alt Hacker NewsIn Scotland it looks like I use 10kWh minimum (not in), 20kWh on a “normal” day and more when I charge the EV.
Family of 3 in a Bungalow.
I’d love a system like this to charge on my cheap overnight tariff and use during the day. Solar just isn’t worth it here.
I think it would just about break even on an economy 7 night rate saving about 17p/kWh shifting load to the overnight rate. (Might save more on a smarter tariff.)
A 12kWh system costs £5880 including VAT. Assume 95% round trip efficiency and 80% cycle each night gives savings of £565 annually.
That's about the same as the cost of a loan at 5% for the total amount paid back over an estimated useful life of 15 years.
This assumes it doesn't need servicing in that time and you can DIY install.
I don't know whether home systems like this will get much cheaper as the batteries themselves probably only make up about 20% of the system cost.
There are huge economies of scale for utility scale storage with all in project costs now down to $125/kWh meaning 12kWh would cost just $1500 rather than $6600 for this home system. So I wouldn't be confident the price differentials between day and night rates will remain as high over its expected lifetime.