Should I add a battery to my solar panels?
Yes, a battery is strongly recommended for most Scottish homes. Without a battery, you export surplus daytime generation to the grid and buy it back in the evening. With a battery, you store and use your own electricity in the evening and overnight, which is exactly when Scottish homes use most energy. Interest-free credit up to £30,000 covers the full system, subject to status.
Reviewed by the Scottish Energy Efficiency team · Last updated: 30 October 2026
Key facts
- A battery lets you use your daytime generation in the evening and overnight.
- A battery is strongly recommended for most Scottish homes.
- Interest-free credit up to £30,000, subject to status.
- 0% VAT on solar and batteries until 31 March 2027.
- The survey recommends a battery size based on your usage.
Last updated: 30 October 2026
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In detail
Adding a battery to your solar panels is one of the most common questions Scottish homeowners ask. This page explains why a battery matters, what it costs, and how to decide.
What does a battery do?
A battery stores the electricity your solar panels generate during the day so you can use it in the evening and overnight. Without a battery, the surplus electricity you generate during the day is exported to the grid, and you buy electricity back from your supplier in the evening at their rate. With a battery, you store that surplus and use it yourself, which means you buy less from the grid. A battery also provides resilience — some systems can provide backup during power interruptions, depending on the inverter and setup.
Why is a battery important in Scotland?
Scottish homes use most of their electricity in the evening and overnight — lighting, cooking, heating and appliances. But solar panels generate during the day. Without a battery, there is a mismatch between when you generate and when you use. A battery bridges that gap, storing daytime generation for evening use. This is particularly valuable in Scotland because of the contrast between long summer days and short winter days. In summer, you generate lots of electricity but may not be home to use it. In winter, you generate less but need more in the long evenings. A battery helps in both seasons.
How much does a battery add to the cost?
Battery cost depends on capacity and brand. A larger battery costs more but stores more electricity. The survey recommends a battery size based on your household usage and roof, and the quote shows the total cost of the system with the recommended battery included. Interest-free credit up to £30,000 is available for the full system — panels and battery — subject to status. We do not publish battery prices separately because the cost depends on the system as a whole.
What size battery do I need?
The survey recommends a battery size based on your household usage pattern and how much you want to store. A typical Scottish home benefits from a 5–10kWh battery, but the right size depends on your consumption. If you use most of your electricity in the evening, a larger battery lets you run your home on stored solar for longer. If you are home during the day, you use more of your generation directly and may need a smaller battery. The survey looks at your energy bills and usage pattern to size the system correctly.
Can I add a battery later?
Yes, you can add a battery after installing solar panels, but it is usually more cost-effective to install panels and battery together in one job. A separate battery installation means a second site visit, additional electrical work, and potentially a different inverter. Installing together avoids these costs and means the system is designed as a whole from the start. The survey can discuss both options — panels only now with a battery later, or the full system in one go.
Does a battery provide backup during power cuts?
Some battery systems can provide backup during power interruptions, depending on the inverter and how the system is set up. Not all battery systems have this capability — it depends on whether the inverter supports islanding, which lets the battery power your home independently of the grid. If backup is important to you, mention it during the survey and the surveyor can recommend a system that supports it. For rural properties where power interruptions are more common, this can be particularly valuable.
How do I decide?
The best way to decide is to arrange a no-obligation survey. The surveyor assesses your roof, usage and electrical setup, and we provide a quote showing the system with and without a battery so you can compare. You can see the cost difference and decide whether a battery is right for you. See our is solar worth it in Scotland page for more on why a battery matters, or our costs guide for pricing.
More questions?
See our FAQs, costs guide, or how it works page. For in-depth Q&A, visit the Scottish Energy Efficiency questions hub.
Related guides
Keep reading about pay monthly solar in Scotland.
Frequently asked questions
Straight answers about pay monthly solar panels and batteries in Scotland.
Do I need a battery with solar panels?
A battery is strongly recommended for most Scottish homes. Without a battery, you export surplus daytime generation to the grid and buy it back in the evening. With a battery, you store and use your own electricity.
How much does a battery add to the cost?
Battery cost depends on capacity and brand. The survey recommends a battery size based on your usage, and the quote shows the total cost with and without a battery so you can compare. Interest-free credit up to £30,000 covers the full system.
What size battery do I need?
The survey recommends a battery size based on your household usage and roof. A typical Scottish home benefits from a 5–10kWh battery, but the right size depends on your consumption pattern and how much you want to store.
Can I add a battery later?
Yes, you can add a battery later, but it is usually more cost-effective to install panels and battery together in one job, avoiding a second site visit and additional electrical work. The survey can discuss both options.
Does a battery provide backup during power cuts?
Some battery systems can provide backup during power interruptions, depending on the inverter and setup. The survey can discuss whether backup capability is important for your home.
Reviewed by the Scottish Energy Efficiency team · Last updated: 30 October 2026