When purchasing solar battery storage, there are several key factors you need to consider. These factors include the battery type, size, and overall cost.

Not sure how to navigate the world of solar battery storage? Don't worry! This guide will help you choose the best one for your needs.

We will outline these factors and share some tips for finding the best solar battery storage for your needs.

How do Solar PV Systems Work?

Have you ever seen solar panels on the roofs of houses? Do you know how these solar panels generate electricity?

The working principle of a solar PV system is very simple and can be summarized in four steps:

  1. Sunlight hits the solar panels, and the solar cells in the panels absorb the energy and generate direct current (DC) electricity.
  2. The wiring and circuitry connected to the solar panels collect the DC electricity and convert it into alternating current (AC) electricity through an inverter.
  3. The AC electricity is then transferred to your home's existing fuse box, where the energy is distributed throughout the home to power all of your devices.
  4. (Optional) Additionally, any electricity that is not used to power your home can usually be sent to the grid (operated by the utility company) or stored in batteries for backup power.

The overall process of a solar photovoltaic system is quite simple and can be summarized in four steps. Solar panels use technology to convert sunlight into energy, while the many components of a solar photovoltaic system do the rest. Learn more about each component in our next blog post.

It is worth noting that using solar energy does not mean you are left in the dark by the utility company. You can still get some electricity from the grid to supplement your energy consumption at night or on rainy days, as solar cells do not have the sunlight they need to generate electricity. Therefore, you can use your electricity happily knowing that you are saving money and making a positive impact on the environment.

solar PV system work

What to Consider When Buying Solar Batteries

Solar batteries, a way to store solar energy for use on cloudy days or at night, are becoming increasingly popular. There are a variety of solar batteries on the market, each with its own features and benefits. To choose the best solar battery for your needs, you need to consider the following factors:

Battery Type: There are two main types of solar battery storage: lead-acid batteries and lithium-ion batteries. Lead-acid batteries are typically cheaper, but they are also heavier, less efficient, and have a shorter lifespan. Lithium-ion batteries are more expensive, but they are also lighter, more efficient, and have a longer lifespan.

  • Battery Size: The size of battery you need will depend on your energy usage and solar panel system. If you have a large solar panel system that generates a lot of excess energy, you will need a larger battery to store that energy. Conversely, if you have a smaller solar panel system or use a lot of energy, you may be able to get away with a smaller battery. To determine the size of battery you need, you will need to calculate your daily energy usage and the daily energy production of your solar panel system.

    Cost: The cost of solar battery storage will vary depending on the size and type of battery you choose. In general, larger batteries and lithium-ion batteries will be more expensive than smaller batteries and lead-acid batteries. Be sure to compare prices from multiple vendors to find the best deal.

  • Brand: It is important to choose a reputable brand when purchasing solar battery storage. Look for a company with a good track record and positive customer reviews. A reputable brand is more likely to offer a high-quality product and good customer support. For example, AlphaESS's smile bat 15 kwh solar lithium battery wall-mounted device and Batterlution's new balcony solar battery system, MicroBat.

  • Warranty: Be sure to check the warranty offered by the manufacturer. A longer warranty will give you peace of mind and may be worth the extra cost.

    Depth of Discharge (DoD): Depth of discharge refers to the amount of energy that can be used from the battery before it needs to be recharged. A battery with a high DoD will be more efficient and have a longer lifespan.

    Lifespan: The lifespan of a solar battery depends on the type and size of the battery and how it is used. Be sure to choose a battery with a long lifespan to ensure you get the most value for your money.

    Installation: Some solar battery storage systems are easier to install than others. If you are not comfortable installing the system yourself, you may need to choose a system that comes with installation or is easy to install yourself.

How much does a 15kWh lithium battery cost per kWh?

Kilowatt-hour (kWh) is a unit of energy that helps us understand how much electricity an appliance consumes.

For example, if a light bulb consumes 60 watts of power for one hour, it has consumed 0.06 kilowatt-hours (kWh) of electricity.

Generally, household items such as lights, refrigerators, freezers, and other small appliances consume relatively little energy.

However, large appliances like air conditioners (4 kW) and electric dryers (3.5 kW) require several kilowatts to operate. Therefore, these large appliances will use multiple kilowatt-hours per hour.

A solar battery system can convert solar energy into electricity and store it in batteries. The capacity of the battery determines how many kilowatt-hours of energy it can store.

The cost of a solar battery system largely depends on how many kilowatt-hours of energy it can store. In general, the larger the capacity, the higher the cost.

Currently, the average installed cost of solar batteries ranges from \$1,100 to \$1,500 per kilowatt-hour. This cost is expected to continue to decline as technology advances and economies of scale take effect.

Tesla powerwall

Tesla Solar Battery Cost

The Tesla Powerwall 2 is one of the most popular solar batteries on the market, due in large part to the name recognition of the Tesla brand and the influence of Elon Musk.

The Powerwall 2 battery typically takes 6 months to a year to install, which is likely due to its popularity and supply chain issues.

While some industry experts believe that batteries from brands like Generac and Enphase are slightly better in quality, the Powerwall 2 still has many advantages, including:

Sleek design and ease of use and strong brand support and community.

Scalability, allowing you to add more batteries as needed. The price of the Tesla Powerwall 2 is in the middle of the pack compared to other battery products on the market.

Here are some pricing examples for the Powerwall 2:

Single battery (13.5 kWh capacity): $15,500

Two batteries (27 kWh capacity): $22,500

Generac Solar Battery Cost

Generac solar batteries are well-respected in the industry for their high quality, reliability, and durability.

While Generac batteries cost slightly more than the market average, their superior performance and customer service make them a worthwhile investment.

A Generac PWRCell system includes an inverter, a battery storage enclosure, and at least three lithium-ion battery modules.

Here are some examples of the solar battery storage costs for Generac PWRCell systems:

Generac PWRcell M3 battery (9 kWh capacity): $14,300

Generac PWRcell M4 battery (12 kWh capacity): $17,300

Generac PWRcell M5 battery (15 kWh capacity): $20,300

Generac PWRcell M3 battery
Enphase Solar Battery

Enphase Solar Battery Cost

Enphase solar batteries are known for their high value and flexible configuration.

Compared to other brands, Enphase batteries are typically lower in cost while still offering reliable performance and an excellent warranty.

Enphase offers two different capacity IQ batteries:

Enphase IQ Battery 3 (3.36 kWh capacity): $7,000

Enphase IQ Battery 10 (10.08 kWh capacity): $12,000

AlphaESS Smile Bat Solar Battery Cost

AlphaESS Smile Bat solar batteries are typically less expensive than other brands. Below you will see the costs of AlphaESS Smile Bat 10kWh and 15kWh lithium iron phosphate batteries:

Alpha Alpha ESS SMILE5-BAT-10.1P (10kWh): USD 4,473

Alpha ETS-15KWh-153VDC-100Ah-battery-ESS (15kWh): USD 7,590

AlphaESS Smile Bat Solar Battery

Batterlution Balcony Solar Battery Storage System Cost

Batterlution balcony solar battery storage systems are known for their high value and flexible configuration. Compared to other brands, Batterlution batteries are typically lower in cost while still offering reliable performance and an excellent warranty.

Batterlution offers two different capacity LiFePO4 batteries:

Batterlution MicroBat 2.5 kWh: Price range is $550-880, suitable for small homes or powering specific devices.

Batterlution MicroBat 5 kWh: Price range is $650-1000, with a larger capacity to meet larger energy needs.

Conclusion: Choosing the Right Solar Battery Storage for You

With the increasing popularity of solar energy, solar battery storage has become an important consideration for homeowners looking to maximize their energy independence and resilience. This guide has explored the key factors to consider when choosing a solar battery storage system, including battery type, size, cost, brand, warranty, depth of discharge, lifespan, and installation ease.

We've also highlighted the costs and features of popular battery systems from Tesla, Generac, Enphase, AlphaESS, and Batterlution, providing a starting point for your comparison. Remember, the "best" solar battery storage system for you will depend on your specific needs and budget.

Contact us