AC without pre-wire?

allcool wrote:

SpencerRB wrote:

I believe he has 50 amp on the trailer. He was adding a 20 or 30amp separate circuit for the 3rd A/C separate from the trailer electrical.

You do bring up an interesting point. From my understanding, 50amp service is actually rated at 240v, so at 120v, it is rated at 100amps. If this is the case, why do 50amp trailers need load management devices to handle 45 amps (3 15k) of A/C units? This should be less than half of total capacity.

Not exactly...
Its 25amps at 240v and 50amp at 120v.
100amps at 120v would be 12,000 watts, not happening on a Onan5500, ever.

If you measure between both legs of 120v it will be 240v on the 5500 genny. Either 240v leg measured to neutral or ground, gives 120v.
Thats why there are 2, 30 amp breakers, one for each 120v leg of the 240 being produced by the genset. Each leg is good for a little less than 25amps @120v, more or less. So thats how it gets a rating of 50amps, 2 separate 25amp 120v circuits. Actual specs, its 45.8 amps, so in reality, each 120v leg is rated for 22.9amps constant draw...

Make no mistake, 5500 watts is 5500 watts, no matter what voltage. 5500w, thats all we get out of the Onan 5500. Although a surge to 6000watts momentarily will happen.

Let's clear up the confusion: A 50A RV circuit is 240/120V 50A and the 50A rating applies to 240V. This 4 wire circuit can supply 240V @50A or 120V @ 50A on each hot leg or any combination of 240V and 120V as long as the current on each hot legs does not exceed 50A. Few RVs use 240V so we tend to think of it as 2 circuits of 50A each. And the CB is a dual 50A CB. So 50x240=2*50*120=12K Watts available on this circuit.

Don't know how we got into gens but generally you don't get 240/120V from an Onan under 10K watts. Instead they are 2 120V circuits.