Hello everyone, this is Chen Fashu, an I-Panda engineer. Here is a summary of some of the questions that answer our customers' charging current requirements for the controller at work. I hope to explain these practical problems through me to help.

Q1: How do I know if I got the real MPPT solar charge controller? Why is the charging current small for all the time?
A: The easiest way to check if it is a true MPPT solar controller is to check if the output current is greater than the large input current. At the same time, you can check if the PV voltage can track the voltage at the maximum power point. You can also check the conversion efficiency by checking.
Q2: Sometimes the controller's charging current is smaller than the PWM or other suppliers. The controller is small. Why?
A: First, the function of the MPPT solar energy charging controller makes full use of solar power to generate electricity when the battery is empty and the battery is charged with high efficiency. Second, charge the battery to charge at a low current when the battery is almost fully or fully charged. So it protects the battery and extends the life of the battery. In this case, it does not charge the battery, even if the solar radiation is very powerful.
Ordinary PWM controllers are not that smart as one of the MPPTs. For the PWM controller, it will still charge the battery large even if the battery is fully charged. Even some MPPT controllers from other vendors will be the same. If you want to compare different models between different vendors, please do this when the battery is empty. Charging The current of the MPPT controller is not always greater than PWM 1.
Q3: I have a 48V battery system and a 2000W solar panel, but the maximum charging current is only 20A and the maximum charging power is about 1000W. What is wrong?
A: Please confirm the following questions:
1. Please check if the solar power panel is sufficient. In addition, the power of the solar panel will be reduced after use.
Produced by solar energy 2. Maximum power panel is the maximum radiation intensity, how about the radiation intensity at that moment?
3. Please check if the battery is fully charged at the moment. What is the charging mode? Constant current, constant voltage or floating charge? If the battery is fully charged, the charging current will become smaller and smaller over time. The maximum charging current of the MPPT controller is carried out under constant current conditions. Remember that the battery has been used safely and the battery life is important. So, when the battery is fully charged, our goal is to protect the battery from small charging currents, whether it is solar radiation.
Q4. The charge current of my battery is very small and quickly from a large charging current. When we restart it, it will be the same, what is going on?
1. If the quality of the battery is good, the battery current will increase and the charging current will become smaller and gradually. Otherwise, the battery can be easily damaged.
Damaged battery 2. Features are very fast to get fully charged. At the same time, it will get very fast. Therefore, please check if the battery is damaged. Here is the comparison of the images under the same conditions for a good and damaged battery, the answer you get from the picture?

3. When the solar controller is restarted, it will automatically detect the status of the battery and resume the job from CC, then CF. So, when you reboot, it will be in battery CC mode and charging current will be very large. If the battery is fully charged, it will move quickly to the next step and get back to the state before restarting.