Quote:
Originally Posted by Bob Denman
Thanks: just had to check.. 
But now i have to wonder how microwave and air conditioner power usages may differ...  |
For what it’s worth, air conditioners have improved in efficiency far more than microwaves as far as I can tell, so relative power usage has changed over the years.
When I tested my Class C, both the 13,500 A/C and microwave pulled around 13+ Amps (more or less). That’s around 1,500 Watts each.
Microwaves today still require around 1.5 Watts of electric power for each Watt of cooking power rating, so a typical 1,000-Watt microwave uses around 1,500 Watts of power.
Older air conditioners, particularly 15,000 BTU/hour sizes, often required close to 2,000 Watts and even more in desert conditions. Those large and inefficient units plus a microwave could easily trip 30A on a hot day. It’s simple math.
By comparison, modern air conditioners, particularly the 13,500 BTU/hr size, can be more efficient than years ago and require much less power; and much less than many microwaves.
Attached is claimed efficiency specs for 13,500 Power Saver. Two of those on a 30A service leaves plenty of spare capacity for smaller loads.
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