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OK. Kurt should be able to give you some pointers as to what to check.

Well... I've noticed on a few units that this is the first symptoms of the speed controller failing. As a test you can try to adjust the tuning pots on the controller and see if that does anything. I had one go down that road and the speed control became more and more erratic until it would...

If you ever want to upgrade the units you might consider one of the inverter based ACs. I can easily start mine with the 831. Its a 14kbtu 120v unit. Really energy efficient too! I run it in the summer time off the solar setup. It was a bit over $500.

What kind of AC units are they?

I jumper at the output lugs.

Yep, battery too drained. That is why I suggested disconnecting the battery and starting it. That will tell you right away if your charger is working. I don't even have batteries in my 831 right now. I just pull start it.

Disconnect the battery and pull start it. Does it run?

Everyone needs to know that the replacement pump is functionally identical but not mechanically identical. The fittings are 3/8" instead of 1/8". Adapters will have to be applied to make it work.

With the wiring you are describing its most likely the motors on the compressors. Edit: When I'm running in 115v mode on the 831 I also jumper L1 and L2 at the generator.

What is the wire size between the generator and loads? If you are running in 115v mode you'll need at least #10. If you have a pretty fast volt meter with a high/low capture feature you can capture the voltage range at the AC unit and at the generator during a compressor start and see if you...