※ 7.2 Maintenance
Danger
Risk of inverter damage or personal injury due to incorrect service!
Always keep in mind that the inverter is powered by dual sources: PV strings and utility
grid.
Before any service work, observe the following procedure.
① Disconnect the AC circuit breaker and then set the DC load-break switch of the invert-
er to OFF;
② Wait at least 5 minutes for inner capacitors to discharge completely;
③ Verify that there is no voltage or current before pulling any connector.
Caution
Keep non-qualifi ed persons away!
A temporary warning sign or barrier must be posted to keep non-qualifi ed persons away
while performing electrical connection and service work.
Attention
Restart the inverter only after removing the fault that impairs safety performance.
Never arbitrarily replace any internal components.
For any maintenance support, please contact Sunways. Otherwise, Sunways shall not be
held liable for any damage caused.
Note
Servicing of the device in accordance with the manual should never be undertaken in
the absence of proper tools, test equipment or the latest revision of the manual which
has been clearly and thoroughly understood.
Items Methods Period
System clean
Check the temperature and dust of the inverter.
Clean the inverter enclosure if necessary.
Check if the air inlet and outlet are normal.
Clean the air inlet and outlet if necessary.
Six months to a year (it de-
pends on the dust contents
in air.)
8 Technical Parameters
Model STT-80KTL STT-100KTL STT-110KTL
Input
Start-up Voltage (V) 200 200 200
Max. DC Input Voltage (V) 1,100 1,100 1,100
Rated DC Input Voltage (V) 620 620 620
MPPT Voltage Range (V) 200-950 200-950 200-950
No. of MPP Trackers 8 10 10
No. of DC Inputs per MPPT 2/2 2/2 2/2
Max. Input Current (A) 8*26 10*26 10*26
Max. Short-circuit Current (A) 8*40 10*40 10*40
backfeed current to the array (A) 0 0 0
Output
Rated Output Power (W) 80,000 100,000 110,000
Max. Output Power (W) 88,000 110,000 121,000
AC output rated apparent power(VA) 80,000 100,000 110,000
Max. Apparent Power (VA) 88,000 110,000 121,000
Rated Output Voltage (V) 3/N/PE，230/400V 3/N/PE，230/400V 3/N/PE，230/400V
Rated AC Frequency (Hz) 50/60 50/60 50/60
AC output rated current（A） 115.5 144.3 158.8
Max. Output Current (A) 127 158.8 174.8
The measured Inrush current (A) 27.7A@3.9ms 27.7A@3.8ms 28.4A@3.8ms
maximum output fault current (A) 300 300 300
maximum output overcurrent protection（A）
300 300 300
Power Factor 0.8 leading …0.8 lagging
Max. total harmonic distortion < 3% @Rated Output Power
DCI < 0.5%In
8 Technical Parameters7 Troubleshooting
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