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Tesla wants to power your home with a battery
- ghshephard 12y ago"Those batteries start at about $13,000, though California's Pacific Gas and Electric Co. (PCG) offers customers a 50% rebate. " For the summer, California E-6 Residential rates are $.32/kWh during peak times, $0.13/kWh during off peak. If your house is using, say, 4 kW, for 5 hours during peak - then that 20 kWh will cost save you 20 * ($0.32-$0.13) = $3.80/day in power costs, approx $115/month. Do that for 4 months/year ,that's $460/year. With a 5 year life, that battery would need to be less than $2300 to come out even. http://cleantechnica.com/2014/09/05/teslas-gigafactory-may-h.. http://cleantechnica.com/2014/09/05/teslas-gigafactory-may-h.... suggests that $100/kWh is in the ballpark. @$6500 net, after rebates, that would mean the Tesla battery would have to be on the order of 65 kWh to be a no brainer, which is unlikely given that they were, according to the article, previously demoing a 10 kWh battery. I'm sure they've thought it through though, so will be nice to see where my math around $100 kWh is wrong.