Next project is a 120v/240V inverter set up. That way I have a basic UPS for the shack. Looking at a battery from an electric car. Less heat and waste to invert big DC voltage to big AC voltage.
Good luck on this. A Prius battery is NMHi and208 volts but only about 6 amp hours and weighs about 85 lbs. They would no be cost effective even from a bone yard. A Chevy Volt uses a 370 volt 45 amp hour battery is Lithium and weighs about 440 pounds.
I really don't need engineering advice from some one dumb enough to run a generator in his garage.
Nor did I say what battery, when I am doing it, or how much capacity it will need. So again your facts are simply useless. After I define the need, put together a one line drawing of the design, then I can begin to look at what parts are available for what I need it to do.
And as in other threads what is NOT cost effective for YOU does not limit me to what I decide IS cost effective for ME.
Or to put it simply, I really do not care what you think. Nor do I need your advice or commentary.