Trying to understand. Are you saying you have a solar piece of equipment that won’t take a charge in sun light or otherwise?  I’m no expert on this but I know battteries, at best, have a limited lifecycle. Even those rechargeable solar ones. If it won’t take a charge then either your solar component (I dont know what they can that specifically, or your batter has lived past its expiration  date. Other than installing a new batter or the proper solar sensor, I dont think there’s much that can be done except for you to replace the entire things. My point is, there’s probably nothing you can do to “fix” this. 

Hi Alan,

Please try place your sensor under direct sunlight for about 3-5 days, then press the power button again to see if it works.

If you have incandescent light bulb (not LED) at home,  you can place your sensor under the light bulb for about 2 days and check if it works. 

Thanks,

Wency