microhydro battery bank
Hello, Hope nobody minds a microhydro based question. I have a small, homemade, battery based microhydro system. I also have grid power. I switch individual circuits back and forth to maximize the hydro, trying to balance the input with the loads. We tend to charge the batteries at night when sleeping and while at work and run them down slightly when home and awake. After about three years I've begun to have battery problems and am researching how to approach dealing with my batteries. My current bank consists of 4- 12 volt 165 amp hr power battery gel batteries run at 48 volts. They charge up fine but lose voltage quickly even at low loads. I never run them below 80% state of charge. Well maybe a few times. I have not tested them carefully to find the problem. I was thinking of upgrading to sun xtender pvx2120l to increase backup capacity. Then started thinking about minimum charge current and how to deal with that. The hydro output is 6.5 amps max at nominal 48 volts . For several months a year it can be lower, some years down to 1 amp. This does not meet the 5% minimum charge current rule. Do I have to size my battery bank smaller? Can I periodically charge at a higher rate with my inverter? ( magnumAE4844). How often would I have to do this? Thanks for any help or suggestions.
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