Can solar batteries be used in cars?

By Matt •  Updated: 05/03/21 •  5 min read

Yes. It is possible to use solar batteries in cars. Ultimately the purpose of the batteries in the car is to power the lights, equipment and help in starting the car. Unless the solar batteries are compatible to support the power connection in your car, you can use any battery in the car. 

Is it ok to use a deep cycle battery in my car?

Deep cycle batteries are quite heavy. You can use them in the car comfortably. However, deep cycle batteries have some pros and cons. The deep cycle battery would have limited power bursts which sometimes cause the problem while using them. 

Solar Inverter
Solar Inverter

The storage batteries can start the engine and power the headlights and electric equipment in the car. Not good the storage, but it does the job well. 

Can a solar battery start a car?

The solar battery can start a car. However, they are not suitable in the region where the temperature reaches the freezing point. Most solar batteries are made of a Lithium-based battery or lead-acid deep cycle battery. 

These batteries are highly efficient, but none of them generates sufficient power to replace the current car batteries.

Is it possible to use the Car batteries for solar?

There are several similarities between car batteries and solar batteries. However, they are meant for different purposes. Car batteries are designed to generate a short burst of power to start the engine. 

These types of batteries are not suitable for storing solar energy. Solar batteries are generally deep cycle batteries. 

They are manufacture to last longer without discharging. It will power your system for a very long period. 

It will keep powering the system until the complete depletion. You can recharge this battery by using the solar panel.

What sets Solar batteries apart from car batteries?

Several factors affect the performance of car batteries compared to solar batteries. Every battery is design for a different purpose in mind. At the same time, car batteries are designed to start the engine and power the lights. 

It would be difficult to use these batteries for solar energy storage. You cannot power the home with car batteries due to the low voltage supply. 

In contrast, solar batteries are deep cycle batteries design to store maximum energy during the day when connected to the solar panels. The discharge rate of the solar batteries is prolonged. It can power the equipment for very long periods. 

Repeated recharge is possible with solar batteries. You will find the two types of batteries in the market, which include lithium-ion and lead-acid batteries.

Why is Lithium-ion batteries used in the solar?

Lithium-ion batteries are most common in solar batteries. They are taking the lead in the home batteries for energy storage. 

It is lighter compared to the car batteries. Another quality of the lithium-ion battery is the depth in the discharge rate. It is highly efficient for the long hours to use with the extended lifespan. 

Typically the Lithium-ion batteries last for years and serve the purpose very efficiently. No much maintenance is required and can be used for several years without spending a dime on the repair.

What is the use of Lead Acid batteries in solar?

Lead-acid batteries are made of chemicals that react to certain metals to produce the electron that moves freely from positive charge to negative charge. The movement of the electron generates the power for the equipment. It can produce power over a long period without needing the charge. 

However, each time the lead-acid battery is charge and discharge, they lose some portion of the battery capacity. 

Over time the lost capacity would result in a decrease in the performance. It will also shorten the lifespan of the battery.

Lead-acid batteries are typically used in car batteries as they are the best source of instant energy for starting the car with a short burst. 

The car batteries are kept in a lethal environment and have to go through different environmental conditions. 

Therefore these types of lead-acid batteries are suitable for cars. Compare to solar batteries, and car batteries will not lose performance when using in a freezing environment.

 It performs well and keeps powering the car for long hours.

Final verdicts:

Solar batteries are useful when you do not have any other options, especially in emergency conditions. Solar batteries are excellent in performance, but they lack some of the crucial features. 

Comparing to the car batteries, which are powerful enough to generate the instant energy burst to start the engine, could only be possible in the particular type of batteries. 

Both types of batteries are design for a specific purpose and can be used as an alternative in some situations, but they cannot replace each other. 

Ultimately the performance determines where and for what purpose the batteries will be used. 

Batteries industries are going through the change, and we may see more highly advanced batteries in the company years that may have multipurpose use.


I’m Matt, a computer and electronic embedded system developer. Currently, working as an electronic engineer. In my leisure time, I do love to blog about technology stuff. Specially, new advance high tech devices. Portable solar systems are one of topic that I love to investigate. They are becoming more powerful day by day which keep me alert.