expected normal voltage drop from load?

ewarnerusa wrote:


Thanks for the voltage and current relationship description.

YOu are welcome.

I remember years ago before understanding this myself, thinking that volts and amps were two adjustable entities separate from each other, but somehow mystifyingly related.

Now I understand that when a battery is up in absorption voltage range, the amps required to hold Absv keep tapering. If the amps do not taper then voltage will just keep rising.

One does not want to blow past absorption voltages with an EQ charge until the battery has first had a few hours at ABSV and amps tapered to low numbers.

Mex says to apply 5 amps until 16v is reached doing an EQ. I was just setting voltage at 16v and whatever it took amperage wise to get there, so be it, but if it was over 6.25amps(5% of capacity on a 130Ah battery) I backed off and gave it more time at absorption voltage before bringing it again to 16v and waiting for SG to max out.

I got ~ 500 cycles to an average 50% to 60% SOC from that battery, which is respectable for a 12v marine battery.