Choosing the right solar battery for your solar light is essential to its optimal performance. Whether you are replacing a battery in an existing solar light or selecting one for a new solar light, there are several factors to consider. Knowing the purpose and usage of the solar light, the type of solar panel, the battery capacity, and the environmental temperature are essential for selecting the best solar battery for your solar lights. With the right battery, your solar light can provide reliable illumination that can last for years, making it a smart and economical choice.
Main types of solar light batteries in the market
When searching for the right batteries for your solar light, you will have many options to consider.
Lead acid battery
Lead acid battery is a type of battery whose electrode is mainly made of lead and oxide, and the electrolyte is sulfuric acid solution.Lead-acid batteries have been around for years and have established themselves as one of the preferred batteries in the market. They were the first rechargeable batteries ever created. Although they have high power surges, Lead-acid batteries discharge faster than other modern batteries. There are three types of Lead-acid batteries which include:
Sealed/maintenance-free Lead-acid battery: This lead-acid battery has vents and valves that are kept open to release pressure inside the battery in case the pressure builds up. The pressure can build up because of rapid charging or high current surge when discharging.
Starter: This Lead-acid battery is designed to provide a high-voltage surge for a few seconds. It is commonly used in vehicles to start the engine.
Deep cycle battery: This Lead-acid battery is designed to continuously provide power in golf carts, wheelchairs, and other electrical equipment. They are built to provide maximum power capacity and higher operational cycles.
These batteries are commonly used to power anything from a car to a solar light since they are inexpensive.
The Gel battery is a lithium acid battery that valves to regulate the flow of electrolytes. This battery uses sulfuric acid and an electrolyte combined with silica fumes. It is an old model battery but emits fewer fumes than the Lead acid battery. The Gel battery can be used in areas with poor ventilation because of the low fumes that it produces. The gel battery does not need any maintenance as it uses valves that open to allow the internal gases to combine with water. These batteries are versatile and robust.
Ternary lithium battery
The ternary lithium battery is a type of lithium battery that uses ternary materials as the cathode. The cathodes for ternary batteries are made from aluminum, cobalt or nickel. Ternary lithium batteries are preferred for solar lighting because of their higher energy density than lead-acid batteries. The nickel used in ternary batteries improves the conductivity of the batteries, efficiency, and cycling.
Lithium iron phosphate battery(LifePO4 )
The lithium iron phosphate battery is a battery that offers high energy density and a high capacity. These batteries are designed to offer high cycles and reliable performance in a wide range of operating temperatures.
Compared to other batteries, the Lithium iron phosphate battery has a lighter weight, more lifespan, and greater performance and reliability. This battery has a faster charging rate and stores power for longer. This battery does not need active maintenance in its service.
These batteries are the lightest weight variety of batteries and are the least expensive among all the other solar lights battery types.
Different solar light battery type
|Battery type||Nominal cell voltage||Battery pack voltage||Cycle Life||Cost||Temperate performance|
|Lead acid battery||2.2V||12V||350 times||low||-20℃-50℃|
|Gel battery||2.35-2.4V||12V or 24V||500 times||low||-15 ～ 40℃|
|Lithium Iron Phosphate battery(LifePO4 )||3.2V||12.8V or 25.6V||1500-2000times||high||-10℃~60℃|
Lead acid battery: A lead acid battery has a nominal cell voltage of 2.2V and a total voltage of 12V. This battery can be charged 350 times reliably and does not heat up during charging. The charging temperatures of this battery are 20-50 degrees C. This old model battery is bulky and unsuitable for modern solar lights apart from the split type of solar lights. The battery is also heavy and bulky.
Gel battery: This battery has a nominal cell voltage of 2.35 to 2.4V and a total voltage of 12V or 24V. This battery can be charged 500 times and has a considerably low cost. The charging temperatures of this battery are 15-40 degrees C. The Gel battery is also not suitable for modern solar lights. This battery can be damaged by overcharging. It requires proper regulators to ensure that overcharging does not occur. The Gel battery is not suitable for use in high temperatures. Higher temperature causes the cells to shrink making the gel hard.
Ternary lithium(Li-ion): This battery has a nominal cell voltage of 3.7V and a total voltage of 11.1 (12)V. It can be charged for 500 to 800 times and has a low self-discharge rate. This battery comes in different shapes and sizes, so it is not interchangeable among various devices. The main advantage of this battery is its high energy capacity.
It is ideal for use in solar lights because it plays a key role in increasing reliability, reducing maintenance costs, and increasing energy efficiency compared to other batteries currently on the market. Ternary lithium(Li-ion) is also reliable because it can withstand high operating temperatures.
Lithium Iron Phosphate battery(LifePO4 ): Compared to many other types of batteries, this battery has a longer life span. It also does not lose its charge even when it has not been used for a long time, unlike other batteries. It has a nominal cell voltage of 3.2V and a total voltage of 12.8V or 25.6V.
This battery is ideal for high temperature operating conditions. It can withstand temperatures of up to 60℃. The Lithium Iron Phosphate battery does not need active maintenance. It can last for up to 2000 cycles.
How does Solar battery influence solar light lifetime?
Many factors, including the solar light battery type, the battery cycles life, the environment temperature and the stability of the battery can affect how long your solar lights last. influence the solar light lifespan. For example,in hot weather countries the environment temperate is nearly 55℃, Lithium Iron Phosphate battery is the best, safe and reliable choice.
When looking for a solar battery to power your solar lights, you should consider the application environment, life cycles, stability and battery pack voltage and your budget.
Which type of battery is best for solar light?
Lithium Iron Phosphate battery(LifePO4) is a perfect and reliable option for many solar lights, especially for All in one solar street light. The cost of Lithium Iron Phosphate battery(LifePO4) is higher than other types of batteries, but the reliability is much better,especially the high temperature performance and longer life cycles.