My homemade one is still going strong over a year later.
https://www.backyardchickens.com/articles/diy-automatic-chicken-coop-door-with-timer-solar-charger.73103/
Mine's been going strong all winter. Even when temps were down to -15f (without wind chill).
Here's an article on how to build:
https://www.backyardchickens.com/articles/diy-automatic-chicken-coop-door-with-timer-solar-charger.73103/
My DIY door is going strong. Works in temps down to -15 F.
https://www.backyardchickens.com/articles/diy-automatic-chicken-coop-door-with-timer-solar-charger.73103/
Here's what the lights mean:
"Charge" LED (Green) : When lit, it means your battery is charging. When out (like at night when no light shining on solar panel it will be unlit. When the battery is peak charged, the "Charge" LED will flicker meaning it is in a state of float charging.
"Load"...
I don't believeyou can "short" an electric fence. The current is flowing into the fence already. The circuit is completed when someone or something touched the fence and ground.
I was surprised to find that the solar panel was keeping my batt charged on overcast days. My coop is also NOT in an optimal spot and only gets full sun for about 2 hours and the rest of the day it's in the shadow of my garage.