I used 12v dc from a 13 plate car battery to power a 12v dianamo dc motor and brought in an alternator to change the battery using the rotation of the dc motor.on the same battery I contacted my power inverter to generate 220v ac for my lighting system, thinking I have the alternator connected to the battery so the battery source will never deplete.but it kept draining.please what do I do to make the battery maintain it powerful while using