Solar batteries are also known as a solar power battery or solar battery storage system. The main work of these batteries is to store energy generated from the solar panels for later use. These solar batteries are designed to connect with solar inverter for power backup.
All types of solar systems generate electricity with the help of Solar PV panels during sunlight and run the connected loads and export the extra electricity to solar batteries storage with an off-grid solar system and hybrid solar system. Solar batteries work as an energy storage system and they save energy as DC energy and therefore, we will need a solar power inverter to convert the DC energy into AC energy.
The cost of a solar battery depends on its type of chemical uses in the battery system, battery life cycle, storage capacity, and usable capacity
Types of Solar Battery
When we evaluating solar battery options we should compare some specifications such as technology, brand, life cycle, efficiency and maintained, etc.
Types of solar battery or batteries
Solar batteries are of several types and having a number of technologies, but Lead-acid Tall Tubular and Lithium-ion batteries are the most successful batteries for the solar power storage system and their applications.
Tall Tubular Solar Battery
A lead-acid tall tubular solar battery is the advanced version of normally used at our home. It is designed according to their solar applications. Mostly solar tubular batteries are used in the off-grid solar system, solar home rooftop system, and solar street light.
In solar applications, batteries required to be charge at low ampere. So, Lead-acid tall tubular solar batteries are designed in C-10 types for their slow charging capabilities.
Advantages and Disadvantages of Lead-acid Tall Tubular solar battery
|1200 – 1500 life cycles||Heavy in weight|
|Maximum 8 years life||Required refill of acid regularly|
|Low price & maintenance||More space required|
Lithium-ion Solar Battery
There are different types of lithium-ion solar batteries. Lithium iron phosphate (LiFePO4) is the best for solar power applications. LiFePO4 batteries are completely safe, unburnable, stable for 16 to 20 years, hassle-free and maintenance-free. It performs well with low resistance and electrical performance also a very good level.
A lithium-ion solar battery is generally used in E-rickshaw, solar Street lights, solar vehicles, and battery banks. The main advantage of LiFePO4 battery is the good thermal stability, Improved safety, in addition to the high current rating and long life cycle.
Nowadays solar batteries for home with solar panels are increasingly focused on LiFePO4 batteries, which are helpful in cost reduction in recent years.
Advantages and Disadvantages of Lithium-ion Batteries
|Upto 5000-6000 life cycles||More Expensive compare to others|
|15-20 years lifespan|
|Low maintenance cost|
|No any type of refilling required|
|Light in weight and acquire less space|
|The high amount of energy density|
|Fast charge and discharge quality|
|High efficiency up to 98%.|
Price of Solar batteries
Generally, solar batteries price starts from 20 AH @ Rs.2600 to 200 AH @ Rs. 12,000. The price of solar batteries also depends on its brand and quality. Batteries Companies gives 3 to 5 years of warranty and some brands will replace it with a new battery during the warranty period. Some brands promote buyback offers where the new one is replaced by the old ones.
Calculation of solar battery backup
- The standard of solar batteries comes in 12 volts.
- The number of solar batteries depends on the volt of solar inverter.
Standard backup with solar power systems:
|Kilowatt||Volt||No of Batteries|
|1 kw Solar system||24 volt||2 batteries of 12 volt each|
|2 kw Solar system||48 volt||4 batteries of 12 volt each|
|5 kw Solar system||96 volt||8 batteries of 12 volt each|
|10 kw Solar system||120 volt||10 batteries of 12 volt each|
Decrease and increase battery storage system.
- All Solar systems come with standard battery back for 6-8 hours.
- We can increase our battery backup by adding a higher AH rating battery or we can double the number of batteries.
- We can decrease the battery backup by using lower AH rated batteries.
How to choose a good solar battery?
- Go with a reputed solar company
- It’s better to install the solar battery and inverter of the same brand.
- Tall tubular solar batteries are cost-effective. Whereas Lithium-ion is far better but expensive.
- Go for 150 AH rating battery with at least 5 years warranty.
One more important component of a solar battery system is the solar inverter or solar charge controller. It is helpful to ensure that the energy produced during the day does not overload the battery.
and it also prevents the power stored in the cells from running back into the solar panels and destroying the battery overnight.