Leaf M500-S User manual

MICROINVERTER M500-S
Installation Manual
Venetronic is the electronics division of VeNetWork spa, a company founded by a
group of 42 business owners from across Italy’s Veneto region. The Company is
headquartered in the Veneto and has operations in 85 countries across the globe.
The mission of VeNetWork is to promote business culture via the funding and
development of new manufacturing companies and service providers that will
generate economic, professional and cultural value for the area.
www.venetronic.it - [e-mail]
LEAF SpA
Via Forgaria, 7 - Z.I. Ponterosso
33078 San Vito al Tagliamento (PN) Italy
Tel. [phone]
www.leaf-eng.com - [email protected]

MICROINVERTER M500-S
November 2014
Copyright LEAF SpA
TECHNICAL DATA
DC Input
Recommended PV Input Power (STC)
500 ... 560 Wp
Input Voltage Upper Limit (Max) 90 V
Starting Voltage (Min) 40 V
Operative Voltage Range (Min-Max) 20 … 85 V
MPP Voltage Range (Min-Max) 30 … 75 V
Input Current (Max) 11 A
Internal Output Transient-Overvoltage Protection
Yes
AC Output
Active Output Power (Max) 460 W
AC Grid Connection and Nominal Voltage 1N/PE AC 230 V
Output Current (Max) 2.0 A
Nominal Frequency 50 Hz
Power Factor Range 0.90 capacitive … 0.90 inductive
Reactive Power Control Range -48.3% … +48.3% nominal power
Low Voltage Fault Ride Through (LVFRT) Yes
Max Output Fault Current 5.6 A
Internal Input Transient-Overvoltage Protection
Yes
Max Units per Branch Circuit 9/15 for 20/32A breaker
96%
94%
99%
Mechanical Data
Dimensions (W x H x D)
253 x 48 x 247 mm
Weight
2.4 kg
Ambient Temperature Range -40 … +65 °C
Cooling Natural convection
Degree of protection (EN 60529)
IP65
Electrical Safety Class Class I
Topology
High frequency isolation transformer
Connectors
DC Input: MC-4/AC Output: Wieland RST20I3S
PV-Modules Compatibility
2 x 60 Cells (series), 1 x 72 Celles
Norms & Standards CE, CEI 0-21, CEI 0-16, EN 62109-1, EN 62109-2,
VDE-AR-N 4105, VDE 0126-1-1
Communication
Power Line Communication (P.L.C.)
Warranty 20 years

INDEX
1. INTRODUCTION 4
3
INSTALLATION MAP
1.1 Recipients
1.2 Conventions used in this manual
1.3 Safety notes
1.4 Compliance requirements of the installation
CLIENT DATA INSTALLER DATA
ORIENTATION
(Insert geographical orientation and roof slope)
Company:
4
4
4
6
4. MOUNTING THE LEAF MICROINVERTER M500-S 9
4.1 Fixing LEAF Microinverter M500-S
4.2 Connecting the AC BUS
4.2.1 Connection without WIELAND distribution units
4.2.2 Connection with WIELAND distribution unit
4.3 Connecting to the PV panels
4.4 Connecting the AC distribution network (Grid)
9
9
10
10
11
12
3. LEAF MICROINVERTER M500-S 7
3.1 Label
3.2 Wiring
Roof section N. ___
7
7
APPENDIX 13
Technical Details of LEAF Microinverter M500-S
Installation Map
13
14
2. GETTING STARTED: ANALYSIS OF THE CLIENT SITE 6
5. REMOVING A LEAF MICROINVERTER M500-S 12
14
Address:
City:
Company:
Address:
City:

1. INTRODUCTION
1.1 Recipients
13
4
LEAF Spa reserves the right to change the information in this manual without notice: check the website www.leaf-eng.com for
latest updates.
Please retain a copy of this manual for future reference.
This manual is intended for professional installers and personnel responsible for the installation and commissioning of the
photovoltaic system.
Installation and maintenance personnel of the photovoltaic system should be trained to specic regulations of the country in
which the plant is realized and should be aware of all the security procedures provided by law.
1.3 Safety notes
The LEAF Microinverter M500-S is equipped with an isolation transformer between the PV side and the grid network, with
insulation of reinforced type.
Before installing and using any LEAF Microinverter M500-S, be sure to have read and fully understood the instructions provided
in this manual.
1.2 Conventions used in this manual
This manual uses the following symbols and conventions, which should be noted and followed scrupulously.
DANGER
Indicating unsafe practices that could result in death or serious injury if not performed correctly.
WARNING
It is used to indicate operations that may affect the proper functioning of the device.
HOT SURFACE
It indicates operations that may cause burns and serious damage in case of contact with hot surfaces.
NOTE
It is used to highlight particular requirements of the installation process.
Technical Details of LEAF Microinverter 500-S
Environmental category: Outdoor Use
Pollution Degree: Pollution Degree 3
Degree of protection: IP65
Ambient temperature range of -40 ° C to +65 ° C
Relative Humidity 4% to 100%
Overvoltage category - side DC input: Overvoltage II
Overvoltage category - side AC output: Overvoltage III
Do not use the LEAF Microinverter M500-S in a manner not specied by the manufacturer.
Carefully read the instructions in this manual before proceeding with the installation of the LEAF Microinverter M500-S
and the PV system.
The DC leads of the photovoltaic system are not connected to the ground and may be energized.
The installation and/or replacement of LEAF Microinverter M500-S should be performed only by qualied personnel.
All parts of the PV system must be implemented in compliance with local and national regulations on electrical systems.
All parts of the plant must be kept dry before and during the connection and the installation.
Lightning Protection
To avoid voltages induced by lightning, the wiring of the PV must be placed as a derivation of radial or single type: Do
not use closed loop electrical circuits, which could trigger unwanted antenna effects.
According to local and national standards, additional active protections against lightning strikes may be required
Insulation of the AC wiring
The AC wiring coming from the microinverter must ensure electrical isolation from the mains (for example by means of
APPENDIX

4.4 Connecting the AC distribution network (Grid)
5
After verifying the correct performance and functioning of all the parts of the PV system, the connection to the AC grid can be
established, with all the protection devices in place.
12
switches), so to allow safe inspection, detection of any faults, testing and maintenance operations.
Never disconnect a LEAF Microinverter M500-S or any part of the photovoltaic system without having previously exclu-
ded the AC distribution network.
Never disconnect the terminals from the PV panel during the operation of the LEAF Microinverter M500-S. To
disconnect a microinverter from the plant do the following:
• From the power distribution system, detach the section where there is the microinverter to disconnect
• Remove the PV connectors
• Remove the AC plug
All LEAF microinverters and the metallic elements of the system must always be connected to ground in accordance
with local and national electrical standards.
If the LEAF microinverter, or any accessory described herein, shows any of the following characteristics, remove it from
the plant following the instructions, and contact your distributor or installer:
• The power cables appear damaged.
• You suspect that liquid has penetrated into the product.
• The product was exposed to heavy rain or water.
• The product does not operate properly.
• The product has been dropped or has suffered any damage.
• There are noticeable signs of overheating.
The aluminum body of the LEAF Microinverter M500-S serves as a heatsink and can reach high temperatures, therefore
it should not be touched during operation.
The proper functioning of the LEAF Microinverter M500-S is subject to the limits of voltage, current and power stated in
the product datasheet.
The metal case of the LEAF Microinverter M500-S does not require grounding.
Grounding is ensured by the dedicated conductor on the AC side, its connection should be performed based on natio-
nal laws for grounding wires
The use of the ground connection of the metal housing, when required by the rules of installation of the photovoltaic
system, must be carried out through the appropriate threaded socket marked with the grounding symbol and located
on one side of the enclosure.
Use the M5 screw supplied by the manufacturer, with a maximum length of 6 mm and with anti-loosening device
(washer) and using a yellow-green cable, with minimum section of 2.5 mm2, assembled with bushing.
The LEAF Microinverter M500-S does not incorporate devices to measure the insulation resistance between the DC
input and ground, consequently it must be installed in accordance to what is described in 5.3.2.11 of CEI EN 62109-2,
which indicates to consult local regulations to determine if additional functions are required or not.
Whenever the PV module is exposed to light, it provides a DC voltage: follow all warnings and safety instructions provi-
ded in the documentation of the module manufacturer.
Energy is supplied by all the active microinverters connected at the time.
The LEAF Microinverter M500-S contains no user-serviceable parts. In case of a repair, it should be returned to the
seller.
Do not connect the LEAF Microinverter M500-S to batteries.
In normal use, the container LEAF Microinverter M500-S can reach high temperatures: install in order to avoid any
contact, even accidental, with the unit.
All circuits branch must be able to carry a maximum current of 16A and must be provided with protection devices of
suitable size in accordance with the regulations in force in the place of installation.
Protection of the AC wiring
An additional protection of the AC wiring coming from the microinverter (which could include residual current devices,
earth leakage controllers and/or switches) must be provided, and may be required under existing national rules on
wiring.
In case of use of a protective device driven by residual current (RCD) or monitoring (RCM) for protection in case of
Before connecting the AC wiring of the photovoltaic system to the grid, local regulation conformity for electrical
systems must be checked carefully.
The AC cable must be connected to the distribution network through the protective equipment dened by local
regulations.
All the parts of the plant must be kept dry before and during installation and connection.
5. REMOVING A LEAF MICROINVERTER M500-S
• Isolate the AC bus of the photovoltaic system from the grid.
• Remove the AC cable from the LEAF M500-S microinverter to be removed
• If present, remove also the AC cable from the distribution unit and one of the supplied caps
• Remove the connectors from the photovoltaic panel to the LEAF M500-S microinverter
Strictly adhere to the connection sequence of LEAF M500-S microinverter, so to prevent parts accessible to the
operator from becoming live.

11
2. GETTING STARTED: ANALYSIS OF THE CLIENT SITE
During the visit to the facilities of the client, ensure that:
• The structure of the customer is capable to support the weight of the photovoltaic installation.
• The client has all the permissions for the construction of the photovoltaic system.
1.4 Compliance requirements of the installation
The installation must be made in accordance with the regulations in force in the place of installation.
The LEAF Microinverter M500-S must always be installed on a branch circuit with an external transient surge suppressor that
must meet the requirements set out in IEC 61643-1 class II.
Where required, a dedicated detaching device must be installed.
4.3 Connecting to the PV panels
The LEAF M500-S microinverters may be connected to 1 or 2 photovoltaic modules, depending on module charateristcs: in the
case of connection to a pair of modules, these must be previously connected in series as shown in gure 4.5.
Plug the DC connectors until the latch.
The DC connectors between the photovoltaic module and the LEAF Microinverter M500-S ìmust not be opened during
operation of the microinverter: ensure that the PV system is disconnected from the AC grid before detaching the DC connectors.
Construction works of the PV system must be carried out carefully following the safety instructions for of the workplace, based
on local regulations.
direct or indirect contact, only RCD or RCM Type B on the supply side of this product can be applied
Voltage drop in the AC wiring.
An excessive length of the AC cables at the output of the microinverter may cause a voltage drop of a value such as to
impair the connection to the distribution network: to ensure the efcient operation of the system, the voltage drop in the
AC wiring harness must be checked through direct measurement (ideal), or through calculations, graphs or tables.
In case of excessive voltage drop, use cables with a larger cross-section.
Installation test, initial inspection
Before connecting to the mains, the wiring must be checked and tested to ensure that the regulatory requirements have
been met.
The type and level of the tests must comply with the local and national rules.
The tests and the interpretation of the results should be conducted by qualied persons.
The LEAF Microinverter M500-S has no user-serviceable parts: do not try to open it or to carry out repairs.
Opening or tampering the LEAF Microinverter M500-S, and all the LEAF accessories, will result in immediate termination
of the guarantee.
In case of fault, contact the installer or the LEAF customer support.
Once xed to the structure of the photovoltaic system, no weights shall be put on top of the LEAF Microinverter M500-S.
In any case, avoid falling objects or weights exceeding 10kg to be placed on top of the microinverter.
6
MICROINVERTER
CONNECTION
MICROINVERTER
CONNECTION
AC BUS EXTENSIONDISTRIBUTION UNITCAP
Fig. 4.4
Fig. 4.5
+
+
+
-
-
+ -
-

7
10
3. LEAF MICROINVERTER M500-S
General information on LEAF M500-S Microinverter: names and functions of the parts.
Messa a terra
M5 Screw
Protective Vent
Robust Venting
PV Input
MC-4 Connector AC Output
Standard RST connector
Backover Slot
Fastening Slot
Backover Hole
Easy Handling
Heatsink
LEAF Design
3.1 Label
The label of the microinverter contains all the useful information for its identication, including the serial number, the release of the
software and the symbols whose meaning is given in the table below.
3.2 Wiring
When a monitoring system is required, the installer shall inform the client about the best suited conguration based on the system
architecture and clients needs.
Each microinverter is an independent production unit, safe and efcient: it can then be installed, monitored and controlled
independently from the others.
The serial number shown on the label is used in the mapping procedure for relating each microinverter with its location in the
plant, so that it can uniquely identied during the phases of conguration and diagnostic: this operation is fundamental for the
proper use of the monitoring system (if any).
Caution hot surface: do not touch.
Read the instructions before to use and to install.
Risk of electric shock. Presence of dangerous voltage inside the enclosure.
Realize the connections as shown in gure 4.2.
Inspection Box
4.2.1 Connection without WIELAND distribution units
Each distribution unit can accommodate a maximum of 4 connection cables: up to 3 AC lines from microinverters and up to 2
cables for connecting to the distribution network.
As depicted in g.4.3 and 4.4, several arrangements are possible when more distributors are in use.
4.2.2 Connection with WIELAND distribution unit
Fig. 3.1
Fig. 3.2
Fig. 4.2
Fig. 4.3
Always use the supplied cap to close the unused connection points on the AC distribution units.
Inspection Box
LE-1615A-0000000200-C-52010-11
Serial Number

9
8
The LEAF M500-S microinverter is equipped with polarized MC4 connectors for connection to the photovoltaic panels: be,
anyway, careful not to reverse the polarity at this stage.
After connecting the photovoltaic module, the production of electric energy by the LEAF M500-S microinverter will begin only
once the AC line will be connected too.
See p.12, Connecting the AC distribution network (Grid)
Strictly adhere to the connection sequence of LEAF M500-S microinverter, so to prevent parts accessible to the
operator from becoming live.
Before connecting the AC wiring of the photovoltaic system to the grid, local regulation conformity of electrical
systems must be checked carefully.
The AC cable must be connected to the distribution network through the protective equipment dened by local
regulations.
WARNING: If exposed to sunlight, the solar modules will always exhibit DC voltage at their electrical terminals.
Carefully avoid contact between the cables and the surface of the roof: when necessary, arrange the cable along the
frame, securing it carefully by means of cable ties.
Strictly adhere to the connection sequence of LEAF M500-S microinverter, so to prevent parts accessible to the
operator from becoming live.
The system must be operated only once all the connections have been arranged. Never turn on the systems while
partially connected, this to avoid the risk of dangerous voltages in parts accessible to the operator.
4. MOUNTING THE LEAF MICROINVERTER M500-S
4.1 Fixing LEAF Microinverter M500-S
Ensure the AC wiring of the PV is disconnected from the grid.
All the parts of the plant must be kept dry before and during installation and connection.
The maximum number of LEAF M500-S microinverters that can be installed on a single AC circuit branch depends
on the maximum output current of each inverter and on the maximum permissible current of that branch.
4.2 Connecting the AC BUS
The connection of the LEAF M500-S microinverters to the photovoltaic system must be performed carefully respecting the
following sequence of operations:
• Connecting the AC bus of the PV system at all the LEAF M500-S microinverters
• Connecting all the LEAF M500-S microinverters to their respective panel or to the pair of solar panels associated with it
• Connecting the AC bus of the PV system to the grid
Make sure the bolts used are noticeable on the backsheet of the module, even in conditions of snow load on the module.
Secure the inverter to the mounting structure.
The assembly methods may vary.
The AC connector of the microinverter has to be connected to the main electrical network by means of a 3-poles wire, with a
yellow-green grounding conductor of section equal to the others’ and never below 1.5 mm2.
The AC bus of the photovoltaic system can be realized with any number of radial derivations, up to the maximum number of
inverters provided: all the AC leads, from the various derivations, must be brought together near the point where the plant is
connected to the AC network distribution using an appropriate junction box.
Depending on the needs, there are different types of connection:
1. Without use of the distribution unit
2. With Use of the Distribution Unit
Fig. 4.1
The removal of one or more LEAF M500-S microinverter does not compromise the functionality and the efciency of the
remaining part of the system
In order to facilitate monitoring and consequent support, the installer must provide the map of the installation as described in
Appendix (pag.14), reporting the serial numbers of micro-inverter used.
After installing the frame on which the solar panels are placed and after preparing the duct of the AC line, microinverters can be
xed in the desired locations as described in chapter 4.

9
8
The LEAF M500-S microinverter is equipped with polarized MC4 connectors for connection to the photovoltaic panels: be,
anyway, careful not to reverse the polarity at this stage.
After connecting the photovoltaic module, the production of electric energy by the LEAF M500-S microinverter will begin only
once the AC line will be connected too.
See p.12, Connecting the AC distribution network (Grid)
Strictly adhere to the connection sequence of LEAF M500-S microinverter, so to prevent parts accessible to the
operator from becoming live.
Before connecting the AC wiring of the photovoltaic system to the grid, local regulation conformity of electrical
systems must be checked carefully.
The AC cable must be connected to the distribution network through the protective equipment dened by local
regulations.
WARNING: If exposed to sunlight, the solar modules will always exhibit DC voltage at their electrical terminals.
Carefully avoid contact between the cables and the surface of the roof: when necessary, arrange the cable along the
frame, securing it carefully by means of cable ties.
Strictly adhere to the connection sequence of LEAF M500-S microinverter, so to prevent parts accessible to the
operator from becoming live.
The system must be operated only once all the connections have been arranged. Never turn on the systems while
partially connected, this to avoid the risk of dangerous voltages in parts accessible to the operator.
4. MOUNTING THE LEAF MICROINVERTER M500-S
4.1 Fixing LEAF Microinverter M500-S
Ensure the AC wiring of the PV is disconnected from the grid.
All the parts of the plant must be kept dry before and during installation and connection.
The maximum number of LEAF M500-S microinverters that can be installed on a single AC circuit branch depends
on the maximum output current of each inverter and on the maximum permissible current of that branch.
4.2 Connecting the AC BUS
The connection of the LEAF M500-S microinverters to the photovoltaic system must be performed carefully respecting the
following sequence of operations:
• Connecting the AC bus of the PV system at all the LEAF M500-S microinverters
• Connecting all the LEAF M500-S microinverters to their respective panel or to the pair of solar panels associated with it
• Connecting the AC bus of the PV system to the grid
Make sure the bolts used are noticeable on the backsheet of the module, even in conditions of snow load on the module.
Secure the inverter to the mounting structure.
The assembly methods may vary.
The AC connector of the microinverter has to be connected to the main electrical network by means of a 3-poles wire, with a
yellow-green grounding conductor of section equal to the others’ and never below 1.5 mm2.
The AC bus of the photovoltaic system can be realized with any number of radial derivations, up to the maximum number of
inverters provided: all the AC leads, from the various derivations, must be brought together near the point where the plant is
connected to the AC network distribution using an appropriate junction box.
Depending on the needs, there are different types of connection:
1. Without use of the distribution unit
2. With Use of the Distribution Unit
Fig. 4.1
The removal of one or more LEAF M500-S microinverter does not compromise the functionality and the efciency of the
remaining part of the system
In order to facilitate monitoring and consequent support, the installer must provide the map of the installation as described in
Appendix (pag.14), reporting the serial numbers of micro-inverter used.
After installing the frame on which the solar panels are placed and after preparing the duct of the AC line, microinverters can be
xed in the desired locations as described in chapter 4.

7
10
3. LEAF MICROINVERTER M500-S
General information on LEAF M500-S Microinverter: names and functions of the parts.
Messa a terra
M5 Screw
Protective Vent
Robust Venting
PV Input
MC-4 Connector AC Output
Standard RST connector
Backover Slot
Fastening Slot
Backover Hole
Easy Handling
Heatsink
LEAF Design
3.1 Label
The label of the microinverter contains all the useful information for its identication, including the serial number, the release of the
software and the symbols whose meaning is given in the table below.
3.2 Wiring
When a monitoring system is required, the installer shall inform the client about the best suited conguration based on the system
architecture and clients needs.
Each microinverter is an independent production unit, safe and efcient: it can then be installed, monitored and controlled
independently from the others.
The serial number shown on the label is used in the mapping procedure for relating each microinverter with its location in the
plant, so that it can uniquely identied during the phases of conguration and diagnostic: this operation is fundamental for the
proper use of the monitoring system (if any).
Caution hot surface: do not touch.
Read the instructions before to use and to install.
Risk of electric shock. Presence of dangerous voltage inside the enclosure.
Realize the connections as shown in gure 4.2.
Inspection Box
4.2.1 Connection without WIELAND distribution units
Each distribution unit can accommodate a maximum of 4 connection cables: up to 3 AC lines from microinverters and up to 2
cables for connecting to the distribution network.
As depicted in g.4.3 and 4.4, several arrangements are possible when more distributors are in use.
4.2.2 Connection with WIELAND distribution unit
Fig. 3.1
Fig. 3.2
Fig. 4.2
Fig. 4.3
Always use the supplied cap to close the unused connection points on the AC distribution units.
Inspection Box
LE-1615A-0000000200-C-52010-11
Serial Number

11
2. GETTING STARTED: ANALYSIS OF THE CLIENT SITE
During the visit to the facilities of the client, ensure that:
• The structure of the customer is capable to support the weight of the photovoltaic installation.
• The client has all the permissions for the construction of the photovoltaic system.
1.4 Compliance requirements of the installation
The installation must be made in accordance with the regulations in force in the place of installation.
The LEAF Microinverter M500-S must always be installed on a branch circuit with an external transient surge suppressor that
must meet the requirements set out in IEC 61643-1 class II.
Where required, a dedicated detaching device must be installed.
4.3 Connecting to the PV panels
The LEAF M500-S microinverters may be connected to 1 or 2 photovoltaic modules, depending on module charateristcs: in the
case of connection to a pair of modules, these must be previously connected in series as shown in gure 4.5.
Plug the DC connectors until the latch.
The DC connectors between the photovoltaic module and the LEAF Microinverter M500-S ìmust not be opened during
operation of the microinverter: ensure that the PV system is disconnected from the AC grid before detaching the DC connectors.
Construction works of the PV system must be carried out carefully following the safety instructions for of the workplace, based
on local regulations.
direct or indirect contact, only RCD or RCM Type B on the supply side of this product can be applied
Voltage drop in the AC wiring.
An excessive length of the AC cables at the output of the microinverter may cause a voltage drop of a value such as to
impair the connection to the distribution network: to ensure the efcient operation of the system, the voltage drop in the
AC wiring harness must be checked through direct measurement (ideal), or through calculations, graphs or tables.
In case of excessive voltage drop, use cables with a larger cross-section.
Installation test, initial inspection
Before connecting to the mains, the wiring must be checked and tested to ensure that the regulatory requirements have
been met.
The type and level of the tests must comply with the local and national rules.
The tests and the interpretation of the results should be conducted by qualied persons.
The LEAF Microinverter M500-S has no user-serviceable parts: do not try to open it or to carry out repairs.
Opening or tampering the LEAF Microinverter M500-S, and all the LEAF accessories, will result in immediate termination
of the guarantee.
In case of fault, contact the installer or the LEAF customer support.
Once xed to the structure of the photovoltaic system, no weights shall be put on top of the LEAF Microinverter M500-S.
In any case, avoid falling objects or weights exceeding 10kg to be placed on top of the microinverter.
6
MICROINVERTER
CONNECTION
MICROINVERTER
CONNECTION
AC BUS EXTENSIONDISTRIBUTION UNITCAP
Fig. 4.4
Fig. 4.5
+
+
+
-
-
+ -
-

4.4 Connecting the AC distribution network (Grid)
5
After verifying the correct performance and functioning of all the parts of the PV system, the connection to the AC grid can be
established, with all the protection devices in place.
12
switches), so to allow safe inspection, detection of any faults, testing and maintenance operations.
Never disconnect a LEAF Microinverter M500-S or any part of the photovoltaic system without having previously exclu-
ded the AC distribution network.
Never disconnect the terminals from the PV panel during the operation of the LEAF Microinverter M500-S. To
disconnect a microinverter from the plant do the following:
• From the power distribution system, detach the section where there is the microinverter to disconnect
• Remove the PV connectors
• Remove the AC plug
All LEAF microinverters and the metallic elements of the system must always be connected to ground in accordance
with local and national electrical standards.
If the LEAF microinverter, or any accessory described herein, shows any of the following characteristics, remove it from
the plant following the instructions, and contact your distributor or installer:
• The power cables appear damaged.
• You suspect that liquid has penetrated into the product.
• The product was exposed to heavy rain or water.
• The product does not operate properly.
• The product has been dropped or has suffered any damage.
• There are noticeable signs of overheating.
The aluminum body of the LEAF Microinverter M500-S serves as a heatsink and can reach high temperatures, therefore
it should not be touched during operation.
The proper functioning of the LEAF Microinverter M500-S is subject to the limits of voltage, current and power stated in
the product datasheet.
The metal case of the LEAF Microinverter M500-S does not require grounding.
Grounding is ensured by the dedicated conductor on the AC side, its connection should be performed based on natio-
nal laws for grounding wires
The use of the ground connection of the metal housing, when required by the rules of installation of the photovoltaic
system, must be carried out through the appropriate threaded socket marked with the grounding symbol and located
on one side of the enclosure.
Use the M5 screw supplied by the manufacturer, with a maximum length of 6 mm and with anti-loosening device
(washer) and using a yellow-green cable, with minimum section of 2.5 mm2, assembled with bushing.
The LEAF Microinverter M500-S does not incorporate devices to measure the insulation resistance between the DC
input and ground, consequently it must be installed in accordance to what is described in 5.3.2.11 of CEI EN 62109-2,
which indicates to consult local regulations to determine if additional functions are required or not.
Whenever the PV module is exposed to light, it provides a DC voltage: follow all warnings and safety instructions provi-
ded in the documentation of the module manufacturer.
Energy is supplied by all the active microinverters connected at the time.
The LEAF Microinverter M500-S contains no user-serviceable parts. In case of a repair, it should be returned to the
seller.
Do not connect the LEAF Microinverter M500-S to batteries.
In normal use, the container LEAF Microinverter M500-S can reach high temperatures: install in order to avoid any
contact, even accidental, with the unit.
All circuits branch must be able to carry a maximum current of 16A and must be provided with protection devices of
suitable size in accordance with the regulations in force in the place of installation.
Protection of the AC wiring
An additional protection of the AC wiring coming from the microinverter (which could include residual current devices,
earth leakage controllers and/or switches) must be provided, and may be required under existing national rules on
wiring.
In case of use of a protective device driven by residual current (RCD) or monitoring (RCM) for protection in case of
Before connecting the AC wiring of the photovoltaic system to the grid, local regulation conformity for electrical
systems must be checked carefully.
The AC cable must be connected to the distribution network through the protective equipment dened by local
regulations.
All the parts of the plant must be kept dry before and during installation and connection.
5. REMOVING A LEAF MICROINVERTER M500-S
• Isolate the AC bus of the photovoltaic system from the grid.
• Remove the AC cable from the LEAF M500-S microinverter to be removed
• If present, remove also the AC cable from the distribution unit and one of the supplied caps
• Remove the connectors from the photovoltaic panel to the LEAF M500-S microinverter
Strictly adhere to the connection sequence of LEAF M500-S microinverter, so to prevent parts accessible to the
operator from becoming live.

1. INTRODUCTION
1.1 Recipients
13
4
LEAF Spa reserves the right to change the information in this manual without notice: check the website www.leaf-eng.com for
latest updates.
Please retain a copy of this manual for future reference.
This manual is intended for professional installers and personnel responsible for the installation and commissioning of the
photovoltaic system.
Installation and maintenance personnel of the photovoltaic system should be trained to specic regulations of the country in
which the plant is realized and should be aware of all the security procedures provided by law.
1.3 Safety notes
The LEAF Microinverter M500-S is equipped with an isolation transformer between the PV side and the grid network, with
insulation of reinforced type.
Before installing and using any LEAF Microinverter M500-S, be sure to have read and fully understood the instructions provided
in this manual.
1.2 Conventions used in this manual
This manual uses the following symbols and conventions, which should be noted and followed scrupulously.
DANGER
Indicating unsafe practices that could result in death or serious injury if not performed correctly.
WARNING
It is used to indicate operations that may affect the proper functioning of the device.
HOT SURFACE
It indicates operations that may cause burns and serious damage in case of contact with hot surfaces.
NOTE
It is used to highlight particular requirements of the installation process.
Technical Details of LEAF Microinverter 500-S
Environmental category: Outdoor Use
Pollution Degree: Pollution Degree 3
Degree of protection: IP65
Ambient temperature range of -40 ° C to +65 ° C
Relative Humidity 4% to 100%
Overvoltage category - side DC input: Overvoltage II
Overvoltage category - side AC output: Overvoltage III
Do not use the LEAF Microinverter M500-S in a manner not specied by the manufacturer.
Carefully read the instructions in this manual before proceeding with the installation of the LEAF Microinverter M500-S
and the PV system.
The DC leads of the photovoltaic system are not connected to the ground and may be energized.
The installation and/or replacement of LEAF Microinverter M500-S should be performed only by qualied personnel.
All parts of the PV system must be implemented in compliance with local and national regulations on electrical systems.
All parts of the plant must be kept dry before and during the connection and the installation.
Lightning Protection
To avoid voltages induced by lightning, the wiring of the PV must be placed as a derivation of radial or single type: Do
not use closed loop electrical circuits, which could trigger unwanted antenna effects.
According to local and national standards, additional active protections against lightning strikes may be required
Insulation of the AC wiring
The AC wiring coming from the microinverter must ensure electrical isolation from the mains (for example by means of
APPENDIX
4.4 Connecting the AC distribution network (Grid)
5
After verifying the correct performance and functioning of all the parts of the PV system, the connection to the AC grid can be
established, with all the protection devices in place.
12
switches), so to allow safe inspection, detection of any faults, testing and maintenance operations.
Never disconnect a LEAF Microinverter M500-S or any part of the photovoltaic system without having previously exclu-
ded the AC distribution network.
Never disconnect the terminals from the PV panel during the operation of the LEAF Microinverter M500-S. To
disconnect a microinverter from the plant do the following:
• From the power distribution system, detach the section where there is the microinverter to disconnect
• Remove the PV connectors
• Remove the AC plug
All LEAF microinverters and the metallic elements of the system must always be connected to ground in accordance
with local and national electrical standards.
If the LEAF microinverter, or any accessory described herein, shows any of the following characteristics, remove it from
the plant following the instructions, and contact your distributor or installer:
• The power cables appear damaged.
• You suspect that liquid has penetrated into the product.
• The product was exposed to heavy rain or water.
• The product does not operate properly.
• The product has been dropped or has suffered any damage.
• There are noticeable signs of overheating.
The aluminum body of the LEAF Microinverter M500-S serves as a heatsink and can reach high temperatures, therefore
it should not be touched during operation.
The proper functioning of the LEAF Microinverter M500-S is subject to the limits of voltage, current and power stated in
the product datasheet.
The metal case of the LEAF Microinverter M500-S does not require grounding.
Grounding is ensured by the dedicated conductor on the AC side, its connection should be performed based on natio-
nal laws for grounding wires
The use of the ground connection of the metal housing, when required by the rules of installation of the photovoltaic
system, must be carried out through the appropriate threaded socket marked with the grounding symbol and located
on one side of the enclosure.
Use the M5 screw supplied by the manufacturer, with a maximum length of 6 mm and with anti-loosening device
(washer) and using a yellow-green cable, with minimum section of 2.5 mm2, assembled with bushing.
The LEAF Microinverter M500-S does not incorporate devices to measure the insulation resistance between the DC
input and ground, consequently it must be installed in accordance to what is described in 5.3.2.11 of CEI EN 62109-2,
which indicates to consult local regulations to determine if additional functions are required or not.
Whenever the PV module is exposed to light, it provides a DC voltage: follow all warnings and safety instructions provi-
ded in the documentation of the module manufacturer.
Energy is supplied by all the active microinverters connected at the time.
The LEAF Microinverter M500-S contains no user-serviceable parts. In case of a repair, it should be returned to the
seller.
Do not connect the LEAF Microinverter M500-S to batteries.
In normal use, the container LEAF Microinverter M500-S can reach high temperatures: install in order to avoid any
contact, even accidental, with the unit.
All circuits branch must be able to carry a maximum current of 16A and must be provided with protection devices of
suitable size in accordance with the regulations in force in the place of installation.
Protection of the AC wiring
An additional protection of the AC wiring coming from the microinverter (which could include residual current devices,
earth leakage controllers and/or switches) must be provided, and may be required under existing national rules on
wiring.
In case of use of a protective device driven by residual current (RCD) or monitoring (RCM) for protection in case of
Before connecting the AC wiring of the photovoltaic system to the grid, local regulation conformity for electrical
systems must be checked carefully.
The AC cable must be connected to the distribution network through the protective equipment dened by local
regulations.
All the parts of the plant must be kept dry before and during installation and connection.
5. REMOVING A LEAF MICROINVERTER M500-S
• Isolate the AC bus of the photovoltaic system from the grid.
• Remove the AC cable from the LEAF M500-S microinverter to be removed
• If present, remove also the AC cable from the distribution unit and one of the supplied caps
• Remove the connectors from the photovoltaic panel to the LEAF M500-S microinverter
Strictly adhere to the connection sequence of LEAF M500-S microinverter, so to prevent parts accessible to the
operator from becoming live.

INDEX
1. INTRODUCTION 4
3
INSTALLATION MAP
1.1 Recipients
1.2 Conventions used in this manual
1.3 Safety notes
1.4 Compliance requirements of the installation
CLIENT DATA INSTALLER DATA
ORIENTATION
(Insert geographical orientation and roof slope)
Company:
4
4
4
6
4. MOUNTING THE LEAF MICROINVERTER M500-S 9
4.1 Fixing LEAF Microinverter M500-S
4.2 Connecting the AC BUS
4.2.1 Connection without WIELAND distribution units
4.2.2 Connection with WIELAND distribution unit
4.3 Connecting to the PV panels
4.4 Connecting the AC distribution network (Grid)
9
9
10
10
11
12
3. LEAF MICROINVERTER M500-S 7
3.1 Label
3.2 Wiring
Roof section N. ___
7
7
APPENDIX 13
Technical Details of LEAF Microinverter M500-S
Installation Map
13
14
2. GETTING STARTED: ANALYSIS OF THE CLIENT SITE 6
5. REMOVING A LEAF MICROINVERTER M500-S 12
14
Address:
City:
Company:
Address:
City:

MICROINVERTER M500-S
November 2014
Copyright LEAF SpA
TECHNICAL DATA
DC Input
Recommended PV Input Power (STC)
500 ... 560 Wp
Input Voltage Upper Limit (Max) 90 V
Starting Voltage (Min) 40 V
Operative Voltage Range (Min-Max) 20 … 85 V
MPP Voltage Range (Min-Max) 30 … 75 V
Input Current (Max) 11 A
Internal Output Transient-Overvoltage Protection
Yes
AC Output
Active Output Power (Max) 460 W
AC Grid Connection and Nominal Voltage 1N/PE AC 230 V
Output Current (Max) 2.0 A
Nominal Frequency 50 Hz
Power Factor Range 0.90 capacitive … 0.90 inductive
Reactive Power Control Range -48.3% … +48.3% nominal power
Low Voltage Fault Ride Through (LVFRT) Yes
Max Output Fault Current 5.6 A
Internal Input Transient-Overvoltage Protection
Yes
Max Units per Branch Circuit 9/15 for 20/32A breaker
96%
94%
99%
Mechanical Data
Dimensions (W x H x D)
253 x 48 x 247 mm
Weight
2.4 kg
Ambient Temperature Range -40 … +65 °C
Cooling Natural convection
Degree of protection (EN 60529)
IP65
Electrical Safety Class Class I
Topology
High frequency isolation transformer
Connectors
DC Input: MC-4/AC Output: Wieland RST20I3S
PV-Modules Compatibility
2 x 60 Cells (series), 1 x 72 Celles
Norms & Standards CE, CEI 0-21, CEI 0-16, EN 62109-1, EN 62109-2,
VDE-AR-N 4105, VDE 0126-1-1
Communication
Power Line Communication (P.L.C.)
Warranty 20 years

MICROINVERTER M500-S
Installation Manual
Venetronic is the electronics division of VeNetWork spa, a company founded by a
group of 42 business owners from across Italy’s Veneto region. The Company is
headquartered in the Veneto and has operations in 85 countries across the globe.
The mission of VeNetWork is to promote business culture via the funding and
development of new manufacturing companies and service providers that will
generate economic, professional and cultural value for the area.
www.venetronic.it - [email protected]
LEAF SpA
Via Forgaria, 7 - Z.I. Ponterosso
33078 San Vito al Tagliamento (PN) Italy
Tel. [phone]
www.leaf-eng.com - [email protected]