Step 3: Connecting Power Optimizers In Strings - SolarEdge SE Series Installation Manual

For each of the power optimizers:
Connect the Plus (+) output connector of the module to the Plus (+) input
connector of the power optimizer.
Connect the Minus (-) output connector of the module to the Minus (-) input
connector of the power optimizer.

Step 3: Connecting Power Optimizers in Strings

You can construct parallel strings of unequal length, that is, the number
of power optimizers in each string does not have to be the same. The
minimum and maximum string lengths are specified in the power
optimizer datasheets. Refer to the
1. Connect the Minus (-) output connector of the string's first power optimizer to the
Plus (+) output connector of the string's second power optimizer.
2. To minimize electromagnetic interference (EMI), make sure to minimize the distance
between the positive and negative DC cables.
For detailed instructions, see:
https://www.solaredge.com/sites/default/files/se-emi-performanceapplication-note.pdf
WARNING!
In case of dual-input power optimizers, seal any unused input connectors
with the supplied pair of seals.
Three Phase Inverter with SetApp Configuration PN: SEXXK-XXXXIXXXX
Chapter 2: Installing the Power Optimizers
Figure 3: Power optimizer connectors
Designer for string length verification.
18