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Solar Charge Controller

Compact Solar Charge Controller with up to 15A
with extended Functions
like high Current Pulses to extend the life-Time of Batterie

Techn.Data click here


In order to have a cost efficient and simple charge controller, this device was developed

Up to 15 Amperes Charging Power using POWER-MOFET-Transistors.

Overcharging-Protection of the Battery by fast Pulse-Wide-Modulation. This Mode gives better charging-results than slow Pulse-charging.

Boost-charging from time to time (depending from the discharging level or at least once a month).  Boost-charging avoids the degeneration of Liquid-Batterys.

80 % of the Batterys die from a degeneration of the Battery-Plates. Due to research-work of the University of Vienna, Austria and NASA,USA this degeneration can be reduced drastically by very short High Current Pulses to the Battery. This charge controller is equipped with this feature, to extend life-time of the Battery.

Deep-Discharge-Protection with up to three Outputs with max 3 x 10 Amperes. One MOSFET-Output and two Relay-Outputs can be used.

The Outputs can be programmed to be switched on only for a dedicated time (three hours in the evening for example). This is interesting in areas where the capacity of the Batterys is reduced.

The two Relay can also be switched on by a Manual Switch. They provide max. 10A, 220V.

Applicable for all Types of Lead- Batterys (Gel-Type etc.)

Applicable for 12V or 24V-Systems. The System-Voltage is verified automatically. If you use the Relays, you have to order a 12V or 24V-Version.

Additional Inputs for charging of the Lead-acid Batterys with a 230 V / 12V or 24V Transformer

Many Safety Precautions like:
- High Temperature-Protection
- Reverse-Connection Protection for the Solar-Panels and Battery
- Automatic Short-circuit Protection for the Load, no more replacement of Fuses are necessary
- Over-voltage Protection for the Input of the Solar-Panels
- Protection for "no-Battery"-connection (if only Solar-Panels are connected, the voltage will raise very    high)
- No Reverse-Current to the Panels at night

One Major Problem of Solar-Systems is the stealing of the Panels. This is a very serious Point for Solar-Systems. This Charge-Controller has a Multistage theft-protection.

With a Moving-detector: A Loud Alarm can be generated if somebody is coming close to the Solar-System
With an external Circuit: A high voltage is activated at the Panels-Frame as soon as somebody is coming close to the Panels. If somebody touches the Solar-Panels, he gets a electrical shock. Of course the voltage can not hurt anybody.
Optional the Alarm can generate a Telephone-notification to a Mobil phone

Integrated Charging-Unit for rechargeable NiCd, NimH -Batterys (2 x Type AAA and / or Type AA), which can be used for Radios, Torches etc. 12V chargers for this application are very rare!

Optional: One short-circuit-protected Voltage Output with a fixed voltage of 5 V or any other if needed. For to connect small Radios or TV directly to the Unit.

Three LED's for to Display Battery empty, Solar charging and NiCd/NimH-Charging

By a Program-Switch some functions like Battery-Type etc. can be programmed. You can also activate a Simulation-Mode for the Battery-Voltage.

For Data-Logging a PC or Notebook can be connected (via serial cable or USB with Adapter). The Battery-Voltage can be logged and evaluated (By Excel for example)

Easy update of new Software by a small Program and the Data-Cable.

Optional you can order a Programming-Adapter and Compiler. Thus you can make your own Program-changes and you can even load other Software for using this Unit for another purpose (for a Irrigation-System for example or for a Alarm-System etc.)..

more Information and Downloads


Hints and Information about Solar Technology

Calculation for a Solar Home-System and List of Items

Download of the Software

Download of the Bootloader for to load the Software

Click here to download the list of Features and Operation-Manual as pdf:    PDF_klein

Calculation-Sheet (Excel) and Prices with Extensions

External Wiring for the Solar charge-controller

as pdf:

Solar Charge Controller


Specifications Medium Solar charger




Mega168 with 16K Flash-Memory, 512 bytes EEPROM, 1K RAM, 3 timers / Counter, 6 analogously input 10 bits, one serial-Port, I2C-Port,



serial port


Bootloader, to load new Software by serial-Port


LED-Lamps (Solar charge, NimH-Charge, Batt.empty)


free analogue-Inputs



1 with 15A, 12V/24V


2 for 12V/24V/220V

max.Current Relay-Output

10 A

optional Impulse-Relay (only needs Energy by switching)

yes,  optional

Loading lead-batteries by external power adapter

yes, optional

Loading lead-batteries by solar / wind Power until max.


Load Output 12V/24V max.

15 A

Pulser for lead-batteries to the extend lifetime of the battery

yes, optional

PWM-Output 12V / 24V (Pulse-width-Modulation)

yes for Solar


yes,  optional

Data recording by serial interface

yes, battery and NimH-Voltage

Evaluate the data with the software LogView


Output auxiliary-Voltage fixed 10V, 0,5A

yes, optional

Output auxiliary-Voltage variable (by resisitor), 0,5A

yes, optional

Tiny Solar-Charger Solar Charge Controller 6V/12V, 10A

Solar charger
  • Up to 10 Amperes charging-current using Power-MOSFET Technology
  • Overcharge Protection of the Battery by a dynamic Pulse-Charging
  • Boost-charging (depending from the discharging level or at least once a month). Loading to the gassing-voltage for a specific time in order to improve the lifetime of the battery.
  • The loading of the lead-acid-batteries can be realized with a 230 V / 12V DC Transformer as well
  • Deep-Discharge Protection for the battery with a Delay for switch off
  • For 6 V Systems and 12 V Systems applicable. Automatic switch to according System-Voltage
  • For Acid-Batteries and Gel-Batteries
  • Many Safety Precautions: short-circuit Protection, Over-voltage Protection, Battery Reverse connection protection
  • Integrated charger for NiCD, NiMH-cells. Using Solar people often use torches or battery-radios as well, which need new batteries frequently. Optional Integrated Loading-unit for two cells of Type AA oder AAA NiCD, NiMH-Batteries.
  • Optional: One fixed voltage Output with any Voltage you need, short circuit and overload-protected.
  • LED-Display: Battery empty, Solar charging and NiCd/NimH-Charging
  • Optional: Data-Cable for Update of the Software and Source-Code with Compiler

more Information and Downloads



Price-List and Calculation-Sheet

Calculation for a Solar Home-System and List of Items

Hints for Solar Technology