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Tesla Powerwall 3, home battery
13.5 kWh, charging at up to 5 kW and discharging at up to 11.5 kW, on a tariff that would follow the day-ahead price quarter-hour by quarter-hour.
Round-trip efficiency 89 %, from Tesla's datasheet. Network charges and taxes, which a household pays on every kWh it draws, are left out.
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The next five years on our calibrated price model, in a low, a base and a high scenario: the median and the conservative figure of each year, and the NPV and IRR on your own size and capex.
Indicative figures only
They come from simplified models: simulated prices from a model calibrated on the past, an asset as its datasheet describes it, and a battery that knows the next day's prices when it plans a day. They describe a range of possible markets, not what the market will do. Before any fee, tax, grid tariff or wear of the battery. They are neither a forecast, an offer nor investment advice.
A household in France does not trade on the day-ahead market: the home battery is shown as if its tariff followed that price, which overstates what it would save.
Tesla, Powerwall and Megapack are trademarks of Tesla, Inc. Rigular is not affiliated with Tesla; the specifications are those of its public datasheets.