Disclaimer - not an engineer - terminology may be off.

Our power was out for about 20 hours yesterday. A few hours in I hooked my generators up to the panel. Went through the normal process, flipped breaker main off, flipped off big breakers (HVAC, stove, oven, dryer, water heater), turned units on, flipped generator feed breaker on. Did the same thing a few months ago and everything that I expected to work worked. Yesterday, only about half of my breakers seemed to work. Once utility power came back on, everything is working again.

I have Westinghouse igen2500 and igen4500. The manual say they parallel just fine together. Westinghouse parallel cable, and an RV plug into the panel - feeds the whole panel, I turn off the main and the big breakers. This setup should power every outlet, light, fan, and my mini split.

I called Westinghouse support today and explained the problem. They said it likely sounded like a control board or an inverter within the units moreso than an issue with my cables or panel - one of the units is likely only providing one phase of power.

They suggested I troubleshoot by starting each unit independently, let idle for a few minutes, and then turn on a couple of items that pull a good amount of power and see which of the units wouldn't ramp up or down. For each, I plugged in an air compressor, and the generator ramped up. With the compressor still running, I plugged in a shop vac. Both ramped up more. I then turned them off in reverse, and the units both ramped down to idle as I'd expect.

This seems inconclusive - both seem to be working as expected independently. Before calling Westinghouse back - anything else to try, or other expert opinions?

The breakers which didn't work - where are they in relation to one another? Did your dryer, HVAC, etc larger loads work?

My larger (double sized?) breakers stay flipped off while powering panel from the generator. I don't think the setup has the amps for any of those.

Kind of random. My garage door opener & lights wouldn't work, and that breaker is between front porch and master bedroom plugs (breakers in panel, vertically) which did. Microwave worked, but kitchen fridge and family room lights which are on either side of it didn't.

<a href="https://ibb.co/p6ntpsBN"><img src="" alt="IMG-20250507-225520" border="0"></a>

I meant the breakers in relation to other breakers. If every other pair doesn't work, you dropped a leg. 1 and 2 should be on one leg. Then 3 and 4 on the other, and so forth.

Check your breakers on your generator. I'm wondering if your breaker tripped on the control board there. Same issue happened to me and that was the cause.

I'm pretty sure that setup will only output 120v, not 240.