Two 6 volt batteries or two 12 volt batteries ??
Two 6 volt bats in series (12v) or two 12 volt batteries in parallel. Generally, which is a better way to go.amp hrs ??? Comments and experiences appreciated.
Forum Discussion
lawrosa wrote:
Well I hope this all helps the OP anyway...
I mean I knew about internal resistance but I didnt think 6 volts would take a huge volt drop @ 75- 80% SOC.
I looked for info on the web regarding this and cannot find much , if any, real world data..
Ill have to test this and document the drop of my 12's @ different SOC this summer.
I cant really source anything bigger then awg 2 gauge without spending a small fortune..
It isn't that GC take huge drop at 80% SOC, it's that internal resistance is high to start with so you are always going to get more voltage drop than a single 12V with thin plates. so if the battery is fully charged, 13.2v and you get 1.5V drop, your ok, get down to 12.8V with a 1.5V drop and your below the inverter limit.
and with a 12V setup it's common to have two 12V in parallel. So first each battery sees 1/2 the current draw and lower internal resistance. both decrease the voltage drop.
