Find answers to all questions with us

# How do you charge two 12-volt batteries in a series with a 12 volt charger?

## How do you charge two 12-volt batteries in a series with a 12 volt charger?

One basic configuration for charging batteries in series is to connect the positive charger output (in red) to the positive end of one of the batteries. Then, connect the negative end of the battery to the positive end of the next one, and continue to do so for the rest of your batteries.

## Can you charge battery with cables still connected?

It is completely safe to charge a car battery while still connected — as long as you follow a few precautions. The good news is, any trickle charger, jump starter, or battery maintainer designed for a car will fall below this benchmark. Smart battery chargers are the safest option for this purpose.

What happens when you connect two 12-volt batteries in series?

Two or more 12-volt batteries wired in parallel—positive to positive, negative to negative—is still a 12-volt system. Two or more 12-volt batteries wired in series—the positive terminal of one battery connected to the negative terminal of a second battery—develops 24 volts, but amperage doesn’t change.

### How do you charge a 24 volt battery with a 12 volt charger?

This requires only one bank of a 12V charger to be attached to the positive terminal of the first battery, and the negative terminal of the second battery. In the second example, to charge a 24V system simply use each bank of the charger on each 12V battery terminal leads.

### Do I need to disconnect both battery terminals when charging?

Important: The cable which is connected to the negative terminal must be disconnected first. This prevents a short circuit between the positive terminal and ground. Then disconnect the red cable which is connected to the positive terminal.

Can you charge a 12 volt battery with a 24 volt solar panel?

Yes, you could do it. The voltage isn’t too much of a concern, it is the current the panel can provide. What is commonly known as a 12V panel is usually a 36-cell module with an open-circuit voltage of 22V, making maximum power at 18V.

#### How do you charge two 12V batteries in series?

The two basic choices are getting an appropriate 24 volt charger or doing a bit of disconnecting and reconnecting so that the batteries can be charged in parallel with a 12 volt charger, which is a much more commonly available and less expensive charger. That’s excellent advice from Quirkeyquantummechanic and well said I might add.

#### Can a 12 volt charger be used with a 24V Charger?

You need to overcome the total voltage of the series batteries (12 V + 12 V = 24 V) to drive electrons “back into” the batteries to restore the charge. It may work better to use a 12 volt charger and just disconnect the link between the batteries and charge them in parallel, but the setup may not support separating the batteries that way.

Can a 12 volt battery be wired in parallel?

Batteries may be wired in parallel or in series. Two 12-volt batteries wired in parallel continue to produce 12 volts, but the capacity doubles. Two 12-volt batteries wired in series produce 24 volts, but the capacity remains the same as one for a 12-volt battery. Charging 12-volt batteries wired in parallel requires a 12-volt battery charger.

## Which is the correct charger for a 6V battery?

While selecting the correct charger to charge and maintain batteries which are wired in series using Genius or GEN Chargers, the battery system must equal out to 12V (unless using the 24V mode on our larger chargers, the batteries must equal 24V). In the examples below, two 6V batteries in series = 12V.