SolarPairing / Works, closed loop
SMA Sunny Island 4548-US / 6048-US × Fortress Power eFlex 5.4
Fortress Power's SMA Sunny Island integration guide documents eFlex 5.4 with Sunny Island 4548-US and 6048-US systems using closed-loop CAN communication. The guide sets out the required battery interface and commissioning configuration for this specific low-voltage pairing. Confirm the Sunny Island firmware, eFlex 5.4 revision, BMS cable, battery bank layout and all current SMA and Fortress installation requirements before energizing the system.
Status
Works, closed loop
Protocol
CAN
Last verified
2026-10-02
01 / About this pairing
Fortress Power's SMA Sunny Island integration guide documents eFlex 5.4 with Sunny Island 4548-US and 6048-US systems using closed-loop CAN communication. The guide sets out the required battery interface and commissioning configuration for this specific low-voltage pairing. Confirm the Sunny Island firmware, eFlex 5.4 revision, BMS cable, battery bank layout and all current SMA and Fortress installation requirements before energizing the system.
02 / Source
https://www.fortresspower.com/wp-content/uploads/2019/11/Fortress-Battery-Integration-Guide-with-SMA-Sunny-Island.pdf