Sunny Boy SB4000TL-21 (MFR)
Sunny Boy SB4000TL-21 (MFR)
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  • Description
  • Specifications
The ideal solution particularly for demanding PV arrays and partially shaded plants: As multi-string devices, the new transformerless Sunny Boy models offer maximum planning and realization flexibility. The high DC voltage of 750 V proves to be a cost advantage, since fewer parallel strings are required. In addition, the integrated grid management functions make the devices suitable for universal applications and allow them to actively support the grid. The new wall mounting system further facilitates installation.

The Sunny Boy solar inverters characterize the Technology- and Quality-Leadership of our company. They are optimally suitable for use in small and mid-range systems. They impress with first class efficiency, user-friendliness and reliability.

The Sunny Boys have been repeatedly acclaimed - and are constantly developing. Our new Generation come with innovative technologies such as OptiTrac and H5-Topology. These make the device even more efficient - and therefore ensuring a very good solar yield.


SKU SB4000TL-21(MFR)
Brand SMA (made in Germany)
Country of Manufacture Germany

Input (DC)

Max. DC power (@ cos =1) 4200 W
Max. input voltage 750 V
MPP voltage range / rated input voltage 175 V 500 V / 400 V
Min. input voltage / initial input voltage 125 V / 150 V
Max. input current input A / input B 15 A / 15 A
Max. input current per string input A / input B 15 A / 15 A
Number of independent MPP inputs / strings per MPP input 2 / A:2; B:2

Output (AC)

Rated output power (@ 230 V, 50 Hz) 4000 W
Max. apparent AC power 4000 VA
Nominal AC voltage range 220 V, 230 V, 240 V / 180 V 280 V
AC power frequency / range 50 Hz, 60 Hz / -5 Hz ... +5 Hz
Rated power frequency / rated power voltage 50 Hz / 230 V
Max. output current 22 A
Power factor at rated power 1
Adjustable displacement factor 0.8 overexited ... 0.8 underexited
Feed-in phases / connection phases 1 / 1


Max. efficiency / European efficiency 97 % / 96.4 %


Input-side disconnection device yes
Ground-fault monitoring / grid monitoring yes / yes
DC surge arrester Type II, can be integrated
DC reverse-polarity protection / AC short-circuit current capability / galvanically isolated yes / yes /
All-pole sensitive residual current monitoring unit yes
Protection class (according to IEC 62103) / overvoltage category (according to IEC 60664-1) I / III

General Data

Dimensions (W / H / D) 490 / 519 / 185 mm
Weight 26 kg / 57.3 lb
Operating temperature range -25 C ... +60 C
Noise emission (typical) 25 dB(A)
Self-consumption (night) 1 W
Topology Transformerless
Cooling concept Convection
Degree of protection (according to IEC 60529) IP65
Degree of protection of connection area (according to IEC 60529) IP54
Climatic category (according to IEC 60721-3-4) 4K4H
Maximum permissible value for relative humidity (non-condensing) 100 %


DC terminal SUNCLIX
AC terminal Spring-type terminal
Display Graphic
Interface: RS485 / Bluetooth opt. / yes
Warranty 5 years, extended warranty optional
Multi-function relay opt.