We're pretty used to the cold snaps, but BC doesn't normally see them. Seven years ago or something I was in BC for the month - record rain fall, then snow fall, the plane was delayed twice because there were no plow trucks or any way to clear the runway :) A couple weeks ago i noticed the panels out of the winter slump and headed back to summer time giving. Are your panels shaded at all when the sun slumps in the winter ? I had to trim some taller trees when the sun first started getting lower before winter.