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If you haven't had the chance to run your solar system through a full winter yet, my advice would be to do nothing and see where you land on actual production. I have a spreadsheet where I track daily/monthly production and, let me tell ya, the winter months can be BRUTAL for actual watts...

I don't have any of my own, but family members that do use UFOs all tend to wire them the same. That is - plug them in and leave the dimming wires alone. So maybe a low cost option that doesn't have the dimming capability?

There is a company that makes a geothermal style small system to supplement heating/cooling. https://wellconnectgeo.com/ From what I understand, it is rather expensive. Cheaper than a full blown geothermal system where you have to drill wells or trenches, but still a lot of money. Maybe...

Radiant floor heat? Or something else? Is the addition a garage? Or living space?

Where are the outside units going? East? North?

https://batteryuniversity.com/article/bu-808-how-to-prolong-lithium-based-batteries

From what little I understand about lithium/LiFePO4 batteries - that battery type likes to live between 20% and 80%. So wouldn't using an AGM charger that doesn't get high enough voltage for a full charge actually extend the life of the battery?

If you have the more common UFO fixtures, do they have dimming capabilities? Maybe the better solution is to turn them all on and dim as needed?

Jumper Y to R at the thermostat. Or at the air handler.

Does the contactor (the relay that turns on the compressor and outside fan) in the outside unit function correctly?

What do you mean when you say it runs normal when you pull the Y off both the outside unit and the thermostat - that it actually runs both the inside fan and the outside fan/compressor? Is the coil going bad in the outside contactor?

Almost any of the bigger (5kW-10kW) electric garage heaters can be converted to an external smart thermostat using an Aube relay: https://www.amazon.com/Aube-RC840T-240-Switching-Electric-Transformer/dp/B0037MXM1C?tag=atomicindus08-20 For a temp/cheap setup, a few space heaters on separate...

Bit more $, but here's a similar "saddle" style that is also an inverter: https://www.amazon.com/dp/B0BVGJ1Q4G?tag=atomicindus08-20

Most of the smart thermostats will tell you total runtime. It would be easy to figure out % of total by taking runtime x ratings on the unit and subtract from your monthly bill. When I installed my first Nest thermostat (when they first launched and you had to pre-order it), there were big...

Are you sure it doesn't have programming? I don't use the 2 wire communication setup on my Vision Pro, but it is REDLink compatible. After I added the gateway device (plugs into your router via Ethernet), I was able to setup the wake up/day/return/sleep schedules in the app...

Is there a "G" terminal on the control board? If so, did someone put a jumper on it?

Model# of each component? I'm sure thermostat wiring is buried in the installation manuals.

Here is a SPDT relay I have used in the past for 120VAC circuits: https://www.amazon.com/American-Zettler-Power-120VAC-AZ2280-1C-120A/dp/B07587NZTC?tag=atomicindus08-20

What’s the harm if there is no delay? Is the 12VDC pump also on a float switch?

Between the flashy website with very little technical depth and the fact that they appear to be relying on "someone else" to pay for the device, it all seems very scammy. I don't doubt that the device and the connected app can and will track voltage over time, and that has some very real...