Each input is scored against the best documented value for an inverter: warranty term and battery conversion efficiency against every published inverter, idle consumption (lower is better) against the inverters in the same output band, or against every published inverter when the output is not documented. A documented value always earns points; an undisclosed one earns 0 and is listed as missing. Researched products receive a score. Certificates earn points for the evidence itself. Size and weight do not affect scores.
Manufacturer claim; issuer verification pending. Applies to the exact inverter.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · Checked10 of 25 years, the best documented for an inverter (printed by the maker): APsystems DS3
Datasheet headline; registration, operating limits and full contract terms apply.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedResearch pending, 0 points: Battery conversion efficiency, Idle consumption.
Warranty term and battery conversion efficiency are compared with every published inverter; idle consumption with the inverters in the same 7 to 15 kW output band. · Method version 0.5
How it worksManufacturer document claim for the named equipment. Issuer listing, exact revision and current status have not been independently checked. This is not a complete installed-system approval.
Models: EG4INVFLXBOSS18
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedManufacturer document claim for the named equipment. Issuer listing, exact revision and current status have not been independently checked. This is not a complete installed-system approval.
Manufacturer document
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedNo sourced accessories or replacement parts listed yet.
The name EG4 Electronics gives this product in its own spec sheet (version 1.0.9), page 1, opening description (the cover prints "MODEL#: IV-13000-HYB-AW-FX-XX" above the title "EG4® FLEXBOSS 18 HYBRID INVERTER"): "The FlexBOSS18 also features a 90A grid bypass capability". EG4 prints this name for this one product only; the catalog has no other version of it under this name (PM, 2026-10-27).
Official datasheet: Spec Sheet Checked · Earlier documentThe distributor code this record held as its SKU (Current Connected listing); EG4's own page prints EG4INVFLXBOSS18V1, the manufacturer SKU since November 1, 2026 (Lead Engineer ruling 2026-11-01 19:31Z).
Distributor product page: Current Connected product listing Paid link.CheckedManufacturer SKU EG4INVFLXBOSS18V1 · US market
Product / system scope unresolved. Manufacturer document claim for the named equipment. Issuer listing, exact revision and current status have not been independently checked. This is not a complete installed-system approval.
Official datasheet: EG4 FlexBOSS18 datasheet Rev 1.0.9 · CheckedNo 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
Something wrong that is not one of the values above?
Prices · price basis. * Calculated; estimates labeled. Value needs confirmation; select it for the reason.
