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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Renewable Energy: Solar PV-T , whats the lastest ?

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    So only a couple of options out there , anyone got some installed experience or thoughts, advice

    thanks
    • CommentAuthorTriassic
    • CommentTimeJul 9th 2014 edited
     
  3.  
    not looked a VH sys. looking more at newformenergy type panels , there a very small space available on a flat roof section of a listed building so trying to maximise solar options in that space
    • CommentAuthorTriassic
    • CommentTimeJul 18th 2014 edited
     
    Is this the one you're looking at http://www.newformenergy.com/sites/default/files/companyliterature/pv-t-panel-technology-sheet.pdf ?

    I'm looking for something similar but I need to roof integrate mine as I'm in a national park and it needs to be low visual impact.
  5.  
    yes , something like this. Think it might be only one of two options available.

    you can get inroof kits would it suffice to insert these type of panels or do you need solar slate types?
    • CommentAuthorTriassic
    • CommentTimeJul 26th 2014
     
    How about this new thin film BIPVT system-- http://www.greenmaltese.com/2014/06/20/worlds-first-integrated-solar-system-generates-electricity-and-heat/

    Looks a lot like the VH system!
  7.  
    Posted By: TriassicHow about this new thin film BIPVT system

    Looks a lot like the VH system!

    That Aussie system appears to be hybrid PV solar air rather than VIking's PV solar thermal system.
    •  
      CommentAuthorSteamyTea
    • CommentTimeJul 26th 2014 edited
     
    Anyone know the £/MWh price of these systems.

    As a rough comparison and assuming that a 4 kWp PV system costs £6000 with £2000 maintenance costs over 20 years and an ST system costs cost £5000 with £2000 maintenance costs over the same 20 years.
    If the PV can generate 5 MWh/year and the ST 10 MWh/year then the £/MWh will be:
    PV = £80/MWh
    ST = £35/MWh

    Total £115/MWh or 11.5p/kWh which is about the same as the cheapest electricity you can currently get.

    This is purely a rough estimate and does not take into account any grants, payments, inflation (oh how we are looking forward to that again) or the need to change or build a new roof anyway.

    15 MWh is about the same as driving 12,000 miles.
    • CommentAuthorEd Davies
    • CommentTimeJul 26th 2014
     
    Posted By: SteamyTeaPV = £80/MWh
    ST = £35/MWh

    Total £115/MWh or 11.5p/kWh
    Isn't that £115/2MWh or 5.75p/kWh?
  10.  
    Looking at a cost of £350/m2 minus a £100/m2 cost for a roof leaves £250/m2 for the PV-T part.
    The PV yield is about 150-180W/m2 and costs about £150/m2 to install in the factory.
    The Solar Thermal yield is about 500W/m2 but a lot is wasted in the summer because its over-sized for optimal winter heating but it eliminates the need for back-up heating system in a Passive House transforming it into an Energy Plus House with sufficient excess energy to run an electric car.
    It can be installed for a similar cost to a heat pump, stove and a solar thermal hot water system!
    •  
      CommentAuthorSteamyTea
    • CommentTimeJul 26th 2014 edited
     
    Posted By: Ed DaviesIsn't that £115/2MWh or 5.75p/kWh?
    Yes, so works out pretty good really. About the same as E7/gas then.
    • CommentAuthorGarethC
    • CommentTimeJul 28th 2014
     
    Posted By: SteamyTea
    Posted By: Ed DaviesIsn't that £115/2MWh or 5.75p/kWh?
    Yes, so works out pretty good really. About the same as E7/gas then.


    Aagh, head hurting due to simple maths. Still, it's a Monday morning.

    If 1/3 of the energy is being produced at 8p/kWh (PV) and 2/3 of the energy is being produced at 3.5p/kWh (ST), then isn't the average price per kWh actually 1/3*8 + 2/3*3.5 = 5.0p/kWh?
    • CommentAuthorEd Davies
    • CommentTimeJul 28th 2014
     
    I'd actually dispute Steamy's figures - it seems to me that the costs per MWh for solar thermal and PV and much closer but that's assuming a DIY install and looks just at the panel costs. Also 5 MWh/year for a 4 kW system seems to be a bit optimistic but not enough to invalidate the general point. Maybe a reasonable solar thermal system can produce 10 MWh per year (dunno - haven't thought about it in those terms) but a lot of it will be in a few months in summer when much will go to waste (unless it's a huge household). Whatever:

    PV system costs £6000 + £2000 = £8000 over 20 years so £400/year and harvests 5 MWh in that year.
    ST system costs £5000 + £2000 = £7000 over 20 years so £350/year and harvests 10 MWh in that year.

    We'll have one of each please. Total cost for a year £750. Total generation in the year 15 MWh. £50/MWh or 5p/kWh.

    So yep, I agree.

    That £5.75p/kWh figure assumes you have equal amounts of power from each system (e.g., two PV systems and one ST system).
    •  
      CommentAuthorSteamyTea
    • CommentTimeJul 28th 2014
     
    Was just a starting point to see if it is worthwhile.
    Usage can make a huge difference, as can any grants/incentives.

    The other thing that can make a difference is how long someone stays in a property, future energy prices/sources (we could be forced to go all electric as part of greening the grid/lack of interest in fracking) and the general 'popularity' of micro generation (there is some evidence that it can negatively affect property prices).

    But if the overall price is under 10p/kWh, then it is worth considering.
  15.  
    PVGIS estimates that a 4kWp fixed system in Penzance at the optimum inclination and azimuth will produce 4240kWh a year. PV panels will drop about 20% efficiency in 20 years, will they not?

    Basis of the calculations above therefore look rather optimistic....

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