Offgridtec Solar Charge Controllers – MPPT & PWM for Your Solar System

We offer Offgridtec solar charge controllers in three models: the affordable PWM Pro series, the more efficient MPPT PRO-X series, and the MPPT Pro Duo for two independent battery circuits. All models are microprocessor-controlled and reliably protect your battery from overcharging.

PWM Pro Charge Controller – the Affordable Entry-Level Option

The Offgridtec PWM Pro charge controller is available in 10A, 20A, 30A, and 45A ratings and automatically detects whether your system runs on 12V or 24V. An integrated USB port also allows you to charge small devices such as smartphones or power banks directly.

MPPT PRO-X – Get More Output from Your Solar Panels

The MPPT PRO-X uses Maximum Power Point Tracking (MPPT) technology to extract significantly more energy from your solar panels than a traditional PWM controller. The 10A and 20A versions operate at 12V or 24V, while the larger 30A and 40A models also support 36V and 48V for larger systems with higher power requirements.

MPPT Pro Duo – for two battery circuits

The 30A MPPT Pro Duo is specifically designed for mobile use and charges two independent battery circuits simultaneously—which is handy if, for example, you want to power your starter battery and onboard battery separately.

• What is the difference between PWM and MPPT charge controllers?

  PWM controllers simply pass the solar current through, while MPPT controllers dynamically adjust the voltage and current to the optimal operating point of your solar module, thereby maximizing energy yield.

• How much more energy does an MPPT charge controller provide compared to a PWM controller?

  Depending on conditions, an MPPT controller can extract up to 30% more energy from your solar module, especially in cool temperatures or when there’s a larger difference between the module and battery voltages.

• When should I use the 36V/48V version of the MPPT PRO-X?

  These versions are useful if your battery system operates at 36V or 48V, such as in larger residential installations or systems with higher energy demands.

• What is the MPPT Pro Duo with two battery circuits used for?

  It’s ideal if you want to charge two separate batteries at the same time, such as a starter battery and a service battery in a RV or boat.

• What is the purpose of the USB port on the PWM Pro charge controller?

  It allows you to charge small devices such as smartphones or power banks directly from the charge controller without having to connect any additional accessories.

• How does the charge controller automatically detect 12V or 24V?

  The built-in microprocessor measures the system voltage upon connection and automatically adjusts to it—no manual switching is necessary.

• What kind of charge controller do I need for my solar panel?

  As a rule of thumb: Your controller’s maximum charge current should be higher than the short-circuit current of your solar modules. For larger module areas or higher power requirements, the MPPT version is usually the better choice.