Thanks, all, for your timely responses and clarification requests. I am in pre-installation mode. This is my set-up. The only charger I have is my solar panels going thru my controller (details below). So, I was charging each one individually to top it off. I left each on the charge controller for a couple of days. After that period, each of them were not getting any more charge voltage. To be clear, my voltage measurents were with a multimeter when the batteries were disconnected from the charge controller.
By what indication did you determine them to be fully charged?
after each battery had two days of good sun each, one at a time, on my solar controller
[13.3v] That is not fully charged.
this was my reading after the batteries were removed from the charger and settled... I
How much time with what charger/how many amps for how many hours?
two full days under good sun, one battery at a time. Solar and charge controller specs below. Also attached is a screenshot of my Renogy DC Home app; shows 0.1A Battery Charging Amps at the end of this period, and while connected to charger, it's showing 14.4v.
what voltage did you charge them to and what were the Amps when the voltage hit that charge voltage?
While on charge controller, it always shows 14.4v, and at the end of two days .01A charging amps.
you should give each battery the same amount of time to settle and then measure the voltage when they have settled to about 3.3 volts per cell or 13.2 for the battery.
Yes, thanks. Don't have access to the cells, but yes, after settling, and disconnected, the four batteries are reading
- 13.3
- 13.3
- 12.78
- 12.87
So, with all that detail, does that give you experts enough info to help me determine if two of these batteries are deficient? Thanks A LOT!
## Solar
- 2 x Renogy 320W 24V Monocrystalline Solar Panels
- parallel = 24V 26.6A ==> 640W
## Charge Controller
- Renogy 60A 12V/24V/36V/48V DC Input MPPT Solar Charge Controller
## Batteries
- 4 x LiTime 12V 100Ah TM LiFePO4 Battery, Low-Temp Protection For Trolling Motors