December 21 was the shortest day of the year and, though useful, not the optimal day for solar energy production. As the earth spins, the axis that runs between the poles was furthest at the northern extreme on that day. This makes December 21 the longest day of the year in the Southern hemisphere. But we live in the Northern hemisphere and our shorter days of winter are accompanied by cold temperatures, snow and ice.
The good news is that, from December 21 until June 21, the days are growing longer. Longer days occur as the earth’s axis comes around so the North pole is closer to the sun. As this happens, the weather around here will grow warmer. Summer will arrive and we will have survived another Northern Illinois winter as solar panels are prepared for higher production.
Longer days offer extra helpings of sunlight to feed solar panels
Solar panels collect the UV rays of the sun all year long. But, obviously, shorter days make for fewer UV rays. In translation, the approaching spring and summer promise more of the sun’s energy for solar panels to convert into electricity. That makes this an optimal time of year to have a solar array added to a home or office so that you’ll be ready as the longer days come along.
Through the warmer months of the year, solar panels are likely to absorb more UV rays than you need. That’s not a problem since the utility companies are required to use a tool called ‘Net-Metering’ as an electric savings account for customers who have solar energy systems.
The warmer months, therefore, aren’t just good for an abundance of UV rays providing energy production for use now. The warmer months, with longer days, are also good for building up electricity generation credits for the winter months when the days are shorter.