Another issue with solar charging in colder climates is snow accumulation on the panel. Combined with less overall incident sunlight due to shorter days and cl

Another issue with solar charging in colder climates is snow accumulation on the panel. Combined with less overall incident sunlight due to shorter days and cloud cover, charging issues with lithium batteries at temps below 0C, and the fact that most common air quality sensors of interest (PM) are comparatively power hungry, it makes fielding a "Lives Forever" device here in Michigan something of a challenge. The traditional approach here is large panels with large lead-acid batteries but the size of the devices involved bring with them further challenges with siting and maintenance.