ksmithaz1

I ran a grid line thru a small breaker to only one inverter to synchronize the inverter to the grid, so if the transfer switch kicks...

Yes, that is how it should be connected but we have no verification that it was wired that way. As mentioned earlier the wires are not...

L1 from master inverter could be connected to L2 from the slave inverter at the Polaris connector. And L1 from slave to L2 master. The...

Oops, yep

If you have help and meter leads that are long enough, measure L1 to L1 and L2 to L2 (inverter to inverter), should read zero if wired...

Your drawing is right, now you need to confirm that the system is actually wired that way. Forget the professional electrician who...

Ok. I see a lot of black wires and polaris junctions in the panel. Get each and every conductor color coded so there is no out of phase...

Eggo even lost a bet on this thread.;)

Breakers pop for current, not voltage. 400v at 1 amp could fry 120v and 240v appliances.

Hmm, yea, the inverters don't have 'inputs' and 'outputs' PV, Bat +/-, GEN L1/L2, LOAD L1/L2, GRID L1/L2. The wiring box is nice and...

We (I) asked that several times. That would be the fastest and simplest way to eliminate parallel issues and/or to isolate the unit...

6-30 dryer outlet doesn't have a Neutral. I helped my son wire the pigtail about 8 months ago. 14-30 is common as well, but neutral...

A quick guess would be an out-of-range or sampling difference. I think there are articulation issues, but based on the OP and reading...

In your drawing you would seem to indicate L1/L2 AC "input" are swapped between the inverters. I'm assuming this is a Q&D drawing...

Yes, this is the "loop" some of us have speculated on and why I suggested turning one inverter off all together and try to replicate the...

I was also wondering if L1-> L2 and L2-> L1 between the inverters or something on the AC side. A "professional" would assume it's AC...

I do. Probably will add a third, Since about 2 or 3 firmware rev's ago last fall, they have been extremely stable. I am, however, not...

After checking the wires I noted in my prior post, first thing I would do is disconnect each inverter input at the Polaris connector and...

I still can't help but thinking this is some sort of issue with paralleling and them creating some sort of "loop". How about turning...

Not required for only two inverters (per support) a single is fine. The looped cabling is to maintain comms if one unit goes offline...