Charging AGM batteries
I have never owned an AGM battery, but the new trailer I am getting will have 2 of them. I replaced the converter/charger in my previous RV with a PD4655V, and am thinking of installing the same i...
Forum Discussion
BFL13 wrote:horton333 wrote:
The AGMs are rugged and this charger will do ok. AGMs always need less voltage than flooded cells for proper charging, they have inherently lower internal impedance, so you may want to put in a larger charger as off grid as even a small AGM can take a lot more than 45 AMPs easily without overheating and why run your generator longer than needed if your solar cells don't give enough on a given day.
AGMs do not "always need less voltage than flooded" and some do have charging amps limits. Mine do. These 100AH ones want 14.8ish (same as Trojan flooded) and 27% charging rate.
http://www.hespv.ca/hesproductspecs/HES/Stark_Battery_TD_ENG.pdf
Sure some are *specified* to take overkill like 14.8 volts and may even survive, but it's not *required* like it is with large flooded cells.
Part of the reason why AGMS are designed the way they are it to take more current at a given voltage (and store the power more effectively too), so always is the appropriate term.
BTW that specification sheet indicted a current limit of only 27 AMPs, to prevent the stress that a high power supply and 14.8 volts would do perhaps.....
