I have a wireless surveillance camera that works with a 9Volt battery, or DC plug in. I want to use a solar panel and a rechargeable battery to run the camera. I am not sure what is needed. I was thinking using a 12V rechargeable battery, and have the solar panel recharge it in the day, but also want it to run the camera off it around the clock. What do I need so I don’t over charge the battery or ruin the equipment?