Quote:
Originally Posted by Time2roll
We are renovating an old 34' class A motorhome. We have it plugged in to shore power at our home (husband installed a 50amp breaker and plug receptacle).
We are in AZ having 116F temps! The rig has 2 AC units but we are leery to run both while still running our home AC. We haven't yet installed our hardwired EMS.
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With a 120/240V feeder to your coach, presumably each A/C unit is on its own leg (L1 and L2 from the main panel). So each one is pulling something like 15A or so. Your home A/C, depending on number and size, might be drawing 40A or more from both L1 and L2, since it/they’re 240V units. The two coach units add to that. But that’s still way under 100A on each leg, and 100A is small for a residence service size in the last 50 years, which is more likely 150-200A anyway.
Or put another way, adding 3600VA to a system capable of 24,000-48,000VA is not likely to be a problem, but if it worries you, don’t run the clothes dryer at the same time (~5000VA - more than both RV A/C’s combined).
Quote:
Originally Posted by Time2roll
Soooo.. the question is whether it is advised to open and run our roof vent fan (in the main area of the rig) while also running the AC. Is this counterproductive? The AC has been running since morning but the inside rig temp (at 3:30pm) is reading 104F.
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As someone said, if you’re blowing inside air out through the roof, other air has to come in through the cracks and windows, and if that air that’s coming in is 116F, you’ll be shoveling sand against the tide. Seal it up, shield it from the sun the best you can, and put a fan inside to move air around. That’s all you can do.
Oh, you could also add a portable A/C unit, which will have to be vented out a window, but I see folks here posting about using them with pretty good success, so that’s an option. And I still wouldn’t worry about the power draw.