Hello all.
Several batteries in my AGM bank have given up. It's clear the whole pack will have to go and will be replaced by LifePo cells.
However, Since I'm a cheapskate it's coming from China on the slow boat, so this bank I have will have to be stretched until it arrives.
The bank consists of 8 80Ah AGM cells out of a backup lighting install, they were in a 8s configuration until I ripped 2 over heating units off and now I'm left with 6s 12v.
Those should have given about 2.9kWh of usable power, now they only take about 300Wh from fully empty. I can't imagine they all sulfated that badly in the relative short time I've been having trouble. So it's probable to me there should be some better and some less so cells in the pack. But how to find them?
I'm still using the pack since it's all I've got at the moment so I don't want to pull it all apart before I know what I'm doing. I thought about measuring the resistance but I don't know what kind of results I'd be looking for so I would appreciate any guidance you lovely folks could give me.
Several batteries in my AGM bank have given up. It's clear the whole pack will have to go and will be replaced by LifePo cells.
However, Since I'm a cheapskate it's coming from China on the slow boat, so this bank I have will have to be stretched until it arrives.
The bank consists of 8 80Ah AGM cells out of a backup lighting install, they were in a 8s configuration until I ripped 2 over heating units off and now I'm left with 6s 12v.
Those should have given about 2.9kWh of usable power, now they only take about 300Wh from fully empty. I can't imagine they all sulfated that badly in the relative short time I've been having trouble. So it's probable to me there should be some better and some less so cells in the pack. But how to find them?
I'm still using the pack since it's all I've got at the moment so I don't want to pull it all apart before I know what I'm doing. I thought about measuring the resistance but I don't know what kind of results I'd be looking for so I would appreciate any guidance you lovely folks could give me.