How far from the solar panel is the charge controller still effective? 

We all know that a solar system requires solar panels, charge controllers, batteries, inverters. To ensure that the current from the solar cells flows into the inverter at a constant rate, we need to install a charge controller between the solar panels and the inverter.

What are the different types of solar controllers?
Solar charge controllers are mainly divided into MPPT and PWM solar charge controllers. The difference lies in the efficiency, and the efficiency of MPPT is higher than that of PWM. But apart from the efficiency of the charge controller itself, how far is the solar panel from the MPPT solar charge controller, will this affect the product efficiency?

What is the maximum distance between solar panel and charge controller?

The maximum distance between the solar panel and the battery should be 20 to 30 feet.

The charge controller is best placed close to the solar panel, as the cable itself can get lost.

If the line is too long, the loss of the cable itself will affect the conversion efficiency of the controller to light energy.

How do I choose the right cable?

In the process of installing an off-grid solar power system, using incorrect cable specifications and installation methods may lead to low system efficiency, abnormal system operation, and even damage to solar controllers, overheating of batteries and other serious consequences.

If you are designing a system, you need to calculate how much current the panels can provide based on the system's solar panel voltage and power, and then choose the appropriate cable size.Manufacturers provide specifications for the current drop over a given distance for different size cables, you will need to refer to these to find the minimum.

1. Cable specification
The cables used in general photovoltaic systems are special insulated multi-core pure copper cables. Commonly used specifications are 2mm2, 4mm2, 6mm2, 10mm2... The specific wire size should be determined according to the maximum charging current of the controller. Cables with too small a diameter can cause increased losses, overheating and even fire.
 
2. Cable length

When connecting solar panels, batteries, and load controllers, the shorter the better. The shorter the cable, the smaller the line loss and the higher the charging efficiency. If the cable connecting the battery to the controller is too long, the voltage drop can be significant. As a result, the charging parameters of the controller are inaccurate, and the battery cannot be fully charged. If the solar panel cable is too long, the charging current will be reduced, affecting the charging efficiency.