1. PV Solar Design & Installation
Consideration for Net metering fixed PV
For low or high voltage grid connected
Prepared by Eli Israeli, Green in Grid solar, May 2015
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2. Net Metering Equivalent to Energy Storing
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3. A Basic Threshold
• Aluminate shadowing on the Panels
• Sustainable roof structure
• Active consumption
• Electricity board and cables infrastructure
• Registries for IEC’s available quota
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4. Permits
• IEC’s Conditional license
(Temporary and more the 50KW systems)
• Authorities building permit (more the 50KW)
• Constructor and Electrical Engineer permit
• Fire fitter requisite and permit
• IEC’s permanent license for production
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5. Which parameters effect on the producing
• Soiling level and hot spot
• Panel PID phenomenon
• Panel reflection and degradation
• Mismatch between the panels
• Inverter efficiency by load rate
• Ambient Temperature Air ventilation
• IEC grid quality such as Cos Ƥ (PF), different
phase voltage, harmonics, spicks and Etc.
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6. Optional Additions/Upgrade
• Main cable diameter depend on the current and distance
from the main board.
• Main board, in case nan IEC standard
• Lightning rods protection connect to GND
• (In specific areas)
• Top-roof upgrade for Asbestos, sealing or any obstacle
effect the PV array
• Roof Construction Strengthening in case of light roof no
compliable for PV panel + constriction weight and wind
load (according to the standard)
• PV plant is not an alternative of Generator. In case GR
connected, PV switch-off automatically
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7. Initial Design milestones
• Technical survey
• Roofs measurement
• Pre-design, sketches and imagining as option
• Build an ideal place for Inverters, switches, DC &
AC boards and switchgear (normally indoor)
• Poisoning deployment PV layout
• Simulation analyzing and output power
• Structure plan for the PV array and the inverters
• Detail plans DC and AC including SLD
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8. PV array deployment
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9. Simulation
• Simulation helps to indicate the system
performance and predict the production
• Simulation shows the analyzing and using
base for system optimization
• PVsyst software in being used by the most of
the designers.
• Bankability (confirmed by the bank for credit)
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10. System Losses and shadowing
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11. Single Line Diagram
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Generator changeover

12. Detail design and specifications
• DC string , array topographic
• Contracture design
• Panels and inverter manufacture choosing
• DC & AC cable infrastructure routing plan
• DC and AC cable distances and loss
• Grounding concept and connections
• Electrical protection calculation and load flow
• One line diagram module to the main board
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13. Protections and Safety
• PV system is not a source of hazard radiation
• PV system committed to conform by IEC low
and Electrical standard
• System protection by Switch, relays
overvoltage and other devices
• Fire fitter standard
• Safety element install in the plant area
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14. Main Project Milestones
• First step for project rating
• Map the final PV affective area
• Opening request in IEC (deposit payment)
• Conditional permit receiving (Above than 50KW)
• Foundation and infrastructure preparation (Construction
installation and cable channels)
• Receiving the equipment and panels installation
• Electrical concretions Inverters installation and setup
• IEC inspection and reject action
• Fine tuning , configuration, production metering
installation
• Electrification for the IEC grid
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15. Monitoring
• How to know how your system is good or bad?
• Monitoring system present the producing data
• The precise indication for the system testing call
PR, the performance ratio, Normally a good PR is
above 78%
• PR = Energy out (actual) / Energy in (reference)
• Energy in = measure by the Metrologic sensors
• Energy out = measure by the electricity output
• Receiving a management reports
• Receiving alerts (Inverter fail, difference..)
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16. Preparing for installation
• Check list
• Visual inspection
• Measuring and mapping
• Preparing non penetration foundation base for
the construction
• Prepare functional and safe place for the solar
equipment (Panels, inverters and boards)
• Water filter infrastruction on the roof for panel
washing as possible
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17. Installation process
• Construction
Construction is preliminary step.
Construction anchoring and foundation
Building the internal stand
The classic construction made from Aluminum
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18. Installation non conventional construction and frameless
made by SolaticsTM
 Lightweight
– In some configurations as low as 2.5kg/m2
 Durable design and manufacturing
– Providing industry leading long-term reliability
 Novel attachment system
– No need for racking & brackets
– Lower BOS cost (balance of system)
– Low installation costs - Faster and easier installation
 PID
– PID free design
– Better/cheaper invertors possible
 Highly versatile, beautiful design
– Ultra thin – from 4mm
– Easy integration into structures
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19. Installation process (Continue)
• Panels classification and installation
• Cable DC and AC tunnels and wiring
• DC and AC protection devices
• Inverter connection
• Signage and labeling for item identification
An example below
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20. IEC test, Metering and grid connection
• IEC final inspection for the PV plant
• Producing metering monitor by IEC and use
for the annual credit offsetting
• PUA operation permit
• Electrification and power producing
• O&M for the next 25 years
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21. Actual Improvements in PV
• More PV panels but lower panel tilt
• Panels efficiency incising
• Better system optimization
• Movement toward increased DC voltage
• Micro-inverters and Power sharing
• Panel and strings losses improvement
• Energy Storing
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22. 100KW Project Time table
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23. Thank you
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Link to Green In Grid Website