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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthordereke
    • CommentTimeSep 3rd 2020
    @WillInAberdeen If you are looking for maximum environmental benefit for the £ then it might be worth looking at https://rippleenergy.com.

    They sell shares in a wind farm which you can use to offset your bills. I've no connection with them other than it seems like a good idea and I think I'll join it at some point.
    • CommentAuthorRobinB
    • CommentTimeSep 3rd 2020 edited
    Gavin from Leeds Solar installed our PV panels and solar thermal almost 10 years ago. We are still happy with both installations and grateful to him for working into the night to get our PV up to meet a feed in tariff deadline! http://robinbuildsanest.blogspot.com/

    On the investment side, if/when I have money to spare I'm looking at Abundance particularly this https://www.abundanceinvestment.com/invest-now/warrington-2025 but then I know next to nothing about investment.
    • CommentAuthorphiledge
    • CommentTimeSep 3rd 2020
    The link to Abundance is to "invest" in warrington councils planned green initiatives, paying an annual return of 1.2%. Given that Abundance also offer lots of commercial green/ethical investment opportunities typically paying 5-10% PA, I'd cynically say this is more of a donation to the council.
    • CommentAuthorjamesingram
    • CommentTimeSep 9th 2020 edited
    Here's a basic go at the numbers
    Simple 4kW system generates 3800kWh per year in Manchester
    Cost £4.5k
    10 years without issues, which can be common = 38000kwh
    11p per kW over the term.
    export meter gives you 4-5p per kWh (edit see below)
    average import tariffs around 15p kWh
    • CommentTimeSep 9th 2020
    I wouldn't hope for exports much over say 5p/kWh for a new installation.


    • CommentAuthorjamesingram
    • CommentTimeSep 9th 2020 edited
    Argh, I thought they'd brought in that buy back thing in to match import!
    I'll check it out.
    yes not as good as I presumed , been keeping my head down last few months (year or two) so I'm out of date :bigsmile:

    Thanks James!

    I was looking at similar numbers, about £5k for 4kW of panels inverter etc so ~£1250/kW

    I'd add this onto the mortgage and the repayment works out costing us ~11p per kWh generated, as you found.

    However we don't use a lot of electricity in the daytime (deliberately) (except in winter) so most of our generation would be exported, bringing in 5p/kWh, so quite a financial loss.

    We could shift some load into the daytime by running washing machine, dishwasher etc. They usually run overnight, so cost ~8-10p kWh (or they will once Covid allows our smart meter install). So paying 11p/kWh for solar would cost a bit more. Ditto for charging an EV when we get one.

    We could use an immersion diverter to heat DHW. Currently this is heated by an oil boiler (4p/kWh now, 8p a few years ago). In future this will probably be on overnight tariff with an ashp (~3p/kWh of heat). Again, paying 11p/kWh to do that with PV costs us extra, and immersions cause more GHG emissions than ASHPs.

    Alternatively, I was looking at participating in a commercial solar farm fund, costing around £850/kW, so they can get me more GHG reductions for less cost. Their income stream covers the interest of raising my mortgage, so might make a few pennies surplus rather than lose them, who knows.

    (Usual disclaimer: don't take investment advice from me, if I knew anything about finance I wouldn't be here, my home is at risk if I borrow against it to invest in PV panels, whatever goes up must eventually come down, etc etc etc)
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