Solar Voltaics delivered a 139.03 kWp commercial solar installation Chesterfield at Chesterfield Royal Hospital, supporting NHS sustainability objectives while reducing long-term operational energy costs across the estate.
Located in Derbyshire, this hospital solar PV installation was engineered to meet strict structural compliance requirements while delivering predictable long-term generation performance.
Designed using advanced PV simulation software and engineered to meet strict structural compliance standards, this hospital solar PV installation demonstrates how public-sector buildings can deploy rooftop solar safely, efficiently and at scale.
Project Overview – Commercial Solar Installation Derbyshire
This grid-connected commercial rooftop solar system was designed to maximise available roof space while maintaining full structural compliance and long-term performance reliability.
Key System Data
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System Size: 139.03 kWp
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Number of Modules: 335
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Panel Type: JA Solar JAM54S30-415/MR (415W)
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Inverters: 4 × SolarEdge three-phase inverters
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Mounting System: Renusol VarioSole+ (Kalzip standing seam compatible)
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Total PV Surface Area: 654.2 m²
The system was modelled using PV*SOL Premium software with Meteonorm climate data for Derbyshire to ensure accurate generation forecasting and performance validation.
Performance Metrics – Hospital Solar PV Installation
This commercial solar installation in Derbyshire was designed for high-efficiency output with minimal shading losses.
Forecast Annual Performance
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Specific Yield: 923.95 kWh/kWp
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Performance Ratio: 87.31%
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Shading Losses: 2.3%
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Estimated Annual Generation: 128,555 kWh
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Annual CO₂ Savings: 60,373 kg
That equates to over 60 tonnes of carbon reduction per year, directly supporting NHS Net Zero objectives.
Financial Impact – Commercial Solar ROI
Healthcare facilities operate during daylight hours with consistent baseload demand, meaning on-site solar generation can be utilised efficiently.
Based on a conservative commercial electricity rate of £0.22 per kWh:
Estimated Annual Value of Generation:
£28,282 per year
Over a 25-year system life (excluding inflation and tariff increases):
£700,000+ potential electricity offset
With energy prices historically volatile, long-term solar deployment provides predictable cost control and budget stability.
Structural Engineering & Compliance
For large public-sector buildings, structural compliance is critical.
The Renusol VarioSole+ mounting system was installed on a Kalzip standing seam roof and validated in accordance with:
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Eurocode 0
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Eurocode 1 (Wind & Snow Loads)
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Eurocode 9 (Aluminium Structures)
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BRE Digest 489
Structural Validation Results
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Static utilisation factor: 95–96%
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Fastener utilisation: 95–96%
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Rail utilisation: up to 60%
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Clamp utilisation: 31%
Full statics verification was successfully completed, ensuring safe long-term operation under UK wind and snow load conditions.
Scope of Works
Solar Voltaics provided a full turnkey commercial solution, including:
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Detailed feasibility assessment
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PV system design and yield modelling
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Structural mounting design
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Supply and installation of all solar equipment
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Electrical integration with existing infrastructure
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Testing and commissioning
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O&M documentation and performance reporting
Why This Commercial Solar Installation Matters
This hospital solar PV installation in Derbyshire demonstrates how large public-sector estates can:
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Reduce operational expenditure
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Cut carbon emissions at scale
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Improve energy resilience
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Futureproof against energy price volatility
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Meet sustainability reporting requirements
For estates managers and procurement teams, commercial rooftop solar offers a measurable, asset-backed sustainability investment with long-term financial returns.
Technical Summary
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139.03 kWp installed capacity
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128,555 kWh annual generation forecast
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87.31% performance ratio
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60 tonnes CO₂ reduction per year
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25+ year operational lifespan
Considering a Commercial Solar Installation in Derbyshire?
Solar Voltaics designs and delivers compliant, performance-modelled commercial solar installations across Derbyshire and the wider UK, including hospitals, universities, agricultural estates, schools and industrial facilities.
If you are evaluating a hospital solar PV installation or large-scale rooftop solar system, our team can provide a full feasibility assessment, ROI modelling and structural compliance review.
