Downfalls for Solar Panels for Mini Split HVAC system?

Several people on this site have done it.     My installation took me about 10 hours but I wrapped the lines with extra insulation and was working without help.

Plan of upping your batteries and maybe your panels if you're going to run the mini-split several hours after sundown.
      
In my case (1600 sf fairly well insulated old farmhouse) with the thermostat set at 75 we found that with a 18,000 BTU, 21 seer, 2 head Panasonic unit the batteries take a beating if you leave it running 24/7 so for AC we turn ours on about 10:30 am and off at about 10pm (outdoor temps in the mid 80s until 11 pm some nights).      If it looks like it's going to be a cloudy day we'll delay cutting it on until early afternoon, the programmable remote helps with this.

Using the self clean mode allows the fan to run but not the compressor for an additional 30 minutes allowing you to capture every last bit of cooling effect with little battery drain or you can just leave it in fan mode for a breeze all night but we just use the ceiling fan for overnight cooling.

We've used the mini-split for heat (set at 65 degrees), it's not too bad on the batteries overnight on nights when it drops to 40 degrees outside  and we just don't want to run the woodstove.      Just for testing I used the mini-split overnight once when it was about 6 degrees outside.        It couldn't quite keep up and the house dropped to about 58 degrees inside and the batteries dipped to 65% SOC by 5:30 am.       Generally we'll use wood at night and maybe use the mini-split for heat from noon to early evening if needed.      There is a fair amount of thermal mass around the wood stoves and the bricks put out heat for several hours after the fires are out.