A PWM (pulse width modulation) controller can be thought of as an (electronic) switch between the solar panels and the battery:
The switch is ON when the charger mode is in bulk charge mode
The switch is “flicked” ON and OFF as needed (pulse width modulated) to hold the battery voltage at the absorption voltage
The switch is OFF at the end of absorption while the battery voltage drops to the float voltage
The switch is once again “flicked” ON and OFF as needed (pulse width modulated) to hold the battery voltage at the float voltage
Note that when the switch is OFF the panel voltage will be at the open circuit voltage (Voc) and when the switch is ON the panel voltage will be at the battery voltage + voltage drops between the panel and the controller.
Sorry, there are no products in this collection
Choosing a selection results in a full page refresh.
Press the space key then arrow keys to make a selection.
Use left/right arrows to navigate the slideshow or swipe left/right if using a mobile device