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  • FIRST POST
    • Martyn1981
    • By Martyn1981 5th Dec 16, 2:57 PM
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    Martyn1981
    On-grid domestic battery storage
    • #1
    • 5th Dec 16, 2:57 PM
    On-grid domestic battery storage 5th Dec 16 at 2:57 PM
    Hello!

    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 20
    • Martyn1981
    • By Martyn1981 28th Jul 18, 4:03 PM
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    Martyn1981
    I too would be willing to invest in a battery system for purely environmental reasons, provided I can see that it will wash its own face financially. I just can't see that we are anywhere near at the moment and I see no pressure to move in order to 'prime the pumps' - electric car production will force the battery prices down rapidly.
    Originally posted by orrery
    I think you've summed it up perfectly. Playing Devil's advocate I can point to PV + storage reducing FF leccy generation in the evening when the grid has the highest CO2 levels, but Savvy has nailed that issue by pointing out that other green investments are possible.

    I commend anyone getting a battery for environmental reasons and helping to prime the pump, but unlike my steadfast support for PV, I'm not as concerned about batts as EV's will now, without any doubt whatsoever, drive up demand and supply massively, so we don't need to tinker.

    That said, I can see how a joint venture between the DNO's and pro-sumers (producer/consumers) like us could have financial benefits for everyone, so keep my fingers crossed for more (and better) offerings.

    But ...... I really want a battery to play with!
    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.
    • orrery
    • By orrery 28th Jul 18, 4:23 PM
    • 615 Posts
    • 532 Thanks
    orrery
    That said, I can see how a joint venture between the DNO's and pro-sumers (producer/consumers) like us could have financial benefits for everyone, so keep my fingers crossed for more (and better) offerings.

    But ...... I really want a battery to play with!
    Originally posted by Martyn1981

    Oh, me too. I think that I'd like to see 3kW discharge though - with washing machines and dishwashers and kettles taking 2.2kW and a level of background for the house, I'd say that was a minimum.


    Similarly, the graphs (which were very helpful) we have seen recently indicate the need for a charge level of 3kW too - again that for me (with a 4kWp PV system), less the background consumption, would seem the minimum.


    Further, with 3kW charge rate and economy 7, the ideal battery capacity would seem to be at least 21kWh minimum - roughly the same figure would be indicated for sinking (almost) a full day's PV generation.


    Sounds expensive.
    4kWp, Panels: 16 Hyundai HIS250MG, Inverter: SMA Sunny Boy 4000TL, SolarImmersion
    Location: Bedford, Roof: South East facing, 20 degree pitch
    Nissan Leaf, TADO Central Heating control
    • Coastalwatch
    • By Coastalwatch 28th Jul 18, 9:18 PM
    • 634 Posts
    • 2,634 Thanks
    Coastalwatch
    That said, I can see how a joint venture between the DNO's and pro-sumers (producer/consumers) like us could have financial benefits for everyone, so keep my fingers crossed for more (and better) offerings.

    But ...... I really want a battery to play with!
    Originally posted by Martyn1981

    Well, I've got a 40 kWh battery on the drive and it's quite capable of delivering all our domestic overnight needs. It can be charged either from solar only or E7, and is capable of discharging back into the house. All we need is a cost effective means of achieving it. Vehicle to grid is all very well but surely by using our excess storage from the car to only run our domestic needs then demand on the grid at peak times would also be reduced!
    East coast, lat 51.97. 8.26kw SSE, 23° pitch + 0.59kw WSW vertical. Nissan Leaf plus one dirty diesel. Still waiting for V2H and home storage to become available at sensible cost.
    • NigeWick
    • By NigeWick 29th Jul 18, 6:37 AM
    • 3,044 Posts
    • 1,377 Thanks
    NigeWick
    The danger here is that those who can't do the sums will be sucked in to make an investment without understanding the basics -
    Originally posted by orrery
    You're ignoring the smugness quotient. I know my PW2 doesn't make sense financially but I like to see how much of my solar it stops going to the grid. And, I can brag about it to anybody who will listen.

    I am quite sure that solar + batteries will be cost effective in a few years and I like to think that as an early adopter, I am doing my bit to help the development of these technologies.

    And lastly, later in the year, Tesla will update hardware & software so that I can go off grid in the unlikely event of a power cut.
    The mind of the bigot is like the pupil of the eye; the more light you pour upon it, the more it will contract.
    Oliver Wendell Holmes
    • Martyn1981
    • By Martyn1981 29th Jul 18, 6:48 AM
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    • 13,846 Thanks
    Martyn1981
    Well, I've got a 40 kWh battery on the drive and it's quite capable of delivering all our domestic overnight needs. It can be charged either from solar only or E7, and is capable of discharging back into the house. All we need is a cost effective means of achieving it. Vehicle to grid is all very well but surely by using our excess storage from the car to only run our domestic needs then demand on the grid at peak times would also be reduced!
    Originally posted by Coastalwatch
    That solves the problem especially if we can get an all encompassing energy policy to make best use of it.

    If say, my house is generating and pumping out to the grid (no batts) but you are in work and the car is plugged into a smart charger and told to make use of cheap excess daytime leccy, then you charge up at a good price, then discharge in the evening.

    Between us all, the excesses from RE can be managed, and the shortfalls in supply / peaks in demand can be addressed too.

    All in all, I think things are looking really good and nothing too complicated is needed. The chargers will need to be intelligent, but how hard can that be, so the only 'problem' is persuading folk to buy massive expensive batteries, but that's going to happen as a natural shift to EV's anyway.

    The future in this area is looking extremely positive.

    BTW, for an 'about' 100% RE future leccy grid with higher demand (electrification of cars and heating) the UK will need about 500GWh of leccy storage ...... scary big number ....... or about 10m EV's ..... not so scary now!
    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.
    • orrery
    • By orrery 29th Jul 18, 9:56 AM
    • 615 Posts
    • 532 Thanks
    orrery
    Well, I've got a 40 kWh battery on the drive...
    Originally posted by Coastalwatch

    Well, you might have, but isn't the whole idea of a domestic battery system to store solar energy generated during the day when you are out driving your EV and then using it to charge your EV overnight?
    4kWp, Panels: 16 Hyundai HIS250MG, Inverter: SMA Sunny Boy 4000TL, SolarImmersion
    Location: Bedford, Roof: South East facing, 20 degree pitch
    Nissan Leaf, TADO Central Heating control
    • Coastalwatch
    • By Coastalwatch 29th Jul 18, 11:51 AM
    • 634 Posts
    • 2,634 Thanks
    Coastalwatch
    Well, you might have, but isn't the whole idea of a domestic battery system to store solar energy generated during the day when you are out driving your EV and then using it to charge your EV overnight?
    Originally posted by orrery
    With this being the Green and Ethical section then charging with "cheap" E7 energy when 70% of it is made up of CCGT & Nuclear makes it difficult to reconcile!

    Because of the above I'd never been convinced that EV's were paticularly green. It was only when it dawned upon me that we could make one so by charging totally from a Solar system installed on our property that we made the decision to go down that route.

    Being fortunate in that we can charge our EV (or a storage battery if we had one) on 100% green solar energy during daytime hours then charging by alternate means, be it E7 or otherwise comes a very poor second. I appreciate that if you need the EV for work and away from home all day then what I'm advocating may not be plausible.

    We all have differing lifestyles and goals. I merely made the point that for us our EV could fill more than it's original purpose and that V2G may not suit everyone.
    East coast, lat 51.97. 8.26kw SSE, 23° pitch + 0.59kw WSW vertical. Nissan Leaf plus one dirty diesel. Still waiting for V2H and home storage to become available at sensible cost.
    • ASavvyBuyer
    • By ASavvyBuyer 29th Jul 18, 12:37 PM
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    • 3,058 Thanks
    ASavvyBuyer
    With this being the Green and Ethical section then charging with "cheap" E7 energy when 70% of it is made up of CCGT & Nuclear makes it difficult to reconcile!

    Because of the above I'd never been convinced that EV's were paticularly green. It was only when it dawned upon me that we could make one so by charging totally from a Solar system installed on our property that we made the decision to go down that route.
    Originally posted by Coastalwatch
    I found this site that shows the different % and GW of each source. If you place a cursor over the graph for the last day it can show what is is for each half hour.

    For example, at the moment, renewable energy is providing more than any other source to meet the demand.
    Rhondda Cynon Taf, 4kWp, W roof, 30° pitch, 16 x 8.33 Eternity 250w E+10 panels, Solar Edge SE4000-16A Inverter + P300 Optimisers. Inst Aug 2015.
    REUK Diverter, Toshiba RAS-10G2KVP-E Ultra High Efficiency Air Conditioner/Heat Pump, Kia Soul EV & 100% Green Electric Tariff.
    • orrery
    • By orrery 29th Jul 18, 1:31 PM
    • 615 Posts
    • 532 Thanks
    orrery
    It was only when it dawned upon me that we could make one so by charging totally from a Solar system installed on our property that we made the decision to go down that route.
    Originally posted by Coastalwatch

    I'm glad that you've achieved such a thing - most people would find that impossible.


    In the depths of winter a typical 4kWp system would generate less than 3kWh per day, with much of that going on the house background usage - so no real surplus for charging a car. Even in full summer, a 'typical' mixed cloudy/clear day would make it difficult to get 100% solar into the car (without spending even more money on a clever charger) and even that assumes that the EV is sat in the drive waiting to be charged during the day when most people would be heading out to drive their cars.


    For most people with PV and an electric car, the "I charge my car from solar" is simply an aspiration which can't be supported by the data. For me E7 is far more sensible, using the PV to offset the background usage on peak rate, and subscribing to a renewable-only tariff.
    4kWp, Panels: 16 Hyundai HIS250MG, Inverter: SMA Sunny Boy 4000TL, SolarImmersion
    Location: Bedford, Roof: South East facing, 20 degree pitch
    Nissan Leaf, TADO Central Heating control
    • Coastalwatch
    • By Coastalwatch 29th Jul 18, 3:17 PM
    • 634 Posts
    • 2,634 Thanks
    Coastalwatch
    I'm glad that you've achieved such a thing - most people would find that impossible.
    For most people with PV and an electric car, the "I charge my car from solar" is simply an aspiration which can't be supported by the data. For me E7 is far more sensible, using the PV to offset the background usage on peak rate, and subscribing to a renewable-only tariff.
    Originally posted by orrery
    Hi Orrery, that's quite understandable and well done in subscribing to the renewable tariff only. We've still to make that change but will take a fresh look at it when our fixed tariff ends in December.


    Sadly there's no one size fits all!


    At least we have renewable energy and the Nissan Leaf in common.
    East coast, lat 51.97. 8.26kw SSE, 23° pitch + 0.59kw WSW vertical. Nissan Leaf plus one dirty diesel. Still waiting for V2H and home storage to become available at sensible cost.
    • JKenH
    • By JKenH 29th Jul 18, 4:03 PM
    • 568 Posts
    • 2,448 Thanks
    JKenH
    You're ignoring the smugness quotient. I know my PW2 doesn't make sense financially but I like to see how much of my solar it stops going to the grid. And, I can brag about it to anybody who will listen.

    I am quite sure that solar + batteries will be cost effective in a few years and I like to think that as an early adopter, I am doing my bit to help the development of these technologies.
    Originally posted by NigeWick
    I agree. I may be wrong but I imagine most of us on this forum are blokes and we like our tech and by not having a battery, some fancy graphs and other data to play with you are missing out on some of the fun. Come on, use a bit of man maths and you can justify to yourself that you need a battery just like I have done.

    Last year I used man maths to justify ordering a new Golf GTE (PHEV) as I was being offered a great deal but having waited 8 months for delivery I scrubbed that and bought a 2016 Golf tdi and splashed the rest of what I would be spending on my new solar panels and battery - again applying man maths.

    We all make decisions and like to be able to justify our rationale to our peers and critics. It is hard for the minority of us who have committed to batteries to justify why we have become early adopters to the battery doubters.

    I decided to get a battery at the same time as panels because I thought it would save a few bob on VAT and maybe installation, and because I wanted one. I also thought that Gridshare might work.

    I don t actually know exactly how much my battery cost as it was part of a system. If someone can tell me how much a 7.8 kw system (26 x 300w mono panels) on two roofs with 2 inverters and IBoost should cost then I can work out the true cost of the battery.

    I re-read the Moixa blurb and if you sign up to Gridshare you get unlimited warranty and the batteries I am told are replaced when they fall to 70% (of what I am not too sure). If Gridshare takes off and Moixa are making good profit selling surplus energy to the grid then it is in their interests to replace the batteries with more efficient ones. So hopefully that removes the argument regarding degradation.

    My man maths projects a return/saving of £200 pa from the battery for the first 3 years with hopefully more to come from the profit share. If Moixa stay in business and the warranty is honoured then I should be ok.

    I might have got it wrong but at least I have a new toy to play with.
    Last edited by JKenH; 29-07-2018 at 4:28 PM. Reason: Correction
    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
    • JKenH
    • By JKenH 29th Jul 18, 5:53 PM
    • 568 Posts
    • 2,448 Thanks
    JKenH
    Oh, me too. I think that I'd like to see 3kW discharge though - with washing machines and dishwashers and kettles taking 2.2kW and a level of background for the house, I'd say that was a minimum.


    Similarly, the graphs (which were very helpful) we have seen recently indicate the need for a charge level of 3kW too - again that for me (with a 4kWp PV system), less the background consumption, would seem the minimum.


    Further, with 3kW charge rate and economy 7, the ideal battery capacity would seem to be at least 21kWh minimum - roughly the same figure would be indicated for sinking (almost) a full day's PV generation.


    Sounds expensive.
    Originally posted by orrery
    When I first started looking at Solar and batteries I thought a massive battery would be a great idea. However the reality is that if you are going to charge it from solar you will end up with far more energy stored than you can use in summer and unable to generate enough to fill the battery anywhere near your needs in winter.

    I would suggest you base your battery around what spare generation you have in February, March, September and October. I have a 7.8kwp and am nowhere near filling the battery on this so far gloomy day.

    I can see that I will be charging it from Economy7 in the winter.
    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
    • Martyn1981
    • By Martyn1981 30th Jul 18, 5:35 AM
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    • 13,846 Thanks
    Martyn1981
    I would suggest you base your battery around what spare generation you have in February, March, September and October. I have a 7.8kwp and am nowhere near filling the battery on this so far gloomy day.
    Originally posted by JKenH
    Yep, that's exactly what my position was, but I've changed my view now looking forward as a battery that could hold enough to charge an EV each day, say 20-40 miles per day in the summer, and hold a days worth of E7 for the winter, now seems to make more sense. Also some capacity for a few extra ASHP kWh's for the spring/autumn months.

    Still mentally revising what's best, but now think 10+ kWh's rather than 4-5kWh's (useable) would be a better figure.

    I'm hoping / expecting that prices and options will improve from 2020 onwards!
    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.
    • ASavvyBuyer
    • By ASavvyBuyer 31st Jul 18, 9:18 AM
    • 1,030 Posts
    • 3,058 Thanks
    ASavvyBuyer
    I don t actually know exactly how much my battery cost as it was part of a system. If someone can tell me how much a 7.8 kw system (26 x 300w mono panels) on two roofs with 2 inverters and IBoost should cost then I can work out the true cost of the battery.
    Originally posted by JKenH
    From what others have said they have paid for a similar size solar PV system without batteries, I would estimate between £8-10k.
    Rhondda Cynon Taf, 4kWp, W roof, 30° pitch, 16 x 8.33 Eternity 250w E+10 panels, Solar Edge SE4000-16A Inverter + P300 Optimisers. Inst Aug 2015.
    REUK Diverter, Toshiba RAS-10G2KVP-E Ultra High Efficiency Air Conditioner/Heat Pump, Kia Soul EV & 100% Green Electric Tariff.
    • ASavvyBuyer
    • By ASavvyBuyer 31st Jul 18, 9:39 AM
    • 1,030 Posts
    • 3,058 Thanks
    ASavvyBuyer
    I have started researching EV's & PHEV's for when we change our clean diesel car in the next couple of years. Had a look at a few yesterday to assess size, range, etc.

    In one of the reviews I found for the new Nissan Leaf it mentions: "Other green features include vehicle-to-grid (V2G) connectivity for all new Leafs, which opens up the possibility of using the Nissan as a portable energy storage unit for peak demand, and/or selling power back to the grid."

    Also found this when looking up info for the new Nissan Leaf:

    "Vehicle-to-Grid (V2G) technology combines two-way charging allowing electric vehicles to be fully integrated into the electricity grid. It helps improve the capability to handle non-programmable renewable energy flows, making renewable sources even more widely integrated and affordable. The system works by allowing Nissan EV owners to connect to the grid to play an active role in grid services, while providing the opportunity for an alternate source of income. Once scaled up, the V2G technology will be a game-changer for owners of Nissan electric vehicles as they become active participants in the energy market."

    For those that already have a new Nissan Leaf, is V2G/V2H already available, or have you been told when it will be available to use in the UK?
    Rhondda Cynon Taf, 4kWp, W roof, 30° pitch, 16 x 8.33 Eternity 250w E+10 panels, Solar Edge SE4000-16A Inverter + P300 Optimisers. Inst Aug 2015.
    REUK Diverter, Toshiba RAS-10G2KVP-E Ultra High Efficiency Air Conditioner/Heat Pump, Kia Soul EV & 100% Green Electric Tariff.
    • Coastalwatch
    • By Coastalwatch 31st Jul 18, 10:38 AM
    • 634 Posts
    • 2,634 Thanks
    Coastalwatch
    I have started researching EV's & PHEV's for when we change our clean diesel car in the next couple of years. Had a look at a few yesterday to assess size, range, etc.

    In one of the reviews I found for the new Nissan Leaf it mentions: "Other green features include vehicle-to-grid (V2G) connectivity for all new Leafs, which opens up the possibility of using the Nissan as a portable energy storage unit for peak demand, and/or selling power back to the grid."



    Also found this when looking up info for the new Nissan Leaf:

    "Vehicle-to-Grid (V2G) technology combines two-way charging allowing electric vehicles to be fully integrated into the electricity grid. It helps improve the capability to handle non-programmable renewable energy flows, making renewable sources even more widely integrated and affordable. The system works by allowing Nissan EV owners to connect to the grid to play an active role in grid services, while providing the opportunity for an alternate source of income. Once scaled up, the V2G technology will be a game-changer for owners of Nissan electric vehicles as they become active participants in the energy market."

    For those that already have a new Nissan Leaf, is V2G/V2H already available, or have you been told when it will be available to use in the UK?
    Originally posted by ASavvyBuyer
    Hi ASB, the V2G aspect and range of the new Leaf were the two main reasons we went for one. Unfortunately the V2G aspect is not yet available although OVO are currently seeking participants to take part in a trial for this. I believe it includes a free installation, those already with solar can be included although you may need to be an OVO customer. They also require your post code so it may just be a regional trial! Maybe worth checking out!
    https://www.ovoenergy.com/electric-cars/vehicle-to-grid-charger
    Personally I merely require V2H as opposed to V2G so not sure if I wish expose my new car to it, although I understand it is being conducted with Nissans approval regarding battery lifetime and warranty.
    East coast, lat 51.97. 8.26kw SSE, 23° pitch + 0.59kw WSW vertical. Nissan Leaf plus one dirty diesel. Still waiting for V2H and home storage to become available at sensible cost.
    • gefnew
    • By gefnew 31st Jul 18, 10:42 AM
    • 152 Posts
    • 155 Thanks
    gefnew
    Hi Savvy
    This link maybe of interest.
    https://www.drive-electric.co.uk/driveelectric-launches-vehicle-grid-charging-service-uk-homes-workplaces/
    Regards
    gefnew
    • gefnew
    • By gefnew 31st Jul 18, 12:07 PM
    • 152 Posts
    • 155 Thanks
    gefnew
    Hi Savvy
    On a side note a smets2 smart meter will help as this does import as well as export in real time.
    • Dave Fowler
    • By Dave Fowler 31st Jul 18, 12:28 PM
    • 511 Posts
    • 911 Thanks
    Dave Fowler
    V2G car ownership
    A point to take into consideration is that every charge / discharge cycle for the battery slowly reduces its capacity, particularly if the discharge cycle is deep.

    If you are using the car as a battery store then you need to consider what effect the daily charging cycle will have. If replacing a stand-alone battery is required every 5 years, it is likely the car battery will not be in a good condition after a similar length of time. What will be the effect on the car battery and the selling price of a 5 year old car which has been used as a V2G source?


    Dave F
    Solar PV System 1: 2.96kWp South+8 degrees. Roof 38 degrees. 'Normal' system
    Solar PV System 2: 3.00kWp South-4 degrees. Roof 28 degrees. SolarEdge system
    EV car
    Location: Bedfordshire
    • ASavvyBuyer
    • By ASavvyBuyer 31st Jul 18, 1:04 PM
    • 1,030 Posts
    • 3,058 Thanks
    ASavvyBuyer
    Hi ASB, the V2G aspect and range of the new Leaf were the two main reasons we went for one. Unfortunately the V2G aspect is not yet available although OVO are currently seeking participants to take part in a trial for this. I believe it includes a free installation, those already with solar can be included although you may need to be an OVO customer. They also require your post code so it may just be a regional trial! Maybe worth checking out!
    https://www.ovoenergy.com/electric-cars/vehicle-to-grid-charger
    Personally I merely require V2H as opposed to V2G so not sure if I wish expose my new car to it, although I understand it is being conducted with Nissans approval regarding battery lifetime and warranty.
    Originally posted by Coastalwatch
    Thanks for the link; very interesting. However, same as you, I would only really be interested in V2H so that I had some control over how much of the car storage was being used. Mainly to cover evening and overnight low use, and to stop importing when a cloud comes across when the washing machine is on.

    Also, I may have misunderstood the figures, but it appears that OVO would charge you at normal rate to charge up the car, but only pay you about half of that when they export power from your car battery (and as Dave says, shortening the life of the battery).
    Last edited by ASavvyBuyer; 31-07-2018 at 1:05 PM. Reason: typo
    Rhondda Cynon Taf, 4kWp, W roof, 30° pitch, 16 x 8.33 Eternity 250w E+10 panels, Solar Edge SE4000-16A Inverter + P300 Optimisers. Inst Aug 2015.
    REUK Diverter, Toshiba RAS-10G2KVP-E Ultra High Efficiency Air Conditioner/Heat Pump, Kia Soul EV & 100% Green Electric Tariff.
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