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Most people are familiar with the phenomenom solar energy in its quality of generating electrical power. Solar electricity may be applied in multiple tools serving a variety of functions. Well-known examples are the pocket calculators powered by a PV-cells and off-grid street lighting and emergency telephones along the highway powered by one or more PV-modules. Solar energy became known to the ordinary people in the fifties and sixties of last century due to space programs of the Americans, Russians and to a lesser extent other European countries. Satelites and space capsules were installed with solar cells for power supply of its electrical systems. From that time the application of PV moved slowly from extraterrestrial use to terrestrial application. First and also most widespread applied are the off-grid domestic and non-domestic PV systems. Off-grid domestic PV-systems are installed in households and villages not connected to the utility grid. Usually, a means to store electricity is used, most commonly in combination with a lead-acid battery. Off-grid non-domestic PV serves a variety of applications such as water pumping, remote communications, safety and protection devices etc, at locations without the presence of public grid. Following off-grid PV application, also as a result of the growing attention for renewable energy, from early eighties of last century a tendency could be observed to connect PV systems also to the public grid. Also the field of application moved from undeveloped and rural areas to well developed urban areas equipped with finely meshed public grid.. This webinar gives an overview on PV-systems connected to the public grid.
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Experience you can trust.
Leonardo ENERGY Webinar:Photovoltaic Installations
Ton van der Wekken
9 May 2007
Contents
• Photovoltaic (PV) principle• Market development• Building integrated PV (BIPV)• Examples BIPV• PV technology• Cost breakdown• Example: 5 kWp system• Future trends
Photovoltaic principle: Electricalenergy from solar irradiation
Photovoltaic principle: Gridconnection
Worldwide capacity of installed PV, off-grid and grid-connected
Cumulative installed PV power by application area
0
500
1000
1500
2000
2500
3000
3500
4000
1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005Year
Cum
ulat
ive
inst
alle
d ca
paci
ty [M
W]
Grid-connected
Off-grid
Leading European countriesin PV
Cumulative installed PV European Country 2003 2004 2005 [MWp] [MWp] [MWp] Austria 16.8 21.1 24.0 France 21.1 26.0 33.0 Germany 431 794 1429 Italy 26.0 30.7 37.5 Netherlands 45.9 49.1 50.8 UK 5.9 8.2 10.9 Spain 27.0 37.0 57.4 Switzerland 21.0 23.1 27.1
Building Integrated Photovoltaics(BIPV): Pros and Cons
• Pros BIPV- No or limited permitting procedures- Showing awareness of inhabitants/owners- Generating and use coincide in time and place- Multifunctional application often feasible- High technical potential
• Cons BIPV- Systems are relatively small- Without incentives not cost effective- Additional contract for reimbursement feed-in- At budget cut: PV drops out first
Ground based PV system
Ground Based PV compared totraditional power plants
• Pros ground based PV– Neither air nor noise pollution;– No greenhouse gases;– No visual nuisance.
• Cons ground based PV– A hectare per MWp installed;– High costs per MWp;– Permitting procedures comparable to other
power plants
Residental houses, PV installed on sloped roof
Multifunctional: Roof from semi-transparant PV
Multifunctional:PV integrated in sound barrier
Multifunctional:PV integrated in sun blind
PV-Technology:some facts
• Installed PV power defined as Watt-peak (Wp, kWp and MWp)
• Central and Northern Europe: maximum irradiation1000 W/m2
• Southern Europe: max. irradiation 1700 W/m2
• Optimal orientation: South• Optimal tilt angle PV modules: 35 - 38°
PV-Technology:cell materials and efficiencies
Cell material Cell efficiency [%]
System efficiency[%]
Yearly yield [kWh/m2]
Mono-crystalline (m-Si) 17 13.5 85 - 90
Poly-crystalline (p-Si) 15 12 80 - 85
Thin film (a-Si) 8 6.5 50 - 60
PV-Technology:electrical scheme
PV-Technology:Maximum Power Point Tracking
(MPPT)
Cost breakdown PV system-From 15 to 5 €/Wp in a decade-
PV component Costs [€/Wp]
Modules 4.0 – 4.5
Inverter 0.5 – 1.0
Balance of System (BOS) 1.0
TOTAL 5.5 – 6.5
5-kWp roof integrated PV systemOrientation Sloped roof, oriented south to south-west
Support structure In the roof tile plane upon the roof battens Module support profiles (aluminium) mounted on the roof battens Brackets to clamp the modules on the support profiles
Module data Gross dimensions 0.8 x 1.6 meters, Al frame Maximum power 150 Wp 72 multi-crystalline Si-cells measuring 12.5 x 12.5 cm Module efficiency 13% Junction box including bypass diodes at the back
System layout 32 modules (lay-out 4x8) Gross area 6.4 x 6.4 m (41 m2) Installed power 4800 Wp 4 parallel strings, 8 modules per string connected in series 2 inverters of 2500 W, 2 strings per inverter
Performance 3500 kWh per year
Electrical connection PV system
Two separate electrical connections of 2500 W Two different meterings, one for use by the house equipment and the other for feed-in by the PV-system.
Lifetime Modules and support structure 30 years Watertightness of materials 20 to 25 years Inverters 10 to 15 years
Financial data Turnkey investment € 30,000
Simple Pay Out Time (SPOT) 43 years at € 0,20 /kWh, an average consumer tariff 17 years at € 0,50 /kWh high feed in tariff (based on incentives)
Future developments
• Cost reduction by economics of scale• Thin film cells
– Shortage of crystalline Si boosts thin film – Materials are amorphous silicon (a-Si), copper
indium diselenide (CIS), cadmium telluride(CdTe)
• Concentrator cells (CPV)– Efficiency >20%– Use of mirrors and sun tracking system
• Speral solar technology- Minute silicon beads on Al foil- Less Si material needed
Experience you can trust.
Thank you for your attention!
Any questions?
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