Solar panels are a brilliant way to generate clean electricity at home and reduce your energy bills. But if you want to take full control of your energy usage and get the most benefit from your system, adding a battery can make a real difference.
Battery storage allows you to make the most of the electricity your solar panels generate — even after the sun goes down. In this guide, we’ll explain how battery storage works, explore the benefits for households, and help you decide if it’s right for your home.
How Does a Battery Work in a Solar PV System?
Solar panels produce electricity whenever the sun is shining, typically between mid-morning and late afternoon. But what happens if you’re not using much electricity during that time? Without a battery, any excess energy is sent back to the grid — which helps others, but means you’ll still be buying electricity in the evening when your solar system isn’t generating.
A solar battery stores this unused electricity so that it’s available when you need it most — such as after sunset, early in the morning, or during peak usage periods. According to the Energy Saving Trust, this can significantly increase the amount of solar energy you actually use in your home.
Think of the battery as your personal energy reservoir — storing clean electricity for use when it suits you.
What Are the Benefits of Adding a Battery?
Adding a battery to your solar PV system provides a range of advantages that go beyond just cost savings.
1. Maximise Self-Consumption
By storing your own electricity, you reduce the need to import energy from the grid — especially during evenings when usage is typically highest. This makes your home more self-sufficient and can reduce your reliance on suppliers, which is particularly useful during periods of rising energy prices.
2. Reduce Your Energy Bills
Although the upfront cost of a battery is an investment, it can lead to long-term savings. Instead of exporting excess solar generation for a small payment (via the Smart Export Guarantee), you can use more of that electricity yourself — avoiding higher import costs. In many cases, homeowners with solar and battery systems see a meaningful drop in their electricity bills over time.
3. Gain Energy Independence
Battery storage gives you more control over your energy. You’re less reliant on external suppliers and more resilient during power cuts (depending on the system and setup). Some systems can provide backup power to essential circuits, offering peace of mind during outages.
4. Benefit from Smart Tariffs
Some energy suppliers offer flexible or time-of-use tariffs, where electricity is cheaper at night and more expensive during peak times. With the right battery and inverter setup, you can charge your battery when grid prices are low and use the stored energy when prices are high — even if you don’t have solar panels.
5. Power Your EV or Heat Pump Efficiently
As more households switch to electric vehicles and low-carbon heating systems, battery storage can play a key role. Storing solar energy and using it to power your car or heat pump makes your system more efficient and lowers running costs. It also helps reduce the load on the grid during peak hours.
Batteries Without Solar Panels: Charge at Off-Peak Times
Did you know that you don’t need solar panels to take advantage of battery storage? Even without a solar PV system, you can install a battery that stores energy from the grid during off-peak hours, when electricity is cheaper. This is ideal for homes with high energy usage during the day, or for those who want to make the most of discounted energy prices.
By charging your battery when electricity prices are low — typically during the night — you can store cheap electricity and use it during the day, avoiding the higher costs of peak-rate energy. This “force charging” method provides a cost-effective way to save money, even if you don’t generate your own power from solar. It’s an efficient way to gain more control over your energy costs, especially in an era of fluctuating energy prices.
Is Battery Storage Right for Your Home?
While battery storage offers many benefits, it’s not a one-size-fits-all solution. The best approach is to assess your energy use, the size of your solar PV system, and your lifestyle.
Battery storage is especially suitable for households that:
- Are often out during the day when solar generation is highest
- Use most of their electricity in the early mornings or evenings
- Want to reduce their dependence on the grid
- Already own or are planning to install an EV or heat pump
- Are looking for long-term energy security and lower bills
At Green Sky Renewables, we design every system based on your energy profile. We look at your consumption patterns, your future needs, and the physical space available to ensure the battery system is the right size and spec for your property.
What Does Battery Storage Cost?
The cost of a solar battery depends on capacity (measured in kilowatt-hours or kWh), brand, and installation requirements. Typically, batteries for residential use range from £2,000 to £6,000, depending on size and functionality.
While a battery system doesn’t qualify for the 0% VAT rate on solar panels unless installed together as a single system, the government has extended this zero VAT offer for home battery installations from February 2024, which makes now a great time to consider adding one.
We always provide clear, itemised proposals with full payback projections, so you can make an informed decision.
How Do I Know It’s Working?
All our battery systems come with user-friendly monitoring apps that allow you to view live data about your energy usage, solar generation, battery charge levels, and overall system performance.
But it’s not just up to you to keep an eye on things — we stay connected with your system remotely, meaning we can provide ongoing support, troubleshoot issues, and help you optimise performance even after installation. Our customer support doesn’t stop when the panels go up — we’re here for the long haul.
Can a Battery Be Added Later?
Yes — many of our customers choose to add a battery to their solar system later, once they’ve had time to understand their energy usage. If you already have panels, we can assess your existing setup and recommend the most compatible battery options.
In some cases, planning by choosing a hybrid inverter at the time of your solar installation can make battery integration easier and more cost-effective in the future.
Why Choose Green Sky Renewables?
At Green Sky Renewables, we’re not just installers — we’re energy partners. We take the time to understand how you use electricity and design systems that fit your lifestyle, your budget, and your property. From the first survey to installation and post-install care, we’re with you every step of the way.
We don’t just walk away after the job is done. Our clients benefit from dedicated aftercare, remote system checks, and expert advice — whenever you need it. Whether you have questions six days or six years after install, you can count on us.
Book Your Free Solar & Battery Proposal
If you’re ready to take control of your energy use and unlock the full potential of your solar system, we’re here to help.
Get in touch with Green Sky Renewables today to arrange a free home survey and receive a detailed, personalised proposal. We’ll help you understand what’s possible, what’s worthwhile, and what will deliver the greatest benefit for your home.