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Bluetti•AC300

Analysis by Marcus & Team

Bluetti AC300 Inverter Hardware Fault After Grid Surge

Diagnose Bluetti AC300 inverter hardware fault after a grid surge. Follow our expert steps for residential solar energy systems.

Frequently Asked Questions

•What type of surge protection is recommended for a Bluetti AC300?

A Type 2 surge protection device (SPD) is recommended, installed at the main electrical panel. Additionally, use plug-in surge protectors for the AC input of the AC300.

•How can I check the firmware version of my Bluetti AC300?

The firmware version can be checked through the Bluetti mobile app or the device's LCD screen, usually found in the settings or information menu.

•What is the warranty coverage for the Bluetti AC300 inverter?

Bluetti typically offers a warranty of 2-5 years for their AC300 inverter, but the exact terms and conditions can vary. Refer to the official warranty document for detailed information.

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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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Expert Tip:

Access the Bluetti AC300's diagnostic menu by pressing and holding the "AC" and "Info" buttons simultaneously for 5 seconds. This may reveal more detailed error codes and system information useful for troubleshooting. Record all diagnostic codes before contacting support.

Common Causes:

Damaged Metal Oxide Varistor (MOV) due to surge.
Failure of DC bus capacitors caused by overvoltage.
Damaged IGBTs or MOSFETs in the inverter bridge due to excessive current.
Failure of the grid synchronization circuitry.
Corrupted firmware affecting inverter operation.
Relay failure within the automatic transfer switch (ATS) preventing proper AC power transfer.

Observed Symptoms:

The Bluetti AC300 displays an "Inverter Hardware Fault" error message after a grid surge event. The system may not be providing AC power or charging from the grid.

Safety Warning:

The Bluetti AC300 operates with high voltages (DC and AC). Improper handling can result in serious injury or death. Only qualified electricians should perform diagnostic and repair work. Always disconnect the AC300 from all power sources before working on it. Wear appropriate personal protective equipment (PPE), including insulated gloves and safety glasses. Be aware of potential arc flash hazards. Follow NEC 705 and manufacturer's guidelines for safe system and operation.

Recommended Action:

1

Disconnect the AC300 from both the grid and the solar panels. Follow NEC 690.15 for DC Disconnect requirements.
2

Disconnect the battery bank from the AC300.
3

Visually inspect the AC300 for any signs of physical damage, such as burned components or bulging capacitors. Use an insulated flashlight.
4

Use a multimeter to check the DC bus voltage. Verify it is within the manufacturer's specified range. A qualified electrician should perform these measurements.
5

Using a multimeter, test the MOVs for continuity. High resistance indicates a damaged MOV.
6

Consult the Bluetti AC300 service manual for specific diagnostic procedures and component-level testing.
7

If the problem persists, contact Bluetti support for warranty service or repair. A qualified technician with experience in power electronics should perform repairs.

How It Works:

The Bluetti AC300 is a hybrid inverter system integrating a DC-AC inverter, battery charger, and automatic transfer switch (ATS). The inverter converts DC power from solar panels or batteries to AC power for household use. The battery charger manages the charging of the batteries from either solar or grid power. The ATS automatically switches the load between the grid and the inverter output during a power outage. Grid surges can damage the inverter's sensitive components, including the MPPT controller, DC-DC converter, and AC-DC rectifier. Anti-islanding protection is crucial to prevent backfeeding the grid during outages.

Prevention:

Install a surge protection device (SPD) at the main service panel to protect the entire home from grid surges, following NEC 230.67.
Use high-quality surge protectors on all AC inputs to the AC300.
Regularly check the AC300's firmware and update it to the latest version.
Monitor the AC300's performance using the Bluetti app or web interface. Note any unusual behavior or error messages.