Does Battery Storage Make Sense Without Solar – Average UK Household Electricity Consumption

Does Battery Storage Make Sense Without Solar – Average UK Household Electricity Consumption

I have been asked a few times if battery storage, like the Tesla Powerwall 2 would be worth getting without solar? I always had an opinion on this, but thought I would do some quick math based on average UK household electricity consumption.

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15 Comments

  1. charles UK on November 25, 2020 at 9:06 pm

    basically you would be better of investing the cash into the companies rather than the products they make…

  2. Ambient Fish1 on November 25, 2020 at 9:10 pm

    IMHO, solar only makes sense with storage? Would be the question if you take the cheap rate electricity as a starting point. If I had cheap rate electricity I would only need to top up the battery from the grid from early November to late January. I try to cycle the battery as little as possible, minimum SOC 40% in winter, since 29th Jan this year I have drawn < 57 kWh from the grid which is the inverter draw for grid matching, all other energy came from solar/battery, as near as I can get to being off grid as you can be with a grid tie set up.

    You have to make some effort to reduce your consumption in the winter for the above result from a 5.3 kwp array, 19.2 kWh battery and a 3.7 kw inverter, in the summer you have much more energy available.

    I wish I had used my savings years ago to do this, I am getting a better ROI than my ISA and the satisfaction of making my own energy.

  3. Darren Finlay-Smith on November 25, 2020 at 9:12 pm

    I had a truly awful experience with a battery quote last week. The sales person turned up on time, I think that was the only positive, sorry a long story follows. He started by asking about my array size which is 3.75kw and then told me i should be looking at a 4.5Kwh system. I said this probably wasn’t big enough and i was looking to spend about half the price of a Tesla PW2 and get about half the storage. This is when things started to go wrong. He initially told me that my system would never fill a PW2 and i should avoid them, i let that slide at first as i had already said 7-8 was what i was looking for anyway. I mentioned i was pretty sure that with the 20ish kwh surplus i get in the summer i could fill a PW2 anyway, he said again i should be going for 4.5kwh. He then said i should also be looking at a AC coupled system and Tesla is DC, now at this point alarm bells are starting to ring as i know they are infact AC. After some back and forth he said he could quote for a double 4.5kwh system giving me 8kwh? I said isn’t that 9, no he said as when you use more than one you lose some capacity? He then said i would get just as much use anyway as when i am charging my car it will be charging the battery as the solar wont be able to keep up with the charge rate. I corrected him and let him know i had a zappi so the solar would always keep up with the charging as that’s what is does. He told me i was wrong and all chargers are even on or off and don’t fluctuate in power. At this point i’m getting visibly agitated to the point me wife felt uncomfortable and had to leave the room. Then what came next was worse, he gave me the price for his 8kwh system ……….. £8K. I explained the reason i was considering a smaller system was for a price saving and if it was £8k I may as well go Tesla. He informed me his chemistry was better as Tesla mirror !!! I just had to correct him saying i am well aware of mirroring and it is generally on NiCd battery’s not LiIon. So he continued and told me his company is removing out of warranty Tesla PW’s they only have a 5 year warranty and many are failing. So i asked again they came out in 2015 and very few were fitted until 2016 in the UK meaning even if the warranty was 5 years they would still be in warranty till 2021 and anyway they have a 10 year warranty, he insisted he had removed several this month. At this point i polity informed him i would not be using their company. I took me a couple of beers to came down. I feel sorry for any of his victims who are less informed on the subject as i think he may well of ripped some people off.

  4. Charlie Devine on November 25, 2020 at 9:16 pm

    You need a difference in electric rate of at least $.30/kwh between peak and discount rate for it to make sense at all. Also, if you use electric resistance heat for heating water or space heat then you can store energy much more cheaply in hot water heaters. A difference of 9 pence is not enough to make it worth while. By the time you pay back that Powerwall the cells will be completely degraded.

  5. MatahRL on November 25, 2020 at 9:18 pm

    Your telling porky pies, it’s 9.5p for the night rate with octopus energy, not 5p like you said

  6. JImHig on November 25, 2020 at 9:25 pm

    Thanks, I imagine that the price of batteries may fall rapidly in next five years as car batteries enter their second Life phase.

  7. Dave Askew on November 25, 2020 at 9:25 pm

    Great video, we had looked at battery storage to compliment our solar panels, but have decided to explore vehicle to home grid as the more cost effective solution, though the list of current cars supported is limited, hopefully the likes of Tesla will add V2H V2G to their cars allowing us to use an EV battery to supplement our solar panels and the grid.

  8. double ooh 7 on November 25, 2020 at 9:27 pm

    if you discharge the battery to 5% everytime before you charge it it’ll decay slower unfortunately if charging every night you’d have to charge it no matter how much charge is already in it decreasing battery life faster! if you always leave energy stored in a battery that energy which is not used goes stagnant corrupting that part of the battery,batteries designs have a major flaw it’s like a glass of water the first bit you drink is the last piece you put in, the first piece you put in is the last place to come back out because it’s the furthest away, really a battery should of been designed with the input and outputs at opposite ends then the oldest stored energy would always be used first, which would decay a battery over time, and heat destroys a battery, positive energy causes heat/ NEGATIVE energy causes freeze it runs cold also preserving batter life.

  9. Ali Naqvi on November 25, 2020 at 9:28 pm

    I always like to take the daily charge into consideration when comparing costs. The average daily standing charge for electricity is about 23p per day. Please do remember to factor these into your projections.

  10. 2wheelspy on November 25, 2020 at 9:29 pm

    Battery’s are double the price they need to be to get interested. The big question is, why are they so much more expensive here compared to the US?

  11. double ooh 7 on November 25, 2020 at 9:46 pm

    it’s obvious if you charge it at night on the cheaper tariff and use the battery during the day it’s essentially useing the night tariff during the day , then just paying for night tariff at night, it’ll save money

  12. s000muk on November 25, 2020 at 9:51 pm

    Just wanted to say I used your octopus Energy referral link as a thank you for all the content you provide

  13. Richard Phillips on November 25, 2020 at 9:52 pm

    Please leave the data captions on screen long enough for us to read them! They contained some useful information.

  14. Chris Hill on November 25, 2020 at 9:52 pm

    I only have a 5 kWh battery and have stopped charging it on the economy 7 tariff mainly because the losses are out weighing what I’m saving. That’s this time of year anyway
    This might change during the months in winter when solar generation is terrible. I also found when I was trying to predict how much sun there was going to be that I was overcharging the battery which led to not leaving enough capacity in the battery’s to absorb any excess from solar.

  15. Cog Nisant on November 25, 2020 at 10:04 pm

    The calculations are a lot more complex than you assume for the battery + solar setup. The summer/winter split in solar output means you will usually be exporting some kw in the summer because the battery will reach 100% and unless you have an electric car that excess will be exported to the grid. Also in winter the house costs will be higher and one Powerwall may not be enough to supply the house all day.

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