I have built my own house battery from a repurposed electric vehicle lithium battery. Linking through a hybrid inverter and imported BMS. True storage capacity around 15kWhr. Total battery & BMS cost about $7000. My labour was about 30-40 hours. I have 5.25kWp solar and am fully self sufficient for 8 months of the year. I will add another 2-3 kWp solar before next winter to keep the EV's charged through winter
But the cheapest solar battery is your electric hot water cylinder. If you haven't already, get a solar power diverter to manage your hot water heating. For about $1000 investment you will have free hot water for 9 months of the year
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