First off, Welcome!
You may want to look at this site and recalculate your findings. December is the worst month to work from. If you design from there, things will work..
Sunrise, sunset, dawn and dusk times around the World - Gaisma
"Average" is year round. Reality is 1.32 hrs./Day during mid winter in Ohio. It's the only time of the year that I need to run my back up generator..