Electrical problem..Magnatec converter?

Bubba Bill wrote:
Perplexing problem, Damon Intruder now in storage shed. Plugged in shed outlet, ran small electric heater for 4 to 5 days, no problem. Turned heater off, no 110 or 12 volt devices running. Went back several days later, all batteries drained to about 9v. Engine, gen would not turn over, 12v lighting very dim. 110v outlet GFI breaker thrown. Every time I try to reset outside GFI, trips. If I turn all inside breakers off, except main, breaker stays on. 'Receptacle' breaker seems to throw shorepower breaker every time, suggesting short. However, I've had this problem before. My question is: If batteries run down below a certain voltage, is there such a draw on the converter/charger that it would exceed 20 or 30 amps? Since I rent the storage barn, I don't know what the GFI outlet is rated at. I can plug my battery charger in to charge batteries without tripping the GFI. Not sure what my problem is! We wintered for 3 months down South with no problems. BIll

The problem is with the batterys so low the AMP draw from converter
far outdraws the shore power source.Charge up the batterys with a charger first.Another thing to do is set PM at 10 amps. GFI are a pain when u get in this situation.I usually turn off all the breaker feeds except the one I need to run the charger section of the inverter.Running a 120V heater and Inverter/converter off a 20 amp SP
is hard to do effectively and its hard on the transfer switch if power runs low and breaker does not trip it will cause stress on the ATS(chatters)