G 6 4 0 M i c r o I n v e r t e r
U s e r M a n u a l
G 6 4 0 U M d r a f t
v1 20180928
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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.
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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)
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AC trunk cable
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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)
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Red/Black Wiring for RS485
Other Tools/Equipment
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Outdoor-rated AC junction box(es)
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Cable clips and/or tie wraps
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Gland/strain relief fittings (on per AC junction box)
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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
