Technical data
Voltage Converter
Voltage Converter
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Steca Elektronik GmbH | 87700 Memmingen | Germany | Fon +49 (0) 8331 8558-0 | Fax +49 (0) 8331 8558-132 | www.steca.com
Steca MDC / MDCI
DC-DC-voltage converters
DC-DC voltage converters are used when the DC-output vol-
tage of the PV system does not match the requirements of
the appliance.
Since a voltage level of 12 V is required for most low-vol-
tage appliances such as lamps, multimedia devices, radios or
mobile phones, the various models of the voltage converters
deliver a stable supply of 12 V. For instance, if a 12-V ener-
gy-saving light is operated in a 24-V or 48-V system, then a
suitable DC-DC voltage converter must be inserted between
the load output of the charge controller and the 12-V ener-
gy-saving light.
The Steca MDC and MDCI voltage converters are designed
for use in photovoltaic systems. The models with an output
voltage of 13.6 V can also be used as battery chargers for a
12-V battery in a 24-V system.
For safety reasons, the Steca MDCI series is electrically insu-
lated to protect the user. Both the Steca MDCI and the Steca
MDC series are protected against high voltage spikes at the
input, thus preventing harmful voltage spikes at the input of
the loads.
Product features
High efficiency
Automatic detection of voltage
Wide input voltage range
Best reliability
Electronic protection functions
Overtemperature and overload protection
Reverse polarity protection
Short circuit protection
Certificates
Compliant with European Standards (CE)
4988
138
152
43
22
7
4x ø5
Steca MDCI 100
163
160
108
154
64
4
21
4x ø6
Steca MDCI 360
[ar eas o f a pp lic at ion ]
360 W
[70 W ... 360 W]
88
35
89
45
11
4
2x ø4,5
98
Steca Solsum VC
Voltage converter
When appliances such as cassette recorders or radios which
are designed to use dry batteries are connected to 12 V or 24
V batteries, they normally require a lower voltage than that
supplied by the system battery.
These appliances can be powered using the Steca Solsum VC
adjustable voltage converter. The Solsum VC is also suitable
for operating a 12-V appliance with a 24-V battery. The maxi-
mum output current for doing so is 1.5 A. When developing
this converter, the greatest value was placed in safety and
reliability. Five programmed output voltages enable universal
usage.
Product features
Wide input voltage range
Low own consumption
Screw terminals allow universal and rapid installation
Electronic protection functions
Overtemperature and overload protection
Reverse polarity protection
Short circuit protection
Displays
2 multi-coloured LEDs show operating states
for operation and polarity
Operation
Configuration by jumpers
Certificates
Compliant with European Standards (CE)
Manufactured according to ISO 9001 and ISO 14001
—
[ar eas o f a pp lic at ion ]
18 W
[10 W ... 18 W]
VC
Characterisation of the operating performance
System voltage 12 V (24 V)
Own consumption 2 mA (Ue = 12 V)
DC input side
Input voltage
1.
5 V … 30 V
DC output side
Output voltage 3 V; 6 V; 7.5 V; 9 V; 12 V
Output current
2.
< 1,500 mA
Fitting and construction
Terminal (fine / single wire) 1.5 mm
2
/ 2.5 mm
2
- AWG 16 / 14
Dimensions (X x Y x Z) 98 x 88 x 35 mm
Weight 50 g
Technical data at 25 °C / 77 °F
MDC MDCI
2412-5 2412-8 2412-12 2412-20 2412-30 1224-7 100 200 360
Characterisation of the operating performance
Nominal power 65 W 105 W 160 W 275 W 415 W 170 W 100 W 200 W 360 W
Max. efficiency 90 % 85 %
DC input side
Input voltage 18 V … 35 V 20 V … 35 V 9 V … 18 V 9 V … 18 V / 20 V … 35 V /
30 V … 60 V / 60 V … 120 V
DC output side
Output voltage 13,2 V 13,8 V 24 V 12,5 V / 24 V
Output current 5.5 A 8 A 12 A 20 A 30 A 7 A 8 A / 4 A 16.5 A / 8 A 30 A / 15 A
Operating conditions
Ambient temperature -20 °C ... +40 °C -20 °C ... +45 °C
Fitting and construction
Galvanic isolation no yes
Dimensions (X x Y x Z) 87 x 55 x 49
mm
87 x 85 x 49 mm 87 x 115 x 49
mm
87 x 125 x 49
mm
87 x 115 x 49
mm
88 x 152 x 49
mm
88 x 182 x 49
mm
163 x 160 x 64
mm
Weight 170 g 250 g 260 g 480 g 600 g 300 g 500 g 600 g 1.4 kg
Cooling principle convection fan convection convection fan
Technical data at 25 °C / 77 °F
Determining the output current
Output current 3 V 6 V 7.5 V 9 V 12 V
Output voltage 12 V 1,000 mA 1,500 mA 1,500 mA 1,500 mA 1,500 mA
1.
System voltage 24 V 400 mA 500 mA 500 mA 600 mA 700 mA
1. The input voltage has to be at least 2 V higher than the output voltage.
2. The max. current depends on the input and output voltage.
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