@eric I have 4 EG4 LifePower4 batteries (48V@100amp) It could be the battery type. I'll have to double check the manual before I change this settin...

@eric So what does a person do who has a dongle with older firmware? Surely these can be upgraded? Mine starts with "BC"... so I would guess thats...

I have two PV arrays and a battery bank of 4 EG4 batteries. As you can see from the monitor history, it did previously note "W016: No AC Connection"...