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
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 manner.
WARNING!
If using a dual-input power optimizer and some inputs are not used, seal the
unused input connectors with the supplied pair of seals.
AVERTISSEMENT!
Si un optimiseur à double entrées est utilisé et que certaines entrées ne sont
pas connectées, fermez ces entrées avec la paire de couvercles fournie.
Figure 7: Power optimizers connected in series
3. If you intend to monitor the installation, using the monitoring platform, record the
physical location of each power optimizer, as described in
Physical Layout using Installation Information on page 54.
Step 4: Verifying Proper Power Optimizer Connection
When a module is connected to a power optimizer, the power optimizer outputs a safe
voltage of 1V (±0.1V). Therefore, the total string voltage should equal 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.
Make sure the PV modules are exposed to sunlight during this process. The power
optimizer will only turn ON if the PV module provides at least 2W.
Chapter 2: Installing the Power Optimizers
29
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