Parallel 12volt, more capacity then AH rating? 2.7 x's more!

lawrosa wrote:
I only wish he did it with series 6 volt batts...

You're reading way too much into this ... yes, using 2 paralleled 12 volters of the same type, age, etc will yield a multiplying effect but it won't be any different than using 4 similar 6 volters in series / parallel as that's all those four 6 volters represent electrically - two 12 volt battery supplies in parallel. Secondly, in practical terms few of us are going to buy high end industrial grade batteries as used in this test so there's no chance you're going to find 1+1=2.7 as this YouTuber claims - more like 2.2 for garden variety batteries most of us buy. There are so many other variables that will affect this multiplying effect as well, with those batteries with lower internal resistance better able to withstand heavy loads with less voltage drop. Think about it - while this may be an interesting test no RVr in his / her right mind is going to intentionally draw any deep cycle battery 100% to 10.5 volts when most consider ~ 50% draw down the most you'd want to do on any regular basis if you expect to get reasonable use out of those batteries. Yes, the bottom line is there will be a multiplying effect if using multiple batteries but it's fantasy to believe it will be anywhere near 2.7 for a pair in any practical application. :R

if ya compare a discharge rate to 1/2 discharge rate (2xbatt) ya might find a 10% increase based on this 2004 JCI spread sheet.


Click For Full-Size Image.

Tom_M wrote:
The video is simply a demonstration of Peukert's law. As the rate of discharge increases, the battery's available capacity decreases.

Yep, 6v or 12v shouldn't matter as long as they hold the same number of watt-hours at the same rated discharge and are both deep cycle designs (not labeled but actual design).

The video is simply a demonstration of Peukert's law. As the rate of discharge increases, the battery's available capacity decreases.