Hell, theoretically you could take that Tritium user terminal and connect it direct to 1000V solar arrays. Software in the dc converter would have to be modified to support MPPT but it can be done. This would make fully offgrid batteryless solution. With added PV ground isolation monitoring...
How about one of these all-in-one inverters? https://www.mppsolar.com/v3/hv6048wp/
There is a thread about it here: https://diysolarforum.com/threads/new-all-in-one-mpp-lvx6048wp-ul-certified.23505/
Looks good. 20kWh of storage should carry 350w of loads for 3 days during cloudy weather. I would add auto starting generator and chargeverter. The only thing I don't like are those batteries not reporting SOC for telemetry.
Inspired by that design here are my literally back of envelope doodles. The idea to use cheap pipe or rebar driven into ground vertically as support with custom made brackets which can be made for a $1 each.
You should get 600V DC rated MOVs for PV- to ground and whatever is your PV voltage + 100V for PV+ to ground and PV+ to PV-. Would need 3 per side or 6 total. I prefer MOVs with built-in gas discharge tube but GMOV only goes up to 415VDC which is not enough.
Got it talking with BMSTest software. So It looks like you can't edit voltage setpoints with these BMS boards. Kinda lame but understandable since these batteries supposed to be safe from user tampering.
So it only glows when neutral is connected (blue). Seems like capacitive coupling from neutral to concrete ceiling. Set your multimeter to AC voltage and measure from LED fixture metal case to neutral. Scrape off a bit of paint to make contact. Start with highest voltage setting and work your...