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SM20 New ->ST20 

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Siemens Solar has established very high quality standards and as a result our main production plants are certified to ISO 9001. Constant checks and inspections guarantee uniform high quality. Every module that leaves the production line is subject to thorough visual inspections as well as mechanical and electrical tests.
Electrical Parameters1   SM20
12V
Maximum power rating Pmax [Watts] 20
Minimum power rating Pmin [Watts] 18
Rated current Imp [Amps] 1.38
Rated voltage Vmp [Volts] 14.5
Short circuit current Isc [Amps] 1.6
Open circuit voltage Voc [Volts] 18.0
Thermal Parameters    
Nominal operating cell temperature2 [�C] 45
Change of Isc with temperature,   +0.6mA/�C (+0.04%/�K)
Change of Voc with temperature,   -0.058 Volts/�C (-0.34%/�K)
Qualification Test Parameters3    
Temperature cycling range [�C] -40 to +85
Humidity, freeze, damp heat condition [% RH] 85
Maximum system voltage [Volts] 20
Wind loading or surface pressure [N/m�] (PSF) 2400 (50)
Maximum distortion4 [degrees] 1.2
Hailstone impact withstand
(diameter @ velocity)		 [mm @ m/s]
(in @ MPH)		 25 @ 23
(1.0 @ 52)
Physical Parameters    
Number of series cells   30
Length [mm] (in) 567 (22.3)
Width [mm] (in) 328 (12.9)
Depth [mm] (in) 35 (1.4)
Weight [kg] (lbs) 2.5 (5.6)
Warranty5    
Power >= 90% of minimum power [Years] 10
1 Determined under standard test conditions (STC): Irradiance = 1000w/m� cell temperature = 25 �C; solar spectral irradiance per ASTM E892 (Air Mass = 1.5).
2 Determined under nominal operating conditions (NOC): Irradiance = 800 w/m� ambient temperature = 20 �C; wind speed = 1m/s.
3 Qualification Tests performed as per CEC 503 Test Specification, to ensure durability and performance in outdoor conditions.
4 Diagonal lifting of module corner with three corners fixed.
5 To original consumer purchaser. See full Limited Warranty for all conditions.
 

 

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