Mastervolt SCM20 PWM, Installation Manual, Page: 15 / 16

EN / SCM20 & SCM40 PWM User’s Manual
15
5 TECHNICAL DATA
5.1 SPECIFICATIONS
Model SCM20 PWM SCM40 PWM
Article no.: 131822000 131824000
Nominal battery voltage (U
NOM
): 12V / 24 V (Auto recognition) 12V / 24 V (Auto recognition)
PV-INPUT @ U
NOM
= 12V @ U
NOM
= 24V @ U
NOM
= 12V @ U
NOM
= 24V
Typical number of cells: 36 cells 72 cells 36 cells 72 cells
Absolute maximum PV Voltage: 28V
DC
55V
DC
28V
DC
55V
DC
Maximum PV input current*: 20A 20A 40A 40A
Control: PWM
Dusk to dawn threshold voltage: 5V 10V 5V 10V
BATTERY OUTPUT @ U
NOM
= 12V @ U
NOM
= 24V @ U
NOM
= 12V @ U
NOM
= 24V
Maximum charge current (I
MAX
): 20A 20A 40A 40A
Charge voltage, Absorption: 14.4V 28.8V 14.4V 28.8V
Charge voltage, Float (flooded): 13.25V 26.5V 13.25V 26.5V
Charge voltage, Float (AGM / gel batteries): 13.8V 27.6V 13.8V 27.6V
Battery temperature compensation: –30 mV/°C –60 mV/°C –30 mV/°C –60 mV/°C
DC consumption (at night):
7mA 7mA 7mA 7mA
Battery voltage operating window:
10.0-15.0V 20.0-30.0V 10.0-15.0V 20.0-30.0V
Charge algorithm: Three step (Bulk, Absorption, Float)
Battery types*: Flooded, AGM, Gel
LOAD OUTPUT @ U
NOM
= 12V @ U
NOM
= 24V @ U
NOM
= 12V @ U
NOM
= 24V
Maximum output current: 20A 20A 40A 40A
Under voltage disconnect (adjustable**): 10.8~11.8V 21.6~23.6V 10.8~11.8V 21.6~23.6V
Under voltage reconnect (adjustable**): 11.6~12.6V 23.2~25.2V 11.6~12.6V 23.2~25.2V
GENERAL
Galvanic isolation between PV and battery: No, common negative conductor
Dimensions in mm [inch] (h x w x d): 96 x 189 x 53 mm [3.8 x 7.4 x 2.0 inch]; see also section 5.2
Weight: 480g
Operating Temperature Range:
–20°C ≤ T
AMB
≤ +50°C [–4°F ≤ T
AMB
≤ 122°F]
Full Power Temperature range: –20°C ≤ T
AMB
≤ +40°C [–4°F ≤ T
AMB
≤ 104°F] (no power de-rating)
Non-operating Temperature range: –25°C ≤ T
AMB
≤ +75°C [–13°F ≤ T
AMB
≤ 167°F] (storage temperature)
Relative Humidity: 5% to 95% non-condensing
Protections: Reversed polarity, output overload, output short circuit, overheating,
battery under voltage, battery over voltage
Protection degree: IP23
MasterBus connectivity: No
Load modes**: Always on, Dusk to Dawn, Evening, Manual
Terminals: Screw terminals, max. wire size 16mm
2
* Short circuit current of the PV module ** Refer to section 2.6 for configuration
Specifications are subject to change without prior notice.