I had a GridBOSS and FlexBOSS21 installed with 3 14.3kWh outdoor batteries in May 2025. The system performed flawlessly as a backup power system, taking over during grid loss seamlessly. One little problem was that my electrician installed it with aluminum. Fast forward to today and recently had my GridBOSS reinstalled with copper and 14kW of PV installed.
I have had major issues since these two changes manifesting in several short 1-2 second power outages that occur several times a day. I have played with a lot of different software settings but have not been able to get rid of these outages. I am starting to wonder if some of my connections are not torqued to spec and that could be causing the issue. Or if I have a relay issue in the GridBOSS.
I am currently operating with only grid power and the FlexBoss's breaker in the off position. When I turn the FlexBoss breaker on, the power cycles from grid to the inverter and back again within minutes and with power outages each time.
I'm having a very difficult time getting hold of signature solar's support, lots of time on hold, which is a big change from a few weeks ago when I would get a tech on the phone within 30 seconds. So I am posting here 
