I N S T A L L A T I O N M A N U A L
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PV MODULE (DC) CONNECTION
Preparation
Before connecting to the PV strings, install a separate DC circuit breaker between the inverter and each PV string. This
system can connect to two strings of PV modules with MPPT control.
Configure each PV input as recommended in the table below. Vmp is a PV panel’s max power point voltage. The PV
charging efficiency is maximized when the PV system’s voltage is close to Best Vmp.
TERMINAL
MARK
PV INPUT POWER
TYPICAL AMPERAGE
CABLE SIZE
TORQUE
BEST V
MP
V
MP
RANGE
PV input 1
3.25kW
13A
12 AWG
1.4~1.6 Nm
360V
250V~430V
PV input 2
3.25kW
13A
12 AWG
1.4~1.6 Nm
360V
250V~430V
Notes:
1. Use 600VDC/20A circuit breakers.
2. The overvoltage category of the PV input is II.
WARNING.
Because this inverter is non-isolated, only two types of PV modules are acceptable: single crystalline and poly
crystalline with only Class A-rated. To avoid any malfunction, do not connect any PV modules with possibility of leakage
current to the inverter. For example, non-grounded PV modules will cause leakage current to the inverter.
CAUTION.
To reduce the risk of damage due to surge, Darfon recommends surge protection between the modules and the
inverter.
CAUTION.
To reduce the risk of injury, use the proper cable size for PV module connection.
CAUTION.
Exceeding the maximum input voltage can destroy the unit. Check the PV string voltage before wiring the
connection.
Connecting the PV Arrays
Step 1. For each PV input string, make sure the input voltage is
between 250VDC and 430VDC and the maximum current
is 13A.
Step 2. Turn off the circuit breaker.
Step 3. Strip 10mm of insulation from the PV cables and insert
the conductors into the cable ring terminals.
PV1+, PV1-, PV2+ and PV2-
Step 4. Check correct polarity of connection cable from PV
modules and PV input connectors. Then, connect
positive pole (+) of connection cable to positive pole (+)
of PV input connector. Connect negative pole (-) of
connection cable to negative pole (-) of PV input
connector.
WARNING.
Never touch terminals of the inverter directly. It will cause
lethal electric shock.
DC Cable for PV Connections
8mm
4mm
10mm
Connecting to PV module
