# What should the charging voltage be on a car battery?

## What should the charging voltage be on a car battery?

Charging voltages over 14.7 volts can prematurely dry the battery by boiling out electrolyte, and increase risk of a battery hydrogen gas explosion. In this case the battery charging voltage is 14.61 volts with the engine at high idle. 14.4 volts is the gassing threshold.

What is the state of charge of a 12 volt battery?

I put together the following battery state of charge chart which indicates the state-of-charge (percent) as it relates to battery voltage or specific gravity. Voltages and Specific Gravity are listed for a 6-volt or 12-volt battery, and battery banks of 24 and 48 volts. The chart is listed below. But first, a few important notes and caveatsâ€¦

What should the voltage be during bulk charge?

Bulk Charge – The first stage of 3-stage battery charging. Current is sent to batteries at the maximum safe rate they will accept until voltage rises to near (80-90%) full charge level. Voltages at this stage typically range from 10.5 volts to 15 volts.

### How many volts does a lead acid battery need to charge?

A single lead-acid cell starts to charge at anything over 2.25 volts. Since a 12 volt battery has six cells, any 12 volt lead-acid battery needs at least 13.8 volts to startto 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.

How many volts does a car charger use?

This is because all modern automobiles have a 12 volt, DC electrical system. A VOLTAGE REGULATORregulates the charging voltage that the alternator produces, keeping it between 13.5 and 14.5 volts to protect the electrical components throughout the vehicle. There is also a system to warn the driver if something is not right with the charging system.

What is maximum voltage during charging of 12 volt battery?

The charger has been charging the battery for about 8 hours and presently the voltage is 15.0 Volts (reading taken with multimeter while charger is attached to battery and charging). Presumably the 0.5 amp criteria has not been met, because the charging cycle continues, unabated.

## What should the charge voltage be on an alternator?

Turn on the high beams for 10 seconds and then turn them off. Measure battery voltage across the battery posts with your DMM. You should get between 12.4 and 12.6V. This means your battery is fully charged. If you get a reading below 12.4V, charge the battery before continuing. 5b. Measure the Charging System’s No-Load Voltage

Bulk Charge – The first stage of 3-stage battery charging. Current is sent to batteries at the maximum safe rate they will accept until voltage rises to near (80-90%) full charge level. Voltages at this stage typically range from 10.5 volts to 15 volts.