Learjet wrote:
15 amp is no good in my opinion...you need minimum 20 amp with no other loads on the house circuit and no other loads on in the RV expect the converter with fully charged batteries.
The OP is here in Canada where 20 amp circuits aren't the norm as they are in the US. He hasn't told us
anything about his A/C unit but if it's a 13,500 BTU then as long as the source voltage is a nominal 120 vac, the cable run isn't excessive, and he uses his main service cable instead of a small gauge extension cable then he'll be able to successfully start and run that A/C just fine on a 15 amp circuit. As you yourself say -
"I do it all the time". ;) OTOH if his 5th has a 15,000 BTU A/C, or nominal voltage is significantly less than 120 vac, or he does use an excessively long, small gauge extension cable then his chances of success are much diminished. Without knowing these details which the OP hasn't told us it's impossible to answer his question accurately.