The steps in this chapter refer to module add-on power optimizers. For smart
modules, start from
Step 3: Connecting Power Optimizers in Strings
on page
21
Step 3: Connecting Power Optimizers in Strings
on page 21 Also refer to the
documentation supplied with the smart modules.
The power optimizer can be placed in any orientation.
If connecting more modules than optimizer inputs in parallel, use a branch
cable. Some commercial power optimizer models have a dual input.
Position the power optimizer close enough to its module so that their cables
can be connected.
Make sure to use power optimizers that have the required output conductor
length:
Do not
use extension cables between a module and a power optimizer,
between two modules connected to the same optimizer, or between two
optimizers other than in the cases specified below.
You can use extension cables between power optimizers only from row
to row, around obstacles within a row, and from the end of the string to
the inverter, as long as the maximum distance is not exceeded.
NOTE
The total conductor length of the string (excluding
power optimizers’ conductors; including home runs and
necessary extensions between optimizers) should not
exceed the following:
Inverter model
Total conductor length ( from DC+
to DC- of the inverter)
Three phase up to
SE25K
1000 ft. /300 m
Three phase SE25K
and above
2300 ft./ 700 m
Use at least 11 AWG/ 4 mm² DC cables.
Completely shaded modules may cause their power optimizers to temporarily
shut down. This will not affect the performance of the other power optimizers in
the string, as long as the minimum number of unshaded power optimizers
connected in a string of modules is met. If under typical conditions fewer than
-Three Phase System Installation Guide MAN-01-00057-4.1
18 Installation Guidelines
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