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Renewables: "talking 'bout my generation"

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  • legoman62
    legoman62 Posts: 4,991 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    4.65 O's today:D

    Somehow managed to use over 50% of it.....even though we were out most of the day:T
    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
    tunnel wrote: »
    May have to hit the t0309.gif to console myself t2712.gif

    That's not Heineken is it .........:eek:

    Just about managed a/an Hawaii + 0.68 O's today; need to average 5.96 O's over the next four days to beat July '13....coffee.gif Think it is doable, spoke to me panels this evening, told em the score, they are up for it; we shall see....:rotfl::rotfl: relaxing-outside-smiley-emoticon.gifcoffee.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).
  • Dave_Fowler
    Dave_Fowler Posts: 626 Forumite
    Part of the Furniture 500 Posts Name Dropper
    Martyn1981 wrote: »
    Hiya Shavy, you'll need to look at the specific datasheet for a particular panel make/model, but generally their power output is stated at about 25C. Give or take, most panels seem to lose about 0.4% performance per 1C rise, or 1% for 2.5C rise (IYSWIM).

    So 25C rise should knock about 10% off performance.

    Remember this is the panel temp, not the air temp, so think hot metal car in the sun, not air temp.

    I've been seeing my ESE system running at about 70 to 75% this last week (approx 2.6kW from 3.58kWp), whilst sitting in constant sun, clear sky, but no wind to cool the panels, and flush out the hot air build up. But, regardless, lots of nice generation, and looking like a very good July, possibly 120%. Fingers crossed.

    Mart.
    Yesterday the highest air temperature here was 27.5C. The panel temperature at the same time was 49.5C. And that's the temperature on the edge of the panel - I'm not going to stick the sensor on a productive part of the panel!

    So with a panel temperature of 50C or more, I was losing a good 10% of possible output due to the temperature rise above 25C. Remember, at temperatures lower than 25C, there will be an increase in output. Need a good stiff northerly breeze and 16 hours of sun at the same time. If only.

    Dave F
    Solar PV System 1: 2.96kWp South+8 degrees. Roof 38 degrees. 'Normal' system
    Solar PV System 2: 3.00kWp South-4 degrees. Roof 28 degrees. SolarEdge system
    EV car, PodPoint charger
    Lux LXP 3600 ACS + 6 x 2.4kWh Aoboet LFP 2400 battery storage. Installed Feb 2021
    Location: Bedfordshire
  • shavy65
    shavy65 Posts: 562 Forumite
    Tenth Anniversary 500 Posts
    Dave_Fowler wrote: »
    Yesterday the highest air temperature here was 27.5C. The panel temperature at the same time was 49.5C. And that's the temperature on the edge of the panel - I'm not going to stick the sensor on a productive part of the panel!

    So with a panel temperature of 50C or more, I was losing a good 10% of possible output due to the temperature rise above 25C. Remember, at temperatures lower than 25C, there will be an increase in output. Need a good stiff northerly breeze and 16 hours of sun at the same time. If only.

    Dave F


    Garden hose?
    3.975 kWp System, South facing, 21 degree pitch, 15 x Canadian Solar Elps, Samil Inverter, location NE Scotland (Fraserburgh) Bring on the Sun :beer:
  • KevinG
    KevinG Posts: 2,088 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    shavy65 wrote: »
    Garden hose?
    Offset cost of water! (You are all on meters, I trust :))
    2kWp Solar PV - 10*200W Kioto, SMA Sunny Boy 2000HF, SSE facing, some shading in winter, 37° pitch, installed Jun-2011, inverter replaced Sep-2017 AND Feb-2022.
  • KevinG
    KevinG Posts: 2,088 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    shavy65 wrote: »
    Back in May I broke the elusive 30 kWh barrier and presumed I`d do even better over the last couple of months but the last couple of blue sky days have seen me hit 24/25ish.
    My best days have always been in April and May, I now know I am never likely to beat these in summer, barring freaky cold sunshine.
    2kWp Solar PV - 10*200W Kioto, SMA Sunny Boy 2000HF, SSE facing, some shading in winter, 37° pitch, installed Jun-2011, inverter replaced Sep-2017 AND Feb-2022.
  • groovyf
    groovyf Posts: 286 Forumite
    Sixth Anniversary Combo Breaker
    It was around 8 degrees cooler yesterday than Saturday and the system peaked at 3.56kW as opposed to 2.8kW - can't be bothered to work out that efficiency % against temp :D
    4kWp system (Feb 2014) : 1.5 SW, 2.5 NE (16x Bisol BMO/250, Aurora Power-One UNO PVI-3.6 Inverter : pvoutput.org/list.jsp?id=29935
  • shavy65
    shavy65 Posts: 562 Forumite
    Tenth Anniversary 500 Posts
    KevinG wrote: »
    Offset cost of water! (You are all on meters, I trust :))

    No meters here in Scotland! :D

    Just got myself a couple of hozelock fittings, a 15m garden hose and a Hozelock Sink Adapter. My baby enjoyed his first venture into the paddling pool yday, thought I could make the most of my free hot water by running a hose from the utility room sink out into the paddling pool! Just not sure how long hot water should last on a sunny day, 210L tank, average flow maybe about 15L/min possibly? I don`t know :)

    Not very `green` I know, but in my little head I make up for it with the electric units I don`t use from the grid :o
    3.975 kWp System, South facing, 21 degree pitch, 15 x Canadian Solar Elps, Samil Inverter, location NE Scotland (Fraserburgh) Bring on the Sun :beer:
  • KevinG
    KevinG Posts: 2,088 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    shavy65 wrote: »
    No meters here in Scotland! :D
    Really? I never knew that. My bills halved when I got a meter fitted 14 years ago; that was voluntary, it's pretty much compulsory now.
    2kWp Solar PV - 10*200W Kioto, SMA Sunny Boy 2000HF, SSE facing, some shading in winter, 37° pitch, installed Jun-2011, inverter replaced Sep-2017 AND Feb-2022.
  • tunnel
    tunnel Posts: 2,601 Forumite
    Part of the Furniture 1,000 Posts Combo Breaker
    KevinG wrote: »
    Really? I never knew that. My bills halved when I got a meter fitted 14 years ago; that was voluntary, it's pretty much compulsory now.

    Since when?

    As far as i was aware you can ask to be swapped to metered and then have 12 months in which to change your mind, other than that it's not compulsory.
    2 kWp SEbE , 2kWp SSW & 2.5kWp NWbW.....in sunny North Derbyshire17.7kWh Givenergy battery added(for the power hungry kids)
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