PV Best Practice

8/7/2019 PV Best Practice

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Grid-connected PV installation

Best practice guidelines

1AuSES PV Installation Best Practice Workshop


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Why best practice?

AS/NZS mandate minimum requirements

Best practices go above and beyond and

include non-technical aspects

Improve the quality/reputation of the PV

industry

Some best practices may be included in

new versions of AS/NZS

2AuSES PV Installation Best Practice Workshop


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Before installation

Visit customers site before preparing

quote, dont use satellite imagery

Watch out for shading

Solar Pathfinder, SunEye, mobile phone apps,

visual estimate

Plan cable routes, inverter location, panel

layout Minimize effect of shading

AuSES PV Installation Best Practice Workshop 3


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Before installation

Watch out for meter box upgrades

Give a firm quote, no hidden costs

Give a timeline to installation and stick to

it

Assist with regulatory approvals

Grid connection, planning, RECs



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Before installation

Give an accurate estimated energy yield

(in writing)

PVSyst

RETScreen

Manual calculations using BOM or NASA or

the ASRDH



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Before installation


Azimuth

-90 -60 -30 0 30 60 90

Inclination

0 90% 90% 90% 90% 90% 90% 90%

15 88% 93% 96% 98% 96% 93% 88%

30 83% 92% 98% 100% 98% 92% 83%

45 77% 88% 95% 97% 95% 88% 77%

60 69% 80% 87% 90% 87% 80% 69%

75 60% 70% 77% 78% 77% 70% 60%

90 51% 59% 63% 63% 63% 59% 51%


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Health and Safety



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Health and Safety



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PV modules



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PV modules



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PV modules



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PV modules



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A note on fuses

Overcurrent protection may be requiredwhen multiple stings are connected in

parallel

AS/NZS 5033:2005 provides sizingrequirements for overcurrent protection

AS/NZS 5033:2005 does notprovide

mandatory trip times for protection



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A note on fuses

IEC 61730.2 tests modules to withstand135% of the maximum series fuse rating

for 2 hours

=> size overcurrent protection so that it

does not trip under normal operation, but

trips within 2 hours of an overcurrentsituation. Look at fuse/MCB

manufacturers datasheets.



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A note on fuses



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Polarized DC circuit breakers

Pay attention to thedirection of current

Generally speaking,

the PV array goes inthe terminals marked

+ and

Check wiring withmanufacturer



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DC cabling



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DC cabling



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DC cabling



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DC cabling



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DC cabling



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Inverters - good



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Inverters - good



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Inverters - better



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Inverters - best



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Inverters - best



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Labelling and documentation



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Documentation should be given tocustomer after installation is complete:

Overall working of system

Data sheets and handbooks (PV modules,inverters, mounting rails)

List of equipment supplied, with serial

numbers

Wiring diagrams and string layout



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Commissioning sheet and installation checklist

Expected annual yield

Warranty certificates and manufacturers

contact details Maintenance procedures, shutdown

procedure, alarms installed and action

required.



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Thank you

AuSES PV Installation Best PracticeW k h 31

PV Best Practice

Documents

Transcript of PV Best Practice