Solar panels at 90 degree angles

[Northernchateau]

This is a perfect example why I say in some locations it's better to have panels under an soffit and at 90 degs.
Yesterday it snowed lightly on and off all day. Below you can see what the panels look like in different locatons.
Now I will clean them this morning ,if you have a place you might be only using on the weekend you can see clearly the vertical panel on the bottom left would need no maintenance.
I will take some pics when we get more real snow and I also plan on testing the output on the lower left array at different angles with snow cover ground.

 

[Zwy]

This calculator is very accuracity: https://re.jrc.ec.europa.eu/pvg_tools/en/

That is the one I use, PV Watts doesn't come close.