Watched video. So simple I could easily build it except for figuring out how much 3000 watts will run & what to connect to the generator? Car battery? Inverter? duh!
All that is real easy.
Amp times Volts equals Watts.
or
A x V = W
150 x 12 = 1800
And based on basic math
A x ? = ?
or
? x 12 = ?
or
? x ? = 1200
So figure you need 1200 watts. You have 12 volts and thus need-- ? x 12 = 1200 makes you need 100 amps.
remember that and its really kinda simple.
and most everything should have a label on it detailing what it needs as far a wattage.
Now let those with real electrical knowledge jump in and teach me the error of my ways on this and get it right for you.
Nemo