PWM vs. MPPT Solar Charge Controllers
When it comes to solar charge controllers for campers, there are two main types: PWM (Pulse Width Modulation) and MPPT (Maximum Power Point Tracking). Both types of controllers have their own advantages and disadvantages, so it’s important to choose the right one for your needs.
PWM Solar Charge Controllers
PWM solar charge controllers were the most common type of controller on the market. They remain relatively inexpensive and easy to install. PWM controllers work by “pulsing” current to the battery, which helps to keep the battery charged at a constant voltage.
The main advantage of PWM controllers is their low cost. They are also relatively easy to install, which may make them an attractive option for DIY converters. However, PWM controllers are not as efficient as MPPT controllers. This is because PWM controllers cannot convert the excess voltage from the solar panels into amperage, which can lead to longer charging times.
MPPT Solar Charge Controllers
MPPT solar charge controllers are more expensive than PWM controllers, but they are also more efficient. MPPT controllers work by “tracking” the maximum power point (MPP) of the solar panels. The MPP is the point at which the solar panels are producing the most power. By tracking the MPP, MPPT controllers can convert more of the solar power into amperage, which can lead to faster charging times.
The main advantage of MPPT controllers is their efficiency. They can convert up to 98% of the solar power into amperage, which can lead to significant savings in the long run. MPPT controllers are also a good option for larger solar systems. However, MPPT controllers are more expensive than PWM controllers and they can be more difficult to install due to potentially complex configuration options however, as the technology continues to mature they are becoming simpler to install and configure.
Choosing the Right Solar Charge Controller
The best way to choose the right solar charge controller is to consider your needs and budget. If you are looking for a low-cost, easy-to-install controller, then a PWM controller could possibly be a good option for you. However, if you are looking for a more efficient controller that can handle a larger solar system, then an MPPT controller will almost always be a better choice.
Here is a table that summarises the key differences between PWM and MPPT solar charge controllers:
Feature PWM Charge Controller MPPT Charge Controller
Cost Less expensive Usually more costly
Installation Simple Often more complex
Efficiency Less efficient More efficient
Suitable for Small solar systems Larger solar systems
Conclusion
When choosing a solar charge controller, it is important to consider your needs and budget.
If you are looking for a low-cost, easy-to-install controller, then a PWM controller may be a good option for you.
However, if you are looking for a more efficient controller that can handle a larger solar system, then an MPPT controller may be a better choice.
For further advice or for the design, supply, and installation of a solar system, please contact us and we’d be delighted to help.