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by foobazgt
721 days ago
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At $6343 [1] for 13.5kwh [2], seems closer to $500/kwh? The federal rebate does help substantially, but most folks should qualify. This # is closer to $400/kwh if you buy with solar, and $300 if you're buying a few instead of just one. Re: car batteries, the difference between the rear-wheel drive and long range is about 20kwh (60kwh vs 80kwh), for $8K. That's $400/kwh and doesn't even include all the other trim differences like having dual motors instead of single. So, it looks like reality is closer to $300-$400/kwh, depending. Not close to your ideal of $50/kwh, but still much better than $1000/kwh. 1) https://www.tesla.com/energy/design/overview
2) https://service.tesla.com/docs/Public/Energy/Powerwall/Power... |
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You have to charge the battery with electricity (which you could sell or have to buy), and then when you discharge it you are either offsetting electricity you would buy, or selling it. Throughout the process you're losing some of it (~8%), and the battery is degrading in capacity towards eventual replacement.
You also have black swan events - i.e. an early battery death due to manufacturing defects.
i.e. my rooftop solar array sells power at 7c / kWh. When I run the numbers on various offset scenarios, the cost per kWh delivered after all expenses and life time costs that I can find tends to be about 7 - 8 c / kWh. Which honestly makes perfect sense to me: the electricity company, at much more massive scale, can install and run batteries more cheaply then I can.