Solar Charge Controller

The Solar Charge Controller, which we offer, comes with the Microcontroller technology. This Solar Charge Controller is an advanced maximum power point tracking (MPPT) battery charger for off-grid photovoltaic (PV) systems. The Solar Charge Controller features a smart tracking algorithm that maximizes the energy harvest from the PV and also provides load control to prevent over discharge of the battery.

The GEESYS MPPT Solar Charge Controller is well suited for both professional and consumer PV applications, including automatic lighting control. This Solar Charge ControllerĂ¢€™s charging process has been optimized for long battery life and improved system performance. This Solar Charge Controller is epoxy encapsulated for environmental protection, may be adjusted by the user via four settings switches or connection to a personal computer, and has an optional remote meter and battery temperature sensor.

GEESYS Solar Charge Controllers
  • Solar PWM Charge Controllers
  • Solar MBPT Charge Controllers
  • Solar-Grid Interactive Charge Controllers

An Introduction
Solar Charge Controllers
The function of a MPPT is analogous to the transmission in a car. When the transmission is in the wrong gear, the wheels do not receive maximum power. That's because the engine is running either slower or faster than its ideal speed range. The purpose of the transmission is to couple the engine to the wheels, in a way that lets the engine run in a favorable speed range in spite of varying acceleration and terrain Let's compare a PV module to a car engine. Its voltage is analogous to engine speed. It is ideal voltage is that at which it can put out maximum power. This is called its maximum power point. (It's also called peak power voltage, abbreviated Vpp). Vpp varies with sunlight intensity and with solar cell temperature. The voltage of the battery is analogous to the speed of the car's wheels. It varies with battery state of charge, and with the loads on the system (any appliances and lights that may be on). For a 12V system, it varies from about 11 to 14.5V. In order to charge a battery (increase its voltage), the PV module must apply a voltage that is higher than that of the battery; if the PV module's Vpp is just slightly below the battery voltage, then the current drops nearly to zero (like an engine turning slower than the wheels). So, to play it safe, typical PV modules are made with a Vpp of around 17V when measured at a cell temperature of 25'C. They do that because it will drop to around 15V on a very hot day. However, on a very cold day, it can rise to 18V!

  • MPPT controllers offer a potential increase in charging efficiency up to 30% (Maximizes energy harvest)
  • These controllers also offer the potential ability to have an array with higher input voltage than the battery bank
  • You can get sizes up to 80 Amps
  • MPPT controller warranties are typically longer than PWM units
  • MPPT offer great flexibility for system growth
  • Longer Battery life
  • Extensive electronic Protections
  • Fully adjustable and highly reliable
  • MCU based buck converter 12/24Volt 20/40A.
  • MPPT Technology, efficiency improved by more than 20%.
  • First in its class LCD with Power and Energy measurement
  • Menu settable configuration using 2x16 LCD and 3 push buttons
  • Menu settable Battery voltage, battery current, Float Voltage and Float Current
  • Three stage Charging
  • Over voltage/Over current protection
  • Optional relays to control Mains charger and Inverter
  • Lower System Cost


Product Series GEESYS - M122448
Battery Voltage 12V; 24V; 48V;
Max. Efficiency > 98%
Own Power Consumption < 30mA
Rated Charging Current 10A; 20A; 30A; 40A; 50A; 60A;
Rated Load Current 10A; 20A; 30A; 40A; 50A; 60A;
Voltage Drop of Charge Circuit < 0.40V
Voltage Drop of Load Circuit < 0.35V
Equalization Charge Voltage 14.6V/29.2V/58.4V (Used only when battery is deep discharged)
Buck Charge Voltage 14.2V/28.4V/56.8V
Float Charge Voltage 13.8V/27.2V/54.4V
Temperature Compensation -3mv/'C/2V
Control Mode PWM/MPPT
Permitted Operation Temperature Range -20'C ~ +55'C
Dimensions L x B x H in mm


  • RV, boat, and off-the-grid home battery storage systems
  • DC Home Lighting System
  • AC Home Lighting System