• 2 Posts
  • 194 Comments
Joined 1 year ago
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Cake day: July 2nd, 2023

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  • The premium you’re placing on avoiding covering 1m^2 with a solar panel that produces a time-averaged 40W at $20/W is about $800

    An overhead agrivoltaic system costs about $800k/ha at ~30% coverage (about double the price per watt of single axis or 3x fixed tilt) or $80/m^2 and increases yields by 10-300% if used on crops that benefit or in situations where water is scarce ir heatwaves are likely (hmm, wonder if that will be relevant). Cover 10m and you’ve saved 1m^2 ti 6m^2 of farmland for $800

    So if it’s worth spending public money to avoid the former, then it’s worth doing the latter even without the electricity.

    It also produces >2x as much electricity.

    So which is it. Are you too stupid to comprehend basic arithmetic, or do you not actually care about land use, cost and enguneering challenges?



  • The electricity generation industry measures everything in power because the main constraint is powerto meet peak load. A 1GW gas peaker that is only going to be used for 400 hours a year is 1GW. So is a 1GW coal plant that runs at 40% power 6000 hours a year. So is a 1GW solar farm that outputs peak power 1000 hours a year and 20-80% for 3000 hours.

    Performatively misunderstanding this concept is just as bad, if not worse, than not including the duration figure and is usually done to try and pretend the 1GW gas peaker running at 4% capacity factor for two hours a day during summer at peak load somehow cannot be replaced by a 500MW solar farm producing at 17% and a 500MW 2hr battery with energy to spare.

    If you see 2.8GW storage, and you trust it’s not just a sham project. Then you know that somewhere in the range of 2.8GW to 10GW of nameplate renewable capacity can be added to the grid. 20GWh doesn’t convey any information.

    Ideally you’d mention both (and include efficiency, seasonality, input power etc.), but this particular pearl clutch is less correct than the headline and is rooted in coal and gas industry propaganda. If only one number is mentioned, then capacity is the most informative.












  • Wild concept: It’s possible to offer a fair price to someone who can. You don’t need to pay $20k for one day’s labour (although you probably do need to pay about $1k for an hour for a licensed electrician to inspect and do the final hookup if you want to AC feed for winter and cloudy days). You do not need to pay $1/W or wait years for grid tie if you have a battery and size for self consumption.

    Given how thoroughly ripped off you are and how dismissive you are of the price people in civilised countries consider normal, I’ll assume you’re in the US. Signature solar sell panels for 31c/W hybrid off-grid inverters for $2k and batteries for $280/kWh. You can probably do better if you look around and don’t just listen to the door to door MLM scammers.