How Long To Charge 12 Volt Car Battery. There are some real drawbacks to having a 40 amp car charger. A 2 amp trickle charger can charge a 50 discharged small car battery 200-315 CCA or RC 40-60 in about 11 to 14 hours a mid-sized battery 315-550 CCA or RC 60-85 in 14 to 18 hours or a large car battery 550-1000 CCA or RC 85-190 in 18 to 35 hours.
Likewise a 2 amp hour charger will need 18 hours. A 12-volt battery could take up to 12-24 hours to charge fully. There is not an average time for charging a battery.
Battery voltage reacts highly to charging and discharging.
The following assumptions are made for answering the question. The short answer is in most cases depending on the size of the battery it will take around 5 8 hours to fully charge a 12-volt car battery with a solar panel that can produce 1 amp of current. Experienced RVers try to use no more than 20 to 50 of the energy available in a battery. For 6v batteries the first charge should be 10 hours with regular charging taking 6 hours.
