My Magnum MS2812 is giving me problems with pass through AC power. I did have the coach generator on and was running two oil heaters and two heat lights on extension cords and no issues for several hours.
As you noted, this is a heavy load for a 30 amp system and an overload for a 23 amp system.
Heater 1 13 amps
Heater 2 13
Lamp 1 5?
Lamp 2 5?
Other loads ?
Total 36 amps
MS2812 (MS2812-G, MS2812-U)
Output Power 2,800W
Peak Watts 3,900W
Output Voltage 120 VAC
Output Current 23.3 amps
60 Amp transfer service (30 amps on each leg?)
In the morning I saw no AC power and the generator was putting out 0 amps. My ME-ARC50 was showing a red fault and was non functional. Fast forward it blew the 300 amp fuse between the generator and inverter, and kicked the 30 amp circuit breaker on the inverter.
The 300 amp fuse was probably a 12 volt DC fuse from the battery to the inverter. It is highly unlikely any circuits in the RV can handle 300 amps at 120 volts.
Guessing I overloaded the passthrough AC power in the inverter. Replaced the fuse , resat the breaker and still nothing from the inverter. Resat the inverter several times and the inverter AC power came on but still no passthrough power I wire nutted the input and output 120 lines and shore power and generator power works fine. Pulled the inverter and pulled the cover thinking it was a bad 30 amp breaker but that tests good. purchased this MS2812 10/13/17 so a few months off my 3 year warranty.
Is generator a 30 amp 120 volt unit?
Overloaded generator tripped its 30 amp 120 volt circuit breaker.
Inverter kicked in to replace the generator power.
Overloaded inverter should have tripped either input 12 volt or output 120 volt fuses and breakers.
I agree, fuses and circuit breakers should have protected the system.
I recommend you reduce loads a little when running the generator for heat.
I wish you good luck and happy trails ahead!