62 Electrical installation
DC cabling connection procedure
Assembling the DC connectors to the cables
WARNING! For protection against electric shock, the DC connectors must be
completely isolated from the power supply during assembly.
Description
1 Turn OFF the DC switch on the inverter front panel and isolate the inverter from all
possible power sources. See Isolating the inverter from external power sources on page
14.
2 The manufacturer’s type codes for required MC4 cable connectors:
PV-KBT4
Used for
connecting to
DC+ at the
inverter
PV-KST4
Used for
connecting to
DC- at the
inverter
3 Check that the Multi-contact MC4 connectors are properly assembled to the DC input
cables. For assembly instructions, see Assembling the DC connectors to the cables on
page 62.
4 Check that the DC cables are marked with the string number and polarity (+ or -).
Markings must be permanent so that they will be legible throughout the lifetime of the
inverter.
5 Check for correct polarity of the strings at the MC4 connectors using a voltmeter.
6 Isolate DC input cabling from the solar array.
7 Remove the bottom cover. See Removing and replacing the front cover and bottom cover
on page 51.
8 Remove sealing caps from DC + and DC- receptacles on the inverter which will be used.
Do not throw the caps away; store the sealing caps at the installation site.
9 Visually check that the cable connectors are compatible with the corresponding inverter
receptacles.
10 Connect the strings to the inverter one string at a time, starting with connectors DC1+ and
DC1-. Avoid making sharp bends in the cables close to the connectors.
11 Proceed to AC output cabling procedure
Description
1 Check that the DC cables are isolated from power. See Isolating the inverter from
external power sources on page 14.
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