Comment on ‘If 1.5m Germans have them there must be something in it’: how balcony solar is taking off

btaf45@lemmy.world ⁨1⁩ ⁨week⁩ ago

• Draedron@lemmy.dbzer0.com ⁨1⁩ ⁨week⁩ ago

  Less efficient than not having them?

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  • cjk@discuss.tchncs.de ⁨1⁩ ⁨week⁩ ago

    Wrong question. The right question is: is the solar panel able to be CO2 neutral (at least) or CO2 negative. We don’t get anything out of it if producing the solar panel costs more CO2 emissions than it saves by producing electricity.

    Before you ask: I don’t know the answer. I was looking into this thread in hope to find it.

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    • GaMEChld@lemmy.world ⁨1⁩ ⁨week⁩ ago

      Most people don’t care about being CO2 neutral. The real question is what is the ROI? Will the panel save that person money. If it takes 50 years to pay for itself, I’d say that’s bad. 10 years is more standard. 5 years I say it’s a no brainer. Though I suppose you can also argue value for utility, if that is giving her the ability to power something off grid that would be worth something.

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      • Krik@lemmy.dbzer0.com ⁨1⁩ ⁨week⁩ ago

        In Germany those panels usually pay themselves after about 5 years depending on the price of the necessary electronics (don’t forget the electricity meter!) and if there’s also a battery.

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    • dreugeworst@lemmy.ml ⁨1⁩ ⁨week⁩ ago

      To be a positive impact, they just need to be less carbon intensive thans the energy they displace. According to the first results on google, (presumably utility-scale) solar is about 12 times less carbon intensive than natural gas and 20 times compared to coal. So as long as you’re replacing base load and not utility solar, balcony solar could be as much as 10 times less efficient and still come out a net positive.

      Keep in mind also that these numbers keep improving as solar panel manufacturing becomes more efficient and starts using more green energy itself over the coming decades

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  • btaf45@lemmy.world ⁨1⁩ ⁨week⁩ ago

    I hung a solar panel vertically on my fence one time. It was facing west rather than south, but I was only getting about 3-4 watts on my 100 watt panel under the best conditions.

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  • colourlessidea@sopuli.xyz ⁨1⁩ ⁨week⁩ ago

    Depends, is an imaginary angle comparable to a 45 degree angle?

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• DegenerationIP@lemmy.world ⁨1⁩ ⁨week⁩ ago

  The most have a 45 degree angle

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• leds@feddit.dk ⁨1⁩ ⁨week⁩ ago

  Might be most efficient when power is in higedt demands, in the morning and evenings when everyone is using power at home.

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