Power Optimizers Troubleshooting - SolarEdge Solar Inverter Installation Manual

Appendix A: Errors and Troubleshooting

Power Optimizers Troubleshooting

Problem
String voltage is 0V
String voltage not 0V but
lower than the number of
optimizers
String voltage is higher
than the number of
optimizers
WARNING!
If the measured
voltage is too high, the
installation may not have a
safe low voltage.
PROCEED WITH CARE!
A deviation of ±1% per
string is reasonable.
Pairing to the inverter
failed
SolarEdge Installation Guide – MAN-01-00057-2.2
Possible Cause
Output of one or more power
optimizers is disconnected
One or more of the power optimizers
are not connected in the string
One or more of the modules are not
connected properly to their power
optimizer inputs
Wrong polarity connection on one of
the strings
One or more extra power optimizers
are connected in the string
A module is connected directly to the
string, without a power optimizer.
A malfunction of one of the power
optimizers
SafeDC mode was previously
disabled using the SolarEdge Key
The power optimizers are shaded
Possible Solution
Connect all power optimizer outputs
Connect all power optimizers
Connect the modules to the optimizer
inputs
Check polarity of the string output
using a voltmeter and correct if
needed.
Check if an extra power optimizer is
connected in the string. If not –
proceed to next solution.
Verify that only power optimizers are
connected in the string and that no
module outputs are connected
without a power optimizer. If the
problem persists, proceed to the next
step.

Disconnect the wires that connect
the power optimizers in the string.

Measure the output voltage of
each power optimizer in order to
locate the power optimizer that
does not output the 1V safety
voltage.

If a malfunctioning power
optimizer is located, check its
connections, polarity, module,
and voltage.

Do not continue before finding
the problem and replacing the
malfunctioning power optimizer.

If a malfunction cannot be
bypassed or resolved, skip the
malfunctioning power optimizer,
thus connecting a shorter string.
Enable the SafeDC using the
SolarEdge Key
If you connected the inverter to the
SolarEdge monitoring portal using
one of the communication options,
you can perform pairing remotely.
Before leaving the site, make sure
that the inverter ON/OFF switch is
ON and S_OK indication appears on
the LCD to indicate connection to the
monitoring portal.
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