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If you get 90% charge/discharge efficiency, you're multiplying the economy 7 tariff by 1/0.81 = 1.23456790 (so close) so it's more like 12.5 years, and a bit le
by CHY872 11y ago
If you get 90% charge/discharge efficiency, you're multiplying the economy 7 tariff by 1/0.81 = 1.23456790 (so close) so it's more like 12.5 years, and a bit less compelling.
- lsaferite 11y agoThat is of course ignoring the other aspects, like battery backup for the house, better for the environment (?), the ability to do solar tie in, and any possible government incentives.
- CHY872 11y agoIn the UK power cuts are very rare in most places (and generators are cheap), so it's not a huge advantage. The enviroment factor is at best tenuous due to 20% of energy stored lost as heat and high energy requirements for producing the batteries; and in any case unilateral green action makes no difference. The solar tie in is quite nice, but current feed-in tariffs are huge in the UK (30p per kWh perhaps), so you're getting more out of paying it back than you would for storing. Government incentives obviously change the calculations, but there aren't any at the moment.