Those who want to buy solar panels can come and take a look. When using solar panels to charge your home appliances, you will need to use a solar charge controller. There are two different types of solar controllers: MPPT(Maximum Power Point Tracking) and PWM(Pulse-Width Modulation), and the POWERWIN MPPT is one of the best products in the market, so you should consider buying it.
What is the difference between the two of them, both being solar charge controllers?
The two most common charge controllers used in today's solar power systems are pulse width modulation (PWM) and maximum power point tracking (MPPT). Both adjust the charge rate based on the battery's charge level to allow charging close to the battery's maximum capacity, and monitor battery temperature to prevent overheating.
MPPT VS PWM
► Temperature conditions
MPPT controllers are better suited for cooler conditions. This is because under standard test conditions (STC is 25C°), the solar panel operates at about 17V at the peak power point, while the battery voltage is about 13.5V. The MPPT controller is able to capture excess module voltage to charge the battery. Therefore, MPPT controllers can produce 20 – 25% more power than PWM controllers in cool conditions.
In contrast, a PWM controller cannot capture excess voltage because the technology of pulse width modulation charges the battery at the same voltage.
► Array load ratio
In situations where the solar array draws more power from the battery relative to the load, the battery will remain close to a fully charged state. PWM controllers can effectively maintain the system without the added expense of MPPT controllers.
►Solar module types
Standalone off-grid solar modules are typically 36-cell modules and are compatible with PWM and MPPT technologies. Some grid-tied solar modules currently on the market are not the traditional 36-cell modules used in off-grid power systems. For example, the voltage of a 60-cell 250W panel is too high for 12V battery charging and too low for 24V battery charging. As a result, MPPT technology optimizes the energy conversion process, ensuring that the battery receives the maximum available power from the solar panels, while PWM technology operates at a fixed voltage, potentially leading to power loss and inefficient charging.
POWERWIN MPPT has the function of automatically tracking solar power generation and is compatible with lightweight design. Its voltage range is 12V/24V, suitable for most batteries. POWERWIN MPPT also has DC input and output and dual USB output ports. There is also an LCD display to show the status at a glance.
Those who want to buy solar panels must have a great need for solar controllers. And the distinction between the two, MPPT and PWM, is still confusing compared to everyone else. Through this article, you can attain more knowledge of two solar controllers, and also get few tips for buying this product.