crazy4ChickensNducks
Crowing
You do not need a heat lamp. I did not even use a lamp when it got to -25 degrees below 0. A heat lamp will kill your chickens faster than the cold
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I'm in Cleve OH and we get -15 for a week every winter. I do not need a heat source in my coop. So you probably don't need one for yours. YMMV. I know someone up here who used a heat lamp and it kept her chickens so warm they burnt up in a coop fire that nearly spread to her house. :T So it's best to not use heat lamps if you can avoid them.
Back to solar panels and fans, depends on how big the fan is. A $90, 40"x27" solar panel like this says it produces 0.5kwh/day under ideal conditions. The internet tells me that a box fan on average is gonna use 0.07kw/hr so over the course of a day, running 24 hours, will eat up about 1.7kwh. So it would take a patch of $400 of solar panels, spread over a 2'x14' area, to likely power the average box fan 24/7.
Compare this to a tiny computer fan like this, this tiny fan is only 4" and uses 8w/hr so 0.008kw/hr, so it only uses about 0.2kwh/day. You could run two of these off of just one of the solar panels above forever until the parts burn out.
Incidentally, if you wanna know how much it would take to heat a coop, a 250 watt space heater or a 250 watt light bulb run 12 hours a day would run 3kwh/day, or would require a solar array of 12 panels costing $600 and covering an area of 100sqft. And that's during the summer, when sun conditions are ideal. In the winter when less light hits your panels you would probably need twice that.
Also incidentally, looking up LED lights online, the wattage of a 60-watt-lumen-equivalent LED is 9 watts, so you could run two big LED light bulbs off of one solar panel as well, 24/hours a day. They would produce no heat. Which means for extra winter lighting in your coop, a tiny solar panel could run a bright light in your coop for a few hours a day no problem, even though heating and cooling are expensive.
Heating and cooling are the most energy intensive things we do in the western world.