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No personal experience, but a device that combines a transformer and relay in one unit: https://www.amazon.com/dp/B00D5YLY2G?tag=atomicindus08-20 Use this with some 18/3 wire and whatever flavor of LV smart stat you desire. Edit: I see Denwood beat me to it.

That's where things get tricky - it all depends on your contract with the utility. Per my solar guy, while I could add to my system (if I found the space for more panels, which is also difficult), once I change from the utility approved design I would need to have a new and different contract...

No, I think the reset is either December or in the spring sometime. I don't carry over any credits because the household finds a way to kill all of those banked watts!

I have yet to carry over any banked credits past a one month period. I always tell people that, had I known the utility was going to limit my solar size based on past consumption, I would have run space heaters all over the place the year before getting solar.

Why is this? Force more air through in a specific direction?

WiFi camera doorbells need more power, so a swap out of the transformer lets you use the existing wiring.

I think this might work for your purposes if you want to use an LV thermostat for control: https://www.amazon.com/Aube-RC840T-240-Switching-Electric-Transformer/dp/B0037MXM1C?tag=atomicindus08-20

Is this with a newer air handler with a variable speed blower? If not, you are missing out - the air slowly builds up as the heat starts to be pumped in by the heat pump. While the air doesn't feel "hot" like a gas furnace, it's not like the ice blasts I remember growing up with heat pumps or...

A variable speed blower motor takes away the cold blast on spin up, making even a more conventional heat pump much easier to live with. The cost delta between an air conditioner and heat pump was not even 10% when I had a new one put in place 6-7 years ago. No way would I run on just heat...

You must have a heat pump, with electric strip backup? Sounds like the heat pump isn't keeping up.

Keep the outdoor inlet, but run it to a 30A receptacle next to the transfer switch. Install (yet another) inlet on the side of the transfer switch. When you want to run off the battery, use the indoor inlet. When you want to run off the generator, use a short extension cord between the...

Because the boiler/pumps/controls probably don't care if power is out for a few seconds, you can possibly just leave one of your battery units connected to it full time. During normal operation the AC power will pass through. When the power goes out, there will be a slight "blip' as the battery...

Correct, there are tons of products that monitor energy usage. But, if you are the type that has such a system in place, then what value does this type of Smart GFCI provide? If power monitoring isn't part of the Leviton product, I'm not seeing much value add for the end user beyond "is the...

This would work great for a sump pump, if you could get some real time data and historical data on the app on when the pump was running (and for how long).

You can get a small transfer switch just for this purpose. Random example: https://www.amazon.com/Kohree-Generator-Transfer-Predrilled-Switcher/dp/B0C379SNRY/?tag=atomicindus08-20

To counteract the thermostat cycling every time the garage door opened (which, in practice, the temp only shows dropping once the door closes and the air settles in the garage) I switched to a Nest thermostat. The Nest thermostat let me program all sorts of different time schedules to drop the...

Do you need to/want to shut off the water heater along with the pump? If not, you can use any number of relays and a low voltage smart thermostat to do what you want to do. Just cycle the pump as needed and keep the tank hot during your heating season. For my garage radiant heat I have a Nest...

Radiant in the floor? If so, I'm not sure I'd waste the time to move air around. For de-humidification purposes, if you keep the space warm enough for a dehumidifier to work, it should not be much of an issue.

The real question is - can you service the indoor unit without banging your head on the door hardware? That might drive a different location, even if it isn't the best for comfort or heat transfer.

As theoldwizard1 has said, no need for variable speed DC motors, the technology already exists to variable speed an AC one. EG4 (and I'm sure others) do offer a mini split heat pump that can be directly powered by solar panels...