Solar Panel Quote

2

Comments

  • Crowmann
    Crowmann Posts: 136 Forumite
    That roof does not look great for 3.3 Kw system - no doubt it can be done but its far from ideal.

    The 4000 kwh annual generation is wrong - more like 3000 at best.

    Be aware the generation at the times of year you really want it - Autumn / Winter is around a third or less than the warmer months - unless you heat your water via solar or run AC you will hand back most of what you generate from May till Sept.

    Summary : Not worth the bother unless you believe electricity costs are going to rocket.
    16 265w panels South facing, 45 degrees, West Norfolk.
  • zeupater
    zeupater Posts: 5,353
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    Martyn1981 wrote: »
    ... Regarding the roof above your wife, can you use the west facing section too?
    Hi

    If it's semi-detached then access would be required via the neighbours' garden ... could be okay for permission at the moment, but neighbours (& things) change ... I wouldn't do it!

    Anyway, loads of triangles and what looks to be a pretty high price for that size system considering that scaffold etc is already in place ...

    #Note for dancook ... can you measure the roof below the window and let us know ... maybe something like a 5x330W (1.65kWp) system would fit at a push ... much smaller, but easy access (no scaffold) and a single string inverter would make the sums add-up better as well as potentially looking less messy ... also, at that price don't let the scaffold opportunity drive you into a hasty decision, there's probably a suitable solution which would cost less/kWp including scaffolding, so don't get disheartened, you'll find solar to be a great decision in the end ...

    HTH
    Z
    "We are what we repeatedly do, excellence then is not an act, but a habit. " ...... Aristotle
    B)
  • ajbell
    ajbell Posts: 1,151 Forumite
    Keeping your wife on the roof must save a bit.
    4kWp, South facing, 16 x phono solar panels, Solis inverter, Lincolnshire.
  • dancook
    dancook Posts: 26
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    zeupater wrote: »
    Hi

    If it's semi-detached then access would be required via the neighbours' garden ... could be okay for permission at the moment, but neighbours (& things) change ... I wouldn't do it!

    Anyway, loads of triangles and what looks to be a pretty high price for that size system considering that scaffold etc is already in place ...

    #Note for dancook ... can you measure the roof below the window and let us know ... maybe something like a 5x330W (1.65kWp) system would fit at a push ... much smaller, but easy access (no scaffold) and a single string inverter would make the sums add-up better as well as potentially looking less messy ... also, at that price don't let the scaffold opportunity drive you into a hasty decision, there's probably a suitable solution which would cost less/kWp including scaffolding, so don't get disheartened, you'll find solar to be a great decision in the end ...

    HTH
    Z

    There seems to be a push of minimum 3kwh (to make it worthwhile), is it to get the government scheme?

    That roof is 2.24m x 4.7m (pitch 21)
  • dancook
    dancook Posts: 26
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    ajbell wrote: »
    Keeping your wife on the roof must save a bit.

    She requests I leave the window open, we end up losing tons of heat
  • Exiled_Tyke
    Exiled_Tyke Posts: 1,185
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    My 3.3 Kw system is again very 'bitty' across 4 different sections of roof. Some of it S facing and some W. Of course like this proposal it wouldn't be viable without the Solar Edge inverter. I was concerned at first that it would look a mess but it's not really been an issue and is very rarely noticed by visitors. I'm very happy with it (although it doesn't quite meet its generation estimates in the off seasons) and would thoroughly recommend going ahead while you have scaffolding up. An SE system is always going to cost a little more but it would be good to get the price down a little more. And yes the payback figures are without doubt overly optimistic.
    Install 28th Nov 15, 3.3kW, (11x300LG), SolarEdge, SW. W Yorks.
    Install 2: Sept 19, 600W SSE
    Solax 6.3kWh battery
  • zeupater
    zeupater Posts: 5,353
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    edited 30 November 2017 at 10:28PM
    dancook wrote: »
    There seems to be a push of minimum 3kwh (to make it worthwhile), is it to get the government scheme?

    That roof is 2.24m x 4.7m (pitch 21)
    Hi

    Is that sized as ground-space (as per plan view) based on wall dimensions or actual roof surface area including tile overhangs? ...

    For example .. at a push (so you'd need to double-check) you may find an installer who would install something like 6 SunPower X21 345W black panels (1559x1046mm) in landscape (so nominal approx 2.1mx4.7m installed) making a 2.07kWp system - it's really pushing it (especially the measurements are actual roof area) but some installers would push much closer to the edges on lower and more sheltered roofs and canopies ..

    Higher efficiency panels will be more expensive, but it's likely that there's already plenty of fat built into your current quote from info provided ... maybe the installer would simply substitute 11 330/345W panels for the current 300W units for the same price if you're decent at haggling ... that'd push the system close to 3.8kWp which would probably better suit your work-from-home position better ...

    All just food for thought ...

    HTH
    Z
    "We are what we repeatedly do, excellence then is not an act, but a habit. " ...... Aristotle
    B)
  • dancook
    dancook Posts: 26
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    zeupater wrote: »
    Hi

    Is that sized as ground-space (as per plan view) based on wall dimensions or actual roof surface area including tile overhangs? ...

    It's the dimensions the installer put down in the quote, i assume it's actual roof surface area.
  • dancook
    dancook Posts: 26
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    zeupater wrote: »
    All just food for thought ...

    Yummy food.. well how about this..

    I said our idle is around 0.6kwh, which is about 7 pence per hour.
    If I calculated this over 8 hours a day (made up figure) 365 days a year it totals

    £204

    If as you say we could fit a 2kwph system on that portion of the roof, 0.6 out of 2.0 seems like it could at least cover that and save us £204 a year.


    Since all the panels are tight in the same area, could do away with the technology which has the panels work individually? if that's an aspect which brings the price up, that is.

    It also seems like there won't be much to go back to the grid, not sure if it makes sense to set it up still?

    We have underfloor heating in the bathroom and utility too, each probably costs 0.6kwh to use, the bathroom could always do with more heat to reduce damp/mould - so can find a way to use up the excess.
  • dancook
    dancook Posts: 26
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    edited 1 December 2017 at 10:58AM
    Just checked this
    https://www.theecoexperts.co.uk/how-much-electricity-does-average-solar-panel-system-generate

    a 2kW system will produce 1,700 kWh a year

    0.6kWh x 8 hours x 365 = 1752

    So 2kW would pretty much cover our idle, the only problem is Solar panels won't be consistent, sometimes over sometimes under.

    I just realised FiT pays for anything we produce, even if we just use it ourselves
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