Step 3, Connecting Power Optimizers In Strings; Constructing Strings - SolarEdge Power Harvesting System Installation Manual

SolarEdge Installation Guide for Three Phase Inverters – EU – Version 1.5
Step 3, Connecting Power
Optimizers in Strings
Power optimizers must be connected in series in order to construct strings.
IMPORTANT NOTE:
SolarEdge power optimizers are energized by the PV modules to which they are
connected. String length must not be less than 16 power optimizers or the entire
string may shut down. (Please refer to the power optimizer datasheets for the exact
minimum and maximum number of power optimizers permitted in a string.)
NOTE:
Completely shaded PV modules may cause the affected 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 string length requirement is met
when taking into account the lighted panels only. In favorable conditions, if there is a
chance that so many PV modules will be in complete shade such that less than 16
will remain, then add more PV modules.
IMPORTANT NOTE:
Be sure to record power optimizer serial numbers during their installation, as this
information may be required later for troubleshooting.
The SolarEdge Monitoring Portal can be used to access SolarEdge site information,
as described in the Step 4, Reporting and Monitoring Installation Data section on
page 42.

Constructing Strings

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To connect power optimizers in a string:
IMPORTANT SAFETY FEATURE:
As long as the power optimizers are unconnected to the inverter and the
inverter is OFF, the power optimizers will output a safe 1V voltage during
installation.

The full string can either be directly connected to the inverter or
connected in parallel to another strings and then together they are
connected to the inverter.

You can construct and connect in parallel strings of unequal length,
meaning the number of power optimizers in each string does not have
to be the same.
Installing the Power Optimizers
22