thank you
I tried the google and one part reads "A company called KVAR Energy Savings, Inc. is running around claiming they invented how to apply capacitors to inductive loads. This is not only humorously false it is an outright lie".
When I lived off-grid in 1992, I had a Trace 52 Amp power inverter and battery charger (Model 2524SB). In one test of charging in Home Power magazine, it produced 50 amps of charging as just a charger with nothing else turned on while powered by a 8hp gasoline generator. But when an big additional load of something, a washing machine I think, was connected, the charge rate increased to the full 52 Amps. It had to be due to the lead/lag of the one device straightening out the PF towards 1, if I recall correctly. I may have this backwards and the additional load was a workshop of fluorescent lights. It was 18 years ago.
I hoped the KVAR unit did the same. The salesman at Home Depot swore by his. It sounded too good to be true.
Then the issue remains, how best to protect items that cannot be connected to a power strip of a high Joule capacity? The other devices for sale were a number of ~ $60 units that plugged into the main wall panel instead of the usual 240 volt thing there, commonly the water heater or stove. They had different Joule ratings proportional to their prices.
Are these any good?