Friend of mine has just gone for the same system, Givenergy 8.2kWh with a standard 3kW inverter.Yeah I've seen that it's starting to sound like a no brainer I'm in process of getting quotes just thought you lovely people on our forums thought about it
Yes very much depends on being on an economy 4, or 7, tarrif and your on-peak consumption, its just a simple calculation.Someone on MSE forums was critical of that video, in particular around you needing an electric vehicle to get onto Octopus Go.
yes that's it. So if I bought a battery on the basis of getting a discount then I'd have to stick to a tarriff that offered that feature.forums.moneysavingexpert.com
If you plan to move house in the next ten years it won’t be worth having it installed, hopefully a good supplier will give you calculations as to how much it will save you, but payback could be 11+ years.
The batteries will probably need replacing around 10+ years too. Some will guarantee the batteries for 10 years, some for different periods of time.
The earlier FIT deals in the UK paid on generation not the energy supplied to the grid I think.I've done sums for a my system with is 4Kw and really it depends on your usage. I've got AC, couple of servers, 2 people living in the house during the day and TBH I use most of what I generate so not much would be going into batteries. Plus it would be a few of the year at best there is a surplus.
I was thinking about cheap overnight option, can't see a tariff cheap enough at the moment to make it worthwhile.Probably not worth getting the batteries if they won’t get used much.
Unless you can buy cheap overnight and use it the next day - not sure how time of use tariffs will look next year, hopefully gas and electric prices start to come down again…
I'm on the old deal, they assume 50% of generation is fed back in. AFAIK you can't discharge batteries in daytime to boost that figure else you could charge overnight and feed it back in during the day.The earlier FIT deals in the UK paid on generation not the energy supplied to the grid I think.
It's all about the difference between your on and off peak rates and your export rate.
As you say it's just sums for your own use patterns will be worth it for some and not for others
Don't think you're allowed to change the setup for the solar, presumably this has the export meter bit.I'm on the old deal, they assume 50% of generation is fed back in. AFAIK you can't discharge batteries in daytime to boost that figure else you could charge overnight and feed it back in during the day.
What will be interesting when we start using EV cars as energy storage.
I think in the short term he's probably right, especially with Russia playing games, but long term who knows.The guy in the video makes some pretty wild assumptions with no evidence to back them up.
1) electricity prices will continue to rise forever more. Based on what exactly? The UK electricity prices are largely tied to the price of gas because that is the main source of fuel for electrical generation.
The price is currently high due to short supply and high demand, is that guaranteed to remain the case forever? Possibly but equally possibly not, no evidence points in either direction.
Also as we increase our wind power capacity (plus other renewables), that price will detach from gas and find its own market rate, the same way it has detached from coal over the past 2 decades and now follows gas. What will that new rate be for a generation method with no fuel consumption? Nobody knows.
He also assumes in his calculations that your house consumes 0 during the night period other than the battery. If you have an EV and can benefit from the better overnight tariff, moving things like dishwasher and tumble drier overnight can already shift a fair portion of your usage to the cheaper rate without the need for any batteries, potentially pushing that payback from 10 to more like 13 years, (also consider this is break even, you havent saved a penny at this point, especially if you fund your batteries with a loan in which case your payback is probably more like 15 years, likely longer than the life of the batteries).
Gas is still roughly equivalent to the night electric tarrifs so heating remains pointless (unless you live in an area with high gas prices or have electric heating anyway).
Also, as more and more people buy EVs and Batteries, and make use of cheaper overnight electricity, the load demand will level out and the incentives will drop.
I'm sure there will always be a small incentive for using electricity overnight rather than at peak times during the day, but it's pretty foolish to believe that is going to be the case when EVs become the majority.
peak UK demand averages at 42GW and minimum demand is about 25GW, that's a difference of 17GW between minimum and maximum.
17GW = 17,000MW = 17,000,000KW
17 million Kilowatts difference. If a standard EV charger is 7.2KW then it only takes 2.5million cars being charged for this cheaper overnight period to become the new peak time of usage, and the pricing model changes again.
there's are 33million cars in the UK so it only takes 1in13 cars to become EVs for this to become a reality.