How many watts are the air conditioners?
An air conditioner, when it is starting, may draw up to ten times the normal number of watts. I suspect that 30 amps is a constant load--and that surges may be 50% greater for up to an hour--and in some cases triple that number for 10 seconds.
What did the old inverter have?
I prefer units without automatic functions, so I have no direct experience with AC transfer switches.
There would be no harm in using a higher rating if that makes you feel more comfortable. It may be considerably harder on your pocket book to do so.
QUOTE(06roadglide @ Mar 7 2010, 01:09 PM)
I am replacing my invertor in my RV. The unit recommended has a 30 amp AC transfer switch. I believe my 2 AC units pull 15 amp each. Am I limiting my ability to run both AC's as well as other electronics if I do no not choose a replacement unit with a 50 amp AC transfer switch? Side note: the recommended unit has 50 amp surge, but not sure if that is relavent?