As more UK homeowners and businesses adopt solar energy, the question of how long solar batteries last is one of the things we’re asked.
At Fit Solar, we specialise in installing solar panels and battery systems to help you get the most out of your renewable energy.
But how long can you expect a solar battery to last, and what factors impact its lifespan?
In this blog post, we’ll explore these questions to help you make informed decisions about your solar battery investment.
Average Lifespan of Solar Batteries
The lifespan of a solar battery typically ranges from 5 to 15 years, depending on the type and how well it is maintained.
While that might sound short, at Fit Solar, we install high-quality batteries that come with a 12-year warranty - so you have added peace of mind.
This warranty reflects the confidence we have in our products and ensures that your system will continue to perform reliably for over a decade.
Different Battery Chemistries Have Varying Lifespans
Lead-Acid Batteries: These are the most affordable but generally have the shortest lifespan, usually around 5 to 7 years.
They require more maintenance, such as regular topping up of electrolyte levels, to ensure their longevity.
Lithium-Ion Batteries: These are more expensive but offer a much longer lifespan, typically lasting 10 to 15 years.
Lithium-ion batteries are more efficient, require less maintenance, and are the preferred choice for most modern solar installations.
Fit Solar’s lithium-ion batteries are backed by our 12-year warranty, giving you the confidence that your investment is protected.
Flow Batteries: Flow batteries are relatively new to the market but have the potential to last up to 20 years.
However, they are less common and often more expensive than lithium-ion batteries.
Factors That Affect Solar Battery Lifespan
While the average lifespan of a solar battery can give you a rough idea of how long it will last, several factors can influence its actual longevity.
Depth of Discharge (DoD)
This refers to how much of the battery’s capacity is used before recharging.
The deeper the discharge, the more wear it puts on the battery.
For example, a lithium-ion battery with a 90% DoD will last longer if it’s regularly discharged to only 80% rather than using the full 90% regularly.
Most modern batteries come with recommendations for an optimal DoD to maximise lifespan.
Cycles
A battery’s lifespan is often measured in charge-discharge cycles. The more cycles a battery goes through, the shorter its lifespan.
Lithium-ion batteries typically have a cycle life of 5,000 to 10,000 cycles, meaning they can last many years even with daily use.
Temperature
Batteries perform best in moderate climates. Extreme cold or heat can degrade their performance and shorten their lifespan.
In the UK, proper installation in temperature-controlled environments can help avoid these issues.
Maintenance
Regular maintenance is crucial for ensuring that your solar battery lasts as long as possible.
For example, lead-acid batteries require regular checks and water top-ups, whereas lithium-ion batteries are much more low-maintenance but still benefit from occasional inspections to ensure they are running efficiently.
Charging Speed
Fast charging may seem convenient, but it can wear out a battery more quickly. Slow, steady charging ensures a longer lifespan.
Free guide
There is a wealth of excellent information available online regarding solar energy; however, there is also plenty of misleading content out there.
With that in mind, we've created this handy guide for you to download for FREE. We hope it provides you with a clear overview of what solar PV and battery storage are, how they work, and how they can benefit you.
How to Extend the Lifespan of Your Solar Battery
At Fit Solar, we believe in helping you maximise your investment. Here are a few tips to extend the lifespan of your solar battery system:
Monitor Energy Use: Avoid fully discharging the battery every day. Instead, aim for partial discharges, which can extend its lifespan.
Install in the Right Location: Ensure your solar battery is installed in a temperature-stable environment, such as a garage or utility room, to prevent overheating or freezing.
Use a Battery Management System (BMS): A BMS can help optimise your battery’s performance by regulating charging and discharging patterns and protecting it from overcharging or deep discharges.
Routine Maintenance: Even low-maintenance batteries benefit from periodic checks. Ensure that your battery system is running efficiently and that no software updates or repairs are needed.
When to Replace a Solar Battery
Knowing when to replace a solar battery is just as important as understanding how long it should last.
Some key signs to watch for include:
Reduced capacity: If your battery holds less energy than it used to, this may be a sign of age.
Increased charging time: Batteries that take longer to charge are likely nearing the end of their lifecycle.
Frequent malfunctions or errors: As batteries degrade, they may trigger warning messages or malfunction more frequently.
If you notice any of these signs, it may be time to consult with a professional to assess the condition of your solar battery and consider a replacement.
At Fit Solar, we provide expert assessments to help you determine the best course of action.
Conclusion
The lifespan of a solar battery depends on various factors, including the type of battery, how it’s used, and how well it’s maintained.
By choosing high-quality batteries, monitoring energy use, and providing routine care, you can ensure that your solar battery lasts as long as possible—often 10 years or more.
At Fit Solar, our batteries come with a 12-year warranty, giving you peace of mind that your system will be protected for years to come.
If you're interested in installing a solar panel and battery system or want advice on extending the lifespan of your current setup, get in touch with Fit Solar today.