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Battery Storage & Grid Backup

We currently have a 3Kw solar PV system with a 4 Kw inverter. At some point, we would like to add battery storage. However, since we are not heavy power users, battery storage would not result in much extra savings on our quarterly bill. This is because almost 50% of our billis the supply charge. Even if our consumption is zero we still have to pay about $120. To me this is quite a large amount for the privilege of grid back-up for a solar PV plus battery storage system. Theanswer is to go compl ...
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