Solar Panels for Farm Workshops

Farm Workshop Energy Loads: What Solar Can Offset

Farm workshops are among the most varied electricity consumers on an agricultural holding. The mix of welding equipment, power tools, battery chargers, lighting, compressors and machine-shop lathes creates an energy profile that is typically highest during daylight hours — an ideal match for solar generation. For farms where the workshop operates 6-8 hours daily during working hours, self-consumption rates of 80-90% are achievable without battery storage.

A well-equipped farm workshop consuming 35,000-80,000 kWh annually at a commercial tariff of 27p/kWh spends £9,500-£21,600/year on electricity. A 30-50kW solar array sized to the workshop's daytime load generates 27,000-45,000 kWh annually in the UK, saving £7,300-£12,150/year at the same tariff rate. Payback periods of 3-5 years are typical when Annual Investment Allowance tax relief is applied.

Sizing Solar for a Farm Workshop: The Right Approach

The temptation with farm workshop solar is to maximise the roof area available — large machinery stores often have 500-1,000 sq m of south-facing roof that could accommodate 75-150kW of panels. However, over-sizing relative to the workshop's actual consumption pushes self-consumption rates down (more electricity exported at the lower SEG rate), which weakens the financial case.

The optimal approach is to assess the workshop's half-hourly consumption data (downloadable from a smart meter) and size the solar array to match the peak daytime load. For a workshop with a 20kW average daytime demand, a 25-30kW solar system captures 85-90% self-consumption. Increasing this to 50kW might raise generation but drops self-consumption to 60-65%, significantly reducing per-kWh savings.

If the farm has a larger machine store or livestock building adjacent to the workshop, connecting all roofs to a single centralised inverter and battery system provides better economics than per-building installations. A shared 200kWh LFP battery captures afternoon excess solar generation and delivers it to evening/overnight battery charging, tractor warm-up and early-morning starts.

Planning and Permitted Development for Workshop Solar

Solar panels on a farm workshop building benefit from permitted development rights under Class A of the GPDO, subject to the building not being listed and the panels not protruding more than 200mm from the roof. For farm workshops on agricultural units of 5 hectares or more, Class R also permits ground-mounted solar installations up to 5MW (post-2023 amendment) with prior approval rather than full planning permission.

In practice, most farm workshops are treated as agricultural buildings, and roof-mounted solar is almost universally permitted development. The exception is workshops in the curtilage of a listed farmhouse, where permitted development rights may be restricted. A pre-installation planning check by your installer confirms the applicable rights for your specific site.

Grid Connection for Farm Workshop Solar

Farm workshops are often supplied by a separate electricity meter from the farmhouse, typically a three-phase 100-200A supply. Where the workshop has its own meter, a solar system can connect directly to that supply under G98 (for systems under 50kW) or G99 (for systems over 50kW). For workshops sharing a meter with other farm buildings, careful electrical design ensures the solar system feeds into the correct distribution board and is metered correctly for SEG purposes.

Choosing the Right Installer for Farm Workshop Solar

Farm workshop solar requires installers with experience in agricultural environments — not all commercial solar installers are comfortable working with farm access constraints, asbestos risk assessments, or the three-phase supply configurations common in rural areas. Key questions to ask potential installers: Are they MCS-certified? Do they have experience with NGED/NPg/SSEN/UKPN agricultural connections? Do they carry agricultural public liability insurance? Can they provide references from similar farm building installations?

Our MCS-certified installation team has completed over 200 agricultural solar projects across all UK DNO areas. We provide a complete service from initial roof assessment and structural check through DNO application, installation, commissioning and SEG registration. All installations carry a 5-year workmanship warranty backed by our UK-based service team.

Solar panel installation on farm workshops typically takes 1-2 days and causes minimal disruption to daily farm operations. Our agricultural installation team works around farm schedules and can complete roof work during quieter seasonal periods.