How to choose the perfect solar charger controller for my solar system?

PWM vs MPPT charge controller: The two types of solar regulator/charge controller that are most frequently used in solar power systems are pulse width modulation (PWM) and maximum power point tracking (MPPT). Both adjust charging speed so that the battery can be charged more nearly to its maximum capacity. Also, they keep an eye on the battery's temperature to prevent it from overheating.

Choosing the right solar charge controllers depends on the size of the your solar system. In small solar systems where efficiency might not be the biggest concern, a PWM solar charge controller can deliver adequate performance. In large projects, however, the charge controllers' performance matters a lot.

MPPT charge controller vs PWM charge controller: Which ones are better?

MPPT solar power controllers are more efficient. In MPPT systems, the panel series are allowed to have higher voltage than batteries. This allows more flexibility for system expansion. Panel voltage and battery voltage should be matched in PWM systems. However, MPPT controllers are more expensive than PWM controllers. Therefore, the PWM is a good low-budget choice for smaller systems where the efficiency is not as essential, e.g trickle charging. But for solar systems with large power output, a MPPT solar charge controller is the clear choice.

What is a PWM charge controller？

Consider a PWM solar panel charge controller as an electronic switch that connects the batteries and solar panels: When the charger mode is set to bulk charge, the switch is ON. The current from the solar array tapers during PWM regulation in accordance with the battery's state and recharging requirements.

Check out the Renogy Webstore for a wide selection of PWM controller for 12V or 24V photovoltaic systems.

What is PWM control?

PWM is a modulation technique that produces pulses with adjustable widths to simulate the amplitude of an analog input signal. A high-amplitude signal causes the output switching transistor to be on more frequently, whereas a low-amplitude signal causes it to be off more frequently. The digital nature (completely on or off) of PWM circuit makes it less expensive to fabricate than an analog circuit that does not drifts over time.

How does PWM controllers work?

PWM regulates the amount of current that flows to a device by pulsating DC current and altering the length of time that each pulse remains "on".

Is a solar charger controller necessary for a solar panel system?

A solar panel charge controller is required for any off-grid solar-plus-storage system although they are not required for all solar panel systems. When panels are not in use, they keep batteries from overcharging and draining. A solar panel regulator is not necessary if your solar system is connected to the grid because any extra power will be redirected from your battery system and sent back to the grid.