3.3.3.3 DC Conductor Connection
To ensure the optimum performance of the inverter, please read the
following guidelines before performing any DC connections.
1. Confirm the maximum open circuit voltage of the PV modules is
lower than 1000VDC under any conditions.
2. Confirm that the PV modules for each MPPT within the inverter are
of the same type and specification before connection.
3. Ensure correct polarity of the PV Strings before terminating the DC
source circuits within the wirebox. Referring to Figure 3-23, the
wiring from the PV string pairs must be checked according to the
following steps:
(a) Use a multi-meter to measure the PV strings’ conductor
ends and check the polarity.
(b) The positive (+) terminal of the conductor should match the
positive (+) terminal of inverter’s DC input.
(c) The negative (-) terminal of the conductor should match
the negative (-) terminal of inverter’s DC input.
NOTICE:
It is important to use a multi-meter to check the polarity of the DC
source circuit conductors to avoid any risk of reverse polarity.
WARNING:
A reversed string is not protected by the inverter and can cause
severe damage to equipment and personnel. A reversed string is
extremely hazardous and will result in a blown fuse when the
irradiation is high. The voltage across the blown fuse can be as
much as two times Voc and could prevent proper fuse operation
resulting in a fire.
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