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My electric company sends out monthly letters and it says the cheapest time to use electricity is after 6pm. The day time hours are prime and cost more. They have tips on saving money and stuff, it always says to dry clothes and stuff like that after 6pm. FoxForceFiveVega Â· 9 years ago.
If the night time cost of electricity is *half* the daytime cost (i.e. 6 cents per kwh), then the powerwall would allow you to store $2100 of electricity at night and use it during the day when it would have cost you $4200. So, in that scenario, the powerwall would save you $2100. The 7kwh powerwall costs $3500. So, maybe, maybe not. So, the only way to know for sure would be to get the exact prices of electricity in your area for day and night and run the numbers. The only problem with THAT is 5000 cycles / 365 days per year = 14 years.