Hello, upgrade system from one MultiPlus-II 48/3000/35-32 230V to 3 with 3 Phases. Config no errors. After load Assistent ESS on Master show "low battery". Firmware is 2926 502. VE BUS reset to single. Same Problem after load Assistent ESS "low battery". Test on all 3 Multiplus same Problem single. best regards Karlheinz Weber