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  • Lithium Iron Phosphate (LifePO4) solar storage battery bank

    Friend, BMS is critical for LiFePO! I am using a similar setup but with a 6s rc battery, and let me tell you, lipo batteries are very dangerous and difficult to maintain. In your configuration, you are seriously and irreparably damaging your battery and placing yourself and your house at great risk of bodily harm or/and a fire.If individual cells are charged unequally (the issue that a BMS manages), which happens as the charging and load voltages of the individual cells change independently due to the "daisy-chain" configuration of the battery itself, you may be overcharging a cell. This causes it to explode and start a fire so hot that conventional fire extinguishers will not put it out, not to mention the poisonous chemicals everywhere, or you will draw current from a cell t...see more »Friend, BMS is critical for LiFePO! I am using a similar setup but with a 6s rc battery, and let me tell you, lipo batteries are very dangerous and difficult to maintain. In your configuration, you are seriously and irreparably damaging your battery and placing yourself and your house at great risk of bodily harm or/and a fire.If individual cells are charged unequally (the issue that a BMS manages), which happens as the charging and load voltages of the individual cells change independently due to the "daisy-chain" configuration of the battery itself, you may be overcharging a cell. This causes it to explode and start a fire so hot that conventional fire extinguishers will not put it out, not to mention the poisonous chemicals everywhere, or you will draw current from a cell that may not be charged to sufficient voltage, which requires more current (vicious cycle here), further dropping the voltage, which will deplete the battery below the minimum voltage required to ever be charged again. This then puts a great deal more load on the other cells since the load is "expecting" the voltage that it will not be able to produce, so it will try to accommodate this need with more current, leading to a short/more dead cells/fire. I would test the voltage of the cells independently, and if there are any differences between them I would recommend safely and completely discharging the battery and disposing of it. Since you're using a fairly large capacity battery these issues may not have been apparent but they are very dire. I have blown and shorted cells before and it is an absolute catastrophe, using only an 8ah battery. Simple voltage controlling is sufficient for lead acid, not lipo. Check out electrodacus.com and read up on your safety!!! The world needs us DIY guys to make solar/modular power widespread, don't want to hear about an innovator getting hurt. :)

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