It is not so much that they cannot be used; all the LEGAL ones account for this.
Link for reference only; I do not work/sell blah, blah
https://www.altestore.com/store/inverters/hybrid-inverters-c561/

Prices start at near 2,000.00 for the inverter alone, before batteries.


WE are way off the original topic, new solar kit. The Harbor Freight kit does intrigue me as a quick and dirty.

Roarmeister, you mentioned your brother has a way off grid farm.
I would never suggest that this could replace a ""real"" system.

Could the extra 300 Watt/hr to 800 watt/hr be a useful supplement?
(sun hours Saskatchewan (Estevan High 8.3 hrs, Low 3.2 Hrs, Avg 6.0 Hrs)

Is the kit WORTH it? Will it work for years? No idea, do not have one.
I bought the 45 watt kit years ago; Parts of it were cool,some parts sucked. It sounds like the 100 watt kit fixes a lot of the sucky pieces; there is an Actual controller in the 100 watt kit. I like the LED bulbs, the old kit had Fluorescent, they were ok....
The stands for the panels on the old kit were terrible, the new one looks to be more modular, and the panels appear to have better mounting holes.