How to Connect Solar Panel to Battery and Inverter

If you want to save on the labor costs of installing a solar system. It’s important to understand how solar panels are wired. A proper wiring process will directly affect the performance of the inverter in the future. Avoid future system failures due to incorrect wiring. If a failure occurs because of this, we may have to pay expensive repair bills.

Series vs. parallel connection difference?

The charge controller is the most important component in solar panel wiring. Charge controllers with maximum power point tracking (MPPT) are used with solar panels in series. A pulse width modulated (PWM) charge controller is employed for parallel-linked solar panels.The solar panels in series work the same way that the electronics connected in series do. If one of the panels connected in series fails, the complete circuit will fail. Furthermore, a faulty panel or a loose wire in the parallel circuit will not affect the remaining solar panels.The type of solar panel inverter for home used today determines how solar panels are wired. We will discuss the difference between parallel and solar panels in series connections.

Hybrid Parallel Model Installation Guidance

Single Phase Parallel System Wiring

Installing a solar panel inverter for home that enables „parallel connection“ allows you to link numerous inverters together. You can acquire a bigger backup power supply this way. Tell your dealer if you require a parallel unit because the parallel model differs from the conventional model. Then we’ll look at how to create a parallel system.

Step1. Single unit installation

Make sure the distance between each inverter satisfies the user manual’s criteria before installing it.

Step2. Parallel system wiring

If you’re paralleling your system as a single-phase system, double-check that each unit’s L and N wires (AC port and EPS port) are connected correctly. Please use a multimeter to double-check that each device’s L wires are connected. Make sure that the L wire of one inverter does not link to the N wire of another solar panel inverter for home.

Wiring suggestions for parallel systems are as follows for safety and cost: In this illustration, three single-phase inverters are linked in parallel. Note that just one CT clamp is required for the CT clamp in a single-phase parallel system. Any solar panel inverter for home in the system can be connected to the CT clamp RJ45 terminal.

The suggested wiring:

Tips: Copper wire 1 m㎡ safe current carrying capacity is 5 amps (within 20 meters distance)The PE line can chosen between 6~10 m㎡
2. The suggested wiring

Step3. Set up the parallel CAN communication balance resistance

Connects communication wires in parallel. Parallel connections are made through port 4.Switch 3 can use to balance the parallel communication resistors.If your system only has two inverters connected in parallel, you must enter all PIN codes for switch 3.

3. parallel CAN communication
If you have more than two inverters connected in parallel in your system. Then you only need to set the two inverters with the longest distance between them to the „on“ position and keep the others off.
4. parallel CAN communication
Please see the user manual for information on other ports.Please double-check the wiring for any errors.If the cable in the box isn’t long enough, please build your own using the diagram below.
5. user manual for information

Step4. Set up the monitor system and do settings

Connect the Wi-Fi dongle to the Internet and turn on the inverter’s electricity.Please use the vendor’s website or app to set one of them to „1-Phase Primary“ and the others to „Secondary.“Set the inverters to „1 phase primary“ for independent inverters.

6. monitor system
If required, enable „Standby Power“ as follows
7. Standby Power as follows

Please combine the solar panel inverters for home into one group in the monitoring system. This is convenient for you to see the whole system’s operation status easily.

8. monitoring system

Step5. Running the system

Check that all EPS outputs are normal after turning on the main unit and sub-units.Should turn all circuit breakers in the grid and the EPS load distribution boxes.

Three Phase System Wiring

Step1. Install each single inverter as a user manual

Three or more solar panel to inverters can produce a three-phase system using some solar panel inverters for home that handle 3 phase systems.

Step2. Parallel connection

The wiring suggestions for parallel systems are as follows for safety and cost considerations.

  1. If the parallel solar inverters system is a three-phase system, make sure that each phase includes at least one inverter. Do not connect all EPS terminals in a three-phase system; otherwise, a short circuit will occur.
  2. To measure each phase’s power in a three-phase system, one must install three CT clamps in each step.
9. Parallel connection

Step3.  Finding the right CAN communication balance

  1. Join the parallel communication connection to the computer. Parallel connections are made through port 4. The parallel communication balancing resistor is set using Switch 3. If this three-phase system only has three inverters linked in parallel, switch 3 of No. 1, and No. 3 must be set to the „on“ position. No. 2 is turned off.
  2. If this three-phase system has more than three inverters linked in parallel, only the two farthest distant inverters need to be turned on. The others are still turned off.
10. Parallel connection

Step4. Set up the monitoring system

Step5. Run the system

  1. Turn on the main unit and sub-units and verify that all EPS outputs are operational.
  2. Turn on all circuit breakers at the grid and the EPS load distribution boxes.

Battery Connection in parallel solar inverters System

We provide two methods for connecting batteries in a parallel solar inverters system. You can connect all solar panel inverters for home to the same battery bank or each inverter to its battery bank.

The next thing I show is that each solar panel to inverters can link to its battery.

1. Battery Connection in Parallel System
If you connect a shared battery pack to numerous inverters, as demonstrated above. „Shared Batteries“ should enable.
12.Battery Connection in Parallel System
LCD DisplayDescriptionTroubleshooting
Error Code:008Error: 100CAN communicationFault in Parallel System
  1. Double-check the parallel communication cable’s connection.
  2. Verify that the DIP switches are properly configured.
  3. Please double-check the cable’s white label. The „Parallel-CAN“ cable is the correct parallel cable.
  4. Before extending or redoing the cable, double-check that the PIN code is correct.
Error Code:009Error: 200Primary Inverter Lost inParallel System
  1. Double-check whether one of the devices does set as a single-phase or 3 phase primary inverter.
  2. Double-check the connection between the central inverter and the cable.
Error Code:008,009Error: 300Compound error codesPlease follow the guidance above
Error Code:010Error: 400Muti Primary unit inParallel SystemThere are multiple master inverters in this parallel solar inverters system. Please choose one to serve as the primary inverter. There should not be more than one main inverter in the system.
Error Code:011Error: 800AC input Inconsistent inParallel SystemWe first check whether the AC input voltage of the inverter is consistent. Some of them, for example, is 230Vac while others are 0Vac.
Error Code:012Error: 1000UPS output short circuitYou can turn off the solar panel to inverter and check the UPS output for a short circuit with a multimeter.
Error Code:013Error: 2000UPS output currentreversedPlease double-check that the L and N lines are connected correctly. One of them is that if the LN wire can connect in the wrong direction, then the whole solar system will have a system failure.
Error Code:015Error: 8000Phase Error in 3 PhaseSystem
  1. Verify that the 1-phase primary inverter can configure as a 3-phase parallel connection.
  2. Check to see if one phase’s LN connection is inverted.
  3. Use the APP or the website to double-check if the detected phase is correct. Select „Clear Detected Phase“ and click Set if the detected step is wrong.
  4. If the issue persists after completing step 3, reset the central inverter.

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