Time for Lithium House

[Delta Riverat]

The wiring looks fine. The batts are seven years old. When mine were 7 years old they were shot.

Not like dhays, the voltage (no load) was fine but no capacity or current left.

 

[twistedtree]

Could be a dead cell in each battery, or it could just be that the batteries have not been throughly enough charged over the years. This is one reason why lead batteries need a long absorb cycle, and some more than others. Are they by chance Rolls batteries? If they are flooded, an SG reading would tell you most everything.

 

[dhays]

What you are saying is that one of the 6V in each 12V battery pair was low? The wiring is as correct as can be done. In each pair, the same current has to go through each member of the series pair. So I'd say just a classic cell imbalance issue. Were these flooded, and did you ever equalize? The ones at 6.4V are normal, the ones at 4.3V are dead.

AGM. I did equalize but likely not as often as I should have.

Anyone want a couple decent L16 AGMs?

 

[dhays]

Could be a dead cell in each battery, or it could just be that the batteries have not been throughly enough charged over the years. This is one reason why lead batteries need a long absorb cycle, and some more than others. Are they by chance Rolls batteries? If they are flooded, an SG reading would tell you most everything.

They are USBatteries AGMs. They were charged according to USBatteries charging recomendations. Other than not being equalized as often as maybe they should be, they were charged well.

 

[Delta Riverat]

I still suspect dead cells. The voltage difference is the same and just about 2/3 cells working. Tall batts make it easier to happen, more vertical plate material to slough off and pile up at the bottom.

Yup, just another reason to do the LiFePO4 - My smile is because I'll never have to do the house bank again!

Those lead-acid starters on the other hand...

 

[SteveK]

@luna are you thinking a poor ground, as in not 100% clean connection?