Chapter 2: Installing the Power Optimizers
SolarEdge Installation Guide – MAN-01-00002-1.7
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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
on page 61. Refer to the SolarEdge Site Designer for string length verification.
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
Connect the rest of the power optimizers in the string in the same way.
3
Verify correct polarity by measuring the string polarity with a voltmeter.
Figure 5: Power Optimizers Connected in Series
Step 4, Verifying Proper Power Optimizer Connection
After a module is connected to a power optimizer, the power optimizer outputs a safe voltage of 1V.
Therefore, the total string voltage should be equal to 1V times the number of power optimizers connected
in series in the string. For example, if 10 power optimizers are connected in a string, then 10V should be
produced.
1
Measure the voltage of each string individually before connecting it to the other strings or to the
AC/DC Safety Switch.
2
Use a voltmeter with at least 0.1V measurement accuracy.
3
Make sure the modules are exposed to sunlight during this process; otherwise the power optimizers
may not be powered. If you use a tracker, the power optimizer will turn ON only if the tracker is
tracking the sun and at least 2W are provided by the module.
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-
+
+ -
