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3) DC cable connection
To ensure the optimum performance of the inverter, please read the
following guidelines before DC connection:
(a) Confirm the DC configuration referring to Table 3-5 and ensure that the
maximum open circuit voltage of the PV modules is lower than 1000
Vdc under any conditions;
(b) Confirm that the PV strings for each MPPT of the inverter are of the
same type and specification before connection. The number,
orientation, and tilt of PV strings may differ for different applications.
(c) Check the polarity (Figure 3-22) before plugging the DC connectors
with the cables of PV strings according to the following steps:
i. Use a multi-
meter to measure the PV strings’ cable ends and check
the polarity.
ii. The positive (+) terminal of cable should match the positive (+)
terminal of inverter’s DC input.
iii. The negative (-) terminal of cable should match the negative (-)
terminal of invert
er’s DC input.
WARNING:
DC fuses should be replaced by qualified personnel for safety
reasons. Make sure the inverter is isolated from both the DC and AC
sources and check to ensure the hazardous high voltage has been
fully discharged before operating on the inverter.
NOTICE:
It is important to use a multi-meter to check the polarity of DC input
cables to avoid any risk of reverse polarity.
