DIY 200Ah LiFePO4 battery < $900
First watch this video Lithium Iron Phosphate (LiFePO4) 120Ah Grade A Cell Capacity Testing! The same company, BLS Battery Industries Limited, that sell those 120Ah cells also sells 200Ah cell ! B...
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I installed a Renogy 170 AH LiFePo a year ago that I purchased from Walmart for $980 plus tax. It was at that price for a short while then went up to $1400. So far it is working well. If it lasts as long as claimed it will be cheaper than lead acid.
