- Aug 29, 2022
With 5 degree tilt your loss will be greater in winter than in summer. You can put your lat/long into PVWatts and play around with different tilt angles. For Halifax and 135 SE / 5 degree tilt and the default 14% system loss it shows me (per kW of panels):The number of kWh available changes by season so in Jan I should get 86% of 66kWh/kW * 25kW = 1419kWh.
That 40/32/40 in Nov/Dec/Jan is your issue. 50 degree panel tilt gives a bit less annual power but 50% more in December:
You'll need to a better tool to study daily variation. There's a big difference between every December day hitting the 1.6 hour average vs. getting all 49 hours in a couple of 3 day sunny stretches separated by weeks of darkness.