If you've got to replace the converter, you might want to look at something like a Prosine 2 inverter. The Prosine puts out 2000 watts of true sine wave AC and up to 4500 watts for surges (ie: motor starting). It also puts out up to 100 amps at 12 volts for recharging the batteries and has a 30 amp power transfer switch built in. (You need two Prosines if you have 50 amp house wiring.)
They sell for about $1,600 new, but can sometimes be found on Craigslist for around $700-800.
I'm in the process of installing a Prosine 2 and three 120 AH AGM batteries into the space under one of the dinette benches in my Travel Trailer. Part of the project is also putting a Honda 2000 (2kw) inverter generator into a box on the back of the TT.
The generator won't start the compressor in the AC, but will run it. (Adding a soft-start cap is yet another project on the to-do list...) The idea is that the Prosine will automatically switch in to start the compressor and then switch back to the generator to run the AC.
Doug
K4AC
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