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    • Martyn1981
    • By Martyn1981 5th Dec 16, 3:57 PM
    • 6,137Posts
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    On-grid domestic battery storage
    • #1
    • 5th Dec 16, 3:57 PM
    On-grid domestic battery storage 5th Dec 16 at 3:57 PM

    Right, as discussed elsewhere, battery storage for self generation (typically PV) is interesting (to some), and gathering momentum in the UK. So here's a thread to discuss it, and watch it develop.

    I've called it on-grid, as off-grid is so much more specialised. And domestic as commercial scale storage, or grid scale can be chatted about on the Green & Ethical energy issues thread.

    So, where are, well this article lists about 20 systems that are available or should be available soon:-

    Introducing CleanTechnica’s New Home Battery Overview Page

    Jumping straight in with personal opinions:-

    Economical - Not yet. Prices are falling fast, the range of products is expanding fast, and large numbers are being deployed in some countries, either because the price of leccy is high (Australia & Hawaii) or because subsidy schemes exist (Sweden & Germany).

    Where are we today. My needs are a 4kWh system. That's 4kWh of useable capacity, which would mean about 8kWh of lead acid (LA), or about 5kWh of lithium ion (Li-ion). My research has found batts in the high £2k and up range. I need the price to be nearer to £1.5k.

    The Tesla Powerwall II, installed is approx £6.5k, which works out at about £2.2k for 5kWh, but of course, it doesn't work quite like that, as smaller systems will cost proportionately more.

    Environmental - Tricky one this (to say the least). Until storage is needed, it's not environmental. Renewable energy (RE) generation currently displaces gas generation, which is a demand follower. Once gas generation is pushed down to zero (at times) we need storage, but we aren't there yet.

    However, to push gas generation down to zero, we need more RE, and to ensure it is viable/economic/profitable, we will need storage - chicken and egg situation.

    The advantage of storage to the environment, is to take peaks of RE and timeshift them to peaks in electricity demand. On a domestic level, this works quite well as PV generates during the day into the afternoon (or evening) depending on the month, so any stored leccy is available for the evening peak 5pm to 7pm.

    That's the background, and now here's a thread to discuss options, prices, economics, and watch things unfold. Enjoy.
    Mart. Cardiff. 5.58 kWp PV systems (3.58 ESE & 2.0 WNW)

    For general PV advice please see the PV FAQ thread on the Green & Ethical Board.
Page 15
    • Martyn1981
    • By Martyn1981 10th Nov 17, 2:46 PM
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    Buy your own battery but get £50 pa from Moixa?

    Moixa moves to aggregate third party batteries with new government funding

    Home battery storage company Moixa is to expand its GridShare aggregation platform to include third party units for the first time after securing over £250,000 from the UK government.

    The company was awarded £267,750 from the Department for Business, Energy and Industrial Strategy’s Energy Entrepreneurs Fund to expand the platform to a wider range of batteries outside of its own units.

    GridShare aggregates the capacity of multiple distributed batteries to create a virtual power plant, which is intended to deliver services on demand to the national grid, local electricity networks and utilities.

    In return, participating households are supplemented with an annual income of £50 on top of the savings provided by the battery itself. Until now, this platform has only been used on Moixa’s own batteries, with the company supporting its work with additional patent protection on aggregating smart batteries across multiple homes to provide services to the grid

    Here's a link to Gridshare, and the income paragraph, though it looks like it needs updating:

    How Much Can I Earn Selling Electricity?

    Depending on the type of battery you own you should be able to choose between a “Fixed Income” or “Profit Share” membership.

    A Fixed Income membership earns you £50 a year, guaranteed; however this is only available to owners of Moixa-branded batteries.

    A Profit Share membership will pay out 50% of the profits generated by your Smart Battery system. This is available to both owners of Moixa-branded batteries as well as batteries manufactured by one of our approved partners.

    Earnings from both memberships will be paid annually.
    Last edited by Martyn1981; 10-11-2017 at 2:49 PM.
    Mart. Cardiff. 5.58 kWp PV systems (3.58 ESE & 2.0 WNW)

    For general PV advice please see the PV FAQ thread on the Green & Ethical Board.
    • Martyn1981
    • By Martyn1981 14th Nov 17, 10:56 AM
    • 6,137 Posts
    • 10,259 Thanks

    However, after a better look at the relevant bit of the prog plus some strategic Googling I managed to find out that was actually a on vanadium redox flow system sold by Red T Energy. They have a website with lots of pretty pictures but manage to avoid giving any details of cost.
    Originally posted by EricMears
    More news on RedT and storage systems.

    1MWh flow machine to save business 50% on grid imports by time shifting solar

    What is thought to be the largest operating containerised vanadium redox flow machine system in the UK has been connected to the to the grid by redT energy, with the 1MWh project expected to cut a Cornish business’ reliance on grid imports in half by time shifting excess solar generation.

    The system from redT energy has been installed at The Olde House, a 600 acre working farm and holiday retreat situated in north Cornwall, which also has two small solar arrays with a combined capacity of 350kWp.

    The project will shift the excess generation from these installations to use during evening peak times around the site, which is expected to save The Olde House up to 50% on grid imports during these periods.

    It will also create revenue by tracking and dynamically responding to changes in grid frequency and providing grid services, while also aiming to participate in the Capacity Market.

    RedT expects this type of project to achieve an internal rate of return (IRR) percentage in the mid-teens.
    Mart. Cardiff. 5.58 kWp PV systems (3.58 ESE & 2.0 WNW)

    For general PV advice please see the PV FAQ thread on the Green & Ethical Board.
    • Martyn1981
    • By Martyn1981 16th Nov 17, 3:18 PM
    • 6,137 Posts
    • 10,259 Thanks
    Centrica preparing to roll out solar-plus-storage in Cornwall

    The goal of the project, as with the rest of Centrica’s activities in Cornwall, is to harness renewables and smart energy technologies to free up capacity on the local grid and provide flexibility to the distribution network operator or the national grid.

    "With the residential [batteries] we'll be looking at the fleet of residential sites and how with aggregation we might access some of those national and potentially local services,” Orme said.
    Mart. Cardiff. 5.58 kWp PV systems (3.58 ESE & 2.0 WNW)

    For general PV advice please see the PV FAQ thread on the Green & Ethical Board.
    • Martyn1981
    • By Martyn1981 6th Dec 17, 11:56 AM
    • 6,137 Posts
    • 10,259 Thanks
    Ffu 15 + 16
    Forgot to post October's results, so here's a double dose. Also getting close to a year and some 12 month analysis.

    [Doh! Nearly copied directly from e-mail, which got my IP banned last time, due to a 'quirk' in the MSE protection software - so just a reminder to one and all that this issue exists, and to copy/paste to notepad first. M.]

    October -

    Electricity imported - 188kWh (227kWh in Oct 2016)
    Generated - 143kWh (149kWh in Oct 2016)
    Battery discharge - 77kWh
    ImmerSUN diversion - 8.7kWh (28.7kWh in Oct 2016)

    So, similar amount of solar PV generation, a lower bill by about 50kWh with 77kWh out of the battery, so it's had an impact - also can see the ImmerSUN is taking a big hit now, it lost 20kWh vs this month last year...

    Here are my November sums:

    Electricity imported - 263kWh (256kWh in Nov 2016) - I've imported higher than that though in 2015 - 297kWh
    Generated - 93kWh ( 85kWh in Nov 2016) - my highest ever November generation

    Battery discharge - 42.9kWh
    ImmerSUN diversion - 4.1kWh (19kWh in Nov 2016) - even worse than the 9kWh from Nov 2015!

    So 11 and a bit months in, I've discharged 860kWh out of the battery, saving me approx £155 in imported electricity this year.

    My electricity consumption to beginning of Dec is 1788kWh vs 2168kWh last year. So actually this year I've probably used more electricity than I did last year and still managed to reduce my bill because of the battery. Several reasons for this - both of us work from home more now, and the kids are definitely using the PS4 way more than we did last year!

    Will I get to 1000kWh discharged for the year? No.
    Have I reduced my electricity bill - yes.
    Will I "break even" any time soon? - No.
    Have I learned stuff - yes!
    Mart. Cardiff. 5.58 kWp PV systems (3.58 ESE & 2.0 WNW)

    For general PV advice please see the PV FAQ thread on the Green & Ethical Board.
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