20111010 gcs training wuxi common mistakes in planning and installation - v02

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Information about 20111010 gcs training wuxi common mistakes in planning and...
Technology

Published on February 6, 2014

Author: andreasiliou

Source: slideshare.net

Description

The not so confidential planning and installation issues
made during Energy Audits
2011 onwards

WUXI GCS Workshop Common mistakes in planning and installing PV systems in Germany October 2011 Andreas Iliou Technical Customer Service Engineers Germany

Content 2 1. Common mistakes in planning a PV system 2. Common mistakes in installing a PV system 3. Consequences for Claim Management Suntech confidential

3 1. Common mistakes in planning a PV system Suntech confidential

Planning mistakes a) Shadowing (can cause Bypass diode damages) b) Temperature zones (performance issues) c) Layout of the panels (vertical, horizontal) (performance issues with dirt) d) Snow loads (glass breakage or frame damage) e) EMC and surge protection (can cause surges and Bypass diode damages) Suntech confidential 4

a) Shadowing (1) Plan your solar plant w/o shadow (12PM on the shortest day of the year (Dec/21))! Suntech confidential 5

a) Shadowing (2) Plan your solar plant w/o shadow (12PM on the shortest day of the year (Dec/21))! Suntech confidential 6

a) Shadowing (3) Plan your solar plant w/o shadow (12PM on the shortest day of the year (Dec/21))! Suntech confidential 7

b) Temperature Zones Connect all panels together which are in one horizontal temperature zone! Suntech confidential 8

c) Layout of the panels Optimize the string layout aiming for: • matching string lengths for various strings (same string length for all strings) • horizontal or vertical layout for a good mounting solution • inclination should be >10°to effectively remove dirt (self cleaning effect) • leave sufficient space between the panels for thermal expansion Suntech confidential 9

d) Snow Load and Wind load Check for a suitable mounting solution according to the snow load zone: • for a higher snow load zone (Bavarian forest), a higher mechanical load must be chosen • Installation Manual p. 9 • Modules should not be installed to narrow to roof-top limits • mounting surface; >15m space between mounting structures Suntech confidential 10

e) EMC and surge protection Always do not separate the plus pole and the minus pole on distance as it creates Electrical fields! Suntech confidential 11

12 2. Common mistakes in installing a PV system Suntech confidential

Installation mistakes a) Mounting systems (glass breakage) b) Loose cables and connectors (connectors burnt) c) Grounding and Earthing (equipotential) d) Dirty panels e) Inverter dimensioning (performance issues) Suntech confidential 13

a) Mounting systems Suntech confidential 14

b) Loose cables and connectors Suntech confidential 15

c) Grounding and Earthing Suntech confidential 16

d) Dirty panels 17 Suntech confidential

e) Inverter dimensioning • For Germany, a typical dimensioning is DC/AC: 110...115% depending on orientation, installation type, inverter, heat dissipation • Always double-check with the inverter manufacturer sizing tool if the string length and the dimensioning is done properly! Suntech confidential 18

19 3. Consequences for Claim Management Suntech confidential

Planning & Installation mistakes • Influences on Performance: – dirty panels cause up to 10% losses – wrong string connections (too short, too long) cause around 1...5% losses – shadowing can cause up to 50% losses – a wrong panel layout (with temperature zones) can cause around 1...10% losses – loose connectors can cause up to 5% losses Suntech confidential 20

Planning & Installation mistakes • Influences on Bypass diode: – missing surge protection can cause Bypass diode damages – permanent shading can cause Bypass diode damages Suntech confidential 21

Planning & Installation mistakes • Further Influences: – Glass breakage: too tight mounting solutions can cause glass breakage – Hot Spots: permanent dirt on the panel has not been cleaned and can cause hot spots – Isolation issues: inconsistent grounding in the field can cause isolation issues with the inverter and the panels Suntech confidential 22

THANK YOU! October 2011 Andreas Iliou Technical Customer Service Engineers Germany

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