agm capacity test
I've installed 2 8d deka intimidators in my fiver. Closing in on 15 cycles. Would like to do a baseline test so I will have something to compare to in the future. What would be the proper way to prefo...
Forum Discussion
big buford wrote:
Is it possible to to use say 25a draw until victron registers 245 ah consumed 50%, let batts rest for x amount of time and get voltage reading ? Thank you bfl I will study your post :)
25a is not necessarily the 20 hr rate, so my test method would not work unless it is the 20hr rate. I missed whether your bank is 245 or 490. If 490, the 20 hr rate is 24.5 so yes 25a then would be right. (say eight 3a Rv lights on as your load being close enough to start with)
Another test is to get it to 50%, leave it rest to confirm 50 by voltage, take your AH reading on the monitor, then recharge till the batteries will not take any more amps (being full) now take the AH.
Tricky bit is how many AH to allow for heat loss? Trimetric uses 4% so that much is already counted in. Your monitor may use a different amount or none. Somewhere around 5% or even 10 could be it--no idea with AGMs. Anyway, allow for heat loss and that gives you your AH for the recharge, then double that to get the capacity.
