li ion solar charge controller wiring diagram

Solar Panel Charge Controller Wiring Diagram & Steps

Solar Panel Charge Controller Wiring Intro

Solar Panel Charge Controller Wiring Diagram and Step-by-Step Installation Guide for Off-Grid Solar Power System Wiring.

Connecting the solar panel charge controller (MPPT or PWM are the same), solar battery and PV array in the right way is the essential work before enjoying the solar energy.

Solar Panel Charge Controller Wiring Diagram


Solar Power System Wiring Steps

Broadly, there are 5 steps for you to wiring the solar power system

    • Connect the battery
    • Connect the load
    • Connect the PV array
    • Check the connection
    • Check the Power

Let’s Connect the solar energy system one by one.

Step 1: Connect the Battery

Note: Fire and explosion may occur if the positive and negative terminals of the battery are short-circuited.

Make sure the battery voltage is higher than 6V if system is 12V, then start the controller before connecting the battery to the solar system.

Make sure the battery voltage is not lower than 18V if the system is 24V.

When the controller is first started, the battery system voltage detection is an automatic process.

When installing the fuse, the maximum distance between the fuse and the positive battery terminal should be >150 mm. Before turning on the fuse, please confirm that the cable is connected correctly.

Step 2: Connect the load

The load terminal of the solar controller can be connected to a DC power source that has the same operating voltage as the rated voltage of the battery, and the controller will supply power to the load at the battery voltage.

Connect the load’s positive and negative terminals to the controller’s load terminals.

There may be voltage on the load side, be careful not to short circuit the load during connection.

A fuse should be connected to the positive or negative wire of the load. Do not connect the fuse during installation.

After installation, confirm that the fuse is properly connected.

Each load circuit has a separate fuse and all load currents cannot exceed the rated current of the controller when the load is connected through the panel.

Step 3: Connect the PV array

WARNING: Risk of Electrical Shock! Photovoltaic arrays can generate very high voltages and care must be taken when wiring to avoid electric shock.

Connect the solar panel to the solar controller, which is available in 12V, 24V and 48V, noting that the rated voltage of the solar controller should be lower than the input voltage of the solar panel.

The solar module voltage in the system should not be lower than the system voltage.

Step 4: Check Connections

Check all connections again to see if the positive and negative terminals of each terminal are correct right. and the 6 terminal wiring should all be tightened.

Step 5: Confirm Power On

When the battery is supplying power to the controller, the controller will start up, the battery LED on the controller will then light up, check the status of the light and make sure that the light is normal.

Solar Panel Charge Controller Wiring Diagram infographic
Solar Panel Charge Controller Wiring Diagram infographic

Boost Solar Charge Controller wiring diagram this boost charge controller lets you charge a wide range of 36V-88V battery systems with 18V and 36V Panels. and contrary to the typical charge controller, this type of booster must connect conversely,  connect the solar panel to the controller first. buck-boost-solar-charge-controller-wiring-diagram Multiple Solar Charge Controller wiring diagram In a large PV system, you may need to connect multiple solar controllers in parallel to charge the battery bank at the same time. Below is the wiring diagram for a parallel 60A 48V solar controller stacks. Srne-Mppt-60a-12v-24v-36v-48v-stack wiring


Wiring sequence: first connect the battery, set the working mode of the load via solar charge controller, connect the solar panel, connect the load in the last, when disconnecting the solar power system, disconnect in the reverse order.

Quick Takeaways

This is the simple steps to wiring the whole solar system, broadly there are 5 steps for you to wire solar system.

Connect the solar battery

Always connect the solar battery first when hooking the solar power system.

Connect the load

connect the load to the solar charge controller load port

Connect the Solar Array

connect the solar array after the battery has been connected

Connect the inverter to solar battery

the inverter is only allowed to connect to the solar battery.

Useful Topics:

MPPT vs PWM Solar Charge Controller Comparison

MPPT Solar charge controller user manual

Does a Solar Charge Controller drain the battery?

Will a Solar Charge controller overcharge the battery?


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