So long as the controller produces a slightly higher voltage than the battery, it will charge the battery. A diode can prevent reverse flow. You may need something to prevent overcharging of the battery. The presence of a cigarette lighter plug is just a method of connecting the wiring. If everything else is good, it will present no problems. You can buy cigarette lighter solar panels on Amazon.
This reply was modified 9 years, 2 months ago by Pippi.
This reply was modified 9 years, 1 month ago by Pippi.