[domh]

> The batteries can fill up on the off-peak rate overnight at £0.07/kWh, and then export it during the peak rate for £0.15/kWh, meaning any excess solar production or battery capacity can be exported for a reasonable amount.

Honestly I didn't know this was allowed.

I recently got a heat pump and am on a time-of-use tariff (https://octopus.energy/smart/cosy-octopus/) and have been thinking about pulling the plug on battery storage for a similar purpose (charge during the cheap hours; run the house off battery during the day). I am currently using between 40-50kWh per day - anyone have similar usage to this and can recommend batteries for this?

[webjunkie]

A word of caution: It's worth factoring in battery depreciation. That 7p→15p arbitrage isn’t "free" profit: you pay round-trip losses and you burn cycle life. If you assume ~£X installed, ~Y usable kWh, ~Z cycles to 70–80% capacity, the wear cost alone is often several pence per kWh throughput, which can wipe out most of the spread.

[Scott_Helme_]

The only restriction placed on you is the export rate, which is provided to you by the DNO here in the UK. We had a limit of 3.8kW placed, which is programmed in to the batteries by the installer.

Octopus also have more flexible battery export tariffs if you want to explore those: https://octopus.energy/smart/flux/

[dabeeeenster]

I just had Solaredge battery installed in my house in the UK (Had a solaredge PV and inverter so made sense even tho it was more than other setups). If you are up for a challenge https://springfall2008.github.io/batpred/ is AMAZING and basically optimises when to charge and discharge your battery.

I've got a heat pump and think my paypack period is going to be about 6 years.

Hit me up on bluesky (in profile) if you want more info!

[domh]

Thanks! I will check out Solaredge. Biggest thing right now with the heat pumps is lack of consistency of software.

Just looking at Havenwise (https://www.havenwise.co.uk/) and my manufacturer isn't supported.

[Perz1val]

Why wouldn't it be allowed? They're essentially renting their batteries and grids generally lack storage

[domh]

Yeah not sure really. I thought these time of use tariffs were intended for charging EVs and using heat pumps, not charging batteries and selling the energy straight back to them later on in the day. But when you put it like that (decentralised grid storage) I guess it makes sense.

[syncsynchalt]

It benefits the grid to have people consume extra power when there's an oversupply, store it and give it back when there's undersupply. Why shouldn't it be allowed (even encouraged)?

[coryrc]

Because of regulatory capture, only the big companies should be allowed to sell at retail and make profits.