The Ultimate Guide to Solar Batteries
Reducing reliance on an electrical company and going green are two of the biggest benefits of opting for solar panels, but they also require extensive planning. To get the most out of your solar system, you want solar batteries. These batteries can store excess energy for future usage, helping you continue to use green energy even at night or when it’s too cloudy for your panels to operate effectively.
However, installing solar batteries is a big investment, especially after already having a solar panel system installed. Several considerations must be made to ensure the most return.
Not sure where to start? Our experts at Photon Brothers are ready to help. This is the ultimate guide to solar batteries, covering frequently asked questions about solar batteries such as:
- What are solar batteries?
- Are solar batteries worth it?
- What’s the cost of solar batteries?
- How many solar batteries do I need?
- How long do solar batteries last?
After you finish reading, you’ll know the ins and outs of solar batteries so you can make an informed decision for your home and personal use case.
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What Are Solar Batteries?
Homes reliant on solar panels need a way to stockpile energy for use when the sun isn’t shining. Many opt to install solar batteries for exactly this purpose. If your solar system produces more energy during the day than you use, the excess can be stored in a solar battery for later use.
However, not all solar batteries are the same. There are different types of solar batteries, with the most common being:
- Lead-acid. These batteries are among the most affordable but have some limitations. Typically, they have a much shorter charging life, averaging 500 to 1,000 cycles, and they must be fully recharged after each use to avoid reducing their lifespan. They also shouldn’t be directly wired to your solar array.
- Lithium-ion. Lithium-ion batteries are by far the most common in residential solar systems. They’re also commonly used in electric vehicles, thanks to not needing as much maintenance. They tend to have longer lifespans and don’t require a lot of space. However, they’re also among the more expensive choices.
- Nickel-cadmium. Nickel-cadmium batteries aren’t used as frequently in residential solar systems, but they’re durable and can operate even at extreme temperatures. They’re most common in large-scale, commercial solar operations.
- Flow. Flow batteries use a water-based electrolyte liquid flowing between separate chambers. As they charge, they create chemical reactions that allow for energy storage. They’re considered emerging technology and allow for a 100% depth of discharge, meaning you can drain these batteries, but they’re very expensive in comparison to other options.
Are Solar Batteries Worth It?
Yes, it’s usually worth having solar batteries as part of your system. They’re essential if you have plans of going completely off-grid, but even if you aren’t, you can still reap significant benefits by investing in them, including:
- Net metering. Depending on where you live, you may be able to opt into net metering. Essentially, you sell your excess energy to your utility company to add back into the grid and receive credits in return.
- Reducing energy reliance. If you’re trying to reduce general energy usage, storing solar energy in a battery allows you to continue benefiting from your panels, even when the sun isn’t out.
- Access to electricity during power outages. If you still rely on the grid for some of your energy usage, having solar batteries can ensure that you still have electricity during a power outage.
- Environmental advantages. Using energy stored in solar batteries grants access to electricity without any harmful emissions or byproducts.
What’s the Cost of Solar Batteries?
It’s always a tough question when someone wants to know what solar batteries cost because there’s a rather wide cost range for installing solar batteries. On average, you can expect to spend between $6,000 to $23,000. The exact cost to complete your solar battery installation depends on factors such as:
- Manufacturer. Each manufacturer will have its own set rate for their batteries. However, you may find differences in quality between them. It’s a good idea to spend a bit more upfront for a more reliable battery.
- Battery type. While lead-acid batteries are the most economical, they tend to have shorter lifespans. Lithium-ion batteries are the most common but also more expensive.
- Battery capacity. Stronger batteries with higher capacities tend to be more expensive.
- Tax incentives and rebates. Many areas offer tax credits, incentives, and rebates to reduce the cost of solar battery installation. For example, the federal Residential Clean Energy Credit offers a 30% tax incentive for qualifying battery storage technology installation until 2032.
- Battery quantity. How many batteries you need to suit your needs will influence your bottom line.
- Battery storage. If you live somewhere with harsh weather conditions, you may need to keep your batteries stored somewhere sheltered from the elements. This can add to your overall battery installation cost.
- Labor costs. You also have to account for the labor costs involved in installing your new battery system. This price can vary depending on your location and the company you choose to do the installation.
The cost of installing solar batteries can be high, but it also tends to come with significant savings over time as you reduce your reliance on electricity from the grid. In some cases, you may even be able to go completely off-grid, eliminating your power bill entirely.
How Many Solar Batteries Do I Need?
There’s no singular answer to how many solar batteries you need. It depends a lot on the individual use case. However, these considerations can help you determine the right quantity:
- Reason for Installation. Do you want your battery as a backup for the occasional outage, or do you have plans to go off-grid? If you want full off-grid living, you need ample battery storage to ensure you always have access to electricity when you need it. However, if your goal is simply to reduce reliance on your electrical company, you can often install fewer batteries and still get the same effect.
- General energy use. If your home uses more energy than the average household, you may need more batteries. However, if you live alone or are environmentally conscious, you might be able to use fewer.
- Climate. Climate can also affect your battery’s performance. Living in areas with extreme climates results in more heating and cooling usage, and you may need to account for extra batteries due to inefficiency.
- Net Metering Rates. In areas with net metering regulations like NEM 3.0, where energy credits for sending excess power back to the grid have been significantly reduced, having a battery allows you to store excess solar energy for personal use. This reduces the loss of credits and makes your solar system more cost-effective by maximizing the energy you produce.
- Usable capacity of each battery. Your batteries have set usable capacities. Cheaper batteries usually have lower usable capacities, which can necessitate a higher number needed.
- Size of solar panel. Extra batteries don’t do much when you don’t have a large enough solar system to charge them. The size of your solar system will determine how many batteries you can realistically keep charged.
How Long Do Solar Batteries Last?
Solar batteries generally last between 3 and 25 years, depending on the type, but proper maintenance can help keep them functional for as long as possible.
Lead-acid batteries typically last between 3 and 7 years, while lithium ions will often provide 10 to 15.
Other batteries, like flow or nickel-cadmium, last longer but are often too expensive to implement effectively in a home system.
Completing regular maintenance on your batteries based on manufacturer recommendations often protects them in the long run. Some common tips include:
- Keep the battery somewhere cool and dry, protecting it from moisture and extreme temperatures.
- Cycle through your battery daily. Avoid keeping it fully charged without use, as this can reduce its lifespan — similar to leaving a phone or computer always plugged in.
- Add a solar charge controller and a low-voltage disconnect system to your batteries to prevent overcharging and deep discharging, both of which can reduce useful lifespan.
- Clean batteries as necessary to ensure the terminals don’t corrode and ensure all connections are tight.
If you’re unsure how to maintain your solar batteries or you think they aren’t performing as they should, it might be time to call in the professionals to inspect and service them.
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