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• If there is a string current backfeed fault, first check whether the optimizer is
offline.
• Contact the dealer if the measures listed in the “Troubleshooting Method” col-
umn have been taken but the problem persists. Contact SUNGROW if the
dealer fails to solve the problem.
9.2 Maintenance
9.2.1 Maintenance Notices
The DC switch can be secured with a lock in the OFF position or a certain angle beyond the
OFF position.(For countries “AU” and “NZ”)
Risk of inverter damage or personal injury due to incorrect service!
• Be sure to use special insulation tools when perform high-voltage operations.
• Before any service work, first disconnect the grid-side AC circuit breaker and
check the inverter status. If the inverter indicator is off, please wait until night to
disconnect the DC switch. If the inverter indicator is on, directly disconnect the
DC switch.
• After the inverter is powered off for 10 minutes, measure the voltage and cur-
rent with professional instrument. Only when there is no voltage nor current
can operators who wear protective equipment operate and maintain the inverter
• Even if the inverter is shut down, it may still be hot and cause burns. Wear pro-
tective gloves before operating the inverter after it cools down.
• When maintaining the product, it is strictly prohibited to open the product if
there is an odor or smoke or if the product appearance is abnormal. If there is
no odor, smoke, or obvious abnormal appearance, repair or restart the inverter
according to the alarm corrective measures. Avoid standing directly in front of
the inverter during maintenance.
To prevent misuse or accidents caused by unrelated personnel: Post prominent
warning signs or demarcate safety warning areas around the inverter to prevent
accidents caused by misuse.
9 Troubleshooting and Maintenance User Manual
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