How to Make a Solar Car Battery Charger

How to Make a Solar Car Battery Charger

In this day and age, it is important to be more ecologically aware and find ways to help the environment. One example is finding sources of renewable energy. Solar power is one of the best options to go with – as it can effectively help you reduce your carbon footprint. The great thing about solar power is that you can also apply it with how you manage your vehicle.

A solar car battery charger can be very helpful for vehicle owners. In this article, you will be provided with all of the instructions so that you can make one on your own.

1. Using a Solar Panel and a Voltmeter

The simplest way to utilize solar energy is through a voltmeter and a solar panel. Have the solar panel connected to the car’s battery and wait until the voltage level rises. Once you see that the voltage reaches 14 volts, this means that charging has already been complete. It is then the time to disconnect the solar panel from your vehicle’s battery. Failure to do so will just lead to an overcharge.

One thing that you should note is that charging too fast can be harmful to the battery. The battery can malfunction if power rushes too fast. This means that you should make sure to only get an adequately sized solar panel. You should also research first about the battery capacity in terms of power, charging, and discharging – all of these you can find from the instruction packet from the battery manufacturer.

You can also note that some solar panels are only created for the sake of maintaining battery levels in vehicles that were stagnant for quite a long time. Most solar panels do not go over 14 volts – which means it will not bring too much current to harm or overcharge your batteries.

2. Setting Up The Voltmeter and Solar Panel

Inside your vehicle, this is what everything should look like. First, have the voltmeter displayed. This accessory will help you monitor the power. If something short circuits or if an item disconnects, you will be able to see the voltmeter display to show zero.

If the voltage appears to jump as high as 17 volts, it might also mean that the solar panel current is not being transferred to the battery. There might be problems with the jumper cables used.

If the voltage appears 14 volts, you will be able to hear a bubbling sound. This means you have to cease operations as you are overcharging already.

3. Tricks For Avoiding Overvoltage

If you want to stay safe from overvoltage, you can opt to get a ‘7 Amp Charge Controller’. This will cease connections to the battery when the voltage reaches 14 volts and above. This can be helpful as an additional precaution measure to make sure that you and your battery are safe.


Charging your car battery using a solar panel can be very helpful – not only for you but also for the environment. This is also very cost-efficient, especially in the long run. It might take time to master everything, but the rewards are priceless.

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