A 5-year study performed at the Northern Alberta Institute of Technology involved a practical demonstration and measurement of power produced by solar panels oriented at various angles in winter conditions.
The intent was to determine how much power is lost due to snowfall and what role the deployment angle of solar panels had on solar power generation.
Multiple solar panels were setup at multiple deployment angles, with one half of the tested panels left to be naturally covered by any snowfall and the other side cleaned of snow daily during winter months.
Here is a link to the NAIT solar panel study
Unlike the NAIT study, this experiment will involve the deployment of just three 100W Renogy Monocrystalline solar panels.
90° facing directly south: Likely the most optimal deployment during the winter
69° facing south: Likely the most optimal in the summer
90° facing north: During the early spring and late summer, the sun is low on the horizon at night and high during the day. So a north facing solar panel would capture power overnight.
For any equipment that is deployed in the field off-grid, making the absolute most use out of the available 24 hours of daylight is necessary.