7 Best PWM Solar Charge Controllers 2024

Looking for a way to power your off-grid lifestyle without having to worry whether your batteries are coping with the load? Say hello to PWM solar charge controllers! These handy devices ensure that your solar panels are charging your batteries safely and efficiently.

In this article, we explore the world of PWM solar charge controllers, and look at the best solar charge controllers available on the market, providing helpful tips for choosing the right one for your needs. So, if you want to maximize the power of your solar system, keep reading!

What is a PWM Solar Charge Controller?

Before we dive into the best solar charge controllers, let’s first define what PWM means. PWM stands for Pulse Width Modulation, which is a technique used to regulate the charging current from your solar panel to your battery. **This post contains affiliate links and I will be compensated if you make a purchase after clicking on my links but this does not affect the price you pay.

The PWM charge controller sends a series of pulses to the battery, which vary in width and frequency, effectively controlling the flow of electricity.

Why Is This Charge Controller Called A Pulse Width Modulation?

Fun fact as to why this solar charge controller is called a pulse width modulation (PWM).

Remember that the only thing that the PWM charge controller does is connect or disconnects the circuit between the solar panel and your battery.

Once the voltage has risen to the level you configured in the charge controller it will then regulate the voltage, it will avoid going any higher by just disconnecting the circuit between the solar panel and the battery than waiting for a little bit and then just reconnecting again and then repeating this process very quickly.

As the controller opens and closes circuits this results in jumps in voltages which are referred to as pulses. The controller regulates the amount of time that it has the connection open or closed which is referred to as the pulse width.

Image to Illustrate the Pulse Width

X axis displays the Voltage and Y axis, the Time (data is for reference only, it is not real data)

Why Choose a PWM Solar Charge Controller?

When it comes to charge controllers, there are two two types of solar charge controllers on the market: PWM and MPPT. While MPPT controllers are generally more efficient and can convert more of the energy from your solar panel system into usable power than PWM controllers, they also tend to be more expensive. So, why choose a PWM solar charge controller over an MPPT solar charge controller?

PWM charge controllers are a more affordable option for those with small-scale off-grid solar power systems. If you’re not planning on expanding your solar setup or have limited power needs, investing in the dearer MPPT charge controller may not be worth it.

PWM models are relatively simpler in design and easier to install. They don’t require as much programming or as many connections as MPPT charge controllers, making them a more user-friendly option for those new to solar systems.

PWM charge controllers are reliable and durable. They have been around for a while now and have a proven track record of effectively charging batteries and regulating solar power that your solar panels produce.

Overall, if you have a smaller off grid solar system and are looking for a cost-effective, user-friendly, and reliable way to charge your batteries, a PWM solar charge controller is a great choice.

How to Choose the Right PWM Solar Charge Controller

When choosing the best solar charge controller, there are a few key factors to consider:

• Amperage – The amperage or amp rating of your solar charge controller should match the amperage rating of your solar panels. If your solar panels have an output of 100W at 12V, you’ll need a 10A solar charge controller.  Refer to this table for guidance on pwm controller size.
• Voltage – Your solar charge controller should be compatible with your battery voltage. If you have a 12V battery, you’ll need a 12V solar charge controller.
• Efficiency – Look for a solar charge controller with a high efficiency rating. This will ensure that you get the most out of your solar panels and battery.
• Features – Consider the features that are important to you, such as overcharging protection, temperature compensation, and LCD displays.
• Budget – Finally, consider your budget. PWM charge controllers are generally less expensive than MPPT charge controllers, but you still want to make sure you’re getting a reliable and efficient device.

Selection of the Best PWM Solar Charge Controllers

The key to a successful solar power system lies in choosing the best solar controller.

These clever little devices ensure that your batteries are charged efficiently, and your solar panels are working to their full potential. But with so many different pwm solar charge controllers available, it can be hard to know which one to choose as the best controller for your system. 

The following selection gives you everything you need to know from the number of amps to the type of battery and battery voltage required, to enable you to make an informed decision. 

Conclusion

In conclusion, a PWM controller is an essential component of any solar system. While MPPT charge controllers are more efficient, PWM charge controllers are a more affordable and practical option for small-scale solar systems.

When choosing the best solar charge controller, it’s important to consider factors such as amperage, voltage, efficiency, features, and budget. The top seven best PWM solar charge controllers on the market, including the Renogy Wanderer 10A and 30A and the Renogy Voyager 20A, Morningstar Prostar, Huine 20A , BogueRV 30A, and HQST 30A PWM Solar Charge Controller, are all great options to choose from.

Investing in a quality PWM solar charge controller is a smart move that can help you get the most out of your solar system.

With the right charge controller, you can rest assured that your battery is being charged safely and efficiently, and that your solar panels are working to their full potential.

So, take your time to research and choose the best PWM solar charge controller that suits your specific needs and preferences.