I have some battery powered roller shades that I'd like to convert to using rechargeable batteries using a solar panel as the charger. My blinds are Norman Pro-Lift 25 CE blinds. They run off a long tube of 8 AA batteries in a series (so 12V when fully charged).
I found a 12V solar panel that seems made for this purpose on Amazon:
I purchased one unit so I could test with it. From my the inside of a window it actually got up to 19V output. For amps it's supposed to get up to .08, but I'm seeing .01 so far but it's pretty cloudy today.
Would it be as simple as replacing the AA batteries in the tube with rechargeable AA batteries and then connecting the battery tube to both the solar charger and the roller blinds motor?
What type of batteries are best?
I am unable to get an answer on whether the solar charger shuts off when the batteries are fully charged. Assuming the charging does not shut off and is exposed to sunlight 6-8 hours a day, would it be reasonable to expect the batteries to last a year?
I can't find any details on the above solar charger, so I don't know if it has an integrated diode to prevent the batteries from discharging into the solar charger at night, how quick will the batteries discharge? Perhaps this would actually be helpful to prevent batteries from getting overcharged? Or will the batteries be completely drained after a single night?
Any other tips on how to make this project would be appreciated. Thanks!