Ask and... here is a video talking about manual versus dawn/dark photo sensor cycles:
You can use the photo sensor and have it open at dawn and close at dusk every day. Our door has some advantages over our competition, it takes several minutes of the light transition before it decides to open or close.
Let me give an example where that matters. Let's say someone drives up and parks the car with the headlights on (dropping off your teenager after prom?). If that light hits any of our competitor's door, it will open in a couple of seconds allowing any lucky raccoons into the coop. And it will close when the car leaves, with the raccoon locked inside. With the several minute delay built into our door, we don't have that issue.
Also, you can delay the opening and closing times separately by 30,60, or 90 minutes. Let's say you have some young hens who stay out a bit late, just give them a 30 minute delay and they'll make it into the coop. When I had ducks, they needed a full hour delay because they are just party animals (you know it's true!). Note, all of our photo sensors come with 10 feet of wire so you can easily position them to avoid street lights or motion lights. And all of our doors are 'programmable'. You can override the photo sensor if it's there. You can set it to open at any time and close at any time, let's say you want it to open at noon and close at 8:27pm. Easy to do.
For the solar panel, those instructions are included with the door. It simply plugs into the battery. We build a voltage regulator into the solar panel so that it won't overcharge the battery during daytime or discharge it at night. With our solar panel, our batteries typically last at least 5 years, usually closer to 7 years. And it is a standard 12v 5 amp-hour lead acid battery, available almost anywhere. You can see the instructions for it here: (page 3)
https://chickendoors.com/instructions/manual/ (note it is in .pdf format).
My apologies for being long-winded, but I like to be thorough.
Thank you.