Troubleshooting - SolarEdge 3000A-US Installation Manual

Troubleshooting

String voltage is 0V
Cause: Output of one or more power optimizers is disconnected
Solution: Connect all power optimizer outputs
String voltage not 0V but lower than no. of optimizers
Possible causes:

One or more of the power optimizers are not connected in the string
Solution: Connect all power optimizers

One or more of the modules are not connected properly to their power optimizer inputs
Solution: Connect the modules to the optimizer inputs
String voltage higher than no. 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.
Si la tension mesuree est trop haute, la tension basse de securite pourrait manquer dans
l'installation. REDOUBLEZ DE PRECAUTION.
Une deviation de ±1% par string est raisonnable.
Possible causes:

An extra power optimizer is connected in the string
Solution: Check if an extra power optimizer is connected in the string. If not – proceed to next
solution.

A module is connected directly to the string, without a power optimizer.
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.

A malfunction of one of the power optimizers
Solution:

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.

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 replacing the malfunctioning power optimizer.
SolarEdge Installation Guide – MAN-01-00002-1.7
Chapter 2: Installing the Power Optimizers
17