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Generac•PV Link

Analysis by Marcus & Team

Generac PV Link Error 156: Arc Fault Lockout

Troubleshoot Generac PV Link Error 156 (Arc Fault Lockout). Understand causes, solutions, safety procedures, and prevention for residential solar systems.

Frequently Asked Questions

•What is the typical voltage range for a PV string in a residential system?

Typically, a residential PV string voltage ranges from 200V to 600V DC, depending on the number of modules in the string.

•How do I safely disconnect the DC power from my Generac PV Link inverter?

First, turn off the AC breaker that feeds the inverter. Then, locate the DC disconnect switch (usually near the inverter) and turn it to the 'OFF' position. Refer to the inverter's manual for specific instructions.

•What are the common signs of a failing PV module that could lead to an arc fault?

Common signs include discoloration, delamination, cracks, burn marks, or hot spots. These can indicate internal cell damage that may cause arcing.

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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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Observed Symptoms:

The Generac PV Link inverter displays Error 156, indicating an arc fault lockout. The system ceases energy production, and may disconnect from the grid. The inverter may require manual reset to resume operation.

How It Works:

The Generac PV Link is a hybrid inverter incorporating MPPT for solar input, DC/AC conversion for grid synchronization, and battery management for energy storage. Error 156 signifies the Arc Fault Circuit Interrupter (AFCI) has detected a dangerous arc, triggered a shutdown, and entered a lockout state. This protects against fire hazards. The AFCI monitors for abnormal current fluctuations indicative of arcing.

Important Warnings:

High DC voltage is present in PV systems. Arc flash hazards exist. Never work on energized circuits. Always disconnect AC and DC power before performing any maintenance. Adhere to NEC Article 690 for safe PV system system and maintenance. Qualified electricians are mandatory for servicing this equipment.

Recommended Action:

1

De-energize the PV system: Follow NEC 690.
2

Disconnect the AC breaker and DC disconnects to isolate the inverter.
3

Visually inspect PV wiring: Check for frayed insulation, rodent damage, or loose connections. Use an IR thermometer to identify hot spots indicative of arcing.
4

Check DC connectors: Ensure proper mating and tightness. Measure voltage drop across connectors using a multimeter (should be near zero).
5

Isolate PV strings: Disconnect individual PV strings at the combiner box and use a DC clamp meter to measure short circuit current (Isc). Compare Isc values to identify potentially faulty modules or strings.
6

Test PV module insulation resistance: Use a megohmmeter (insulation tester) to verify insulation integrity between PV conductors and ground. Readings should be above the manufacturer's specification (typically > 100 MΩ).
7

Verify grounding: Check the grounding conductor connections for proper continuity and tightness. Refer to NEC 250 for grounding requirements.
8

Reset the inverter: After addressing the identified issue, clear the Error 156 code and restart the inverter following the manufacturer's instructions. Monitor system performance.

Common Causes:

Damaged PV wiring: Insulation degradation leading to short circuits or series arcs.
Loose DC connectors: Improperly tightened or corroded connectors increasing resistance and causing arcing.
Water ingress into junction boxes: Moisture creating conductive paths, promoting arcing.
Failing PV module: Internal cell defects causing arcing within the module.
Rodent damage: Exposed wiring chewed by rodents leading to short circuits and arcing.
Inverter AFCI malfunction: Internal component failure leading to false arc detection.

Preventative Care:

Annual visual inspection: Inspect wiring, connectors, and junction boxes for damage or corrosion.
Torque check: Verify proper torque on all DC connectors and terminals.
Rodent control: Implement measures to prevent rodent intrusion into the system.
Firmware updates: Keep the inverter firmware updated to ensure proper AFCI functionality.
licensed technician maintenance: Schedule periodic inspections and maintenance by a qualified electrician.