Warehouses and distribution centres are, without question, the best possible candidates for commercial solar panels. Large flat roofs, very high electricity consumption, minimal shading and strong daytime usage patterns all combine to create outstanding solar returns — often with payback periods under 3 years. If you operate a warehouse, distribution centre or light industrial facility near Cardiff, this guide is for you.
Why Warehouses Are the Best Solar Investment
Warehouses typically have 1,000–20,000 sq metres of flat, accessible roof. That means huge solar array capacity and potentially enormous annual generation.
Warehouse electricity loads from lighting, forklifts, conveyors, climate control, offices and charging stations mean 80–95% of generated solar is consumed on-site.
Flat warehouse roofs typically have no chimneys, dormers or nearby buildings to shade panels. Clean, uninterrupted sun exposure gives maximum generation.
High self-consumption + large system + 0% VAT + capital allowances = payback periods of 2–4 years. It is genuinely one of the fastest-payback commercial investments available.
Typical Warehouse Solar System Sizes & Costs
| Warehouse Size | System Size | Annual Output | System Cost | Annual Saving |
|---|---|---|---|---|
| 1,000 sq m | 30kW | 25,500 kWh | £22,000–£28,000 | £7,600–£8,500 |
| 2,500 sq m | 75kW | 63,750 kWh | £52,000–£65,000 | £19,000–£21,000 |
| 5,000 sq m | 150kW | 127,500 kWh | £100,000–£130,000 | £38,000–£43,000 |
| 10,000 sq m | 300kW | 255,000 kWh | £180,000–£240,000 | £76,000–£85,000 |
| 20,000 sq m | 500kW+ | 425,000+ kWh | £280,000+ | £127,000+ |
Flat Roof Mounting Options for Cardiff Warehouses
Cardiff Warehouse Solar — Key Locations
GL Solar has installed warehouse solar systems across Cardiff and South Wales commercial estates. Key areas where we regularly work:
Case Study: Newport Distribution Centre
Property: 6,000 sq m distribution centre on Newport M4 corridor. Flat roof, south-facing, minimal shading.
System: 180kW solar array (450 × 400W panels) on ballasted A-frames. Total installed cost: £124,000 (after 0% VAT applied).
Generation: 153,000 kWh in Year 1. Self-consumption: 88% (134,640 kWh used on-site).
Financial result: £40,400 electricity cost saving (Year 1). £2,750 SEG export income. Total Year 1 benefit: £43,150.
Payback period: 2.9 years. After enhanced capital allowance tax relief (25% corporation tax): effective payback 2.1 years.
Free Warehouse Solar Survey
We survey Cardiff, Newport, Barry, Bridgend and South Wales warehouses daily. Free structural assessment, energy audit and detailed ROI proposal.