It depends on a lot of factors. It’s less, but definitely not negligible. Especially if you have a fence running north/south with bifacial panels, you will generate most of your power in the morning and the evening when demand is highest. If you have some kind of net metering, the extra power in the evening could outpace panels in a normal configuration from a monetary perspective.
Many typical configurations also suffer from decreased efficiency due to heat, which is the worst around noon on a clear day. Vertical panels get the least direct light around then.
It’s also better for dirt and snow like others have mentioned.
I’ll hunt for an article with some actual numbers.
Successful_Try543@feddit.org 1 day ago
No, it’s not negligible. Over the year, it’s about 25 % to 50 % less than if optimal tilted and directed.
www.youtube.com/watch?v=L-GqZ2Z90aM
solo@slrpnk.net 1 day ago
Just to note something that was not mentionned in the video: if we talk about an area that gets snow, vertical ones can be the best choice because they do not hold any snow during winter.
eleitl@lemmy.zip 1 day ago
Vertically mounted bifacials have better cooling so higher efficiency, harvest light from both sides and provide more during low winter sun and no snow cover on the panels/reflected light from the snow.