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I get 76% for the few months I've had solar assistant recording data. Sol-Ark 15k + HomeGrid Stack'd 38.4kWh. I've come to understand that the Sol-Ark is significantly less efficient when it is both inverting and charging, so changed my TOU settings to limit the time where it's doing both. Will...

:) You can write the priority in either direction. Preventing bunches of inverters from going offline during _high or low_ voltage/frequency events will both protect the grid and reduce nuisance disconnects.

Which grid mode is your 15k in? IIRC the UL1741SB included increased requirements around inverter ride-through to prevent nuisance disconnects (and in the process protect the grid).

You're right on code. To make it all safe in practice, in addition to the interlocked mechanical backdraft prevention damper, you would also need sufficient make-up air to keep the house pressure from going negative. Would end up costing more energy than a separate garage minispit or similar...

Attached or detached garage? If attached, you could add an exhaust vent and a temperature controlled fan+damper to bring in just enough cool air from the house. I'm in a much cooler climate and didn't want the garage to get too hot, so installed a temperature controlled exhaust and passive...

A single turn through something like this will put 100 ohms or so of impedance at the frequencies of concern. Potentially sufficient.

Hmm, what band is your QRN on? Others have reported 20m/15MHz, in which case I'd expect the radiator to be on the lines to the roof (battery cables should be way too short). Some snap-on ferrites with 1-2 turns on the solar panel wires might reduce it. I put some on those lines prophylactically...

Nice! On the other forum I linked, some folks got a software update with a "low noise mode" for their SunSynks. I suspect that mode has some other trade-off, so prefer my solution of filtering the one problem circuit.

Radiated RF is a totally different issue that I haven't started working on yet. Could be from the inverter itself, or more likely a resonant length of wire attached to it. Some common mode choking via ferrites may help, but finding exactly which wire is the problem will be a project.

Hopefully this helps some of the folks who have reported 15kHz noise problems with their Sol-Ark (/Deye/SunSynk) inverters. I've had mine running for about a month now, and it's located in the garage directly below my pantry (where the microwave is located). My wife and kids have been reporting...