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Transformerless with three level topology
Max efficiency up to 98.6%
Dual MPPT inputs accommodating wide voltage range
Compact structure design
Complete protection function such as anti-islanding, short circuit, overload
Easy installation and free maintenance
WiFi or GPRS (optional) communication
Component brands
Specification
Model No
ST17KTL
ST20KTL
ST25KTL
DC side/Input parameters
Max. DC power [W]
18500
22000
25000
Max. DC voltage [Vdc]
1000Vdc.
1000Vdc.
1000Vdc
Min. System start/Shut down voltage [Vdc]
250
250
250
MPPT voltage range[Vdc]
250~850
250~850
250~850
Max. input current [A]
25A*2
25A*2
25A*2
Number of MPP trackers
2
2
2
Strings per MPP tracker
2
2
2
AC side/output parameters
Nominal output power [W]
17000
20000
25000
Maximum output power [W]
18500
22000
27000
Nominal output voltage/range [V]
400V/ 280-490V（adjustable)
AC grid frequency/range [Hz]
50Hz,60Hz(auto-selection) / 44Hz-55Hz; 54Hz-65Hz
Maximum output current [A]
25
30
36
AC connection(with PE)
3W/N/PE
3W/N/PE
3W/N/PE
Current distortion(THDi) [%]
<1.5
<1.5
<1.5
Power factor [%]
>99.95
>99.95
>99.95
Efficiency
Maximum conversion efficiency[%]
98.5
98.6
98.8
European efficiency[%]
98.1
98.2
98.3
MPPT efficiency[%]
99.9
99.9
99.9
Safety and protection
yes
DC reverse-polarity protection
yes
Anti-islanding / Overvoltage protection
yes
Short circuit protection
yes
Leakage current protection
yes
Grid monitoring / Ground fault monitoring
yes
DC/AC side varistors(thermally protected)
yes
General Parameters
Dimension(L/W/H)[mm]
505*525*245
Weight (kg)
37
Embedded DC Switch
Optional
Night power consumption[W]
<0.2
Isolation type
Transformerless
Protection degree
IP65 according to IEC60529
Operation temperature[ºC]
-25 ~ 60
Cooling concept
Natural convection
Acoustic noise level[dB]
<25
Operating altitude[m]
<2000 without power derating
Display
Graphic LCD
Communication Interface
Standard WIFI; GPRS(optional)
Certificates and Approvals
CE-(EMC/LVD) : EN(IEC) 61000-1/-2/-3/; EN(IEC) 62109-1/-2;IEC 61727/62116;G83-3/G59-3; EN50438;VDE-0126-1-1;VDE-AR-N4105;AS4777.2;AS4777.3
Projects
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