Installing the Power Optimizers
SolarEdge Installation Guide for Three Phase Inverters
– EU – Version 1.5
24
If the voltage is lower than the quantity of power optimizers (for
example, 9 V when 10 power optimizers are connected), verify
whether one or more of the power optimizers 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 power optimizer.
If the voltage is too high, then apply the CAUTION below.
CAUTION:
If the measured voltage is too high, the installation may not have a safe low
voltage. PROCEED WITH CARE!!
Please note that a deviation of up to 2V for a full string is considered
normal.
A voltage that is higher than the quantity of power optimizers may be
caused by one of the following reasons:
An extra power optimizer is connected in the string.
The output of a PV module may be connected in the string instead of
the output of a Optimizer.
A malfunction of one of the power optimizers.
Perform the following if the total string voltage is too high:
Verify that only power optimizers are connected in the string and that no
PV module outputs are connected without a power optimizer.
Disconnect the wires that connect the power optimizers in the string.
Measure that there is 1V safety voltage for each individual power
optimizer in order to locate the power optimizer that does not output the
proper voltage.
If a malfunctioning power optimizer is located, check its connections,
polarity, module and voltage.
If a malfunction cannot be bypassed or resolved, skip the malfunctioning
power optimizer, thus connecting a shorter string.
Do not continue before finding the problem and removing the
malfunctioning power optimizer.
IMPORTANT SAFETY FEATURE:
After a PV module is connected to the power optimizer, the power
optimizer outputs a safe voltage of 1 V. We suggest verifying this output for
the first few power optimizers that you connect in order to verify their
proper connection. Take note that if you use a tracker, the power optimizer
will turn ON only if the tracker is tracking the sun and at least 2 W of power
are provided by the PV module.
