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diy solar

Batteries self discharge to dead even with voltage cut off in place

It can be hard to wrap your head around it, but it works.

Life is simpler when you have only two batteries in parallel.
 
Just noticed two batteries are the U1-12RT and one is the RJ I don’t know if that makes a difference?

Also this is happening
 

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What is happening? The two pictures look similar.
I ordered a capacity testing kit, so far it’s counted roughly 60 amp hours out using a 10 amp load

Double picture was my fault I deleted the second one

I set the cut off at 11v
 

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And now I’m pissed because a lead slipped off and I have to start over ?
 
This implies you have a very poor connection to the battery. it's unlikely you will get good test results.
Huh?

I moved the board to see the numbers better and an alligator clip launched into orbit?!

Thanks for your input
 
Update I ran the whole three batteries down and only got 79 amp hours out of it. So I pulled them out of the trailer charged them all up and am testing each battery separately. Not using alligator clips, AND using the four wire config on the DL48 so the testing unit has a reference voltage signal. Fingers crossed, I can run it at 180watts max so it’s pulling 14.4amps an hour.
 
First battery second battery
Flashing green led

!!!!!8.6volts!!!!!

Was 13.6 when I started test on batt one

And tested the same when in the trailer

I think we found the turd
 
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