Offgridtec PWM Pro Charge Controller 12V/24V 45A USB

The Offgridtec PWM 12/24-45 solar charge controller (MPN: 1-01-010925) is a microprocessor-controlled charge controller with a maximum charging current of 45 A for 12-V and 24-V battery systems. With its three-stage PWM charge control, it enables gentle and efficient charging of AGM, GEL, and flooded lead-acid batteries. It is suitable for solar systems with up to 590 W of PV power at 12 V and 1,180 W at 24 V. The integrated LCD display, two USB ports, and a configurable load output enable convenient operation and versatile applications. Comprehensive protection functions ensure reliable operation.

Offgridtec PWM 12/24-45 Solar Charge Controller for 12-V and 24-V Systems

• 45 A maximum charging current for 12-V and 24-V batteries
• Up to 590 W PV power at 12 V and 1,180 W at 24 V
• Three-stage PWM charge control for gentle charging
• Suitable for AGM, GEL, and flooded lead-acid batteries
• LCD display with numerous indicators, including a kWh meter
• Easy operation via two buttons
• Two USB ports with a maximum output current of 2.4 A
• Configurable load output, for example, for lighting control
• Temperature-compensated charging with optional temperature sensor

Three-stage PWM charge control for gentle battery charging

The microprocessor-controlled PWM charge control adjusts the charging process to the battery’s state of charge. As the battery charges, the charging voltage is gradually reduced to limit gassing and overheating. This ensures the battery is charged gently until it is fully charged. With an optional temperature sensor, the battery temperature can also be taken into account during charge control.

LCD Display, USB Ports, and Configurable Load Output

The integrated LCD display shows important operating and charging information, including a kWh meter. The unit is operated via two buttons located directly on the device. Two USB ports allow compatible USB devices to be powered with a maximum output current of 2.4 A. The configurable load output offers various operating modes, such as for automatic lighting control.

Integrated protection functions for safe operation

The PWM 12/24-45 features several protection mechanisms for the controller, solar system, and connected loads:

• PV short-circuit protection with automatic shutdown
• PV reverse polarity protection in case of incorrect connection
• Overload protection with shutdown when the permissible load current is exceeded by 5%
• Overheating protection with shutdown above 85 °C and restart below 70 °C
• Short-circuit protection at the load output

Notes on PV Input Voltage

The maximum permissible PV open-circuit voltage (Voc) is 50 V. For 12-V battery systems, a PV open-circuit voltage of approximately 22 V is recommended to achieve the highest possible efficiency. At higher PV voltages, the efficiency of the PWM charge controller may decrease.

Technical Specifications

• Controller Type: PWM Solar Charge Controller
• Manufacturer part number: 1-01-010925
• Battery system voltage: 12 V / 24 V
• Maximum charging current: 45 A
• Maximum PV power at 12 V: 590 W
• Maximum PV power at 24 V: 1,180 W
• Maximum PV open-circuit voltage (Voc): 50 V
• Charging method: three-stage PWM control
• Supported battery types: AGM, GEL, flooded lead-acid
• Display: LCD with kWh counter
• Controls: 2 buttons
• USB ports: 2 × USB, maximum 2.4 A
• Load output: configurable
• Temperature compensation: with optional temperature sensor

Package Contents

1 × Offgridtec PWM 12/24-45 Solar Charge Controller 45 A with LCD
1 × User Manual (German)