Darfon G640 User manual

G640
MICRO
INVERTER
USER MANUAL

G640 Micro Inverter User Manual
G640 UM draft v1 20180928 © 2018 Darfon Electronics Corp. p. 2 / 19
TABLE OF CONTENTS
IMPORTANT SAFETY INSTRUCTIONS ...................................................................... 3
SAFETY INSTRUCTIONS .................................................................................................3
SURGE SUPPRESSION ...................................................................................................3
FCC COMPLIANCE ......................................................................................................4
OTHER INFORMATION..................................................................................................4
PRE-INSTALLATION ................................................................................................ 5
THE MICRO INVERTER .................................................................................................5
PV SYSTEM LAYOU T ....................................................................................................5
PARTS AND TOOLS.......................................................................................................5
COMPATIBILITY AND CAPACITY .......................................................................................5
AC TRUNK CABLE .......................................................................................................6
GROUNDING OPTIONS ................................................................................................. 6
MICRO INVERTER LAYOU T ............................................................................................7
SURGE PROTECTION ....................................................................................................7
INSTALLING THE MICRO INVERTER......................................................................... 8
INSTALLING ONTO A PV RACKING SYSTEM ........................................................................8
POST-INSTALLATION ............................................................................................ 10
COMMISSIONING AND OPERATING ...............................................................................10
GFDI FAULT ............................................................................................................10
DISCONNECTING A MICRO INVERTER.............................................................................10
MONITORING SYSTEM......................................................................................... 11
PLC BOX OVERVIEW .................................................................................................11
DATA LOGGER OVERVIEW ...........................................................................................11
INSTALLING THE PLC BOX AND DATA LOGGER .................................................................12
REGISTERING THE PV SYSTEM .......................................... ERROR!BOOKMARK NOT DEFINED.
TROUBLESHOOTING ............................................................................................ 14
TROUBLESHOOTING THE MICRO INVERTER .....................................................................14
TROUBLESHOOTING THE PLC BOX ................................................................................14
TROUBLESHOOTING THE DATA LOGGER..........................................................................15
EQUIPMENT AND PARTS..................................... ERROR! BOOKMARK NOT DEFINED.
TECHNICAL SPECIFICATIONS ................................................................................ 16
MICRO INVERTER......................................................................................................16
PLC BOX ................................................................................................................16
DATA LOGGER ..........................................................................................................16
SAMPLE WIRING.................................................................................................. 17
240V 1Φ...............................................................................................................17
INSTALLATION MAP TEMPLATE .......................................................................... 181
NOTES ............................................................................................................... 192

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IMPORTANT SAFETY INSTRUCTIONS
Safety Instructions
PLEASE READ THESE INSTRUCTIONS BEFORE INSTALLING ANY PRODUCTS OR
DEVICES & KEEP FOR FUTURE REFERENCE.
This manual contains important instructions for the installation and maintenance
of G640 micro inverters. Before installing, please read these safety instructions
carefully. Take special care to follow the warnings indicated on the unit itself as
well as the safety instructions listed below.
Safety Symbols
To reduce the risk of injury and to ensure the continued safe operation of this
product, the following safety instructions and warnings are marked in this
manual.
WARNING
This indicates the risk of electric
shock. The presence of high
voltage levels may constitute a
risk of injury or death to users and/or installers.
CAUTION
This indicates important
information where failure to
comply may result in safety
hazards or cause damage to this product.
Safety Instructions
•Read all instructions and cautionary marks in the manual carefully before
starting the installation.
•Do not attempt to repair this product; it does not contain user-serviceable
parts. Repairs and internal servicing should only be performed by authorized
service personnel.
•Do not tamper with or open this product. Opening this product may result in
electric shock.
•Perform all electrical installations in accordance with all applicable local
electrical codes and the National Electrical Code (NEC), ANSI/NFPA 70.
•Only qualified electrical personnel should perform the electrical installation and
wiring of this product.
•Be aware that even without an external voltage source connected, the micro
inverter may contain high voltages and there is a risk of electrical shock.
•Connect the micro inverter to the utility grid only after receiving prior approval
from the electrical utility company.
•The temperature of the heat sinks outside of the device can reach over 85°C in
normal operation. To reduce risk of burns, use caution when working with
micro inverters.
•Do not disconnect the DC power source from the micro inverter without first
disconnecting the AC power source. Both AC and DC power sources must be
disconnected before servicing. Be aware that DC power/voltage is generated
when the photovoltaic array is exposed to light.
•Switch off the circuit breakers before installation and wirings.
•For the safety of installation, remove all conductive jewelry or equipment
during the installation or service of the device parts, connector and/or wiring.
•Do not stand on a wet location while doing installation and wirings. Enclose the
outer covering well before switch on the circuit breakers.
•The micro inverters should be installed as instructed in this manual. Failure to
comply with these precautions or with specific warnings elsewhere in this
manual violates safety standards of design, manufacture, and intended use of
the device. The manufacturer assumes no liability for the customer’s failure to
comply with these requirements.
•When a GFDI fault (Ground fault) occurs, the LED will flash in red light. Please
refer to the POST-INSTALLATION section for more introductions.
Surge Suppression
Lightning does not actually need to strike the equipment or building where the
PV system is installed to cause damage. Often, a strike nearby will induce voltage
spikes in the electrical grid that can damage equipment. Artificial spikes such as
those induced by electric motors starting up can also cause damages to the
equipment.
The micro inverters have integrated surge protection built-in; however, if the
surge has sufficient energy, the built-in protection in the device would be
exceeded and the device could potentially be damaged. Therefore, external surge
protection MUST be installed as part of any solar installation.
WARNING
When installing a surge protection device (SPD), one MUST follow the original
manufacturer’
s instructions on how to install the SPD properly. Incorrect
installation of the SPD may still cause damages to the micro inverters. If the
installation site is known for unstable or heavy surges, then it is the
responsibility of the installer to make sure the SPD chosen can adequately
protect the micro inverters.

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The following SPD specification is the minimum protection level that is required
to adequately protect the micro inverter from surges that may be encountered in
ordinary 220-240V single phase residential environment.
PARAMETERS
SYM
SPEC
Nominal discharge current (IEC/UL)
15 impulses x 8/20 μs
In30 kA / 20 kA
Maximum discharge current
1 impulse x 8/20 μs
Imax 70 kA
Short-circuit current rating
Sccr
100 kA
Protection level at In
Up-In
1.4 kV
Protection level at 10 kA
1.0 kV
Voltage protection rating
Vpr
1,000 V
Operating current
Ic
< 1 mA
IEC 61643-11: International compliance
Low Voltage SPD - Class II Test
UL 1449 3rd Edition: USA compliance
Type 4, for use in Type 2 Locations
Surge protection devices with protection levels higher than the specification
shown above can be used if necessary. Please consult your local electrician or
surge protection expert on appropriate surge protection for your property.
For convenience, the following SPDs, which have been tested to ensure that they
do not interfere with power line communications, may be used.
JDA D1-80/xxx-VG-R series
http://www.jdauspice.com/uploads/2011-01/10/SPD_catalogue.pdf
Citel MSB10-400
http://www.citel.fr/userfiles/medias/Datasheet/fiche_anglaise/MSB10-UL__A
_F141103A.pdf
FCC Compliance
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, you are
encouraged to try to correct the interference by one or more of the following
measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and the receiver.
•Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
•Consult the dealer or an experienced radio/TV technician for help.
Changes or modifications not expressly approved by the party responsible for
compliance may void the user’s authority to operate the equipment.
Other Information
Product information is subject to change without notice. All trademarks are
recognized as the property of their respective owners.

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PRE-INSTALLATION
Thank you for choosing G640 micro inverter as a key component to your solar
power system. Review and follow the instructions in this section before installing
G640 micro inverters.
The Micro Inverter
PV System Layout
The optimal PV array layout will need to be planned before installation. The
layout/plan will affect the wiring and cabling schemes and will need to be
adjusted accordingly. The layout will also need to account for the constraints of
the distance between each PV module due to the connectors on the trunk cable
and the distance between the micro inverters and PLC box.
•The maximum cable distance from the PLC box to the farthest G640 is 50
meters (164 feet).
•It is ideal to tap power from the center of the circuit, so 2 segments of 9 and 10
modules (total 19) for each circuit. This maximizes the communication signal
strength to the PLC box.
•The use of a RS485 specific cable is recommended, such as Belden 3105A;
however, any twisted pair cable can be used, such as CAT5, with some
degradation of signal and distance.
Parts and Tools
This section provides a list of equipment and tools needed for installing and
setting up the PV system. Please refer to the Equipment and Parts section for
components associated with the micro inverter.
Equipment for Micro Inverter Installation
•Sealing caps (for unused connectors)
•AC trunk cable
•AC connector removal tool
•End Caps (used at the end of AC cable)
Equipment for Monitoring System Installation
•Data Logger (Includes AC Adapter, RS485 Connector, Wall-Mounted Frame
and Ethernet Cable)
•PLC Box (Includes RS485 Connector)
•Red/Black Wiring for RS485
Other Tools/Equipment
•Outdoor-rated AC junction box(es)
•Cable clips and/or tie wraps
•Gland/strain relief fittings (on per AC junction box)
•Torque wrench & sockets for mounting hardware
•Adjustable/open-ended wrench (for end caps)
Compatibility and Capacity
G640 micro inverters are electrically compatible with PV modules that have a
voltage range of 24V to 60V and a maximum wattage of 350W although 320
watts is considered optimal. Please refer to the ‘Compatible PV Module
Calculator’ on the website at www.darfonsolar.com to verify the PV module is

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electrically compatible.
Before ordering the PV module, make sure the connector type is compatible with
the micro inverter.
Electrical Compatibility
Model
PV MPPT Voltage Range
PV Module Connector Type
G640
24V to 45V
MC4 Locking
[Male-Anode (+), Female-Cathode (-)]
Voltage and Capacity
AC Trunk Cable
Overcurrent Protection
240V (Single Phase)
12AWG
20Amp Breaker
6 MI
WARNING
DO NOT exceed the maximum
number of micro inverters in
an AC branch circuit as listed above.
CAUTION
Each AC branch circuit must be
protected by a dedicated circuit
breaker of 20A or less if using 12 AWG trunk
cable.
AC Trunk Cable
Depending on the orientation of the installation, the AC trunk cable can be in
portrait or landscape format.
Pin
Wire color
Wire Usage
1
Black
L1
2
Red
L2
3
Green
Ground
Grounding Options
Option 1: Integrated Grounding
Integrated grounding eliminates the need to install Grounding Electrode
Conductor (GEC) to each G640 by completely isolating the internal DC circuit
from the AC circuit and ground. DC ground faults are detected on either the
positive and/or negative conductors of the DC circuit by a Ground Fault Detection
Interrupter Insulation Monitor (GFDI IM). If the GFDI IM detects a ground fault
has occurred to the PV input, the micro inverter will automatically disconnect all
conductors and cease supplying output power. In accordance with NEC 690.35,
installers can build ungrounded arrays where only an Equipment Grounding
Conductor (EGC) is required to connect or bond non-current carrying metal
equipment together. The EGC grounding process is completed via the grounding
connection of G640 3-wire AC cable. The PV module will still need to be
grounded according to the module manufacturer’s instructions.
Option 2: GEC Grounding
Although the G640 offers integrated grounding (UL 1741 certified), it also comes
with a grounding terminal clip for any localities that do not accept integrated
grounding. The micro inverter manufacturer will not be held responsible for
improper installations that do not have local AHJ and/or Utility operational
approval.
As indicated in the diagram below, the array GEC can be installed either in series
or in parallel.

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Micro Inverter Layout
Using the installation map template in this manual, draw out the layout of the
array and have it readily available during the installation of the micro inverters to
record micro inverter location.
Draw the layout of the solar panels in the installation map template like the
sample image shown below. When a micro inverter is fastened in its position,
then the secondary serial number sticker on the DC side can be peeled off the
micro inverter and adhered to the installation map template where the actual
position on the roof would correspond to the same panel on the layout drawing.
Note: Tracking micro inverter location by serial number is key for data monitoring
and warranty servicing.
Surge Protection
The micro inverters have integral surge protection built-in; however, if the surge
has sufficient energy, the built-in protection in the device would be exceeded and
the device could potentially be damaged. Therefore, external surge protection
MUST be installed as part of any solar installation.
Please refer to the “Surge Suppression” section on pages 2 and 3 on
specifications for appropriate surge protection.

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INSTALLING THE MICRO INVERTER
The following sections list steps on how to install the G320 micro inverter onto
standard PV racking.
Installing onto a PV Racking System
Step 1: Measure the AC Service at the Site
Measure service entrance conductors to
confirm AC service at the site. Verify the AC
voltages at the electrical utility connection and at the junction box for each AC
branch circuit are within the ranges.
Step 2: Install the AC Branch Circuit Junction Box
2.1.Mount the adapter plate to a
suitable location on the PV
racking system (typically at the
end of a row of modules). The
adapter plate must be installed
with an appropriate junction
box.
2.2.Connect the open wire end of the AC
interconnect cable into the junction
box using an appropriate gland or
strain relief fitting. The AC
interconnect cable requires a strain
relief connector with an opening of
3/8 inches in diameter.
Step 3: Lay Out the AC Trunk Cable
Place the AC trunk cable at the required location. Align the connector to the
position where the micro inverter will be installed. Then secure the cable on
either side of the rack using cable clips or tie wraps.
Note the G640 is the micro inverter of the input of two photovoltaic panels.
Please pay attention to fix the G640 in the middle of two photovoltaic modules
when wiring.
Step 4: Attach the Micro Inverter to the PV Racking
4.1. Note the approximate centers of each PV module on the PV racking.
4.2. Evaluate the location of the micro inverter against potential collection of
moisture or water.
4.3. Evaluate the location of the micro inverter with respect to the DC junction
box and the PV module frame.
4.4. Align the G640 so that the holes on the mounting bracket are above the slot
opening on the PV racking and secure the micro inverter to the PV racking
with screws.
CAUTION Ensure that the inverter does not obstruct the PV module frame or
stiffening braces. Ensure the micro inverter’s AC connector can easily reach the
AC trunk cable.
Step 5: Ground the Micro Inverters
[Option 1]: Integrated Grounding. Go to step 6. No additional grounding is
needed.
[Option 2]: GEC Grounding. Unscrew the top of grounding clips on the micro
inverters. Run the grounding electrode conductor to each grounding clip on the
Wire Connection
240V (Single Phase)
L1 to L2
193 to 242VAC

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micro inverter and then to the junction box. After laying out the grounding
conductor, secure the top of the grounding clips back onto the micro inverters.
WARNING
Correct AC grounding and short circuit protection must be provided to ensure
operational safety.
Step 6: Connect the Micro Inverters
6.1.Remove the temporary shipping cap from the t-branch on the AC trunk cable
and connect the micro inverter. Ensure the connection is secure and locked
into place by listening to “click” sounds when both lock pins are fully
inserted.
WARNING
Correct AC grounding and short circuit protection must be provided to ensure
operational safety.
6.2.Repeat for all micro inverters in the AC circuit.
6.3.For any unused connectors on the AC trunk cable, replace the temporary
shipping cap with a Sealing Cap. Listen for a click as the Sealing Cap is
connected to ensure that it is securely locked into place.
Note : Please check which type of the trunk cable you have before ordering micro
inverters.
Step 7: Terminate the Unused End of the AC Trunk Cable
7.1.Strip 10mm (about 0.5in) of the outer sheath from the end of the AC trunk
cable.
7.2.Each end cap has four parts: the sealing nut, clamp ring, seal and cap. Slide
the sealing nut, clamp ring and then the seal onto the AC trunk cable.
7.3.Insert the individual wires into the slots inside the cap of the end cap.
7.4.Screw the hex nut onto the cap. Use a wrench to ensure the hex nut is
screwed in all the way to the base of the cap.
WARNING
Ensure the AC trunk cable and end cap do not touch the roof by using cable
clips or tie wraps to attach the trunk cable to the PV racking. Ensure that all
cabling is located underneath the PV module.
Step 8: Connect the AC Junction Box
Connect the AC trunk cable to the AC junction box using the appropriate gland or
strain relief fitting. The AC trunk cable requires a strain relief connector with an
opening of 1.6 cm (0.6 in) in diameter.
The wires in the AC trunk cable are identified by color: L1 is sheathed in Black, L2
is sheathed in Red, Neutral is sheathed in White and Ground is sheathed in
Green. Note the Neutral/White wire is unused.
WARNING
Although the AC trunk cable includes a grounding wire, the continuous grounding
conductor or grounding washers is still required.
Step 9: Connect the PV Modules
Mount the PV modules above the micro inverters, and then connect each micro
inverter to a PV module. (The micro inverter and PV module’s DC cables have two
connectors. Connect the micro inverter positive connector to the PV module
negative connector, and vice versa.)
CAUTION
Micro inverters and PV modules are installed using a one to two ratio.

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POST-INSTALLATION
WARNING
Service/changes to your electrical system should be carried out only by
qualified electricians. Do not attempt to repair this product; it does not contain
user-serviceable parts. Repairs and internal servicing should only be performed
by authorized service personnel.
Commissioning and Operating
Step1. Turn on the AC disconnect or the circuit breaker for each micro inverter
AC branch circuit.
Step2. Turn on the main utility-grid AC circuit breaker. Your system will start
producing power after five minutes.
Step3. Register PV system on Darfon Solar Portal. (Monitoring System - Optional).
Depending on the strength of the signal, it can take up to 2 hours before
the monitoring system detects all the micro inverters in the PV system.
LED
LED Status
Mode
Possible Reason
Status

Solid Green
Generate
Operating normally

Flashing Green
Prepare
Initialization, restart

Solid Orange
Single Output
Another signal input voltage is
abnormal

Flashing Orange
Renew/Abnormal
F/W update or Memory Exception

Solid Red
Danger
GFDI activated

Flashing Red
Protect
OVP, UVP, OFP, UFP, ISL, OPP
○
Off (at daytime)
Fail
Dead or No PV input
GFDI Fault
GFDI fault is defined as an unintentional, electrically conducting connection
between an ungrounded conductor of an electrical circuit and the normally
non-current-carrying conductors, metallic enclosures, metallic raceways, metallic
equipment or earth. When a Ground fault occurs, the GFDI will trigger the LED
light to show continuous Red, and the micro inverter will automatically
disconnect all conductors as a safety precaution.
If the GFDI has detected a ground fault, please contact with the installer and
follow the Operation Manual to clear this condition. Or you can contact Darfon
customer support at [email protected].
Disconnecting a Micro Inverter
Disconnect all PV circuits from Distribution Panel before any work is done. Never
disconnect the micro inverters from PV modules while under load.
Step1. Disconnect the micro inverter from the AC trunk cable. Use an appropriate
unlock tool to disconnect the mated connector pair. Do not force open the
connector pair in any way without the appropriate unlock tool. Damages
to the connectors may occur if wrong tools are used.
Step2. Completely cover the PV module with an opaque cover.
WARNING
Be aware that DC power/voltage is generated when the PV module is exposed to
light.
Step3. Using a multi-meter, verify that the DC conductors between the PV
module and the micro inverter carries no current.
Step4. Disconnect the PV module from the micro inverter. To disconnect the
micro inverter’s DC connectors, please use a DC unlock tool.
Step5. If GEC grounding was installed, disconnect the grounding wire or washer
from the micro inverter.
Step6. Remove the micro inverter from the PV racking.
WARNING
Do not leave the AC connector on the AC trunk cable exposed for an extended
period of time. If the removed micro inverter will not be replaced with another
micro inverter immediately, connect a sealing cap to the connector.

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MONITORING SYSTEM
At this stage, the majority of the PV system is already installed: the PV modules
and micro inverters. The following section list steps on how to install the
monitoring system. Before installing, review and follow all important safety
instructions listed in the beginning of this manual.
PLC Box Overview
Feature Function
AC(PLC)
signal Input
Connects to the AC cable in the PV system.
DC Power
Input
Plug the Power adapter to the DC Jack on the PLC Box.
(Input: AC 100-240V 50-60Hz, Output: DC+12V 1A)
Power LED
The Power LED will be solid
when on
Signal LED
The Signal LED will flash three times during normal startup.
Represents the strength of the signal. (1 LED - weak signal, 4 LEDs - strong
signal.) Weak Signal: Strong Signal:
Termination
Resistor
If the distance between the Data Logger and PLC Box is greater than 50m,
then the termination resistor switch on both the Data Logger and PLC Box
should be switched ON. If the distance between the Data Logger and PLC
Box is less than 50m, then the termination resistor switch on both the Data
Logger and PLC Box should be switched OFF.
Data Logger Overview
Feature
Function
Power Terminal
Block
Plug the Power adapter to the power terminal on the Data Logger.
(Input: AC 100-240V 50-60Hz, Output: DC+12V 2A)
LED Indicators
Displays messages:
Power Source/WLAN(WiFi)/SIM A/SIM B/LAN 1~LAN 4 /USB/Serial
Port/High 3G Signal/Low 3G Signal
WLAN Port
Use to connect to the Internet(Roter).
LAN Port
Use to connect to the Client device.
USB Port
Connector to the USB Storage device.
Reset Button
To reset the data logger, press and hold the button for 10 seconds. The
data logger will restart with the default factory settings.
RS485 Port
Use to connect to the PLC Box.
WiFi Antenna
WiFi antenna is a device for sending or receiving WiFi waves.
3G Antenna
3G antenna is a device for sending or receiving 3G waves.
SIM Card Slot
Plug in the SIM Card to open 3G function
PLC signal Input
Power LED
Signal LED(x4)
SIM A
DC Power Input
Termination Resistor
SIM B
Power Terminal Block

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LED Indication
LED Icon
Indication LED Color
Description
Power Source 1 Green Steady ON: Device is powered on by power source 1
Power Source 2
(*1)
Green Steady ON: Device is powered on by power source 2
WLAN (WiFi) Green
Steady ON:Wireless radio is enabled
Flash: Data packets are transferred
OFF:Wireless radio is disabled
SIM A Green Steady ON: SIM card A is used
SIM B Green Steady ON: SIM card B is used
~
LAN 1 ~ LAN 4 Green
Steady ON: Ethernet connection of LAN is established
Flash: Data packets are transferred
High 3G Signal Green Steady ON: The signal strength of 3G is strong
1 If both of power source 1 and power source 2 are connected, the device will
choose power source 1 first. The LED of power source 2 will remain OFF at this
condition.
Low 3G Signal Green Steady ON: The signal strength of 3G is weak
USB Green Steady ON: If USB device is attached
Serial Port Green Steady ON: If serial device is attached
Installing the PLC Box and Data Logger
CAUTION
Disconnect the PV circuit from any grid power before installing the PLC box to
the AC trunk cable or AC junction box.
Step 1: Connect the Data Logger to the Router.
There are two ways to connect the data logger. One way is a direct Ethernet
connection and the other is through a power bridge connection. If the data logger
can be placed nearby the router, then a direct Ethernet connection will be setup.
If the data logger cannot be placed near the router, then a power bridge
connection will be setup.
Note: To mount the data logger, use the included wall-mount frame.
Option 1: Direct Ethernet Connection
Connect the data logger to the router with the Ethernet cable. If the
Ethernet cable does not reach the router, either a longer Ethernet
cable is needed or setup a power bridge connection.
Option 2: Power Bridge Connection
A Power Bridge connection is suggested to be used with the data
logger cannot be place near the router. The Power Bridge comes in
a set of two. Plug in one to the Power Bridges to a nearby AC outlet
and connect it to the data logger. Plug in the other Power Bridge to
an AC outlet near the router and connect it to the router.
Step 2: Install the PLC Box.
Connect DC power to the PLC Box through 12V/1A AC adaptor. Connect the
AC wiring (PLC Signal) from the PLC Box to the AC Trunk Cable or the AC

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Junction Box. The PLC Box will need to be placed in and secured to the AC
Junction Box. The wires in the AC trunk cable are identified by color
Step 3: Connect the Data Logger to the Router
Place the data logger (model: DDL100 or DL200) near the router, then make
a direct Ethernet connection. If the data logger cannot be placed near the
router, then the installer can add either a wireless access port or a power
line communication port (not supplied with the micro inverter).
Note: To mount the data logger, use the included wall-mount frame.
Step 4: Connect the Data Logger to the PLC Box
Insert the red/black wiring into the RS485 connectors, and then
insert the connectors into the Data Logger and PLC Box. (Ensure
there is length of the red/black wiring is sufficient for installation)
Note: Ensure the RS485 connectors are wired properly:
Data Logger RS485 D+ PLC Box RS485 T +
Data Logger RS485 D- PLC Box RS485 T–
Note: If installing more than one PLC Box in the system, daisy-chain the PLC
Boxes together using RS485 cables. Then connect the last PLC Box in the series to
the Data Logger using the RS485 cable.
Step 4: Connect Power
Plug in the Data Logger into the AC outlet. (Be sure the adapter is connected to
the Data Logger before it is plugged into to the outlet.)

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TROUBLESHOOTING
Troubleshooting the Micro Inverter
If the PV system is not operating correctly, use the steps in this section to
troubleshoot the problem. If the issue cannot be corrected using the steps in this
section, please contact an authorized service representative.
Power Status LED Indications
LED Status
Mode
Possible Reason
Action

Solid Green
Generate
Operating normally
No action


Flashing Green Prepare Initialization, restart
Wait 5 min after the grid power
returns to normal

Fast flashing
Green
Protect
The instantaneous voltage
changes too much
Wait 5 seconds after the grid
power returns to normal
Solid Orange Fail
Another signal input
voltage is abnormal
Contact the Technical Support


Flashing Orange
Renew
/Fail
F/W update or Memory
Exception
Contact the Technical Support
 Fast flashing
Orange Protect
The instantaneous
voltage/frequency changes
too much
Wait 5 seconds after the grid
power returns to normal


Flashing Red Protect
OVP, UVP, OFP, UFP, ISL,
OPP, reading memory
Wait 5 min after the grid power
returns to normal
Solid Red Danger GFDI activated
DO NOT touch! Check PV system
for current leakage
○Off (at daytime) Fail Dead or no PV input
Check module connection; if
connection is ok, then replace MI
Depending on the position/location of the installed micro inverter, the use of
hand-held mirrors may be needed. If the micro inverter’s Power Status LED is off
or red, then follow these steps:
Step1. Verify that any upstream AC disconnects, as well as the dedicated circuit
breakers for each AC circuit, are functioning properly and are closed.
Step2. Verify that the AC voltages at the electrical utility connection and at the
junction box for each circuit are within the appropriate range.
Wire Connection
240V (Single Phase)
L1 to L2
193to 242VAC
Step3. Verify the PV module DC voltage is within the allowable voltage and
wattage range shown in the Technical Specifications section.
Step4. Verify the DC leads are connected correctly between the micro inverter
and the PV module.
If the problem persists, contact the Technical Support at [e-mail].
Troubleshooting the PLC Box
If the monitoring system is not
operating correctly, use the steps below to troubleshoot the problem. If the issue
cannot be resolved using these steps, please contact inverter maker’s technical
services.
LED Status
Description
Power LED
●
No Light
No Input Power
●
Solid Green
Operating
Signal Strength LED
●●●●
No Light
No Signal from Micro Inverters
●●●●
One Solid Green
Weak Signal from Micro Inverters
●●●●
Four Solid Green
Strong Signal from Micro Inverters
If the Power LED status shows no light:
•Verify the Power Adaptor is securely connected to the PLC Box
•Verify the AC source connected to Power Adaptor is turned on
If the RS485 LED status shows no light:
•Check the RS485/CAT5 connection between the PLC Box and Data Logger
•Verify the Data Logger has power
If the Signal Strength LEDs status shows no lights or only one solid green LED:
•Check the connections and cable distances between the PLC Box and micro
inverters
•Place the PLC Box as close to the micro inverters as possible. Maximum cable
distance is 164ft (50m)
Power LED
Signal LED(x4)
RS485
DC Power Input
Termination Resistor

G640 Micro Inverter User Manual
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If the Signal Strength LEDs status shows 3 or 4 solid green lights, but there is no
communication:
•Turn the PLC Box termination resistor on
Troubleshooting the Data Logger
If the monitoring system is not operating correctly, use the steps below to
troubleshoot the problem. If the issue cannot be resolved using these steps,
please contact inverter maker’s technical services.
Power LED did not turn on:
•Verify that the Power adapter is connected to the Data Logger and the AC
outlet.
•Verify that there is power in the AC outlet.
Serial Port LED did not turn on:
•Check the RS485 connection between the Data Logger and the PLC Box.
•Verify the PLC Box has power.
WLAN LED did not turn on:
•Check the WLAN connection between the Data Logger and the router(Internet).
•Verify the router has power.

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TECHNICAL SPECIFICATIONS
Micro Inverter
G640
INPUT FROM PV (DC)
Number of Panels per Inverter
Two
Nominal Power
640 W (320W per panels)
Recommended STC Panel Power
200~350 W
Maximum Panel Voltage
60 V
Operating Voltage Range
22~60 V
MPPT Voltage Range
24~45 V
Minimum Start Voltage
24 V
Maximum Current per Panel
14A
OUTPUT DATA (AC)
Nominal Continuous Power Rating
600 W
Nominal Frequency (Range)*
60 (57~63) Hz
Power factor
> 0.99
Total Harmonic Distortion
< 3%
Nominal Voltage / Range
220 /193~242V
Nominal Output Current
2.73A
EFFICIENCY
Peak Efficiency
96%
CEC Weighted Efficiency
95.5%
Nominal Static MPPT Efficiency
>99.5%
MECHANICAL & ELECTRICAL
Night time power consumption
< 20 mW
Ambient Operating Temp. Range
-40 to 65 °C
Internal Operating Temp. Range
-40 to 85 °C
Weather-Proof Rating
NEMA 6 or IP67
Dimensions LxWxH
313*242*34mm
Weight
2.3 kg
COMPLIANCE & COMMUNICATION
UL, FCC, IEEE Compliance
UL 1741, FCC Part 15, Class B, IEEE 1547
Communication
PLC
* Range programmable at the factory per customer request or local regulation
PLC Box
COMMUNICATION
Serial Port Interface
1 x RS485 (For Data Logger)1
Maximum Number of Devices
Up to 24 Micro Inverters
Maximum Transmission Distance
2
Up to 164ft (50m)
MEMORY
Internal Memory
Flash ROM 16K bits
MECHNICAL DATA
Ambient Temperature
-10
°
C to 50
°
C
Dimensions (D x W x H)
6.9 x 4.5 x 1.7 in (174 x 115 x 44mm)
Weight
0.5 lbs (0.2kg)
Environmental Protection Rating
IP20 (Indoor Use Only)
Compliance
UL60950-1, FCC Part 15B
POWER
Power Consumption
7.2W (Maximum)
Power Supply Input
12VDC
Power Supply Input Current
600mA@12VDC (Maximum)
1The maximum distance between the Data Logger and PLC Box is 1312ft (400m).
2The distance from the PLC Box to the micro inverter at the farthest end of the AC branch.
Data Logger
COMMUNICATION
Serial Port Interface
1 x RS485 (For PLC Box)1
Maximum Number of Devices
Up to 3 PLC Boxes
Ethernet Port
1 x RJ45
VISUALIZATION & MEMORY
Graphics User Interface (GUI)
Web-based
Memory Expansion
USB memory stick (max. SDHC 32G)
MECHNICAL DATA
Ambient Temperature
-10
°
C to 50
°
C
Dimensions (W x H x D)
7.4 x 4.3 x 1.2 in (187 x 110 x 31mm)
Weight
1.3 lbs (0.59kg)
Environmental Protection Rating
IP20 (Indoor Use Only)
Compliance
UL60950-1, FCC Part 15B, Part 15C
POWER
Power Consumption
15.5W
Power Supply Input /Ouput
100 - 240VAC, 50-60Hz
1The maximum distance between the Data Logger and PLC Box is 1312ft (400m).

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SAMPLE WIRING
240V 1Φ

G640 Micro Inverter User Manual
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INSTALLATION MAP TEMPLATE Use this map to draw the array and keep track of the micro inverters placement by serial number. Peel
off and use secondary serial number label on the micro inverter.
Installer
Array Name
Site Address
Azimuth:
Date ______________
Sheet______of ________
Please print this page
Customer
Tilt:


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NOTES
Manufactured by:
Darfon Electronics Corp.
167 Shan-ying Road, Gueishan
Taoyuan 333, Taiwan, (R.O.C.)
Tel: [phone]
USA Office:
Darfon America Corp.
103A Pioneer Way
Mountain View, CA 94041
Tel: [phone]
For more information:
www.darfonsolar.com
©2015 Darfon Electronics Corp. ©2015Darfon America Corp.
All rights reserved. All specifications are subject to change without prior notice.