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.
Gordon B has it dead on. Each cell in the battery when fully charged produces 2.1 Volts. Multiply that by six, and a fully charged battery produces 12.6 volts. When the alternator is charging, depending on the state of charge for the battery, at approximately 1500 RPM, the voltage should be 14.5 to 14.9 Volts.hen the battery is fully charged and the engine is OFF, the nominal voltage across the battery is approx 12.6 volts. With the engine running (above 1000 RPM) it should be 14 - 14.6 volts.