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SolarEdge•10.0kW Hub

Analysis by Marcus & Team

SolarEdge 10.0kW Hub V-Line Sense Error

Troubleshooting the SolarEdge 10.0kW Hub V-Line Sense error. Learn possible causes, solutions, prevention, and safety measures for residential hybrid inverter systems.

Frequently Asked Questions

•What are the common causes of voltage imbalances in a residential AC grid?

Voltage imbalances can be caused by uneven distribution of loads on the different phases, faulty appliances, or issues with the utility transformer.

•How can I verify the accuracy of my multimeter?

A multimeter can be verified by comparing its readings to a known voltage source or by sending it to a calibration laboratory for testing.

•What type of surge protection devices are recommended for hybrid inverters?

Type 2 surge protection devices are typically recommended for hybrid inverters to protect against voltage surges from lightning or grid disturbances.

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Marcus leads the technical research department at Storage Faults. Together with a team of systems analysts, he specializes in translating complex solar storage error codes into actionable diagnostic steps for the US market.

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Critical Safety Precautions:

High voltages are present within the inverter and in the AC and DC wiring. Improper handling can result in serious injury or death. Always disconnect AC and DC power before working on the inverter. Only qualified electricians should perform troubleshooting and repair work. Follow all applicable NEC codes and manufacturer's safety guidelines. Arc flash hazards exist; wear appropriate PPE.

Solution:

1

*Safety First:** Disconnect AC power to the inverter by turning off the AC breaker feeding the inverter. Verify voltage is zero using a calibrated multimeter per NEC 705.12.
2

*DC Disconnect:** De-energize the DC input by switching off the DC disconnect switch. Use a calibrated multimeter to verify voltage is zero as per NEC 690.15.
3

*Visual inspection:** Carefully inspect the AC wiring connections at the inverter's input terminals for looseness, corrosion, or damage. Torque connections to manufacturer's specifications.
4

*Voltage Measurement:** Use a calibrated multimeter to measure the AC voltage on each phase (L1, L2, and L3 if applicable) at the inverter's input terminals. Compare these measurements to the grid voltage specified by the utility company.
5

*Grounding Check:** Verify proper grounding of the inverter and the AC wiring system. Use a multimeter to measure the resistance between the grounding electrode conductor and the inverter chassis. Resistance should be less than 1 ohm.
6

*Inverter Reset:** Attempt a soft reset of the inverter by cycling the AC and DC power. Refer to the SolarEdge system manual for the correct procedure.
7

*Firmware Update:** Check for and install any available firmware updates for the inverter. This may resolve software-related issues affecting the V-Line Sense circuit. Use SolarEdge SetApp.

Observed Symptoms:

The SolarEdge 10.0kW Hub hybrid inverter displays a "V-Line Sense" error. This indicates a problem with the inverter's ability to accurately sense the AC grid voltage on one or more phases. This may manifest as system shutdown, inability to export power to the grid, or failure to switch to battery backup during a grid outage.

Possible Causes:

Loose or corroded wiring connections at the AC input terminals of the inverter.
Failure of the voltage sensing circuitry within the inverter (e.g., damaged voltage divider resistors, operational amplifier failure).
Voltage imbalance or distortion on the AC grid supply.
Grounding issues affecting the accuracy of voltage measurements.
Software or firmware bug affecting the V-Line Sense algorithm.
Damage to the inverter due to a voltage surge or lightning strike.

Technical Overview:

The SolarEdge 10.0kW Hub is a hybrid inverter that manages power flow between solar panels, battery storage, and the AC grid. Accurate AC voltage sensing is crucial for grid synchronization, anti-islanding protection, and power factor correction. The V-Line Sense circuit monitors the voltage on each AC phase (L1, L2, and potentially L3 in a three-phase system). This data is used by the inverter's control system to ensure the output voltage and frequency match the grid, and to prevent the inverter from energizing the grid during an outage (anti-islanding). Failure of this circuit leads to safety and operational issues.

Preventative Care:

Regularly inspect AC and DC wiring connections for tightness and corrosion
Monitor the inverter's performance and error logs for any signs of voltage abnormalities
Perform regular firmware updates to ensure the inverter is running the latest software
Schedule licensed technician inspection every 3-5 years
Implement surge protection devices on both the AC and DC sides of the inverter to protect against voltage surges