Hi Paw Paw,
I do heat 100% electrically and have tested down to -36 c (-33 f). It takes about 18500 BTU's (peak demand 5400 watts or 45 amps) to do so. Those are impossible numbers for a single 30 amp circuit. That is why I added additional shore power cordage.
I am often in locations that have no 30 amp, nor 50 amp supply, but do have multiple 15 amp discreet circuits available.
I have added 20 amp and 15 amp shore power cords to the OEM 30. This allows me to use up to 45 amps of power for heating in the winter time. In the summer time I use the 15 amp to run the converter, and the 20 amp to run the water heater. That leaves me with 15 amps on the OEM shore power any time there are multiple circuits available to me.
On the OEM 30 amp, when plugged into 15 amps, because I have a hybrid inverter I can use the battery bank to supplement power to 30 amps using the "load support" feature on the inverter. Of course, I can not do it "forever" but it does make starting hi draw appliances such as the air conditioner and microwave safe to do without risking "brown out" damage to them.
Paw Paw John wrote:
As for Pianotuna if I read his post correctly he is using one 30 amp shore power and two 15 / 20 amp extension cords at the same time. Why!!!