When you hook up your 12W or higher solar power panel, remember you need to have a charge controller. This 8A Charge Controller regulates the current and voltage going to the battery. This extends the life of your battery and keeps your battery functioning in peak form. It also allows for a full and complete charge. You don't have time to deal with a battery that isn't perfect, especially when you need to use your electronics NOW. Nature Power has your back. You play, they'll watch your battery for you.