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I have tested the voltage of each of the 3 banks and the voltages are 13.11, 13.19 and 13.2V. I disconnected the parallel cables and the voltage of each individual battery is identical to that of the bank it belongs to so it appears that the voltage has equalised across each battery in the bank.
Re: charging AGM batteries in cold climates you could, but temperature compensation of the voltage needs to be there. a cold battery will need a higher voltage and just how much should be in the battery specs for your particular battery. once charging starts it will start to warm the battery up and the temp compensation will change as it goes up.
Re: Should an AGM battery make sounds while charging? The short answer is they should not make any sounds at all. The problem is most likely with the charger though. AGM batteries are usually marked with specific charging parameters on the battery, on my 260AH batteries it says the following: Constant voltage charge @ 25°C: Standby use 13.6-13.8v
I'm Surprised that none of you know the reason to set Battery type to the right type of battery. Most PV controllers have several types of charge available.They can use Bulk Charge, Constant Charge, Boost Charge and Float charge. Finally they use a level called Equalization. Equalization is mostly used for Lead acid Batteries that are not Gel.
I would not waste any energy heating a cold AGM battery. When they are fully charged, they can withstand very cold temperatures. When they are cold, there is very little self-discharging. Storage above -4F, is not realistic; Vmaxx needs to explain why. Charge above 14F, is not realistic; Vmaxx needs to explain why.
My XW6048 charger is set to a float voltage of 55.4v for my AGM battery bank (4 cells in series in 2 parallel strings), but the float voltage of my SCC is set to 54.0V by default. Wouldn't that use grid power to keep the batteries topped off instead of PV? I would think the SCC float voltage should be set a little higher than the inverter's charger, but by how much, and what should the voltage ...
Re: New AGM discharged to 4 volts. At this point--Recharge the battery and see how well it works. If it is new and none of the cells went reverse polarity--It might work OK.
3. Install a charge controller to prevent overcharging (AGM batteries prefer a lower float voltage than starter batteries). My first question is whether it is worth wiring the negative battery terminal all the way back, or whether I should just connect to the vehicle frame near the hitch.
Re: Problems with Renogy charge controller and AGM battery charging. welcome, first you should disconnect he 26 and 55Ah batteries or you will overcharge some and possibly undercharge others. second, 5 parallel batteries is not a good method. Always only charge batteries with the same Ah rating, recommended max is 3 in parallel.
The battery configuration is 2 parallel strings of 2 12V AGM batteries. The four batteries are 155AH each. Just before I hooked up the #4/0 cables to all the batteries, I checked the voltages. One string has both batteries at 13.09V. The other string has one battery at 12.94V, and the other at !3.15V.
