This is to let everyone know of a bug in firmware... Main CPU version 69.05 and secondary firmware 12.21. When charging off solar only, everything appears to work correctly. The same is true when charging off the grid power. The problem is when trying to charge off both AC grid and solar at the same time. What happens is everything works correctly if AC grid power is first applied and then solar power, both sources charge the batteries. However when solar is first applied and then AC grid, only solar is charging the batteries. This is the bug in firmware. The settings in my inverters are.... Program Setting 01 01 or USb 02 80A 05 05 or USE 11 20A 16 16 SNU 26 57.6V 27 54.1V I am using 4 of the 5.14 KW OP solar batteries in parallel,
Depend on the priority of the energy you want to use, parameter 01 you can set as :
USB
Utility will provide power to the loads as first priority. Solar and battery energy will provide power to the loads only when utility power is not available.
SUB
SBU