SolarPairing / Works, closed loop
EG4 12kPV / 18kPV / FlexBOSS18 / FlexBOSS21 × Fortress Power eFlex 5.4 / eFlex MAX 5.4 / eVault MAX 18.5
Fortress Power's inverter compatibility documentation lists eFlex 5.4, eFlex MAX 5.4 and eVault MAX 18.5 with EG4 12kPV, 18kPV, FlexBOSS18 and FlexBOSS21 systems in supported battery communication configurations. The exact protocol and cable depend on the named equipment and software release. Confirm the individual EG4 model, regional hardware, battery firmware, selected CAN or RS485 profile and the latest Fortress compatibility page before commissioning.
Status
Works, closed loop
Protocol
CAN / RS485
Last verified
2026-10-02
01 / About this pairing
Fortress Power's inverter compatibility documentation lists eFlex 5.4, eFlex MAX 5.4 and eVault MAX 18.5 with EG4 12kPV, 18kPV, FlexBOSS18 and FlexBOSS21 systems in supported battery communication configurations. The exact protocol and cable depend on the named equipment and software release. Confirm the individual EG4 model, regional hardware, battery firmware, selected CAN or RS485 profile and the latest Fortress compatibility page before commissioning.
02 / Source
https://www.fortresspower.com/dealers/inverter-compatibility/