Auto Battery Charger Output Voltage

Voltage at the charger should be higher or equal to the battery.

Auto battery charger output voltage. When a car drops for instance from 12 6 to 12 0 there will be 75 difference. This all depends on battery type state of original charge and the charger type itself. Knowing how to test a battery charger whether it s for the rechargeable kind used in small appliances or the one that powers your automobile can be useful for making sure that the device is reloading batteries to a usable level the procedure for testing a battery charger is similar regardless of the type of battery you re working with. 12 volts is the standard automotive battery in today s vehicle and each of the battery has 6 cells with a voltage of 2 1.

I am guessing 12 5 volts without charger and 14 3 with charger. Checking charger output measure and record the voltage at the charger. Measure and record the voltage at the battery. If it is not the charger is malfunctioning and must be replaced.

Most modern chargers will not do anything if no load is detected. Gassing due to overcharging also uses up the water in your electrolyte and in sealed batteries will fairly soon ruin the battery. To get a true voltage reading of the cars battery it is important to measure the voltage after the car has been sat for a period with the engine off preferably overnight this provides you with the car battery open circuit voltage or also know as the resting voltage. The properly sized charger will give the battery as much current as it will accept up to charger capacity 25 of battery capacity in amp hours and not raise a wet battery over 125 f or an agm or gel valve regulated battery over 100 f.

A regulated charger will hold the voltage to 13 5 to 13 8 volts once the voltage has peaked to prevent gassing and overcharging and the current will drop to almost zero in a healthy battery. Connect the positive and negative test probes of a. Touch the ground lead the black lead on the voltmeter to the negative or ground lead on the charger. If you want to charge a 12 v battery then set the charging voltage to 14 1 0 7 14 8 v as diode d10 drops around 0 7 v approximately by rotating wiper of rv1 preset in clockwise direction very slowly until the output voltage reaches to near 14 8 v.

This battery charger system with auto cut off system. If anyone have a idea about is please share with me. The voltage output on the voltmeter should be the same as the voltage setting on the charger. Troubleshooting 12 volt auto battery chargers.

You should see a change in voltage. On july 31 2012 at 9 20am. Test the battery with and without the charger. A fully charged car battery voltage should be 12 6v or above this is with the engine off.

You need a load for the charger. Adjust rv3 in same way to set the voltage to exactly 14 8 v rv3 adds better. A fully charged car battery has 12 6 volts. There is a very big difference when a car battery drops even a small amount of voltage.