Sungrow SG20KTL User Manual

9 Troubleshooting and Maintenance User Manual
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9.2 Maintenance
9.2.1 Routine Maintenance
Items Methods Period
System clean
Check the temperature and dust of the inverter.
Clean the inverter enclosure.
Check the humidity and dust of the environment.
Meanwhile check whether the filter function of
the air inlet is ok. Clean the air inlet and outlet,
when necessary.
Six months to a
year (it
depends on the
dust contents
in air.)
Fans
Check whether there is crack of the fan blade
Check whether there is any abnormal noise of the
fan turning.
Clean or replace the fans.
Once a year
9.2.2 Maintenance Instruction
Disconnect the inverter from the grid first and then PV arrays before any
maintenance work.
Lethal voltage still exists in the inverter. Please wait at least ten minutes
and then perform maintenance work.
Cleaning Fan
There are four fans in the inverter for ventilation. It is recommended that the fans
are cleaned every six months.
Step 1 Disconnect the output and input side.
Step 2 Wait for at least ten minutes.
Step 3 Dismantle the inverter in the reversed direction of “Installation procedure”.
Step 4 Loosen the fixed screws on the back of the inverter.
Step 5 Clean the fan with soft brush or vacuum cleaner.
Step 6 Reinstall the inverter.
Step 7 Re-connect the inverter.
Step 8 Restart the inverter.

Sungrow SG20KTL Specifications

General

Model	SG20KTL
Type	String Inverter
Rated Output Power	20 kW
Max. DC Input Power	30 kW
Max. DC Input Voltage	1100 V
Start Voltage	200 V
Number of MPPTs	2
Max DC Input Current per MPPT	26 A
Max. Input Current per MPPT	26 A
Rated AC Power	20 kW
Rated AC Voltage	400 V
AC Voltage Range	310 V - 480 V
Rated Grid Voltage	400 V
Rated Grid Frequency	50 Hz / 60 Hz
Total Harmonic Distortion	< 3%
Power Factor at Rated Power	1
Adjustable Power Factor Range	0.8 leading - 0.8 lagging
Max. Efficiency	98.6%
European Efficiency	98.4%
Efficiency	98.6%
DC Switch	Yes
Protection Class	IP65
Cooling Concept	Natural Cooling
Max. DC Power	22000 W
Max. AC Power	22 kW
Grid Frequency	50/60 Hz
Operating Temperature Range	-25 °C ~ +60 °C
Input Voltage Range	200 V - 1000 V