< img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=363518808911477&ev=PageView&noscript=1" />

5 Solar Battery Specifications to Know About

A solar system battery bank
A solar system battery bank
Resource: https://youtu.be/WF-O_xy-f_A

Solar battery specifications are crucial when choosing a storage solution for your solar installation. They define its suitability based on your needs, ensuring proper sizing and compatibility. These solar battery specs, including their role when assessing performance characteristics, are discussed in this post.

Solar Battery Meaning

A solar energy battery is an electrochemical device that can store the electricity generated by a PV array. Depending on your energy needs, this can be a single unit or a pack of many batteries connected.

Being rechargeable, this type of battery will store energy many times during its lifetime, allowing you to utilize it when the panels are not actively producing power.

You can use a solar power battery in many ways: to power different circuits and appliances in your home, in an RV when camping, and for many other outdoor applications such as powering electric lights.

How Do Solar Batteries Work?

Although solar battery features vary from one type to another, the typical unit contains an electrolytic solution. This solution provides the ions needed to allow the movement of electrons from the force of an external power source to an external circuit.

When being charged, a solar battery has electrons move from the negatively charged electrode (anode) to the positively charged electrode the cathode. This movement, caused by the external charging voltage, leads to the battery’s storage of electric energy.

When the battery is discharged (supplying power), the opposite happens: electrons move to the opposite electrode, but this time, through the external circuit connected to the electrodes. Typically, that’s how solar batteries work.

Solar storage battery
Solar storage battery
Resource: https://www.t6forum.com

Solar Battery Specifications

Solar battery specifications describe its capabilities, including size in KW, energy capacity expressed in kWh, and discharge time. Others are the battery’s efficiency and lifespan based on the charging cycles.

These are crucial details when sizing a battery for solar storage, or the battery will not fit the intended applications, among other performance issues. Here, we explain the specifications.

1. Solar Battery Size

Although this can refer to the solar battery dimensions, our focus here is on its size in terms of electrical energy. This is typically measured in kW and used to mean the power the battery can hold when fully charged. In other words, solar battery size indicates the kind of circuits or devices you could use it with, but based on their power ratings.

As an example, most home solar batteries are rated 5kW. A bank of these will adequately power several circuits in a typical home. Thus, The solar battery size determines its suitability for a particular application, whether residential or commercial.

2. Solar Battery Capacity

Measured in kWh or kilowatt hours, the solar battery capacity describes the amount of energy the device can supply for a specified period, usually based on the fixed discharge rate. For a battery rated 10 kWh powering a 1kWh circuit, that would mean about 10 hours of supply before the battery needs recharging.

Other factors would also apply, though, such as the operating temperature and the type of battery. It’s good to note that the nominal operating temperature is indicated at 25 degrees Celsius when it comes to solar battery specifications.

Solar power batteries as small as 2kWh are available with smaller systems. The solar panel battery size can reach up to 50kWh or even higher for larger installations. Usually, a storage system will be a battery bank composed of a few too many single units connected.

3. Solar Battery Discharge Limit

The solar battery discharge limit means the specified amount of energy that it can provide or discharge before it needs to be charged again. In other words, this is the maximum amount of stored energy you can safely draw, also called the depth of discharge or DoD.

When sizing a battery, therefore, the solar battery depth of discharge is one of the essential features to keep in mind. That’s because some batteries offer higher DoD values than others. For instance, a lithium ion’s discharge limit is 80% compared to the 50% of lead acid types.

The solar battery discharge rate is typically dependent on capacity and is normally expressed as mAH or milliamp hours. During charging, your solar charge controller will usually take care of that and will not allow the battery to discharge beyond its allowable limit.

4. Solar Battery Efficiency

Solar battery specifications for efficiency describe its ability to store or supply energy. Although no battery can attain 100% efficiency, expectations require that the figure be as high as possible.

The solar battery efficiency depends on its type, with lithium-ion batteries (despite their costs) offering higher values for this spec. That means you can expect to get more out of this type in terms of charging speeds and power output.

5. Solar Battery Lifespan

The solar battery life is an estimate of its charging cycles. A cycle is said to be completed when a battery is charged, discharged, and then charged once more. The more cycles a battery is designed to have, the longer you can expect it to last, although that also depends on several other factors.

Some of the other factors that can affect the lifespan of solar battery storage devices include their operating temperature and maintenance requirements. Higher temperatures cause rapid discharge rates. This can cause damage.

Improper maintenance can also shorten the lifespan of solar battery storage systems. This is while taking into consideration that some are more demanding to maintain than others.


Solar Battery specifications are crucial indicators of its performance characteristics when being used. In addition to helping you size your specific storage system, they can guide you on the correct battery based on budget and other needs. The specifications explained in this article are the most critical. They should help you when choosing a battery for your PV system.

Table of Contents

Request A Free Quote