The need for 230VAC power supply and battery maintenance in buses and coaches is greater than ever. The DEFA PlugIn system offers the most flexible and reliable solutions for your needs.

MultiCharger 2x35A onboard battery charger

Reliable quality

Our products are designed to handle extreme conditions and are rigorously tested to ensure that they can handle heavy use over time.

Schematic view of the DEFA PlugIn system

A flexible system

Customize and update your system according to your needs. Our PlugIn system provides complete solutions and simple installation.

Coach on sunny rural road

Less emissions and waste

Proper battery maintenance helps reduce fuel consumption and emissions and extends the life expectancy of the battery.

Smiling male coach passanger is working on his laptop while listening to music.

Power for all

Today’s coach passengers expect to be able to charge their computers and phones, watch TV and much more. The DEFA PlugIn-system provides reliable access to 230VAC for facilities and individual passenger needs.

Bus and warning triangle

Reliability is everything

Delays or unscheduled stops caused by a flat battery may lead to large fines and many frustrated passengers. Installing an onboard charger is the easiest and most reliable way to ensure optimal battery performance and a safe start to every route.

Why choose the DEFA PlugIn System?

Overview of the DEFA PlugIn system and its possible components: Inverter, Onboard charger, cables and connectors, remote control panel, engine heater and interior heater.

What is the DEFA PlugIn System?

The DEFA PlugIn system is a modular system for power supply, charging and preheating. We have perfected our solutions over many years, and we are currently the leading provider of power supply, charging and preheating solutions for vehicles of all sizes and specifications.

Picture from production line in the cutting-edge DEFA factory in Wuxi, China

High-quality products

Research, quality control, and close cooperation with our customers are the central tenets of our philosophy. Our research and development take place in our own factories, and our products undergo rigorous testing to ensure that they meet the most stringent requirements. As a result, customers choose our products for the most demanding applications, such as in emergency vehicles.

PlugIn connector closeup

The superior PlugIn connector

The DEFA PlugIn connector is the foundation of our system. It’s carefully designed to guarantee safe and effective power transfer and to prevent moisture and dirt from infiltrating the connection. Installation is quick, easy and safe – in fact, no license is required.

Schematic view of the DEFA PlugIn system

An expandable system

The PlugIn system is modular and can be supplemented with additional components if the need arises. Simple and safe PlugIn connections also makes it easy to upgrade or replace components. This means that you get a future proof system that you can adapt to changed requirements.

Busses and battery charger

Intelligent chargers

Intelligent battery chargers help maintain battery performance. Our chargers analyze the batteries and provide optimal, temperature adjusted charging curves. This extends battery lifetimes and minimizes waste. Our chargers are compact and water, dust and shock-resistant.

Inverter in front of a row of coaches

Highly efficient inverters

An inverter provides access to 230VAC on the bus, making it possible to charge or operate most types of electrical equipment. Our inverters meet the highest standards of quality and safety. They are designed to withstand heavy use and provide the best possible voltage at all times. You can expand the system with several outlets at any time.

For the installer

Mechanic working in engine compartment

Quick and easy installation

Choosing a system that is easy to install and that can handle heavy use in extreme conditions is the best way to ensure good profitability and satisfied customers. The DEFA PlugIn system contributes to both. Our products are compact and easy to mount, even when space is limited. Remote control panels make the installation even more flexible since inverters and chargers don’t need to be easily accessible for the user.

Schematic view of the DEFA PlugIn system

An expandable system

The PlugIn system makes it easy to customize and expand the system in response to particular needs. Upgrading an inverter, replacing a charger or integrating a full preheating requires less time and provides better results than with any other solution.