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"Looking for a PV and EV solution"

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  • JKenH
    JKenH Posts: 5,117 Forumite
    Sixth Anniversary 1,000 Posts Name Dropper
    Sorry if drifting off topic a bit but I tried the battery route and it didn’t work for me. My PVGIS daily target for March is 16.5 kwh. I am using virtually all of that with typically 6-8 kwh going into the Iboost and the ASHP running at about 400 watts.

    I think any hot water diversion device gives a great return on investment. If you can send 1500kwh to the hot water tank you can virtually pay for the IBoost in not much more than 12 months or a couple of years if on E7.

    The ASHP cost me £1100 and has dramatically reduced the amount of time our oil fired central heating is running. This time of year I can run it for about 7 hours on solar, just turning it off for a few minutes if I want to use the kettle or cooker. Last year I spent £1000 on oil and if, as I hope, I can save £200 per annum payback will be 5.5 years and I should get free aircon in the summer.

    I believe these two technologies give a far better return than a battery.
    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)
  • mgbond
    mgbond Posts: 86 Forumite
    Could you not use the IBoost to kind of do this (not as good but possible). IBoost has two outputs so once Emersion is hot the second cloud supply the EV socket. You can also set each channel on a timer.
    6kWp system, 20 x 300W Longi Solar panels with a Solis 6.0 inverter + Wifi and iBoost
    22deg pitch East to west 12 panels on the East and 8 on the West
  • 1961Nick
    1961Nick Posts: 2,107 Forumite
    Tenth Anniversary 1,000 Posts Name Dropper
    Hi Nick and thanks for your thoughts on ASHP already installed.
    It is a hot water system I need to install next and I'm struggling to decide which might be the most appropriate option. From my limited understanding this appears to be between three. An indirect immersion tank requiring a pumped hot and cold supply to the shower in order to supply equal pressure to each. A direct unvented immersion tank requiring an expansion tank, drain to outside plus annual service and the third, a heat store.The latter appearing to be a costly alternative commencing around £1500 plus installation, unless I can be advised otherwise! Not that I've any knowledge of how one might perform or whether it might adequately fill a bath with some to spare!
    Any thoughts on the above will be most appreciated.
    I think I'd go for an iBoost on your existing (vented?) system with a longer heating element if you want to maximise it's potential.
    4kWp (black/black) - Sofar Inverter - SSE(141°) - 30° pitch - North Lincs
    Installed June 2013 - PVGIS = 3400
    Sofar ME3000SP Inverter & 5 x Pylontech US2000B Plus & 3 x US2000C Batteries - 19.2kWh
  • mgbond
    mgbond Posts: 86 Forumite
    Yep. I fitted a 36” element in a 140ltr tank. Yesterday it heated the lot.
    6kWp system, 20 x 300W Longi Solar panels with a Solis 6.0 inverter + Wifi and iBoost
    22deg pitch East to west 12 panels on the East and 8 on the West
  • zeupater
    zeupater Posts: 5,389 Forumite
    Part of the Furniture 1,000 Posts Name Dropper Combo Breaker
    Hi Nick and thanks for your thoughts on ASHP already installed.
    It is a hot water system I need to install next and I'm struggling to decide which might be the most appropriate option. From my limited understanding this appears to be between three. An indirect immersion tank requiring a pumped hot and cold supply to the shower in order to supply equal pressure to each. A direct unvented immersion tank requiring an expansion tank, drain to outside plus annual service and the third, a heat store.The latter appearing to be a costly alternative commencing around £1500 plus installation, unless I can be advised otherwise! Not that I've any knowledge of how one might perform or whether it might adequately fill a bath with some to spare!
    Any thoughts on the above will be most appreciated.
    Hi

    Have you considered a large vented DHW cylinder with two immersion heaters or even two linked cylinders with one heater element in each?

    The idea is to prioritise energy either to the to uppermost heater or second (tap side) cylinder and when that reaches the required temperature, use a twin circuit proportional controller to divert the energy to the other heater ... this way you're able to achieve usable DHW temperatures when conditions are relatively poor.

    Remember, whatever solution you do decide on, it's likely that you'll be heating the DHW to higher temperatures than average so carefully consider the option of fitting a whole house TMV at the same time to address the risk of scalding.

    HTH
    Z
    "We are what we repeatedly do, excellence then is not an act, but a habit. " ...... Aristotle
    B)
  • Coastalwatch
    Coastalwatch Posts: 3,580 Forumite
    Seventh Anniversary 1,000 Posts Name Dropper
    zeupater wrote: »
    Hi
    Have you considered a large vented DHW cylinder with two immersion heaters or even two linked cylinders with one heater element in each?
    The idea is to prioritise energy either to the to uppermost heater or second (tap side) cylinder and when that reaches the required temperature, use a twin circuit proportional controller to divert the energy to the other heater ... this way you're able to achieve usable DHW temperatures when conditions are relatively poor.
    Remember, whatever solution you do decide on, it's likely that you'll be heating the DHW to higher temperatures than average so carefully consider the option of fitting a whole house TMV at the same time to address the risk of scalding.
    HTH
    Z
    Thanks for that Zeup, certainly food for thought there. Having experienced problems in the past with differing water pressures, ie mains to header tank, then I'm assuming for a TMV to work satisfactorily the pressures ideally need to be equal between hot and cold. With header tank pressure being limited, hence the need for a pump and presumably feeding both hot and cold water from it to the TMV. I've limited access into the loft and headroom once up there so two tanks may just be the answer!
    East coast, lat 51.97. 8.26kw SSE, 23° pitch + 0.59kw WSW vertical. Nissan Leaf plus Zappi charger and 2 x ASHP's. Givenergy 8.2 & 9.5 kWh batts, 2 x 3 kW ac inverters. Indra V2H . CoCharger Host, Interest in Ripple Energy & Abundance.
  • Coastalwatch
    Coastalwatch Posts: 3,580 Forumite
    Seventh Anniversary 1,000 Posts Name Dropper
    1961Nick wrote: »
    I think I'd go for an iBoost on your existing (vented?) system with a longer heating element if you want to maximise it's potential.
    Hi Nick, thanks again. Sadly no tank at present as hot water presently supplied by the combination gas boiler. I take on board the iBoost and longer heating element thoughts.
    East coast, lat 51.97. 8.26kw SSE, 23° pitch + 0.59kw WSW vertical. Nissan Leaf plus Zappi charger and 2 x ASHP's. Givenergy 8.2 & 9.5 kWh batts, 2 x 3 kW ac inverters. Indra V2H . CoCharger Host, Interest in Ripple Energy & Abundance.
  • Martyn1981 wrote: »
    CW - Just out of curiosity, have you heard of 'rapidgate'?

    It's been noticed this last week that the latest Leaf's, with the 40kWh pack seem to do something 'odd' if you do too many rapid charges in a short period. Some folk have found that by the 3rd (or so) rapid charge on a long journey, the Leaf charges at 22kW not 50kW.


    As I know Nissan already fixed rapid gate issue with a new firmware.
  • EricMears
    EricMears Posts: 3,304 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    Chesheer wrote: »
    As I know Nissan already fixed rapid gate issue with a new firmware.
    That's not absolutely true. The software patch is indeed supposed to improve rapid charging but I hear the process still slows down when % battery is fairly high or if the battery gets hot. Not really a problem for me : since (or indeed before) the patch, I've never needed more than 2 RCs in the same day.
    NE Derbyshire.4kWp S Facing 17.5deg slope (dormer roof).24kWh of Pylontech batteries with Lux controller BEV : Hyundai Ioniq5
  • zeupater
    zeupater Posts: 5,389 Forumite
    Part of the Furniture 1,000 Posts Name Dropper Combo Breaker
    EricMears wrote: »
    That's not absolutely true. The software patch is indeed supposed to improve rapid charging but I hear the process still slows down when % battery is fairly high or if the battery gets hot. Not really a problem for me : since (or indeed before) the patch, I've never needed more than 2 RCs in the same day.
    Hi

    Isn't the fix really just down to Nissan 'relaxing' the battery protection algorithm which is supposed to extend cell life through limiting temperatures, so the patch is simply a trade-off between some new vehicle customers (those with regular high mileage journeys) being really annoyed now, to the same people or subsequent owners being really, really annoyed later ... some kind of customer focussed patch that must be - talk about kicking the can down the road! ... ;)

    HTH
    Z
    "We are what we repeatedly do, excellence then is not an act, but a habit. " ...... Aristotle
    B)
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