4 ms·

At the same time, the generated electricity also seems insane to me. We live in a complex with 84 units, each with a solar roof, outputting about 12 kWh per un

• szvsw 2y ago
  Where do you live? What latitude? That can have a big impact. Also note that the publication was 2021, not 2011 (typo by parent)
  • haizhung 2y ago
    About 52.5 deg north. How much difference can that make?
    • szvsw 2y ago
      It can definitely make a big difference. DC’s latitude is 38 degrees. That’s about the same gap to Miami (25 degrees). Think about shining a flashlight perpendicular to the ground vs at an angle. Beyond the dynamics of direct irradiance, there’s also weather to consider- if you live in a significantly cloudier area (which might be possible, assuming you live in Canada or Germany/netherlands/etc based off that latitude), that will obviously affect output. And then there is also things like building-to-building shading, in case you live in a dense area… lots of things can affect this kind of calculation. Try playing around with the National Renewable Energy Laboratory’s PVWatts calculator: https://pvwatts.nrel.gov/pvwatts.php https://pvwatts.nrel.gov/pvwatts.php