alt Hacker NewsIf you had a big enough battery, could you sell electricity back to the grid later? Get paid to charge the battery, get paid to discharge the battery?
It seems silly, but actually... it's driving useful behavior I suppose. Then again, maybe a good government would notice this and just fast track grid storage rather than distribute that work to all the citizens.
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A lot of the value to homeowners is essentially arbitrage on the retail cost of electricity: when prices are high you're going to be paying a lot more to pull electricity from the grid than you would be paid to supply it, so you're better off using up the buffer yourself as opposed to paying for electricity from the grid.
Someone at the utility went through the same math you are and decided it isn't worth it at scale. It's probably not worth it at small scale.
> If you had a big enough battery, could you sell electricity back to the grid later? Get paid to charge the battery, get paid to discharge the battery?
Yes, some people do this. There's even a startup built around the idea: https://www.axle.energy/
Sure you could. How much do you think they will pay you per kw? 1/10 what you paid them and they will charge you for using their infrastructure..at least in the US they do.
Overall on it's own that isn't yet profitable to do, unless you're e.g. a wind producer.
Yes. I have a 4.8kWh battery which is slurping up electrons. It charges either from our solar panels or from cheap grid electricity.
It discharges when prices are high. So it'll mostly go into my oven tonight. If export prices are high, it can also sell back.
Very roughly, we sell about 16% of our stored electricity - the rest is used by our home.
See https://shkspr.mobi/blog/2026/02/30-months-to-3mwh-some-more...