Grid-Tied Residential Inverters
Installation and Operation Manual
21
5. Maintenance & Troubleshooting
5. MAINTENANCE
& TROUBLESHOOTING
The inverter provides two indicator lights that help troubleshoot problems:
The light on the left is a RED LED.
1.
The RED LED illuminates any time the DC voltage is below the inverters startup
DC voltage, such as at night. The RED LED blinks if the inverter has had a fault
condition, and the vacuum fluorescent display (VFD) displays a fault code. Possible
faults are listed in Table 5-1.
The light on the right is a GREEN LED.
2.
The GREEN LED illuminates any time the DC voltage is above the inverter’s
DC start voltage and all operational parameters are met. When the GREEN light
illuminates, the inverter tries to invert power from the PV array.
5.1 Red and Green LED Lights ON
If this condition occurs (both lights are on solid at the same time), contact PV Powered
Technical Support for assistance.
5.2 Ground Fault
A ground fault inverter reports a ground fault error if it senses a voltage potential
between ground and the grounded terminal of the PV array. This condition can only
occur if the ground fault fuse in the inverter has opened.
A ground fault happens because the grounded conductor of the PV array is broken
•
in the DC disconnect. Ground faults are typically caused by a pinched wire con-
necting some part of the array or DC wiring to earth ground.
A less likely cause is limited to multiple inverter installations, when the array
•
strings are mismatched.
Example: Inverter A has the positive from array 1 and the negative from
array 2.
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