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
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.
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.
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.
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.
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.
- 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.
- To measure each phase’s power in a three-phase system, one must install three CT clamps in each step.
Step3. Finding the right CAN communication balance
- 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.
- 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.
Step4. Set up the monitoring system
Step5. Run the system
- Turn on the main unit and sub-units and verify that all EPS outputs are operational.
- 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.
| LCD Display | Description | Troubleshooting |
|---|---|---|
| Error Code:008Error: 100 | CAN communicationFault in Parallel System |
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| Error Code:009Error: 200 | Primary Inverter Lost inParallel System |
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| Error Code:008,009Error: 300 | Compound error codes | Please follow the guidance above |
| Error Code:010Error: 400 | Muti Primary unit inParallel System | There 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: 800 | AC input Inconsistent inParallel System | We 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: 1000 | UPS output short circuit | You can turn off the solar panel to inverter and check the UPS output for a short circuit with a multimeter. |
| Error Code:013Error: 2000 | UPS output currentreversed | Please 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: 8000 | Phase Error in 3 PhaseSystem |
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