The modular structure provides redundancy for better reliability. Even if a module fails, other modules continue charging the batteries. The charger is protected against abnormal operating conditions including low/high supply voltage, overload, short circuit and high temperature. In case of overheating, the charger will automatically reduce its output current and continue normal operation. The cooling is performed with internal fan. Thanks to the high efficiency, the need for fan is minimized. The charge control module starts and stops the charge and provides the required charging characteristic. The programming is also performed through this unit. With the optional GSM modem, the charge control module may be remotely monitored and controlled. The mobile phone APP is also available free of charge.