Hi,
it is 1x 24v module built in BMS LifePo4 with a multimeter on it I can see the battery is on and does not get disconnected, The Synapse settings I set to factory defaults and the battery icon appears on the inverter display the on/off switch is indeed confusing I tried it in both ways in and out but as soon as I disconnect utility power the Inverter goes off. IT worked well with the gel batteries but only lasted 40min hence the reason I replaced the gel batteries with the Lithium battery