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SolarEdge Error 32: AC Voltage Too Low During Heavy Load

Diagnose SolarEdge Error 32 'AC Voltage Too Low' during high power output. Causes, troubleshooting, solutions, and safety for residential hybrid inverter systems.

Frequently Asked Questions

•What is the typical AC voltage range for a residential solar inverter?

The typical AC voltage range is ±10% of the nominal voltage (e.g., 207-253V for a 230V system, 108-132V for a 120V system). Consult the inverter's datasheet for precise specifications.

•How can I safely disconnect the DC power from my solar panels?

Refer to the inverter's manual and follow the documented procedure for DC disconnect. Typically, this involves turning off the DC disconnect switch(es) located near the inverter and/or on the PV array. Always verify zero voltage before working on any wiring.

•What are the potential consequences of ignoring Error 32?

Ignoring Error 32 can lead to reduced inverter efficiency, system shutdown, and potential damage to the inverter or connected appliances. It can also indicate a serious underlying issue with the grid connection or electrical system.

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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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Technical Background:

The SolarEdge hybrid inverter converts DC power from solar panels and batteries into AC power for household use and grid export. It monitors grid voltage and frequency to synchronize its output. Error 32 arises when the grid voltage falls outside acceptable limits (typically ±10% of nominal, e.g., 207-253V for a 230V system). High loads, such as air conditioners or electric vehicle chargers, can excessively draw power, leading to voltage drops, especially at the service entrance or along shared distribution lines.

Symptoms:

SolarEdge hybrid inverter displays Error 32, indicating that the AC voltage supplied by the grid is dropping below the inverter's allowable operating range, particularly during periods of high power output from the solar array and/or battery discharge.

Possible Causes:

Insufficient grid voltage at the point of connection due to undersized transformer or long service cable.
Excessive household load exceeding the service panel's capacity.
Poor wiring connections (loose or corroded) in the AC distribution panel, disconnect, or inverter terminals.
Faulty grid-tie inverter component affecting voltage regulation.
High impedance on the neutral conductor, causing voltage imbalance.
Utility grid issues or brownouts.

Solution:

1

*Verify Grid Voltage:** Use a calibrated multimeter to measure the AC voltage at the inverter's AC input terminals *during* periods of peak load. Compare this reading to the utility's nominal voltage and the inverter's operating range specified in the datasheet. Note that this requires a qualified electrician.
2

*Inspect Wiring:** Carefully inspect all AC wiring connections from the service panel to the inverter, including breakers, disconnects, and terminal blocks. Tighten any loose connections and clean corroded surfaces. Follow NEC 110.12 regarding workmanship.
3

*Measure Current Draw:** Use a clamp meter to measure the current draw of major appliances and the total load on the service panel. Compare these measurements to the panel's rating and the utility service capacity. An overloaded panel can cause significant voltage drops.
4

*Check Neutral Impedance:** Use a low-resistance ohmmeter to measure the impedance of the neutral conductor between the service panel and the inverter. High impedance can indicate a loose or corroded connection.
5

*Review Inverter Logs:** Access the inverter's monitoring portal or local interface to review historical data and error logs. Look for patterns or correlations between Error 32 occurrences and specific load events.
6

*Contact Utility:** If the grid voltage is consistently low, even with minimal household load, contact the utility company to report the issue and request a voltage test at the meter.
7

*Test with Dummy Load:** Disconnect the inverter from the solar array (following proper DC disconnect procedures per NEC 690) and connect a resistive AC load bank. Monitor the AC voltage with the load bank active to isolate if the inverter AC output is the cause.

Safety Warning:

Working with electrical systems involves significant hazards, including electrocution and arc flash. AC voltage can be lethal. Always disconnect the AC breaker and the DC disconnect(s) from the solar array and battery *before* performing any inspection or maintenance. Wear appropriate personal protective equipment (PPE), including safety glasses and insulated gloves. NEC 690.12 mandates rapid shutdown systems for PV arrays on buildings; verify proper functionality. Only qualified electricians should perform these procedures.

Prevention:

• Regularly inspect and tighten all electrical connections in the AC distribution system.
• Monitor the inverter's performance and error logs for any signs of voltage issues.
• Avoid overloading the service panel by managing energy consumption and staggering high-power appliance usage.
• Ensure proper ventilation around the inverter to prevent overheating, which can affect its performance.
• Consider upgrading the service panel or utility service if the household's energy needs have increased significantly.

Expert Tip:

In SolarEdge SetApp, check the "Grid Protection Settings" under Commissioning. Ensure the Low AC Voltage Ride-Through (LVRT) settings are correctly configured and compliant with local utility requirements. Incorrect LVRT settings can trigger Error 32 even with minor voltage dips.