Charging a car battery from 0% to 100% typically takes about 8 hours.
in order to fully charge your car's battery, you usually need at least ten-percent of the overall capacity of the battery in reserve for emergencies or activity that might spike power consumption. this can be roughly calculated by multiplying all available storage on your batteries times five.
so if you have 480 amp hours of storage on each of two 12 volt batteries in your bank, then 600 x 2 =1200. you'll need 1800 watt hours for a full charge and a charger with 1800/24/10 = 50 amps would do this nicely. however, i'd recommend sizing your charger according to what's known as minimum load – if you connect
how long does a car have to run to charge a dead battery?
all cars have a battery in the engine. the battery provides some power to crank the motor when starting, and powers other electronics on the vehicle. all vehicles also have a 12-volt auxiliary electrical outlet for operating things like ducted heating and air conditioning systems, radios, portable tool chargers etc. a good way to measure how long you need to run your car is by looking at how big your car's engine is–those who own small larger engines will only need about 15 minutes running time while those with large luxury vehicles may need up to ten hours of driving time.
moreover, any changes in ambient temperature can dramatically influence how quickly a battery recharges so this last point should be taken into consideration before planning ahead.
can a completely dead battery be recharged?
a 100% discharged battery can be recharged with a little patience. connect the negative of the charger to the metal shell of your car's hood and the positive terminal of the charger to your car's contact point on its battery (typically it sits near and behind one of the front tires, and will usually be labeled as such). then wait 15-20 minutes for some electrons to pool at that contact point, which you then use to wirelessly recharge your dead battery. you should see some response from your dashboard or glove box lights; if not it might mean you need a new inverter as this article goes on, but more often than not it means something is wrong with your starting batteries/inverter.
is 30 minutes enough to charge a car battery?
no. aim for about an hour to be safe.
for best results, take off or open the battery's air vents and connect the powerplus next to the terminals before charging. be sure not to do it in front of spark plugs, electronics etc. safety first!
start by grounding your car battery charger next to the car battery with a solid connection – there should be black wires coming out of one side and white wires coming out of other side for this purpose. connect both clips on top of charger into positive (+) & negative (-) sides on either end of battery, then cable from negative connector should clip onto other vehicle body metal surface close by using other cable attachments that are available in set. safely re-route