Solar Charging Controller MPP 250 Duo Digital

Article-No. 1715



MPP 250 1715

For Solar Modules with:

max. 250 Wp Module Capacity

max. 15 A Module Current

max. 50 V Module Voltage

Charging Options:

Batterien 1S

1 Supply- and 1 Starter Battery


Please notice, that the device is only suitablte for solar panels up to the maximum power (Wp) and below the maximum persmissable voltage (Voc). In addition the controller is not suitable for an input-side connection (+/- solar panels) of wind, water, fuel or motor generators, power supplies, batteries or other current sources.

MPP Solar Controller for high-quality campers, caravans and boats. VOTRONIC Solar Controllers of series "MPP" (Maximum-Power-Point) with characteristic line of charging „IU1oU2“ are the link between solar panel(s) and battery (batteries). Controllers according to the MPP technology are continuously and automatically calculating the maximum power yield (MPP) of the solar modules several times per minute. The voltage surplus of the solar module will be transformed to a higher charging current for the battery (realised by high-frequency switching controller technology with high efficiency). This surplus of charging current ensures short charging times and the best possible power yield of the solar system. Working fully automatically and maintenance-free, the solar controllers MPP offer the following functions:

  • Increased MPP charging current compared with conventional controllers, due to ultramodern controller technology (microprocessor) by 10 % to 30 % (efficiency > 95 %). This enhanced capacity shows particularly in cooler times of the year, such as in case of foggy weather conditions or gloomy diffuse light (winter break).
  • Switchable characteristic lines of charging or optimum charging of lead- gel-/dryfit, AGM/fleece or acid/lead-acid batteries, as well as LiFePO4 battery systems with integrated protection and battery management system.
  • The charging voltage being free from peaks is controlled in such a way, that any overcharging of the batteries is excluded.
  • Two Battery Charging Ports: Automatic charging of the main supply board battery (BOARD I), as well as support charging and trickle charging (max. 1 A) of the vehicle's starter battery (Start II) with overcharge protection.
  • Unattended Charging: Standard protection against overload, overheating, reverse battery and back discharge of the battery (in case of insufficient solar power, such as at twilight, at night etc.).
  • Parallel and Floating Operation: Observation of the characteristic lines of charging, even with simultaneous operation of consumers.
  • Overcharge protection: Reduction of the charging current of the battery in case of excessive solar power and full battery. Immediate recharging in case of power consumption to ensure always the best possible charging state of the battery.
  • Characteristic Line of Charging "IU1oU2": A defined charging boost (U1) avoids harmful acid accumulation (lead) and provides equalization charge to the individual battery cells (lead and lithium). After that, automatic trickle charging (U2).
  • Charging Cable Compensation: Automatic compensation of voltage losses on the charging cables.
  • On-board Mains Suppression Filter: Unproblematic parallel operation with wind-driven and motor-driven generators, mains supply chargers, dynamos etc.
  • Measurement Output for EBL, electroblock possibly existing in the living area of the vehicle: Allows convenient application of the (solar) current display being installed in the electroblock for supervision of the solar system.
    Please check in advance the compatibility of your Schaudt Electrobloc (EBL) and the corresponding control panel, because we are not able to give any warrenty for this.
  • Terminal „AES“ (only MPP 250, MPP 350 and MPP 430): Automatic commutation of refrigerators with “AES” (Automatic Energy Selector, Electrolux/Dometic) from gas operation to 12 V operation in case of excess solar power.
  • Connection for Battery Temperature Sensor (Order No. 2001): Lead batteries: In case of low outside temperatures, full charging of the weak battery is improved by automatic adaptation of the charging voltage to the battery temperature, and in case of summery temperatures unnecessary battery gassing and battery load will be avoided.
    LiFePO4 Batteries: Battery protection in case of high temperatures and particularly in case of low temperatures. Highly recommended, if the battery temperature might drop below 0 °C during operation.
  • Ready for connection of the Votronic Solar Display LCD-Solar Computer S for optimum control of the system.
  • Indicators for operating state "AES", "Full", "> 80%", "MPP" and "Low Voltage"
  • Control output EBL, prepared for “Elektroblock” with solar current display, cable set, Art. 2007, required
  • Terminal "AES" with LED display:
    Automatic commutation of Dometic/ELECTROLUX refrigerators from gas operation to 12 V-operation in case of sufficient solar power by means of “AES” (Automatic Energy Selector)

Technical Details

 Nominal Operating Voltage (AC) in [V] 12
 Capacity Solar Module max. [Wp] 250
 Current Solar Moddule max. [A] 15.0
 Voltage Solar Module max. [V] 50
 Charging Current Batt. I / II max. [A] 17.5 / 1.5
 Characteristic Line of Charging IU1oU2
 Battery Type adjustable Acid/Lead-Acid, Gel, AGM, LiFePO4
 Current Consumption Stand-by in [A]
 Overcharge Protection yes
 Reverse Current Protection (during the night)
 On-board mains suppression filter
 Number of Charging Ports 2
 Protection against Overload, Overtemperature, Short-circuit
 Connection for Temperature Sensor
 Compensation of voltage loss on charging cables yes
 Connection for LCD-Solar-Computer S
 Signal Output "EBL" for Display "Solar" Charging Current Battery
 Temperature Range [°C] -20 to +45
 Dimensions in [mm] - Dimensions incl. mounting flanges, without connections 131 x 77 x 40
 Weight in [g] 235
 Mark of conformity (CE)
 Ambient Conditions, Humidity of Air:  max. 95 % RH, No Condensation
 Delivery Scope: Operating Manual

Charging Programs

1 „Gel“: Charging Program for Gel Batteries, Characteristic Line IU1oU2
Adapted to closed, gas-tight gel/dryfit batteries with determined electrolyte, which are generally requiring a higher charging voltage level and longer dwell times U1 to achieve short charging times with particularly high capacity storage and to avoid total discharge. Also recommended for EXIDE MAXXIMA a high-current battery in AGM filament technology.

2 „AGM“: Charging Program for AGM/Fleece Batteries, Characteristic Line IU1oU2
Adapted to charging closed, gas-tight AGM (absorbed glass mat) batteries and batteries in lead-fleece technology requiring a particularly high level U1 with adapted dwell times for full charging and after that a moderate level U2 for trickle charge (round cell and plate technology).

4 „UNIVERSAL“: Charging Program for Lead, Acid/Lead-Acid Batteries: Characteristic Line IU1oU2
Universal program for charging and conservation of charge of acid batteries in vehicles (mixed operation mobile/stationary). Still offers short charging times, good charging factor and good acid mixing with average level U1 for open and closed, low-maintenance, maintenance-free standard, drive, lighting, solar and heavy duty batteries.

Li „LiFePO4“: Charging Program for Lithium Batteries, Characteristic Line IU1oU2
Charging program for lithium LiFePO4 batteries with completely integrated electronic system and safety circiut (BMS).


Anleitung Katalog


LCD-Solar-Computer S 1250

 Aktueller Solarstrom    Solarbatteriespannung    EBL Kabelsatz 2007

Solar Current




Cable Set EBL
(Art. 2007)

 Eingeladene Solarkapazitaet    Eingeladene Solarenergie  
Temp Sensor 2001

LCD-Solar-Computer S
(Art. 1250)

Solar Capacity


Solar Energy


Temperature Sensor 825
(Art. 2001)

Solar Data Extender 1440

The Solar Data Extender combines the data from up to three solar controllers so that they can be shown on a single display. The usual LCD displays (e.g. LCD solar computer S or VPC combination panel) can still be used. It is compatible with the following devices:

  • Solar Charging Controllers in SR- und MPP-Technology (from Serial-No. 14Vxx.xxxxx)
  • Battery Charger Series VBCS Triple
  • LCD-Solar-Computer S (from Serial-No. 15V40.xxxxx)
  • VPC Combi Panel with Solar Function
  • Bluetooth Connector S-BC

Solar Data Extender 3n1
(Art. 1440)


BootAlso available with humidity-proof electronic system:
Solar Charging Controller MPP 250 Duo Dig. 
(Art. 11715)


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