LiFePo Batteries ???????

[barfwinkle]

GE to all.

A quick question. My LiFePo batteries (2x100AH) have been performaning flawlessly. but this weekend I checked and one battery was at 52.0% DOD and the other was at 98%. I was under the impression that they discharged at "about" the same rate and for the last year they have been doing so (+/- about 10 V). Any ideas?

400W panels and 12v system with 40 AP MPPT controler.

TIA

Bill

 

[meetyg]

Did you fully charge them before connecting in parallel?
Are the wire lengths even from both batteries?
Check your connections, maybe one is loose.
A picture of your setup might help.

 

[Bud Martin]

GE to all.

A quick question. My LiFePo batteries (2x100AH) have been performaning flawlessly. but this weekend I checked and one battery was at 52.0% DOD and the other was at 98%. I was under the impression that they discharged at "about" the same rate and for the last year they have been doing so (+/- about 10 V). Any ideas?

400W panels and 12v system with 40 AP MPPT controler.

TIA

Bill

BTW, how did you go about checking the DOD of the batteries?

 

[barfwinkle]

Tnx for the reply. The DOD was checked using the bluetooth app DC Home. The batts have been performing flawlessly for over a year. Yes I disconnected them and then ensured all connections were clean and tight. I thought I had a pic but I don't. The batts sit side by side & the wires connecting them are the same length. I also checked all fuses in the system. When I left the cabin yesterday both batts had re-charged to 99%.

In my original post I mention "(+/- about 10 V)". That should read "(+/- about 10% of capacity).