Solar Panels for Grain Stores

Grain stores are among the most financially compelling buildings for solar in UK agriculture. Massive roof areas combine with harvest-season energy peaks to deliver rapid payback, while year-round generation powers the broader farm operation.

Why Grain Stores Excel for Solar

The unique energy profile of grain storage and drying operations creates an exceptional financial case for solar panels, with demand peaks aligning closely with peak solar generation.

Grain Drying Energy Profile and Solar Alignment

Understanding how grain drying energy demand aligns with solar generation is key to sizing the right system. The overlap is remarkably strong in the UK climate.

Harvest Season (August-October)

Grain dryers run at maximum capacity during the period when solar panels are still generating 70-85% of their summer peak. A 100kW system generates approximately 300-400kWh per day during this period, directly offsetting dryer electricity costs at peak tariff rates.

Winter Storage (November-March)

Ambient ventilation fans maintain grain condition through winter. Solar generation is lower but still covers daytime fan operation. Battery storage extends solar contribution to overnight ventilation cycles.

Off-Season (April-July)

Peak solar generation period when grain stores are empty. Electricity powers farm workshops, offices, irrigation, and other operations. Surplus generation exports to the grid via the Smart Export Guarantee at 4-15p/kWh.

Grain Store Solar Costs

Battery Storage for Grain Drying Operations

Battery storage transforms grain store solar economics by capturing excess daytime generation for overnight drying fan operation, pushing self-consumption rates above 80%.

Grain Store Solar FAQs

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Related Farm Building Solar Pages

Explore solar solutions for other agricultural building types.

Highlights

• 50kW
• ~250m² roof
• £40,000-£55,000
• £12,000-£15,000/yr
• 100kW
• ~500m² roof
• £75,000-£100,000
• £25,000-£30,000/yr
• 200kW
• ~1,000m² roof
• £150,000-£200,000
• £50,000-£60,000/yr

• Daytime Charging
• Batteries charge from excess solar production during daylight hours when generation exceeds the grain dryer and fan demand.
• Free stored energy
• Overnight Discharge
• Stored energy powers ventilation fans through the night, avoiding peak and off-peak grid tariffs that add up quickly over months of continuous drying.
• £0.25-£0.35/kWh saved
• Peak Shaving
• Batteries reduce maximum import demand, lowering capacity charges for farms on half-hourly metering. This alone can save £2,000-£5,000 annually.
• Reduced standing charges