Bank These Batteries? UPDATE
Updated 28 April (Changed topic so starting new thread) Now I need an opinion/facts if I can bank this big one with my two smaller AGMs even though they have different "cycle use" charging specs...
Forum Discussion
wa8yxm wrote:
I did not follow the links but as SMALL differencer in voltage during the Bulk/Absorption statges would not scare me off. The float is the same and batteries in parallel form a "power commune" each according to its ability each according to its need.
I am more worried that the big 250AH might be more of a "floating/standby" type, and not be able to take high amp discharge (MW on inverter) or high amp recharging so well as the two 100AH batts, that can take that (as proven in service).
If banked, of course they share everything, so the impact on the 250 would be less than by itself. Yes, they share in proportion to their sizes in AH and will all keep the same voltages and SOCs while banked.
I would be giving up the advantage of being able to run down the 250 "house batt" and still be able to run the "inverter batt" without setting off its low voltage alarm (which is a real advantage), but OTOH, I have been with the 250 down to 50% and no way to recharge it right away, and still have bags of AH left in the inverter's bank, but unable to use those as wired up with no connection to the "house" 12v stuff.
I do have an extra couple of Wet 12v 27s to take along for extra house work to add to the 250 same as I did with the two 6s as "house" if the forecast is for no solar, but that is a pain. Six batteries.
I am looking at banking the three AGMs instead as a possible way to "get it all", with no solar for four or five days before going home. (No generator or shore power)
It has turned out that the typical AH usage makes this look possible, so I want to know if banking the AGMs is at least an option.
---I am adding to Mex's steps, that now they are all disconnected and charged up, I will leave them off Float like that till tomorrow and then get their resting voltages when full, to add to the later data of their resting voltages after being discharged to about 50%. Might mean something, and easy to get.
This might be a time for me to get one of those 1,2,Both switches some guys here swear by.
