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Analysis by Marcus & Team

SolarEdge Inverter: Thermal Throttling Alert Causes

Troubleshoot SolarEdge thermal throttling alerts in residential hybrid inverters. Learn causes, solutions, and safety for optimal solar energy system performance.

Frequently Asked Questions

•What is the typical operating temperature range for a SolarEdge hybrid inverter?

Typically -20°C to +60°C. Refer to the specific inverter model's datasheet for precise specifications.

•How do I perform a DC disconnect according to NEC standards?

Refer to NEC Article 690. Follow the inverter manufacturer's specific instructions for DC disconnect procedures, including operating the rapid shutdown switch if applicable. Ensure all voltage is removed before servicing.

•What are the signs of a failing cooling fan in a SolarEdge inverter?

Unusual noises (grinding, squealing), reduced airflow, or the fan not spinning at all. Check the inverter's event log for fan-related error codes.

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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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Symptoms:

The mySolarEdge app displays a “Thermal Throttling” alert, indicating the inverter is reducing power output due to excessive internal temperature. This may result in reduced energy production and longer battery charging times.

Expert Tip:

Access the SolarEdge inverter's service menu (usually by holding down the power button for a specific duration - consult the service manual) to view real-time temperature readings from internal sensors. This can help pinpoint the source of the overheating issue. Check the fan speed percentage in the service menu.

Critical Safety Precautions:

Hybrid inverters operate at high DC voltages (up to 600V+). Always disconnect both the AC and DC power sources before performing any maintenance or inspection. Follow NEC rapid shutdown procedures to de-energize the PV system. Only qualified electricians should perform internal repairs or component replacements. Arc flash hazards exist. Wear appropriate personal protective equipment (PPE), including safety glasses and insulated gloves.

Solution:

1

Ensure the inverter has adequate ventilation space (refer to the SolarEdge system manual for specific clearance requirements).
2

Inspect the inverter's cooling fins and clean them with a soft brush or vacuum cleaner to remove dust and debris. Disconnect AC and DC power before cleaning.
3

Verify the ambient temperature around the inverter is within the specified operating range. Consider adding shading or ventilation if the temperature is too high.
4

Use an IR thermometer to measure the temperature of the inverter's heatsinks and internal components. Compare these readings to the specifications in the SolarEdge service manual. Document all readings.
5

Check the inverter's fan operation. If the fan is not running or is running erratically, it may need to be replaced. Consult the SolarEdge service manual for replacement procedures.
6

Review the inverter's event log for any other error codes or warnings that may be related to the thermal throttling issue. Contact SolarEdge support for assistance if needed.
7

If the issue persists, a qualified electrician should inspect the inverter's internal components for signs of damage or failure. Replacement of the inverter may be necessary.

Why This Happens:

Insufficient ventilation around the inverter.
Blocked or dirty cooling fins on the inverter's heatsink.
High ambient temperature exceeding the inverter's operating range (typically -20°C to +60°C).
Component failure within the inverter's cooling system (e.g., fan malfunction).
Overloading the inverter beyond its rated power output, causing excessive heat generation.
Firmware bugs causing inaccurate temperature readings or improper fan control.

How It Works:

SolarEdge hybrid inverters use sophisticated MPPT algorithms and DC/AC conversion stages. High temperatures can negatively impact the efficiency and lifespan of power electronic components (e.g., IGBTs, capacitors). The inverter's internal temperature sensors trigger a throttling mechanism to protect components from overheating, reducing output power and preventing damage. The inverter monitors the temperatures of heatsinks, transformers, and critical semiconductors. Proper cooling is crucial for optimal performance and longevity.

Prevention:

Schedule regular inspections of the inverter's cooling system to ensure proper ventilation and cleanliness.
Monitor the inverter's performance data in the mySolarEdge app to identify any signs of overheating or reduced power output.
Keep the area around the inverter clear of obstructions to ensure proper airflow.
Apply firmware updates promptly.
Every 3 years, a qualified technician should perform an in-depth inspection, including thermal imaging, to identify potential hot spots or failing components.