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The SUN2000 has three DC switches (DC SWITCH 1, DC SWITCH 2, and DC SWITCH3).
DC SWITCH 1 controls routes 1–6 of DC input terminals, DC SWITCH 2 routes 7–12, and DC
SWITCH 3 routes 13–18.
Select DC input terminals according to the following rules:
1. Evenly distribute the DC input power cables to the DC input terminals controlled by the three
DC switches. DC SWITCH 1 is preferred.
2. Maximize the number of connected MPPT circuits.
Ensure that the PV module output is well insulated to ground.
Selecting DC Input Terminals
1. Use the MC4 EVO2 PV connectors delivered with the SUN2000. If the PV connectors are lost
or damaged, purchase the connectors of the same model. The device damage caused by
incompatible PV connectors is beyond the warranty scope.
2. Before connecting DC input power cables, label the cable polarities to ensure correct cable
connections. If the cables are connected incorrectly, the SUN2000 may be damaged.
3. Measure the voltage at the DC input end using a multimeter. If the voltage is a negative
value, the DC input polarity is incorrect. Correct the polarity. If the voltage is greater than
1500 V, too many PV modules are configured to the same string. Remove some PV modules.
4. If polarity of the DC input power cable is reversed and the DC switch is ON, do not turn off
the DC switch immediately or unplug positive and negative connectors. The device may be
damaged if you do not follow the instruction. The caused equipment damage is beyond the
warranty scope. Wait until the solar irradiance declines and the PV string current reduces to
below 0.5 A, and then turn off the three DC switches and remove the positive and negative
connectors. Correct the string polarity before reconnecting the string to the SUN2000.
5. For models of the crimping tool and removal wrench, use the recommended model or
contact your Staubli dealer.
6. Connect the PV string connector to the inverter connector, and then pull back the PV string
connector along the axial direction to check whether the connectors are securely connected.
7. The connector must be securely connected. Damages caused by improper connection are not
covered under the warranty.
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