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After rereading the post, it looks like it is 12V. A 1500W load at 12V would require inverter supply wire ampacity of 174A. That's calculated as 1500/12/inverter efficiency, so assuming 90%, 1500/12/.9 = 139A. NEC requires wire of 125% of that ampacity, so 139 * 1.25 = 174A. If a free air...

Happy to help out! Good luck with the project. Feel free to PM me if you have more questions.

Have you thought about 2-2-4 urd aluminum. Its around $2.60/ft. Don't bring it up into any building and seriously consider putting it in conduit.

What type of wire are you using, aka, THHN, RHW, etc?

Wire sizes are a little small given that NEC requires a 1.25% adjustment - but if you don't care about code compliance and or won't be inspected, the 2/0 "should" be OK. I'm assuming wire in conduit, not free air. All but 1 installation I've seen in the last 20 years or so wouldn't be...

I have 12 batteries, arranged in 2 rows of six. I typically see a 8 degree F difference in battery temperature between the 2 rows with the upper being warmer.

Something is wrong with the 490V and 27.8A values. That's 13.62kW which greatly exceeds the 9kW of panels.

Looks like Matt found the issue!

I agree URD is direct burial, but over the years I have seen many direct burial cables fail because of nicks in the insulation. This is catastrophic when the conductors are aluminum. Can be damaged when installed, damaged from frost heave of sharp rocks, etc. Not to mention that a lot of folks...

And Ejimenez!!

Finally had time to review the panel specs! You can run two strings of 8 panels into one PV input on each inverter, even given the -35F temperature! The PV input voltage limit is 500V. The 8 panels in series will exhibit an open circuit voltage of 466.5V at -35F. That would take you down to a...

Yea, it consumes 100w. The heat dissipation is interesting. My system has the batteries co-located with the inverters in a small 6'X8' shed, insulated to R11 in the walls, R32 "ish" in the ceiling, and no insulation in the floor. It sits on deck blocks, so it has around 12" of ground...

Sure, it is allowed, I just specify it be in pipe. Just a personal preference.

Also, the required fuse will most likely not be a standard value, so pick the next larger standard value fuse if reasonable.

Is the inverter shutting down or are the battery BMSs shutting down?

Yea, everything else looks fine. PM me when tou get closer to building it. There are a lot of "gotchas" that pop up and I will be happy to help out further.

Correct on the UL stuff, unless you can find it listed as a recognized wire type, like RHW, etc. A close cousin is DLO cable, which is RHH/RHW but it is more expensive. here's a linkhttps://1xtechnologies.com/dlo-cable/

It will take care of individual cell voltage imbalances but can't fix current imbalances resulting when the inverter is pulling large currents, aka powering a large load.

Both firmwares report U1 as 79.03 and U2 as 61.06. I have an open ticket on the issue. Tech support suggested I upgrade the firmware and am waiting on the cable to do so. BTW, the fault 71 issue is resolved as soon as I uplug the RS485 cable. Atleast at that point, I can restart both inverters...

What type of batteries are in your system?

The authority having jurisdiction may have requirements in excess of whatever NEC has been adopted. I haven't seen the design you reference but there are a LOT of nuances in requirements. You may want an electrician experienced with solar to check the design. Are you certain you are subject to...

From the specs, it looks like you're using welding cable (RHW) or maybe DLO cable. I agree with Shimmy. Assume you have 75C terminations, so provide over current protection of 310A. That would allow a maximum inverter consumption of about 250A. You didn't mention inverter capacity or voltage...