Verifying Proper Powerbox Connection - SolarEdge SE8k Installation Manual

SolarEdge Installation Guide for Three Phase Inverters – EU

The PowerBox output cables are labeled + and – .

Connect the Plus (+) connector of the output wire of the first PowerBox
in the string to the Minus (-) connector of the second PowerBox in the
string. Repeat this step for each PowerBox in the string. This procedure
is similar to the standard procedure for connecting PV modules.
WARNING!
Make sure that the Plus (+) and the Minus (-) connector cables are firmly and
totally inserted.
Verifying Proper PowerBox
Connection
►
To verify proper PowerBox connection:

Make sure the PV modules are exposed to sunlight during this process.
Otherwise, the PowerBoxes may not be on.

Verify each string individually before connecting it to the other strings
or to the inverter.

Each PowerBox connected to a PV module initially produces a safe
voltage of 1 V. A string with properly connected PowerBoxes should
produce 1 V per PowerBox in the string. For example, if 10
PowerBoxes are connected in a string, then 10 V should be produced.
Use a voltmeter with at least 0.1V measurement accuracy to verify that
the total voltage produced is in accordance with the number of
PowerBoxes in the string.

If 0 V is measured for the string, check for a disconnection of the
outputs of one of the PowerBoxes.

If the voltage is lower than the quantity of PowerBoxes (for
example, 9 V when 10 PowerBoxes are connected), verify whether
one or more of the PowerBoxes are not connected, meaning they
were skipped during the string connection process. If they are all
connected, verify whether one or more of the PV modules is not
connected properly to its PowerBox.
Installing the PowerBoxes
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