Our top-notch 51.2 Volt 100Ah, 10.240KWh Residential ESS Lithium LiFePO4 Battery. 15 Year Typical Lifespan & 5 Year Warranty.    If you want to build a huge off-grid solar power system with all the features you can imagine for a low price, then BAUFAR 51.2V 100Ah residential ESS batteries are the way to go.