4 graphs 2 batteries
So I used one 100 ah battery for 2 helix 12s. That is all I had hooked to it and it ran them for 10 hours without an issue. So I put a Garmin 16 and a 12 to make 4 graphs powered on all day - the battery went 6 hours and went dead. Installed another 100 ah battery and joined them together and ran all 4 for 8 hours the next time out and we still had 13.2 volts left. I think next time I will stay out late and see how long they will stay working !! Awesome product !!!