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pianotuna wrote:
Hi ependydad,

I'm in a 30 amp class C.

I have a 30 amp male to 15 amp female adapter. I check the polarity. Then plug in a kill-a-watt meter. I plug an electric heater into the kill-a-watt. I let it run for a few minutes, monitoring the voltage.

I have a break out box for 50 amp--and can load both legs, measuring voltage on each.

If all is well, I plug in the RV. If voltage under load is low, I add the autoformer. I've never seen high voltage.

I don't find many folks here who are smarmy, most folks just want reliable information. Thanks for asking how I do voltage under load. I hope my answer is clear.

In the bad old days, when I did not have a hybrid inverter/charger, if voltage was low, I'd plug in only the converter. Then I'd plug the rest of the RV into the inverter. That would let me run the microwave, induction cooker, water heater, and air conditioner (one at a time--inverter was only 2500 watts). Of course the use was limited by the capacity of the battery bank--which at the time was 875 amp-hours @ 12 volts.

ependydad wrote:

pianotuna wrote:
I always check voltage under load before I plug in my RV.

I’m not being smarmy, but how do you check voltage under load without plugging in?