Should you add battery storage to your farm solar system?
For most Scottish farms, yes. Battery storage typically increases the share of solar electricity you use from 30% to 80%+, meaning less grid import and lower bills. It is especially valuable for dairies, cold stores and livestock ventilation with continuous loads. Battery storage also qualifies for 0% VAT until 31 March 2027.
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What does a solar battery do on a farm?
A solar battery stores excess electricity generated by your panels during the day so you can use it in the evening, overnight, or during periods of low generation. Without a battery, any electricity you do not use during daylight hours is exported to the grid. With a battery, you keep that electricity and use it yourself.
For farms, this is particularly valuable because many agricultural operations have continuous or overnight loads. A dairy farm running milking equipment at 5am and 5pm, a cold store running refrigeration 24/7, or a livestock building with overnight ventilation all benefit from having stored solar electricity available when the panels are not generating.
How much more self-sufficient does a battery make you?
A typical farm solar system without battery storage uses about 30–40% of its generation on-site — the rest is exported. Adding battery storage increases on-site usage to 70–85% or more, depending on battery capacity and your consumption pattern. This means you buy significantly less electricity from the grid.
The exact improvement depends on your load profile. Farms with high overnight demand see the biggest benefit. Your survey includes an assessment of how much a battery would improve your self-sufficiency based on your actual usage data.
How much does battery storage cost?
Battery storage typically adds £4,000 to £12,000 to your system cost, depending on capacity. Common farm battery sizes range from 5 kWh to 20 kWh. Larger batteries allow you to store more surplus generation. Like solar panels, batteries currently qualify for 0% VAT until 31 March 2027.
With interest-free credit up to £30,000 (subject to status), you can finance the battery alongside your panels. See our finance guide for more.
What types of batteries are available?
Lithium-ion batteries are the standard for farm solar installations. They offer high efficiency, long cycle life (typically 6,000+ cycles) and compact size. Your survey includes recommendations on battery type and capacity based on your consumption pattern and system size.
Battery systems are typically AC-coupled or DC-coupled. The right choice depends on whether you are installing a battery at the same time as panels or adding one to an existing system. Your survey covers this in detail.
How long do farm solar batteries last?
Lithium-ion solar batteries typically last 10–15 years depending on usage cycles and depth of discharge. Most carry a warranty of 10 years or a specified number of cycles. After this period, the battery may still function but with reduced capacity. Your quote includes warranty details for the specific battery recommended.
For more on battery storage in Scotland, visit our sister site Solar Battery Aberdeen.
For more questions and answers, visit the Scottish Energy Efficiency questions page.
Frequently asked questions
Can I add a battery later if I don't get one now?
Yes, in most cases. You can add a battery to an existing solar system, though it may require an AC-coupled battery system rather than DC-coupled. Installing both together is usually cheaper, but adding later is possible. Your survey covers both options.
What size battery does my farm need?
Battery size depends on your evening and overnight electricity consumption. A farm using 20 kWh overnight would need a 15–20 kWh battery. Your survey includes a load assessment to recommend the right capacity for your operation.
Can I export stored battery electricity to the grid?
Some battery systems support export, but the financial benefit depends on your export tariff. Most farms benefit more from using stored electricity on-site rather than exporting it. Your survey covers the economics of export for your situation.
Do batteries need maintenance?
Lithium-ion solar batteries are essentially maintenance-free. They are managed by the inverter system automatically. No regular servicing is required. Your quote includes any monitoring system that tracks battery health and performance.
Are batteries safe in farm buildings?
Yes. Modern lithium-ion solar batteries are designed for safe installation in a range of environments. They include battery management systems that monitor temperature and cell health. Your survey assesses the appropriate installation location in your farm building.
Last updated: 30 October 2026. Reviewed by the Scot Energy Efficiency team.