I get short-time power outage on all backup lines, roughly every 3 days, when there is no Grid outage and changeover CB's are on Grid side.
The outage normally recovers in a few minutes automatically.
Like tonight around 10pm, I experienced again electricity outage when only lights on. During the outage, all the non-backup lines were still working. 5 mins later, all lines worked again without any manual operation.
Inverter Info: Model: H3-10.0-Smart
Master: 1.36
Slave: 1.00
Manager: 1.23
AFCI: 0.35
Battery Info:EQ4800
Version_BMS: 2.007
Recently 7 day logs are screenshotted with Changeover CB position.