Testla energy Tesla Motors - 2 views
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LeopoldS on 01 May 15tesla announcing home batteries at 350$/kW
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Ma Ru on 10 May 15Let's do some simple maths... Here in UK, example "economy 7" tarif yields night kWh approx. 12 pence cheaper than during day. Let's say the goal is to store energy equivalent to running a 2kW storage heater for 6 hours during the day. We need 12 kWh, so 12 times $350 this means need to spend approx. 1920 pounds for batteries. Time to break even at ROI: 1920 / 0.12 ~ 7.3 years... And this is assuming using the heater 365 days a year, and quite an expensive tariff (prepaid). SIWB :-)
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Paul N on 17 May 15Also need to take into account that battery capacity tends to go down with time and usage