This document contains a summary of a 49.5 kWp photovoltaic system design for Leigh Farm by Martyn Watkinson of DAS Technology Ltd. The system uses 198 Suntech Power solar panels mounted at an angle of 20 degrees. Electricity generated will be exported to the grid, with an expected annual yield of 45,358 kWh. An economic analysis estimates a payback period of 6.3 years and a yield of 15.3% over a 25 year period.

1. DAS Technology L t d
2 Hamilton P l a c e
NG18 5 F A
Designer: Martyn Watkinson
martynwatkinson@dassolar.co.uk
Project Name: Leigh Farm 18/06/2012
Variant Reference: 49.5 kWp
Designer: MGW
22 198 x Suntech Power 3 x SMA Solar Technology AG
STP250S-20/Wd (2012) 250 W Sunny Tripower 15000TL
3
20°; 30° 15.0kW
Location: Fairfield
Climate Data Record: Fairfield (1981-2000)
PV Output: 49.50 kWp
Gross/Active PV Surface Area: 322.12 / 321.69 m²
PV Array Irradiation: 337,332 kWh
Energy Produced by PV Array (AC): 45,358 kWh
Grid Feed-in: 45,358 kWh
Yield Reduction Due to Shading: 1 %
System Efficiency: 13.4 %
Performance Ratio: 87.3 %
Inverter Efficiency: 95.8 %
PV Array Efficiency: 14.0 %
Specific Annual Yield: 915.1 kWh/kWp
CO2 Emissions Avoided: 40,133 kg/a
The results are determined by a mathematical model calculation. The actual yields of the photovoltaic system
can deviate from these values due to fluctuations in the weather, the efficiency of modules and inverters, and other factors.
The System Diagram above does not represent and cannot replace a full technical drawing of the solar system.
PV*SOL Expert 5.5 (R2) 1

2. DAS Technology L t d
2 Hamilton P l a c e
NG18 5 F A
Designer: Martyn Watkinson
martynwatkinson@dassolar.co.uk
Project Name: Leigh Farm 18/06/2012
Variant Reference: 49.5 kWp
Designer: MGW
System in Grid Connected Operation
Location: Fairfield PV Output: 49.50 kWp
Climate Data Record: Fairfield Gross/Active PV Surface Area: 322.1 m² / 321.7
m²
Number of Arrays: 1
Array 1: System 1
Output: 49.50 kW Ground Reflection: 20.0 %
Gross/Active Solar 322.1 m² / 321.7 m² Output Losses due to...
Surface Area:
PV Module 198 x deviation from AM 1.5: 1.0 %
Manufacturer: Suntech Power deviation from Manufacturer's 2.0 %
Specification:
Model: STP250S-20/Wd (2012) in Diodes: 0.5 %
Nominal Output: 250 W due to Pollution: 0.0 %
Power Rating Deviation: 0% Inverter 3x
Efficiency (STC): 15.4 % Manufacturer: SMA Solar
Technology AG
No. of Modules in Series: 22 Model: Sunny Tripower
15000TL
MPP Voltage (STC): 675 V Output: 15.00 kW
Orientation: 30.0 ° European Efficiency: 97.9 %
Inclination: 20.0 ° No. of MPP Trackers: 1
Mount: with Ventilation MPP Tracking: 150 V To 800 V
Shade: Yes
Simulation Results for Total System
Irradiation onto Horizontal: 312,332 kWh Own Use: 61.1 kWh
PV Array Irradiation: 337,332 kWh Energy Produced by PV Array: 47,274 kWh
Irradiation minus Reflection: 328,056 kWh System Efficiency: 13.4 %
Irradiation without Shade: 346,048 kWh Performance Ratio: 87.3 %
Energy from Inverter (AC): 45,358 kWh Final Yield: 2.5 h/d
Consumption Requirement: 0 kWh Specific Annual Yield: 915 kWh/kWp
Energy from Grid: 61 kWh Array Efficiency: 14.0 %
6,000
5,000
4,000
kWh
3,000
2,000
1,000
0
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Energy from Inverter (AC) 45,358 kWh
PV*SOL Expert 5.5 (R2) 2

3. DAS Technology L t d
2 Hamilton P l a c e
NG18 5 F A
Designer: Martyn Watkinson
martynwatkinson@dassolar.co.uk
Project Name: Leigh Farm 18/06/2012
Variant Reference: 49.5 kWp
Designer: MGW
PV*SOL Expert 5.5 (R2) 3

4. DAS Technology L t d
2 Hamilton P l a c e
NG18 5 F A
Designer: Martyn Watkinson
martynwatkinson@dassolar.co.uk
Project Name: Leigh Farm 18/06/2012
Variant Reference: 49.5 kWp
Designer: MGW
Economic Efficiency Calculation
System Data
PV Output: 49.50 kWp
System Operating Start: 01/08/2012 Total Degradation: 15.00 %
Electricity Feed-in
Grid Concept: Full Feed-in
For the First 20 Years: 0.1520 £/kWh
Thereafter: 0.1520 £/kWh
Basic Economic Efficiency Parameters
Assessment Period: 25 Years
Interest on Capital: 0.00 %
All entries without sales tax
Income and expenditure
Investments: 63,000.00 £
Other Income/Savings: 2,212.00 £/a
Incoming subsidies: 685.95 £
Feed-in Payment Received in First Year: 6,894.47 £/a
Results According to Net Present Value Method
Net Present Value: 256,829.46 £
Payback Period: 6.3 Years
Yield: 15.3 %
Electricity Production Costs: 0.05 £/kWh
Cash Balance (Accrued Cash Flow)
250,000
200,000
Cash Values [£]
150,000
100,000
50,000
0
-50,000
2 4 6 8 10 12 14 16 18 20 22 24 26
Years
PV*SOL Expert 5.5 (R2) 4

5. DAS Technology L t d
2 Hamilton P l a c e
NG18 5 F A
Designer: Martyn Watkinson
martynwatkinson@dassolar.co.uk
Project Name: Leigh Farm 18/06/2012
Variant Reference: 49.5 kWp
Designer: MGW
Detailed List of all Payments Received and Made
Investments
Position Service Life [a] Inflation [%] Amount[£]
Investments 26 0.00 63,000.00
Incoming subsidies
Position Amount[£]
Incoming subsidies 685.95
Other Income/Savings
Position Inflation [%] Amount[£]/a
Other Income/Savings 3.00 2,212.00
Income from Export to utility grid
Position Inflation [%] Amount[£]/a
Income from Export to utility grid 3.00 6,894.47
PV*SOL Expert 5.5 (R2) 5

6. DAS Technology L t d
2 Hamilton P l a c e
NG18 5 F A
Designer: Martyn Watkinson
martynwatkinson@dassolar.co.uk
Project Name: Leigh Farm 18/06/2012
Variant Reference: 49.5 kWp
Designer: MGW
System Visualization Screenshots
Environment
Screenshot2
Module Coverage
Screenshot5
Module Configuration
PV*SOL Expert 5.5 (R2) 6

7. DAS Technology L t d
2 Hamilton P l a c e
NG18 5 F A
Designer: Martyn Watkinson
martynwatkinson@dassolar.co.uk
Project Name: Leigh Farm 18/06/2012
Variant Reference: 49.5 kWp
Designer: MGW
Screenshot7
PV*SOL Expert 5.5 (R2) 7