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Solar Batteries And How They Work

Importance of solar batteries:

As we are well aware of the fact that solar energy isn’t available at night. Thus, solar batteries are the devices used to store the solar energy generated by the solar panels for later use. These solar batteries are used to power the appliances when the solar panels don’t generate electricity, like on nights, cloudy days, or during power outages.

The main agenda of using solar batteries is to use the electricity that is produced by the solar panels as when the batteries are not used, all the excess electricity will be transferred to the grid and used by other people without taking full advantage of this energy by yourself.

Workings of solar batteries:

Long story short, solar batteries storage works by storing the excess energy produced by photovoltaic cells. With the low rates in export tariffs, the batteries prove to be more beneficial for long-term investment. Moreover, the second benefit of using the battery is that it saves people from power outages and prevents dependence on mere grid supply.

  • The sunlight is converted into DC by the solar panels.

  • Then the converter converts the energy into AC energy used by the appliances then.

  • Then the remaining surplus power is then sent toward batteries to charge them.

  • After the batteries are set, the remaining energy is sent to the grid for regular utilization.

  • Then at night, the electricity stored in the batteries is used and thus, proves minimal dependence on the grid.

The technology of battery storage:

We have discussed the general working principle of battery working in the above section, but this technology also has variations. There are two popular types of battery storage lithium-ion and lead-acid. Generally, lithium batteries are more preferred by solar panel companies as they are more reliable, stores energy for a more extended period, and have more depth of discharge. Depth of release is a battery’s ability to which it can be used.  

  • Lithium-ion batteries:

This battery has a higher depth of discharge, longer lifespan, holds energy for a more extended period, and contains a more compact and preferable size. However, this battery also costs more than the other one due to these characteristics.

  • Lead-acid battery:

For years, lead batteries have been used as a non-grid option. After introducing new technologies, this battery is still being used at very pocket-friendly prices. However, their popularity fades due to the low depth of discharge and shorter life span.

                                           

Benefits of solar batteries:

The battery is an excellent backup for the solar panels, ensuring that you get the best energy from your solar power system. So some of the benefits of solar batteries are as follows:

Stores excessive energy:

On sunny days when there is no one at home or when there is more power than you need, it is evident that this excess energy will be transferred to the grid. However, it is beneficial if you join a net metering program, it can aid you to earn some money, but still, it is not going to be 1:1 of the energy you produce. Thus, these storing batteries can help you store the extra energy for your later use and reduce your reliance on the grid.

Facing power outages:

At the time of power outages, these storing batteries aid you in facing the situation. It saved enough energy that you are not dependent on the grid alone but can power your appliances every time.

Reducing carbon footprint:

The grid usually produces energy through fossil fuels that release carbon particles into the environment. Thus, this energy is generally known as dirty energy. Therefore, when your solar panels don’t produce enough energy, you will automatically use harmful grid energy.

Power at night:

It is known that the solar panels didn’t produce energy at night; thus, when the sun goes down, one has to rely on the grid. By having solar batteries, you can store energy in the daytime and then use it at night. This will give you grid independence and keep your electricity bill low.

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The solution as a backup power:

The noisy gas-power backup can be a hassle; thus, when one uses these solar batteries, you will be free from such situations.

After reading about the importance of solar batteries, everyone understands that batteries are must to have with the solar system. Still, one may wonder how to buy a perfect storm or the criteria to buy the best one. Then let me suggest to you some of the critical factors that one must consider while purchasing any battery.

  • Capacity and power are some of the most important factors while buying any battery for your solar system. A battery’s ability to store energy is noted in kilowatts hours. In contrast, the battery’s amount of electricity or power is what it can deliver at a time can be measured in kilowatt. Let’s assume two scenarios, a battery with high capacity and low power can supply energy to multiple appliances for a more extended period. In contrast, a battery with low capacity and high power can provide energy to your whole home for a minimal period.

  • Battery life is also an important thing to take into consideration. As we know, lifespan decreases with time, so one must know how long will the battery work. It is calculated in several cycles or years.

These two are the scenarios that everyone must keep in consideration. You can stack multiple Solar batteries for your desired wattage depending on what you plan to use the stored energy for. However, there are some best solar batteries from trusted sources that can be considered for their solar power.    

Tesla powerwall-2

Enphase encharge

Generac

PWrCell

LG chem

RESU 10H

BYD

Battery-Box HV

Capacity

13.5 kW

3.4-5.4 kW

9-18kW

9.3kW

5.1-12.8 kW

Power

5.8 kW

3.84 kW

3.4-6.7 kW

5kW

5.1-12.8kW

DoD

100%

100%

84%

95%

100%

Price

$10,000

$5000-10,000

$9,000

$7,000

$4,000

But in this great saturation sometimes it become confusing that how much batteries are required for a particular solar panel. So let’s just give an estimation of it:

solar panel power

Output that is produced

Required power of batteries.

3kw

4kw

5kW

6kW

10kw

30kW

100kW

12kwh

16kWh

20kWh

24kWh

40kWh

120kWh

400kwh

8.4kwh

11.2kWh

14kWh

16.6kWh

28kWh

84kWh

280kWh

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