Dear Bruce,

Specifications on the back of the unit read:

Ratings: 115V Output 300 Watts (2.3 Amps) @ 60Hz
12 Volt Output 20 Amps
12 Volt Input 8 Amps Maximum

I do not remember how long the initial charge took. I leave it plugged
in when it is not in use so it is always charged and ready to use. I do
not use it often. I keep it as a backup power supply. But it worked
just fine when I tried it with my radio and antenna.

Best,

Joe