Key considerations when choosing a PWM solar controller include:
Maximum power: Generally speaking, the maximum operating power of the controller should be greater than or equal to the maximum power of the solar panel to ensure that the controller can handle the maximum current provided by the solar panel.
Voltage and Current Ratings: When selecting a controller, make sure its voltage and current ratings match those of your solar panels and load equipment.
Capacity: Capacity refers to the amount of current the controller can handle, usually measured in Ampere Hours (Ah). In order to avoid overcharging or overdischarging the battery, the appropriate capacity can be selected based on the power of the solar panel and the requirements of the load equipment.
Display functions: Many controllers provide display functions such as current, voltage and remaining battery capacity. These functions can help you better monitor the usage of solar panels and load equipment.
Automatic protection function: Choose a controller with automatic protection functions, such as overcharge, over-discharge, short circuit and reverse connection protection, which can protect the battery and load equipment from damage.
Scalability: If you plan to expand your solar system, you may want to choose a controller that can integrate with other controllers and other electronic devices.
In summary, there are several factors to consider when choosing a PWM solar controller to ensure that it can meet the power needs of the system and provide stable power output.