Batteries are they worth it...

Hi, I am trying to get quotes for solar panels. So far only one company has responded.

They have quoted with a battery and one without. The system with the battery is roughly 10k and the one without is roughly 6k.

Is the extra for a battery worth it?

We spend a lot of time at home during the day at the moment due to working from home.

Thank you
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Comments

  • QrizB
    QrizB Posts: 13,822 Forumite
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    If the goal is to minimise your use of grid electricity, batteries are a useful addition to solar PV. With an appropriately-sized array and battery you can be essentially grid-independent for 6-8 months of the year.
    Financially, the case makes less sense (unless you expect electricity to continue to cost 28p/kWh for the next decade).
    N. Hampshire, he/him. Octopus Go elec & Tracker gas / Shell BB / Lyca mobi. Ripple Kirk Hill member.
    2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 30MWh generated, long-term average 2.6 Os.
    Taking a break, hope to be back eventually.
    Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs.
  • JKenH
    JKenH Posts: 4,778 Forumite
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    The problem with any technology is that it usually gets cheaper over time. That trend however has recently reversed with solar panels and might with batteries. It’s hard to predict the  future but batteries make more sense now than a year ago because electricity prices have risen.

    You need to bear in mind that what you save into your battery is electricity you won’t be exporting so you will lose out on SEG. If you are getting 5p/kWh export, it is effectively costing you around 6p if it goes in your battery because of round trip losses. You might though save 24p/kWh (30p cost from grid less 6p).


    Northern Lincolnshire. 7.8 kWp system, (4.2 kw west facing panels , 3.6 kw east facing), Solis inverters, Solar IBoost water heater, Mitsubishi SRK35ZS-S and SRK20ZS-S Wall Mounted Inverter Heat Pumps, ex Nissan Leaf owner)
  • arty688
    arty688 Posts: 411 Forumite
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    A lot also depends how much electricity you use. Me for example use around 20000kwh per year. So most days I would be charging the battery overnight and discharge before the solar kicks in saving me around £2 per day so say £500 per year ish . On top of that there is the ability to use more generated solar maybe another £500 so £1k per year,

    that Of course is on todays prices a year ago it would have been half that. Next year who knows?
    8kw system spread over 6 roofs , surrounded by trees and in a valley.
  • Guru861
    Guru861 Posts: 6 Forumite
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    Thanks for thoughts. Difficult decision to be made
  • Freepost
    Freepost Posts: 215 Forumite
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    arty688 said:
    So most days I would be charging the battery overnight and discharge before the solar kicks in saving me around £2 per day so say £500 per year ish .
    Hi,

    If you don't mind me jumping in here, how are you saving £2/day?

    Thanks
    F.

  • arty688
    arty688 Posts: 411 Forumite
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    The £2 per day is based on Octopus Go tariff .

    charge 10kwh off peak at 7.5p and the use it at 30.5p saving 23p per kw so £2.30. There are losses so around £2 seemed ok without getting too complicated.
    8kw system spread over 6 roofs , surrounded by trees and in a valley.
  • Sterlingtimes
    Sterlingtimes Posts: 2,390 Forumite
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    arty688 said:
    The £2 per day is based on Octopus Go tariff .

    charge 10kwh off peak at 7.5p and the use it at 30.5p saving 23p per kw so £2.30. There are losses so around £2 seemed ok without getting too complicated.
    Octopus gives "love and power" to electric car owners to use Go, but others would fall back to Octopus Economy 7. A rework is required. Day 29.92. Night 21.39. The saving is not impressive on this basis.
    I have osteoarthritis in my hands so I speak my messages into a microphone using Dragon. Some people make "typos" but I often make "speakos".
  • Chris_Type_R
    Chris_Type_R Posts: 177 Forumite
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    edited 3 April 2022 at 11:24AM
    Adding a battery might be a useful hedge at this point against the possibility of blackouts in the future. I doubt things will get that bad - but often hear from family in South Africa about the load sharing they have had to endure for years. It's difficult for Europe to pivot away from the dependency on gas supply from Russia. 

    Personally I'd be looking at a Victron & Pylontech set up, which can be extended reasonably easily in the future.
    Central Beds, 2.02kWp (9 x 225W) south facing with some morning shade, installed 2011 (£7.16/Wp). Tigo monitoring/optimisers on all panels, Growatt MIC 2000 TL-X Inverter and Solar iBoost installed 2022. (4 x 415W + 6 x 405W garden experiment connected to SunSynk 3.6 hybrid inverter & 2 x 5.3kWh SynSynk batteries) (4 x 405W panels queued to go somewhere)
  • Screwdriva
    Screwdriva Posts: 1,155 Forumite
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    edited 3 April 2022 at 11:43AM
    Guru861 said:
    Hi, I am trying to get quotes for solar panels. So far only one company has responded.

    They have quoted with a battery and one without. The system with the battery is roughly 10k and the one without is roughly 6k.

    Is the extra for a battery worth it?

    We spend a lot of time at home during the day at the moment due to working from home.

    Short answer is, no. Batteries do not make financial sense at this time and probably never will with the advent of vehicle to home charging technology (charge your car during the day and the EV handles your nighttime household requirements). We are only a few years away from being able to go 10 months of the year without using the grid in the UK.

    But rooftop solar definitely does, especially if you WFH and plan on owning an EV in the future. ROI on a system with no Chinese brands (Hyundai panels, Solar Edge inverter, 20 year warranty) are now approaching ~7 years before EV savings are factored in. 
    -  10 x 400w LG + 6 x 550W SHARP BiFacial Panels + SE 3680 HD Wave Inverter + SE Optimizers. SE London.
    -  Triple aspect. (22% ENE/ 33% SSE/ 45% WSW)
    -  Viessmann 200-W on Advanced Weather Comp. (the most efficient gas boiler sold)

    Feel free to DM me if I can help with any energy saving!
  • Meatballs
    Meatballs Posts: 587 Forumite
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    edited 3 April 2022 at 11:39AM
    You can get a small battery setup from £1600

    https://www.itstechnologies.shop/collections/solar-battery-storage-buy-online/products/pylontech-us2000c-2-4kwh-complete-kit-charges-from-solar-octopus-go

    Fitting shouldn't be that expensive fairly simple...

    This is a modular system so you can increase capacity, but you are far more likely to get a good return on a small battery system that you can fully charge/discharge every day (maybe multiple times with solar), over a large capacity system that covers you during winter but doesn't get used to its fullest in summer.

    Solar Facebook groups seem to think battery is instant savings and it's a no brainer but I'm not sure many have run the actual numbers. I think many are addicted to the no grid usage feeling 😅

    Whilst battery storage can make energy use more green it's not as straightforward as you would think. Any excess solar you don't use makes neighbours use more green and reduces overall grid CO2. Using a battery has efficiency losses that decrease this benefit. However charging/discharging at low/high CO2 intensity periods could offset the efficiency losses.
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