• Dirty PV panels

    From N_Cook@diverse@tcp.co.uk to uk.d-i-y on Thu Aug 28 11:37:41 2025
    From Newsgroup: uk.d-i-y

    I travelled on top deck of a bus through a seasode town.
    I was amazed the number of seagull guano splats and general dusty mirk
    on the rooftop panels, perhaps from heatwagves and Canadian wildfires,
    no local wildfires.
    Don't know about these days but in earlier PV days, a splat fully over
    one cell of a PV panel very muched reduced the output of that panel
    and also all those in series with it, same these days?
    How much are people/the nation loosing out by not having germanic style cleaned PV panels?
    --
    Global sea level rise to 2100 from curve-fitted existing altimetry data <http://diverse.4mg.com/slr.htm>
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  • From The Natural Philosopher@tnp@invalid.invalid to uk.d-i-y on Thu Aug 28 12:17:09 2025
    From Newsgroup: uk.d-i-y

    On 28/08/2025 11:37, N_Cook wrote:
    I travelled on top deck of a bus through a seasode town.
    I was amazed the number of seagull guano splats and general dusty mirk
    on the rooftop panels, perhaps from heatwagves and Canadian wildfires,
    no local wildfires.
    Don't know about these days but in earlier PV days, a splat fully over
    one cell of a PV panel very muched reduced the output of that panel
    and also all those in series with it, same these days?
    How much are people/the nation loosing out by not having germanic style cleaned PV panels?

    Does anyone care? As long as the subsidies roll in. Its more cost
    effective to pop a diesel generator in parallel and subsidy farm with
    that rather than clean the panels
    --
    All political activity makes complete sense once the proposition that
    all government is basically a self-legalising protection racket, is
    fully understood.


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  • From charles@charles@candehope.me.uk to uk.d-i-y on Thu Aug 28 12:30:03 2025
    From Newsgroup: uk.d-i-y

    In article <108pbh3$19bl7$1@dont-email.me>,
    N_Cook <diverse@tcp.co.uk> wrote:
    I travelled on top deck of a bus through a seasode town.
    I was amazed the number of seagull guano splats and general dusty mirk
    on the rooftop panels, perhaps from heatwagves and Canadian wildfires,
    no local wildfires.
    Don't know about these days but in earlier PV days, a splat fully over
    one cell of a PV panel very muched reduced the output of that panel
    and also all those in series with it, same these days?
    How much are people/the nation loosing out by not having germanic style cleaned PV panels?

    When, 30+ years ago, the BBC built a naturally powered TV transmitter ,
    they had to add windscreen washer/wipers to the solar panel because of
    seagull mess.
    --
    from KT24 in Surrey, England - sent from my RISC OS 4to#
    "I'd rather die of exhaustion than die of boredom" Thomas Carlyle
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  • From N_Cook@diverse@tcp.co.uk to uk.d-i-y on Thu Aug 28 15:15:03 2025
    From Newsgroup: uk.d-i-y

    On 28/08/2025 12:30, charles wrote:
    In article <108pbh3$19bl7$1@dont-email.me>,
    N_Cook <diverse@tcp.co.uk> wrote:
    I travelled on top deck of a bus through a seasode town.
    I was amazed the number of seagull guano splats and general dusty mirk
    on the rooftop panels, perhaps from heatwagves and Canadian wildfires,
    no local wildfires.
    Don't know about these days but in earlier PV days, a splat fully over
    one cell of a PV panel very muched reduced the output of that panel
    and also all those in series with it, same these days?
    How much are people/the nation loosing out by not having germanic style
    cleaned PV panels?

    When, 30+ years ago, the BBC built a naturally powered TV transmitter ,
    they had to add windscreen washer/wipers to the solar panel because of seagull mess.


    I was assuming inverter design had moved on and could step up very low
    voltage DC of cells/panels in parallel , up to synthesised AC mains
    voltage, or even active switching out/bypassing of underperforming cells individually .
    --
    Global sea level rise to 2100 from curve-fitted existing altimetry data <http://diverse.4mg.com/slr.htm>
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  • From Theo@theom+news@chiark.greenend.org.uk to uk.d-i-y on Thu Aug 28 16:28:47 2025
    From Newsgroup: uk.d-i-y

    N_Cook <diverse@tcp.co.uk> wrote:
    I was assuming inverter design had moved on and could step up very low voltage DC of cells/panels in parallel , up to synthesised AC mains
    voltage, or even active switching out/bypassing of underperforming cells individually .

    Yes, 'solar optimisers' are a DC-DC converter on each panel that matches the maximum power point of the panel to give the maximum achievable current
    through the string by tweaking the output voltage. They're not expensive, although their prices haven't been falling as much as solar panels have.

    Alternatively you can fit a microinverter per (pair of) panel and just hook everything together with mains. That's a bit more expensive but good for shading.

    String (conventional) inverters typically take from one to four strings, so
    if you only have a few panels then you can keep the strings short so shading
    on one panel doesn't drag the others down much.

    And solar panels are so cheap nowadays that a small reduction in output
    doesn't really affect the economics too much.

    Theo
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  • From Paul@nospam@needed.invalid to uk.d-i-y on Thu Aug 28 12:15:47 2025
    From Newsgroup: uk.d-i-y

    On Thu, 8/28/2025 6:37 AM, N_Cook wrote:
    I travelled on top deck of a bus through a seasode town.
    I was amazed the number of seagull guano splats and general dusty mirk on the rooftop panels, perhaps from heatwagves and Canadian wildfires, no local wildfires.
    Don't know about these days but in earlier PV days, a splat fully over one cell of a PV panel very muched reduced the output of that panel
    and also all those in series with it, same these days?
    How much are people/the nation loosing out by not having germanic style cleaned PV panels?


    They discuss the topic here.

    https://www.paradisesolarenergy.com/blog/do-solar-panels-need-to-be-cleaned

    Some panels have a water-only recommendation, which takes all the fun out of it.
    Guano isn't going to move in a big hurry, with only water.

    The panels have to be pitched, for the rain to run off (and wash some of it off).

    You can't hit them with a pressure washer.

    This company uses deionized water while cleaning (and no soap).
    You could eat off those panels.

    https://www.glassmachine.com/wp-content/uploads/2020/05/how-to-clean-solar-panels-3.jpg

    If the funding organization and the group making money off the panels
    are two different groups, there might be little incentive to wash them off.

    With the exception of companies wishing to sell you services, I don't
    know if I've seen pictures taken of the solar panels users doing this
    sort of cleaning (as a regular activity). The ones in snow country, I can believe some of those receive more attention. Even though the panels tend to get
    hot, if you have a snowfall at night, you can build up quite a layer on top.

    https://www.reddit.com/media?url=https%3A%2F%2Fpreview.redd.it%2Fmy-snow-removal-solution-v0-dbn16esiz5lc1.jpeg%3Fwidth%3D1080%26crop%3Dsmart%26auto%3Dwebp%26s%3D5f164d258b355e6c8078d18314a178edde1ac55d

    We have a few solar installations that are used to offset diesel generation
    in Northern Canada, and the install style looks like this. There is a machine that can be
    driven through the solar field, and clean multiple panels as it goes by. But that's
    mainly for snow, and I don't know if they bother cleaning in the summer.

    https://static.wixstatic.com/media/409162_11515faf490d4e3183af849a5cbbe490~mv2.png/v1/crop/x_13,y_0,w_1179,h_369/fill/w_1179,h_366,al_c,q_90,enc_avif,quality_auto/409162_11515faf490d4e3183af849a5cbbe490~mv2.png

    Paul
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  • From alan_m@junk@admac.myzen.co.uk to uk.d-i-y on Fri Aug 29 08:51:02 2025
    From Newsgroup: uk.d-i-y

    On 28/08/2025 17:15, Paul wrote:


    This company uses deionized water while cleaning (and no soap).
    You could eat off those panels.

    Many window cleaners now use de-inonised water these days especially
    when using the brush on a long pole method of cleaning. It means that
    you don't have to squeegee off and drops of water from the glass as
    de-ionised water will not leave any mineral deposits when the water evaporates.

    I clean my own windows and "make" my de-ionised water which I spray on
    with a garden sprayer as a final rinse. No need to use a squeegee or
    cloth to dry off the glass.

    If the funding organization and the group making money off the panels
    are two different groups, there might be little incentive to wash them off.

    With the exception of companies wishing to sell you services, I don't
    know if I've seen pictures taken of the solar panels users doing this
    sort of cleaning (as a regular activity). The ones in snow country, I can believe some of those receive more attention. Even though the panels tend to get
    hot, if you have a snowfall at night, you can build up quite a layer on top.

    I've just spent a period in a UK rural location surrounded by fields
    that haven't had any rain for the past 8/10 weeks my car windscreen was covered in a fine layer of dust (blown soil) every day. I would expect
    the same to have happened in a UK solar farm.

    I've seen videos of panels installed in very arid regions/countries when
    they get covered in a thick layer of dust/sand etc. and they do have to
    be washed down with water on a regular basis.
    --
    mailto : news {at} admac {dot} myzen {dot} co {dot} uk
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  • From Spike@aero.spike@mail.com to uk.d-i-y on Fri Aug 29 08:03:11 2025
    From Newsgroup: uk.d-i-y

    alan_m <junk@admac.myzen.co.uk> wrote:
    On 28/08/2025 17:15, Paul wrote:

    I've seen videos of [solar] panels installed in very arid regions/countries when
    they get covered in a thick layer of dust/sand etc. and they do have to
    be washed down with water on a regular basis.

    So, not very environmentally friendly, then, using water to clean them, in
    arid regionsrCa
    --
    Spike

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  • From alan_m@junk@admac.myzen.co.uk to uk.d-i-y on Fri Aug 29 13:42:02 2025
    From Newsgroup: uk.d-i-y

    On 29/08/2025 09:03, Spike wrote:
    alan_m <junk@admac.myzen.co.uk> wrote:
    On 28/08/2025 17:15, Paul wrote:

    I've seen videos of [solar] panels installed in very arid regions/countries when
    they get covered in a thick layer of dust/sand etc. and they do have to
    be washed down with water on a regular basis.

    So, not very environmentally friendly, then, using water to clean them, in arid regionsrCa


    When has "green" energy had anything to do with being environmentally friendly?
    So many crackpot schemes so long as it's "not in my backyard"
    --
    mailto : news {at} admac {dot} myzen {dot} co {dot} uk
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  • From Theo@theom+news@chiark.greenend.org.uk to uk.d-i-y on Fri Aug 29 15:04:05 2025
    From Newsgroup: uk.d-i-y

    Spike <aero.spike@mail.com> wrote:
    alan_m <junk@admac.myzen.co.uk> wrote:
    On 28/08/2025 17:15, Paul wrote:

    I've seen videos of [solar] panels installed in very arid regions/countries when
    they get covered in a thick layer of dust/sand etc. and they do have to
    be washed down with water on a regular basis.

    So, not very environmentally friendly, then, using water to clean them, in arid regionsrCa

    As opposed to using water to drive the turbines and cool a thermal power station?

    Which power sources don't use water? Wind is the only one I can think of. Solar is going to be using a much smaller quantity of water than anything
    with evaporative cooling, and if you are arid you don't have the convenience
    of a local river or sea to heat exchange into.

    Theo
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  • From Paul@nospam@needed.invalid to uk.d-i-y on Fri Aug 29 13:21:47 2025
    From Newsgroup: uk.d-i-y

    On Fri, 8/29/2025 4:03 AM, Spike wrote:
    alan_m <junk@admac.myzen.co.uk> wrote:
    On 28/08/2025 17:15, Paul wrote:

    I've seen videos of [solar] panels installed in very arid regions/countries when
    they get covered in a thick layer of dust/sand etc. and they do have to
    be washed down with water on a regular basis.

    So, not very environmentally friendly, then, using water to clean them, in arid regionsrCa


    It's a popular research topic, and at least one cleaning company
    claims to already recycle the water it uses.

    https://link.springer.com/article/10.1007/s42452-022-05205-7

    One of the cleaning methods doesn't even use water, or a liquid.

    Another experimenter worked with organic solvents, to see
    if they were more effective (which is not going to be cheap).
    Worth checking I suppose.

    I'm surprised the surface of the panel, puts up with this abuse.

    Paul
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  • From The Natural Philosopher@tnp@invalid.invalid to uk.d-i-y on Fri Aug 29 19:39:52 2025
    From Newsgroup: uk.d-i-y

    On 29/08/2025 13:42, alan_m wrote:
    On 29/08/2025 09:03, Spike wrote:
    alan_m <junk@admac.myzen.co.uk> wrote:
    On 28/08/2025 17:15, Paul wrote:

    I've seen videos of [solar] panels installed in very arid
    regions/countries when
    they get covered in a thick layer of dust/sand etc. and they do have to
    be washed down with water on a regular basis.

    So, not very environmentally friendly, then, using water to clean
    them, in
    arid regionsrCa


    When has "green" energy had anything to do with being environmentally friendly?
    So many crackpot schemes so long as it's "not in my backyard"

    +1
    --
    "Corbyn talks about equality, justice, opportunity, health care, peace, community, compassion, investment, security, housing...."
    "What kind of person is not interested in those things?"

    "Jeremy Corbyn?"


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  • From Mark Carver@mark@invalid.com to uk.d-i-y on Sat Aug 30 12:19:25 2025
    From Newsgroup: uk.d-i-y

    On 28/08/2025 11:37, N_Cook wrote:
    I travelled on top deck of a bus through a seasode town.
    I was amazed the number of seagull guano splats and general dusty mirk
    on the rooftop panels, perhaps from heatwagves and Canadian wildfires,
    no local wildfires.
    Don't know about these days but in earlier PV days, a splat fully over
    one cell of a PV panel very muched reduced the output of that panel
    and also all those in series with it, same these days?
    How much are people/the nation loosing out by not having germanic style cleaned PV panels?


    I noticed a pigeon splat on one of my panels recently, I thought, ummm, because you have to carefully remove them from car body work. I
    carefully fired my garden hose at it, (live in a bungalow) and to my
    surprise it just fell off !

    I get our window cleaner to clean them spring and autumn using
    de-ionised water. There was a lot of dust on them this week (though I
    couldn't see any measurable reduction in output). Anyway, yesterday's
    deluge of rain has restored them to sparkling.
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  • From N_Cook@diverse@tcp.co.uk to uk.d-i-y on Sat Aug 30 15:14:51 2025
    From Newsgroup: uk.d-i-y

    On 30/08/2025 12:19, Mark Carver wrote:
    On 28/08/2025 11:37, N_Cook wrote:
    I travelled on top deck of a bus through a seasode town.
    I was amazed the number of seagull guano splats and general dusty mirk
    on the rooftop panels, perhaps from heatwagves and Canadian wildfires,
    no local wildfires.
    Don't know about these days but in earlier PV days, a splat fully over
    one cell of a PV panel very muched reduced the output of that panel
    and also all those in series with it, same these days?
    How much are people/the nation loosing out by not having germanic
    style cleaned PV panels?


    I noticed a pigeon splat on one of my panels recently, I thought, ummm, because you have to carefully remove them from car body work. I
    carefully fired my garden hose at it, (live in a bungalow) and to my
    surprise it just fell off !

    I get our window cleaner to clean them spring and autumn using
    de-ionised water. There was a lot of dust on them this week (though I couldn't see any measurable reduction in output). Anyway, yesterday's
    deluge of rain has restored them to sparkling.

    Perhaps it has that "nano" coating that stops stuff sticking, when the
    glass is vertical , perhaps not at roof pitch but looser stick than
    without the coating.
    --
    Global sea level rise to 2100 from curve-fitted existing altimetry data <http://diverse.4mg.com/slr.htm>
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  • From Marland@gemehabal@btinternet.co.uk to uk.d-i-y on Sun Aug 31 08:27:06 2025
    From Newsgroup: uk.d-i-y

    alan_m <junk@admac.myzen.co.uk> wrote:
    On 28/08/2025 17:15, Paul wrote:



    I've just spent a period in a UK rural location surrounded by fields
    that haven't had any rain for the past 8/10 weeks my car windscreen was covered in a fine layer of dust (blown soil) every day. I would expect
    the same to have happened in a UK solar farm.


    Here on the Hants-Dorset border there have been a lot of Heath fires not
    too far away and presumably as you can smell the smoke there is some
    depositing with the dust, other parts of the UK have had similar fires but
    even if they havenrCOt some reports say that the spectacular sunsets we have been having are due to particles from fires as far away as Canada though I donrCOt know where they eventually fall to the ground.
    As you said the recent rain has given things a rinse.

    I started a thread awhile back about the rise in small business offering
    roof cleaning thinking it seemed a bit of a contrived industry but
    apparently moss grows more now there are normally less pollutants in the atmosphere, presumably this new industry can easily include solar panels
    when they clean a roof. You just have to hope that the operator knows how
    to do it properly and isnrCOt just some thick oaf whose vape shop has gone
    bust and has bought a powerful pressure washer and a cheap tower and justs blasts away as their next business venture.

    GH
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  • From Paul@nospam@needed.invalid to uk.d-i-y on Sun Aug 31 05:23:14 2025
    From Newsgroup: uk.d-i-y

    On Sun, 8/31/2025 4:27 AM, Marland wrote:
    alan_m <junk@admac.myzen.co.uk> wrote:
    On 28/08/2025 17:15, Paul wrote:



    I've just spent a period in a UK rural location surrounded by fields
    that haven't had any rain for the past 8/10 weeks my car windscreen was
    covered in a fine layer of dust (blown soil) every day. I would expect
    the same to have happened in a UK solar farm.
    ...
    some reports say that the spectacular sunsets we have
    been having are due to particles from fires as far away as Canada though I donrCOt know where they eventually fall to the ground.
    As you said the recent rain has given things a rinse.

    We're working as hard as we can, to fill the air with smoke.

    The shocking part for me, was there was a fire back home, it started
    near a shopping area (woods come up to that shopping area), and
    after many days, it was still "out of control". They had some smaller
    equipment for water drops, but not any of the larger planes. And
    when stuff like this happens, there is a danger of houses getting
    burned up.

    We've had entire towns leveled by these fires, and the sites afterwards
    can be a bit toxic, and it's hard to start construction and rebuild them.

    Not a good summer, in terms of the number of settlements that had to be evacuated. Some were evacuated via military flights.

    Occasionally, one of these fires, it will be reported about the
    "fire making its own weather", and the treetops burn with a particular ferocious nature. This is partially due to drought and dried out crowns,
    and then the stuff burns like it was petrol or something. How do you
    stop those ? Even a water bomber with chemicals will have trouble.

    There are several sizes of water bombers. We don't have the largest ones.
    We have some intermediate ones. And, we have a lot more "helicopters with buckets on the bottom". The waiting list, to have new intermediate water bombers
    built, might be getting close to a ten year wait. So if you have the money, there might not be any supply of a useful (float type) water bomber.
    I think the largest water bombers are filled at the airport. My brother in
    law used to work at the airport near where he lives, and was part of the
    team loading up chemicals into water bombers. (Hint: You don't wear your
    good clothes to work, even if you're a supervisor.)

    The yellow one here (CL 415), is the style we use, when we have them to hand. The larger ones dropping retardant, I don't think we have any of
    those models. The float plane style is considered more practical here,
    because you can fill them via a mid-sized lake and at least drop water on a fire.
    The two Mars (5000 gallons?) those are retired.

    https://www.bbc.com/future/article/20150821-the-jaw-dropping-missions-of-fire-fighting-pilots

    One of the Quebec pilots was reporting what it was like to bomb in L.A.
    and as you're flying up a canyon, the plane is shaking (from the fire updraft), the controls are shaking, not a pleasant way to fly... It's bad enough
    kinda terrain-hugging, but the aerodynamics of the situation make
    it doubly dangerous.

    We don't fight all the fires. If there are 200 of them, some will just
    burn merrily along, hundreds of thousands of acres. Lightning starts
    the fires. A lack of rain means they can run a long time. Fires near habitations, those are the ones they try to control. There have been a
    couple of articles about "finding creative ways to staff fire fighting
    on the ground". You cannot just stick any old human in the woods.
    One person without much experience under their belt, had a tree fall on
    them, killed just like that. This is why you have to apprentice with
    people who can judge the risks best. You can't turn your back on a tall
    tree, in forest fire country.

    We used to have small teams of experts, who would parachute into a young
    fire, but we've stopped doing that (for a number of reasons I would
    presume). You can sometimes stop a fire before it gets too big. According to this, there are still two stations doing this. You need helicopters for support, so if the crew is surrounded, they can be lifted out. The helicopters that drop water on fires, are no good for rescuing crews.

    https://en.wikipedia.org/wiki/Smokejumper

    Steerable parachutes, are used for precision landings. There's no room
    for your bologna sandwich for lunch.

    https://cdnassets.stihlusa.com/1747339849-smokejumper_jumbotron_wide.jpg?fit=crop&h=800&w=1920

    Paul

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  • From RJH@patchmoney@gmx.com to uk.d-i-y on Sun Aug 31 09:39:44 2025
    From Newsgroup: uk.d-i-y

    On 28 Aug 2025 at 11:37:41 BST, N_Cook wrote:

    I travelled on top deck of a bus through a seasode town.
    I was amazed the number of seagull guano splats and general dusty mirk
    on the rooftop panels, perhaps from heatwagves and Canadian wildfires,
    no local wildfires.
    Don't know about these days but in earlier PV days, a splat fully over
    one cell of a PV panel very muched reduced the output of that panel
    and also all those in series with it, same these days?
    How much are people/the nation loosing out by not having germanic style cleaned PV panels?

    Mine had a crust of brown dirt - maybe from building work nearby. Yesterday's first proper rain in 3 months has left them looking pristine.

    Can't say the muck cut the output noticeably.
    --
    Cheers, Rob, Sheffield UK
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