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> Is your $0.11/kWh price just for the stored amount at $200/kWh? That conversion factor to kWh-stored prices is more favorable than I've been using, as I've be
by fweespeech 11y ago
> Is your $0.11/kWh price just for the stored amount at $200/kWh? That conversion factor to kWh-stored prices is more favorable than I've been using, as I've been assuming about ~1000 cycles worth of storage, but then I don't really have a good number for that.
Yeah. I don't really have good numbers but Powerwalls have a 10 year guarantee iirc and many batteries have a 5 year guarantee so I was using a higher number.
> Solid pricing information for large quantities of batteries is hard to get, but GM recently disclosed their price to be $145/kWh, and apparently LG Chem's other customers are paying around ~$100 more/kWh [1].
GM isn't selling it to consumers at $200/kwh but is buying them from LG Chem and its a deal for far larger production runs. GM is going to get a much better deal than you or I [who will only buy a single bank of batteries every 5 years].
- epistasis 11y agoI just read that the Tesla Powerwall has a warranty to 5,000 cycles [1], which is 5x what I thought it would be. Without installation costs, that's $0.095/kWh == $3000 / (7kWh * 5000 cycles * 0.9 efficiency). Which means that consumer storage is already within your $0.11/kWh price; that's completely astounding to me, and means that on the grid scale it will be even cheaper.... I imagine that the days of peaker plants are coming to a close entirely. This conversation has made me hugely optimistic. Huge swathes of the country are already primed to go completely off grid, economically, then. If solar costs $0.06/kWh, and half of the energy is stored at $0.10/kWh, that's a total price of $0.11/kWh for an off-grid site. That's far cheaper than what I pay for electricity right now. https://en.wikipedia.org/wiki/Tesla_Powerwall#cite_note-2015ecP4-9 https://en.wikipedia.org/wiki/Tesla_Powerwall#cite_note-2015...