#NEXTAB USING BATTERY WHEN OFF FULL#
If you had a larger battery bank (large AH capacity), you could get 2 volt cells and use a 2 volt per cell BMS and get the full advantages (and the "mess" of wiring up 12 sets of BMS wires-One wire for each 2 volt cell, 12 cells total for a 24 volt volt battery).ĭepending on FLA battery "quality"-Lower cost batteries typically have a 3-5 year life. So a lead Acid BMS would be wired up for 6 or 12 volt batteries-And you would not have a per cell BMS-But just a per battery (group of cells) BMS-And you would not have the advantages of per cell BMS. For typical (modern) lead acid batteries, you do not have access to each cell (no exposed bus bars).
#NEXTAB USING BATTERY WHEN OFF SERIES#
So cells with different state of charges (such as a 50% charged battery in series with a 100% charged battery) is not a good thing.īattery balancers are usually used with various Lithium Ion type batteries were controlled over charging (high voltage, and low voltage cells) are quickly damaged/ruined and the BMS (battery management system) is used to prevent cells from diverging state of charge and over/under voltaging cells.įor Lithium Ion batteries, a BMS system need access to each ~3.4 volt cell. AGM cells do not let much current through when EQing. You do not want AGM batteries to generate much gas or they overheat and can vent hydrogen+oxygen, which can reduce their life by a lot (you cannot add water to AGM/Sealed batteries, and excessive gassing overheats/wears out the catalyst). And EQ for AGM batteries is just holding the absorb setpoint for 8-24 hours once every ~6 months. Sealed lead acid batteries, like AGM cells typically do not get out of balance very much.
When the SG from low to high cells is greater than ~0.015 to 0.030 SG units, then EQ is done.ĮQ is somewhat hard on a FLA cells, so you only do it when needed and for a limited amount of time. And the other is to EQ when the cells are out of balance when measured by their specific gravity. There are two suggested times to EQ a FLA battery bank. The fully charged cells are overcharged (and "gas") and let around 2.5 to 5% rate of charge current through-And this current charges the "weak cells" and brings them back to full charge. Equalizing charge is a mild over charging of the battery bank. Generally, Flooded Cell Lead Acid batteries do not need/use a balancer.
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