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Renewables: "talking 'bout my generation"

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Comments

  • jimmyboy420
    jimmyboy420 Posts: 1,004 Forumite
    Part of the Furniture Combo Breaker
    zeupater wrote: »
    You have an average for the month already from PVGIS ... this is fixed and will be the value to be apportioned over the available days .... the issue is the apportionment

    You've interpolated what the generation would be at change of each month from the averages .... so you have a fixed value to apportion (the minimum daily) and the variable (max-min) to increment by day ....

    The problem with that is, you still get ugly steps at the month end dates. I agree that the suggested method will give linear figures within a month, but I had originally thought you meant to interpolate linearly between, say, 31/12 calculated figure and 31/01 calculated figure for the whole of January. That would avoid any step change at the month end dates.

    Once again - I do realise it's all very hypothetical (thanks for the input Eric), but I would like to be as hypothetically close to what it would be in an ideal world as I can!
    3.924kWp (12X327Wp SunPower). SolarEdge SE3500 inverter.
    Surrey/SE. 30 degree roof pitch, chimney shading from mid afternoon.
  • jimmyboy420
    jimmyboy420 Posts: 1,004 Forumite
    Part of the Furniture Combo Breaker
    lstar337 wrote: »
    Out of curiosity, does anybody here know how to get hold of recorded daily temperatures for a given area?
    Thanks.
    I use Weather Underground :)
    3.924kWp (12X327Wp SunPower). SolarEdge SE3500 inverter.
    Surrey/SE. 30 degree roof pitch, chimney shading from mid afternoon.
  • zeupater
    zeupater Posts: 5,390 Forumite
    Part of the Furniture 1,000 Posts Name Dropper Combo Breaker
    EricMears wrote: »
    ... But where we might disagree is on how worthwhile it is ! Afraid I take the view that weather is so unpredictable that any particular day stands a good chance of being really bright & sunny or completely overcast and that sort of error would change a day's output by rather more than moving the date a month forward or back. I wouldn't therefore make any attempt to forecast what my September output is likely to be on the basis of what it was for half a month plus what it might be for the other half ! I'll wait until dusk on 30th before doing any maths. ...
    Hi

    I agree ... if we lived in the middle of the Atacama desert then my opinion might be different, but as it is, averages are just that - averages.

    All you're effectively doing by over-analysing the data is attempting to predict what the new average needs to be in order to achieve a historical average, which may, or may not have any direct relation to your own system's past performance ... in other words, setting the foundations for a totally obsessive lifestyle ... but what for? ... it's cloudy here now & however much I worry, it'll have no effect on whether it'll still be cloudy in 20minutes time, let alone next week ...

    ... but then again, you could download the daily sunrise/sunset times for a particular location from somewhere like (http://uk.weather.com/) and then apportion monthly PVGIS by the actual hours:minutes:seconds of light available by day ... but that would be really obsessive ... I know, because I thought about doing it once (honest, I didn't actually do it .. ;)), before realising that there was only 20seconds difference in the length over the whole of June, just as a fluffy cloud came over for about five minutes .... had a coffee instead ...

    HTH
    Z
    "We are what we repeatedly do, excellence then is not an act, but a habit. " ...... Aristotle
    B)
  • lstar337
    lstar337 Posts: 3,443 Forumite
    Part of the Furniture 1,000 Posts Name Dropper Combo Breaker
    jimmyboy420 wrote: »
    I use Weather Underground :)
    Thanks a bunch!

    Great site.
  • tunnel
    tunnel Posts: 2,601 Forumite
    Part of the Furniture 1,000 Posts Combo Breaker
    Alright....own up....who's pinchin all the sunshine???:(

    Just over 2 O's today b0406.gif
    2 kWp SEbE , 2kWp SSW & 2.5kWp NWbW.....in sunny North Derbyshire17.7kWh Givenergy battery added(for the power hungry kids)
  • legoman62
    legoman62 Posts: 5,000 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    tunnel wrote: »
    Alright....own up....who's pinchin all the sunshine???:(

    Just over 2 O's today b0406.gif

    Not me...none here either. 1.47 O's today:think::)
    16 Sanyo Hit 250s.4kWp SMA 3.8kWp inverter. SW roof. 28° pitch. Minimal shade. Nov 2011 install. Hybrid car. Ripple Kirk Hill. N.E Lincs Coast.
  • Oscargrouch
    Oscargrouch Posts: 4,393 Forumite
    Part of the Furniture 1,000 Posts Name Dropper Photogenic
    EricMears wrote: »
    OTOH, on the downhill side of the Summer Solstice every day is just a bit shorter than previous one so you need to be at more than 50% of PVGIS at middle of month if you want to be at 100% by end.

    Bet that took some calculations....:rotfl:
    legoman62 wrote: »
    Not me...none here either. 1.47 O's today:think::)
    It could be me...................................c05100.gif
    3.28 O's today....coffee.gif
    2.5 kWp PV system, SSW facing, 45 Deg Roof. ABB Inverter, Monitor: 'Wattson'.
    Reg. for FIT Nov 2011. "It's not what you generate; it's how you use it that matters". One very clean Vauxhall Diesel Sri, £30.00 Road Tax: B)

    Definition of 'O's = kWh/kWp (kWh = your daily & accurate Generation figure) (kWp = the rated output of your PV Panels).
  • countryman_2
    countryman_2 Posts: 421 Forumite
    Yesterday ..... 2.67 O's

    Looking at forecast for today ..... grim outputs are expected.
    4kw PV fitted 4th July 2014 (Green Energy NW £5600). WSW facing, 30 deg Pitch, Unshaded, Samil Solar River inverter, 16 Solar World Mono panels, Iboost on Immersion Heater. located in mid Lincolnshire.
  • jimmyboy420
    jimmyboy420 Posts: 1,004 Forumite
    Part of the Furniture Combo Breaker
    3.36 for me yesterday...
    3.924kWp (12X327Wp SunPower). SolarEdge SE3500 inverter.
    Surrey/SE. 30 degree roof pitch, chimney shading from mid afternoon.
  • EricMears
    EricMears Posts: 3,310 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    tunnel wrote: »
    Alright....own up....who's pinchin all the sunshine???:(

    Sorry, it was me - I'm having a few days in Hampshire so brought my sunshine with me. Didn't realise anyone else in Derbyshire would need it :D
    NE Derbyshire.4kWp S Facing 17.5deg slope (dormer roof).24kWh of Pylontech batteries with Lux controller BEV : Hyundai Ioniq5
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