Cheapest home storage battery options?

Solarchaser

Yeah you get very cheap normal electric... probably due to lower connection charges since your power companies pay about a half to a third of what mine do.


3 hours is the cheapest option to fill the home batteries, ev charging in Scotland is still free for most chargers, so I don't use the 3 hours to charge the EV, I charge it from public chargers, usually when I get to customer locations.

Though tbh 3 hours at 6-7kw would be fine for most days, only days where I'm going long journeys on consecutive days would it not be enough.

arty688

Heres my man maths 

I was using the Givenergy 8.2kw battery in my calculations it has 100% DOD and an unlimited cycle 10 year warranty.
This adds about £3.5 k to my PV quote.

I'm using 15p peak and 5p off peak 4hours

I use around 21MWh annually with a base load of about 500w

so PV on its own 5Mwh generation probably use 2Mwh so save £300 with £100 exported so £400

with battery I would hope to use 4Mwh so save £600 with £30 exported so £630

so that's an addition £230 over 10 years £2.3k

Also most days I would be charging the battery off peak and discharging it at peak so i picked 200 days

so that's 8 x 5p = 40p use at 15p = £1.20 saving 80p x 200 days = £160 - 20% = £128

So total addition savings £360 so 10 years £3.6k

So not a conclusive result.

The unknowns 

 is the cost of energy going to go up ?
Are off peak tariffs going to stay?
How long after 10 years will the battery last ?

I decided to go for a battery because I think energy price will go up(along with everything else).

Also if I already had PV the cost would be more like £4.5-5k so wouldn't make financial sense ATM.

Heedtheadvice

Interesting transmission charge map @Solarchaser. Where does that come from?

Solarchaser

At a use of 21mw you are more than likely to be able to use much more of your solar, and definitely battery than the rest of us would expect.
I'm a high user at around 8mw.....

Heedtheadvice I've had it a while, I think it came up in a Google search.
Though I can't remember the terms tbh.
I searched grid connection charges just now and this came up, similar if not the same. 

http://www.scottishenergynews.com/higher-connection-charges-in-scotland-than-ruk-are-no-barrier-to-electricity-generators-says-national-grid-chief/

Heedtheadvice

Thanks @Solarchaser

arty688

The payback calculations have now changed as Octopus GO is around 24P peak . 

mickyduck55

arty688 said:

The payback calculations have now changed as Octopus GO is around 24P peak . 

My Go Faster account still states 13.8p / 5.5p, scary rise to 24p

arty688

Yes I think you get 12 months from when you join GO/GF so mine will stay as they are until April 22 , I just hope its calmed down by then.

Solarchaser

arty688 said:

The payback calculations have now changed as Octopus GO is around 24P peak . 

Do you have a link for that?
My octopus account says nothing about that.

I've been with octopus around 18 months, and on go around 10 (pandemic kyboshed the meter install)

arty688

https://octopus.energy/go/rates/

might want to check when your deal ends