Last reviewed September 2026. No battery prices are quoted here: there is no official UK price series for batteries, so they are priced from itemised quotes.
Capacity check: a battery can shift at most roughly its usable capacity per full cycle. A 60 kWh battery cycling fully once every day moves at most about 21,900 kWh a year before losses (60 × 365), and in practice much less, because in winter there is little daytime surplus to store.
A battery raises the share of a farm array's output used on site when the farm has an evening or early-morning load, meaning you use your own electricity instead of buying it back from the grid at those times.
On a typical dairy or poultry farm where the heaviest loads run at dawn (milking) and dusk (ventilation, lighting), battery storage is the difference between exporting surplus solar in the middle of the day and buying grid electricity at dawn and dusk, versus using your own stored generation for those loads.
Agricultural battery storage explained
Agricultural battery storage means installing a rechargeable battery — almost always lithium iron phosphate (LiFePO4) in 2026 — alongside a farm's solar PV system so surplus daytime generation is captured rather than exported cheaply, then discharged when the farm's load is highest. UK farms have a load profile that punishes solar-only systems: the heaviest demand (milking, ventilation, refrigeration, feed handling) clusters at dawn and dusk, exactly when the panels produce least. Pairing farm solar with battery storage narrows that gap, carrying surplus midday generation into the dawn and dusk peaks and, with automatic transfer switching, backing up the systems a livestock farm cannot afford to lose during an outage.
Battery sizing for typical farm types
| Farm type | Solar kW | Battery kWh |
|---|---|---|
| Dairy (200 head) | 50–80kW | 30–60kWh |
| Poultry (free-range) | 80–150kW | 50–100kWh |
| Arable (mixed) | 30–50kW | 15–30kWh |
| Pig (intensive) | 100–200kW | 60–120kWh |
| Glasshouse / horticulture | 200–500kW | 100–300kWh |
Indicative sizes only: the right size comes from your half-hourly meter data (see the sizing method below), and batteries are priced from itemised quotes.
On a glasshouse site a battery can carry midday surplus into the evening, but winter heat and night-time crop lighting are far beyond what solar can supply — see which greenhouse loads solar can carry.
Why LiFePO4 for farms
Lithium Iron Phosphate (LiFePO4) chemistry is the right pick for agricultural environments: it is more thermally stable than NMC, far less prone to thermal runaway, and generally lasts more charge cycles. Check the cycle life and retained capacity the manufacturer guarantees on each quote.
Critical-load backup for livestock farms
Configured with automatic transfer switching, the battery keeps milk cooling, ventilation fans, automated feeders and water pumps running through a grid outage until its stored energy runs out. Backup time is the battery's usable capacity divided by the load on the backed-up circuits, so work it out from your meter data rather than assuming it.
Grants, tax relief and export
Batteries bought by a farm business are plant, like solar panels, so most farm businesses can deduct the whole cost in year one through the £1 million Annual Investment Allowance (AIA); a partnership with a company as a member cannot claim it. No farm scheme in England, Wales, Scotland or Northern Ireland funds solar panels or batteries as of 3 November 2026 (Northern Ireland's 20% NISEP grant for business solar PV, which never listed batteries, has closed for its 2026/27 round): round 2 of England's Improving Farm Productivity grant, which listed solar batteries, has closed with no further round announced. Smart Export Guarantee export (Great Britain only; each licensed supplier sets its own rate) is unaffected: you continue to export when the battery is full.
Battery chemistries — what gets installed on UK farms
The UK farm battery market in 2026 is dominated by lithium-iron-phosphate (LiFePO4) chemistry. Examples you may see quoted:
- Tesla Powerwall 3 — 13.5 kWh modular. Integrated inverter.
- BYD Battery-Box Premium HVS / HVM — 5–22 kWh single, stackable. 10-year warranty.
- Pylontech US5000 / Force L2 — modules that rack-stack to larger capacities.
- SolaX Triple Power — modular.
- Sungrow SBR / SBH — modular battery stacks.
- BESS containers (>250 kWh) — purpose-built 20ft / 40ft shipping containers integrated with farm DC bus. For large multi-MW arrays or PPA-funded installations.
Capacity, warranty terms and price vary by model, so compare them line by line on each itemised quote.
Use cases by farm type
| Farm type | Why battery matters | Typical battery |
|---|---|---|
| Dairy | Twice-daily milking (5am + 3pm) brackets the solar peak. Battery shifts midday surplus to dawn/dusk milking loads. | 30–60 kWh |
| Free-range poultry | 24/7 ventilation, overnight automated feed mill loads. High self-consumption baseline, raised further by a battery. | 50–100 kWh |
| Arable | Grain drying peaks Aug-Oct, otherwise low baseline. Battery less critical — system sized for export instead. | 15–30 kWh (or none) |
| Pig (intensive) | Continuous climate control + feed handling 24/7. Battery shifts huge midday surplus to night loads. | 60–120 kWh |
| Soft fruit / packhouse | Pre-cooling and pack-house refrigeration runs night-time in some operations. | 80–200 kWh |
How to size a farm battery from half-hourly meter data
A sizing method, not a savings estimate: no savings or self-consumption figures are assumed here. Work it through with your own data.
- 1. Gather twelve months of half-hourly data. Take the farm's half-hourly consumption from its meter, and the array's expected half-hourly generation from the installer's desk feasibility.
- 2. Find each day's surplus and waiting load. The surplus is the solar generation the farm does not use as it is produced; the waiting load is the evening and early-morning demand the panels cannot cover directly (milking, cooling, ventilation, lighting).
- 3. The battery can only shift the smaller of the two, and never more than its usable capacity per full cycle. A battery bigger than the typical daily surplus, or than the load waiting for it, sits part-empty.
- 4. Remember the ceiling. A battery shifts power by hours, not seasons: each full cycle moves at most roughly its usable capacity (see the capacity check above), and in winter there is little daytime surplus to store.
- 5. Price the size the data supports from itemised quotes, then work out simple payback as the battery's cost divided by the value of the kWh it actually shifts each year.
If the job is pumping water, a header tank filled while the sun shines is often a simpler store than a battery — see solar water pumps for livestock and irrigation.
Farm battery storage costs (2026)
There is no official UK price series for batteries (the DESNZ solar cost statistics exclude them), so farm battery storage is priced from itemised installer quotes for the capacity your meter data supports. Ask for the battery, inverter, installation and any backup switching as separate lines. Batteries bought by a farm business are plant, so most farm businesses can deduct the whole cost in year one through the £1 million Annual Investment Allowance (a partnership with a company as a member cannot claim it); no grant for farm batteries is open.
Grid services revenue (commercial-scale only)
Larger farm batteries may be able to earn from flexibility or balancing services through an aggregator.
Farm battery storage — frequently asked questions
What is solar and battery storage for agriculture?
Solar and battery storage for agriculture pairs farm PV with a LiFePO4 battery so daytime generation is stored and used at evening and dawn load peaks. It raises the share of the array's output used on the farm when the farm has an evening or early-morning load, and it can add power-cut backup for milking and ventilation.
How does battery storage help farms?
Battery storage stores surplus midday solar and releases it at dawn milking and dusk ventilation peaks, so a farm uses its own generation instead of buying grid electricity at those times. Configured with automatic transfer switching, it can also back up critical livestock systems during grid outages, and it can shave expensive peak-demand charges.
How much does farm battery storage cost in the UK?
There is no official UK price series for batteries, so farm battery storage is priced from itemised installer quotes for the capacity your half-hourly meter data supports. Batteries bought by a farm business are plant: most farm businesses can deduct the whole cost in year one through the £1 million Annual Investment Allowance (a partnership with a company as a member cannot claim it).
What size battery does a farm need?
Size a farm battery at roughly 0.5-1x your daily solar surplus, matched to your half-hourly load profile. As a guide: 200-head dairy 30-60kWh, free-range poultry 50-100kWh, mixed arable 15-30kWh, intensive pig 60-120kWh, glasshouse or packhouse 100-300kWh. The right size comes from your actual smart-meter data, not a rule of thumb.
Is battery storage worth it for farms?
It depends on the farm's load profile and the itemised quote. A battery raises the share of solar output used on site when the farm has an evening or early-morning load (milking, ventilation, cooling) that the panels cannot cover directly. Arable farms with low evening demand often gain less and may be sized for export instead. Size it from your half-hourly meter data before comparing quotes.
What is the payback period for farm battery storage?
It depends entirely on the farm, so no typical figure is given here. Simple payback is the battery's itemised cost divided by the value of the kWh it shifts each year: the kWh moved times the gap between your import unit rate and the export rate you give up. A battery only earns when the farm has an evening or early-morning load to absorb stored solar, and it shifts power by hours, not seasons.
Can battery storage power a farm during a power cut?
Yes. Configured with automatic transfer switching, a farm battery keeps milk cooling, ventilation fans, automated feeders and water pumps running through a grid outage until its stored energy runs out. Backup time is the battery's usable capacity divided by the load on the backed-up circuits, so work it out from your meter data rather than assuming it.
Do farm batteries qualify for grants or the Annual Investment Allowance?
Batteries bought by a farm business are plant, like solar panels, so most farm businesses can deduct the whole cost in year one through the £1 million Annual Investment Allowance (AIA); a partnership with a company as a member cannot claim it. No farm scheme in England, Wales, Scotland or Northern Ireland funds solar panels or batteries as of 3 November 2026 (Northern Ireland's 20% NISEP grant for business solar PV, which never listed batteries, has closed for its 2026/27 round): round 2 of England's Improving Farm Productivity grant, which listed solar batteries alongside rooftop solar, has closed with no further round announced, and the Farming Equipment and Technology Fund's 2026 window closed on 12 May 2026.
How much can a battery save a dairy farm per year?
It depends on how many kWh the battery moves from midday surplus to milking and cooling loads, and on the gap between your import unit rate and the export rate you give up. The ceiling is set by capacity: a 60 kWh battery cycling fully once every day moves at most about 21,900 kWh a year before losses (60 × 365), and in practice much less, because in winter there is little daytime surplus to store. Twice-daily milking at dawn and dusk brackets the solar peak, which makes dairy an ideal battery candidate.
What battery is best for a farm — LiFePO4 or lithium NMC?
LiFePO4 (lithium iron phosphate) is the right choice for almost every UK farm. It is more thermally stable than NMC, far less prone to thermal runaway, and generally lasts more charge cycles. NMC offers higher energy density but is less safe and less durable for agricultural use.
Can you add a battery to existing farm solar panels?
Yes. Battery-only retrofits to an existing farm solar array are straightforward and common, typically using an AC-coupled battery and inverter so the original PV system is left untouched. This lets farms that installed solar before battery prices fell raise the share of their output used on site, provided the farm has an evening or early-morning load to absorb it.
How long do farm solar batteries last?
Battery life depends on how many full cycles the battery does and how it is operated. LiFePO4 generally lasts more cycles than NMC, and the chemistry degrades gracefully rather than failing suddenly. The warranty on each quote states the years or cycles, and the retained capacity, that the manufacturer guarantees: compare those rather than a generic figure.
Can a farm battery earn grid-services income?
Possibly. Larger farm batteries may be able to earn from flexibility or balancing services through an aggregator.
How much self-consumption does a battery add to farm solar?
It depends on the farm's load profile, so no typical percentage is given here. A battery raises the share of the array's output used on site when the farm has an evening or early-morning load (milking, cooling, ventilation) to absorb the stored surplus, and each full cycle shifts at most roughly the battery's usable capacity. Your half-hourly meter data shows how much that could be.