I do have current limiting by having chargers with that, so they do constant amps until the battery acceptance rate gets down to that limit when amps then taper with rising battery voltage.
Just how long it stays in constant amps is simply a matter of the charging rate--meaning the percentage of the charger amps to the AH capacity of the battery bank. A higher rate will get the battery up to the charger's voltage sooner, and at a lower SOC. Using a lower rate will make the bulk stage go on for longer and absorption will start at a higher SOC
At the 20% rate for AGMs, bulk will end at about 75% SOC and amps will then taper.
If Mex says to hit the 100AH battery with 15 amps, that is a 15% charging rate. The 15 amps will be constant till about 80% SOC and then taper. (unless you start raising the voltage) is that what he really meant? Do that until you have voltage up to 16.2 and then quit?
My lowest amp charger with adjustable voltage is a 45 amper. That would be 15 amps each for a bank of 300AH worth. I could use the 45 on the 8D 250 AH and be over a bit. Using it on both 100s is way over 15 each. Mex says do them one at a time at 15 amps each. (He forgot that one is a 250 and the two others are 100s I think)
So now we get to the current limiting at below charger current limit using the light bulb? Get some lower constant amps but still have the adjustable voltage?
What is the point of doing that for 15% that tapers at 80% SOC? Battery acceptance above 15v with the battery nearly full is under 4 amps and tapering. By 16.2 it will be 1 amp maybe?
Beats me. Anyway, I would rather just go try it out and see whether it will work for now the way it is.
