I'm using a Multiplus 12/3000/120 in a boat. It's attached to a 920Ah lead acid bank. Settings are stock except for battery type ( Flooded deep discharge flat plate antimony) and shore limit (43A) When disconnected from shore and the generator (Kohler 11kW) running the Cerbo shows grid power available. I wait 2 mins and turn on a water heaters (12A) and everything works as I expect. I then turn on one AC (12A compressor) and the Cerbo shows the grid power disappear and switch to inverting; which then of course overloads the Multiplus. I have boost enabled and have not seen this happen at the dock (50 A shore power, shore limit set to 48A). These loads are all running through the Multiplus (this is a 120V/240V 50A split phase and all L1 loads run through the Multi)
When the above is happening on L1, I also have the following loads on L2 (not through the Multi) - 12A water heater, 10A AC pump and 12A compressor.
I wonder if the generator is dropping out (why else would the, mutli lose grid?) but it's brand new and should support 45A on L1 and 45A on L2. It could be the extra draw on the AC unit's starting, but I thought that the Multiplus would draw from the batteries to help in this situation - it does this perfectly at the dock.
Any thoughts welcome!
Steve.