Incoming and Outgoing Shipments in 3 STEPS Using Odoo 17
PV Installations & Errors
1. PV Installations & Errors
Prevent Errors upfront
Andreas Iliou / Suntech
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2. Photovoltaic Systems
Energy Audits
Protection
Maximum Power Point Tracking (MPPT)
Weak light – Shading
Microcracks Production,
during Transport and Installation
Photovoltaic Systems
Energy Audits
Protection
Backfeed Current
Leakage Current
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3. 01
Photovoltaic Systems
Energy Audits
Protection
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4. Reason for less power output
Power Plant with less kWh/kWp compared
with nearby installations
Planning layout / Optimization
Mismatch losses due to wrong inverter / module
combination (high losses ) resize cable diameters
Strings not correctly installed,single modules not
Connected polarity wise – connectors without contact
Mismatch losses can be changed regards inverter
e.g Multistring inverter agains 1 Tracker
Shading not upfront recognised, restring or
reinstallation of different invertertype
Cleaning of inverters regularly (heat transfer /cooling!)
to hot surface temperature at cooling and/or AC side
testing procedureI-V curve testing
All Rights Reserved Source Iliou
5. Reason for less power output
Power Plant with less kWh/kWp compared
with nearby installations
Planninglayout/Optimizing
Distance of inverters to close by
Inverter cools down from right to left therefore
heating up uneccessarily second and third inverter
Losses due to planning and/ or installation
mistakes accumulates up to 250 W losses
Systems runs without ( Datalogger )
no stringcontrol,
Inverter covered and overheats , built in a small room
no cooling possible,
cuts off frequently without problems
Iso faults, shortcuts etc.
All Rights Reserved Source Iliou
6. Reason for less power output
Inverters must be installed according manual
Source Mastervolt
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7. Reason for less power output
Alternative Solution: Board can be used to split incoming Air
All Rights Reserved Source Mastervolt
8. Reason for less power output
Different topologies involved
All Rights Reserved Source google
9. Reason for less power output
Shaded or already to less modules planned
All Rights Reserved Source Iliou
10. Reason for less power output
Shaded or already to less modules planned
All Rights Reserved Source Iliou
11. Optimising Power output
Optimum East- / Westconfiguration: 2:1 = 2 Strings right and 1 String left
3:1 = 3 Strings right and 1 String left
All Rights Reserved Source Iliou
12. Tests to determine less power output
Shaded or already to less modules planned
Check of all AC outlets
Check of all earth wires
Polaritytest of each string
Testing of all Stringvoltages
Measurements of shortcut current
Isotest of all DC strings
Performance test and visual inspection
of all components
All Rights Reserved Source Iliou
13. Tests to determine less power output
Check poweroutput with the Voltage AC grid
All Rights Reserved Source Iliou
14. Testing procedure – less power output
Shaded or already to less modules planned
• Visual Inspection Check of all AC outlets
• Isolationtest
• Check of all deactivation figures
• Cable size and resistance check
• Values should be underneath <1 Ohm
• Feed in AC checked with AC site
All Rights Reserved Source Iliou
15. Testing procedure – less power output
Shaded or already to less modules planned
• Are modules covered with grease or dust ->
please check
• Contacts faulty , check each single string
• Bushes or trees grown up
Is it possible to increase or still decrease MPPT
from the inverter or are to less modules connected
when Shading occures with more than 1 single
module
Involved.
Temperature zone concept been used
Are more systems already been built in the
neighbourhood
All Rights Reserved Source Iliou
16. Testing procedure – less power output
No power output during daytime
Shaded or already to less modules planned
Meter doesn t turn
Still to dark outside, check later on again
Circuit breaker turned down ?
Switch defect ?
Lightning protection device faulty? ->current flowing
During winter everything worked fine , ½ year later
extremely poor output achieved
always during high peak and high temp->low output
Power failure Main Grid
Iso fault with no reason, check contacts involved
Single test of each string
Data locked at inverter -> please check
Failure in AC Supply , please check with earth loop tester
All Rights Reserved Source Iliou
17. Less power output due to stray currents
All Rights Reserved Source Iliou
18. Less power output due to stray currents
All Rights Reserved Source EP
19. Less power output
cause is stray , and ground currents
PE+Neutral bound together- lot s of stray currents ,more losses
All Rights Reserved Source EP
20. Less power output
cause is stray , and ground currents
PE+Neutral seperate - NO currents ,less losses involved
All Rights Reserved Source EP