Eric Entemann wrote:
> I suppose the system, which seems to be nothing more than a battery
> and an inverter, could be useful if one needs electricity and no other
> source is available
It sounds remotely like the Delco system my grandfather had in his house
early in the 20th century (before Rural electrification). A gasoline
engine in the basement, with a wall of storage batteries.
But Eric seems definitely correct that anyone calling it "free" is
ignorant or a hustler.