In the right corner it's....Sir Gawain! He is nephew to King Arthur, and an honorable knight of Arthur's Round Table. He is very popular with the ladies, and quite charming. He is loyal to his king and queen and keeps his promises.
To charge the battery, the alternator voltage output has to exceed a minimum charging voltage. This minimum charging voltage is 13.8 volts dc across the battery terminals, or at the output of the alternator. A single lead-acid cell starts to charge at anything over 2.25 volts.ince a 12 volt battery has six cells, any 12 volt lead-acid battery needs at least 13.8 volts to start to charge. This voltage will be enough to fully charge or maintain the battery on a trickle charge, but charging time will be very long at 13.8 volts.
It will take forever and a day to charge a deeply discharged deep cycle battery.......... consider that a small 110v battery charger is putting out 3-5 amps (or 3 x 110 =330 Watts) and the alternator on a car is putting out 20 to 50 amps at 14 volts (280 to 730 Watts).Source(s):atts = volts x amps a 12volt battery needs an incoming current of at least 13 volts to charge it; 13.5 volts is better. so if the output VOLTAGE of the panel is less than 13 volts it wont do anything. Even if it is, 10 / 13.5 = .74 amp.(three quarters).