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Step-up voltage regulator – Reinforced passive dissipation – Input 36V to 46V – Output 56V / 12.5A / 700W – SUR-3646-56-12.5-4

Generates a stabilized 56V / 700W from the charging voltage of a 48V battery.
Advantageously replaces conventional dc/dc converters (with higher efficiency) when input/output insulation is not required.


Input voltage: 36 to 46 V
Output voltage: 56 V
Output current: 12.5 A
Output power: 700 W
Efficiency: > 95%
Maximum leakage: 32 W


  • Transforms a solar generator into a 28V / 700W battery charger
  • High efficiency allowing reduced dimensions and low weights
  • Wire loss reduction, in case of remote mounting (connections ≤ 72mm2)
  • Neutralized vibrations + tropicalisation + sealing: IP63 / IP67 casting

Mechanical data

  • Dimension: 225.2 x 120 x thickness 47 mm
  • Volume: 1000 cm3
  • Weight: 1150 g
  • Equipped with a dissipator 225
  • Connections through large streamlined clamps enabling wire sections up to 72mm²
  • 2 mounting possibilities: on DIN-rail with clip or on a wall with two screws

Thermal characteristics

  • Temperature without derating: -40°C to +50°C
  • Temperature with derating: -40°C to +90°C (at decreasing power)
  • Storage temperature: -40°C to +100°C
  • Thermal resistance: 1°C / W
  • Temperature coefficient: 2.10-4 / °C

For more information:

Download here the PDF presentation for this step-up regulator

Download here the complementing PDF presentation for all step-up voltage regulators

Additional information

Weight 1350 g
Dimensions 280 × 180 × 100 mm
Product family

step-up voltage regulators

Input voltage

36V to 46V

Output voltage


Output current


Output power


Type of cooling

reinforced passive dissipation



  • Limited overloads: as long as decreasing Vout remains ≥ Vin + 0.5V
  • Abnormal overloads: please add a fuse or current-limiter on the output or input
  • Under-voltage or sufficient input over-voltage: the regulator no longer elevates the input voltage
  • Filters: input and output; shields: two parallel metallic plates
  • Thermal protection: lowering of Vout to # Vin – 0,5V (automatic reset)
  • Vibrations, tropicalisation, sealing: iP63 to iP65 casting
  • Stainless steel for the clamping braces
  • Ohmic wire loss reduction, with connectors receiving sections up to 72mm2

Standards and specifications

  • Marking CE/UL 60950-1 / EN 60950-1 / iEC 60950-1 / RoHS / 55022A if optional external filter
  • Flammability: horizontal test for electrical applications, according to UL 94 HB standard
  • Worldwide manufacturers for active parts. Patent, assembling and final controls: Elecdan Converter