The solar industry in India has been on the increase, with more and more households and companies adopting solar panels in a bid to save their massive electricity bills and as an alternative source of power. During the daytime, solar panels have the capacity to generate electricity, but they require solar batteries to store the power and use it during off-peak hours.
But one of the main problems which owners face is: what is the most appropriate size of solar battery to use? And are the prices of solar batteries affordable enough? A lot of buyers are unaware of the significance of this relationship. Selecting the wrong battery size would not only add to the initial buying cost, but it would also add to the cost of maintenance in the end.
Consequently, it is important to know the precise correlation between the size of the battery and the price. Through this guide, we will clarify what prudent buyers need to know before purchasing solar batteries.
What Does Solar Battery Size Mean?
The solar battery size is used to refer to the overall power storage of the battery. It is determined in KiloWatt-hours (kWh). A kilowatt-hour is a unit used to measure the amount of energy an appliance consumes in one hour.
For instance,
- A 5 kWh battery can power a 1 kW load for 5 hours.
- A 10 kWh battery can power a 1 kW load for 10 hours.
The typical batter size used in Indian homes is as follows:
| Battery Size | Ideal For |
| 3-5 kWh | Small homes, Basic backup |
| 5-7 kWh | Medium house, Essential Appliances |
| 10-15 kWh | Large homes with higher consumption |
| More than 20 kWh | Villas, Commercial Setups |
It is important to note that you do not need a battery to cover your whole day’s consumption. You will only require it during non-solar hours or power outages. It will only be needed during non-solar times or during power outages.
What Determines the Solar Battery Price per kWh in India?
Comparing batteries cannot be based on the sticker price, but on the price per kWh. The cost of a unit of storage capacity is known as the solar battery price per kWh. It assists you in the comparison of the various batteries, capacities, and chemistries. The following are some of the aspects that determine the price of the solar batteries in India:
1. Battery Chemistry
The battery technology plays a major role in pricing. Some of the common options include:
| Battery Type | Price/ per kWh | Benefits | Drawbacks |
| Lead Acid Battery | โน8,000 – โน15,000 | Easy to service, compatible with most existing inverters | Shooter’s life cycle, lower depth of discharge, requires maintenance |
| Tubular Solar Battery | โน12,000 – โน18,000 | Ideal for deep discharge, reliable for solar backup, and longer than flat plate batteries | Bulkier, lower energy density, still requires maintenance |
| Lithium-Ion Battery | โน20,000 – โน30,000 | Higher efficiency, increased lifecycle, small size, charges quickly, requires less maintenance | Higher upfront cost compared to a lead-acid battery |
| Lithium Iron Phosphate (LFP) | โน22,000 – โน32,000 | Offers 4000 to 6000 cycles, 80 to 90% usable capacity, no maintenance, safer chemistry | Higher initial cost, limited availability in some markets |
2. Battery Capacity and Size
Battery size, measured in kWh, also influences the prices of the battery. Usually, larger batteries have a lower cost per kWh because certain components have fixed prices regardless of the battery capacity.
For example, the cost of the battery management system (BMS), safety components, installation, and wiring increases even with the increase in battery size. As a result, when storage capacity increases, these fixed costs are distributed across more kilowatt-hours.
Hence, a 10kWh batter may offer a lower price per kWh than a 3kWh batter, even though the total upfront investment is higher.
3. Cycle Life and Battery Lifespan
The other aspect that determines the cost of the battery is the life cycle of the battery. The cycle is the number of times the battery can be charged and discharged before its efficiency decreases.
Lead-acid batteries have an average capacity of between 1,000 and 1,500 charge cycles, meaning that they need replacement after a few years of normal operation. However, lithium batteries can offer 4,000-6,000 cycles or more, which lets the battery last a long time.
Even though the batteries with longer lifespan are more expensive and their initial costs are very expensive, they will be better in the long run. They also need fewer replacements.
4. Depth of Discharge (DoD)
Not all the battery’s stored energy can be used without affecting its lifespan. The Depth of Discharge refers to the percentage of energy stored that can be utilised.
For example, if a battery has a 10 kWh capacity with 80% depth of discharge, then only 8 kWh is stable and can be completely used. Higher depth of discharge allows you to use the more amount of energy without damaging the system.
Lithium batteries generally have a higher depth of discharge as compared to lead-acid batteries. Hence, they have a higher kWh price, but they use more energy and improve overall value.
How Should one Calculate the Right Battery Size While Minimizing Cost?
The following steps should be followed by the buyers before purchasing a battery because they will enable them to make the correct decision on the battery size without spending excessively:
- Determine your critical load:Write down a list of things you need when there is an outage or at night. Sum the wattage and multiply by hours of use. This gives you the evening kWh needed.
- Take into account the depth of discharge: Take your needs and divide them by the DoD of the battery. Assuming that you require 4 kWh and your battery has an 80 percent DoD, the battery you will require is 5 kWh.
- Give one 20-percent buffer against ramifications: Batteries become less effective with age. A 5 kWh battery can only produce 4 kWh in three to four years of operation.
- Compare price per useful kWh: A 10 kWh lead-acid battery with 50% DoD is only able to give 5 useful kWh, and the effective price per usable kWh is twice the stated price.
Conclusion
It is important to know how solar battery capacity and price per kWh are related to make a good choice in solar investment. Although bigger batteries are usually less expensive on a kWh basis, the choice of the battery is not as simple as obtaining the biggest or the lowest cost one. The best battery size depends on the electricity consumption of your home, the backup, solar panel size, and future energy objectives.
The battery chemistry, cycle life, usable capacity, warranty, and system compatibility are some of the factors that should be considered when making total value decisions. To a large number of Indian homeowners, the Indian batteries, which are made out of lithium, might prove to be costly in the short run but will be more efficient, have a higher lifetime, and need less maintenance in comparison to the traditional lead-acid-based batteries.
With more solar applications and the development of battery technology, storage systems are getting more efficient and available. The comparison of price per kWh and performance and durability would allow buyers to construct a solar system that offers a stable backup power system, the best energy conservation, and enhanced energy independence in the years to come.
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