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Generac•PV Link

Analysis by Marcus & Team

Generac PV Link Error 189 REbus DC Link High

Troubleshoot Generac PV Link Error 189 (REbus DC Link High). Diagnose overvoltage, grounding issues, and component failures. Expert guide for residential hybrid inverters.

Frequently Asked Questions

•What is the maximum DC input voltage for the Generac PV Link?

Refer to the PV Link's datasheet for the specific model's maximum DC input voltage. Exceeding this voltage can damage the unit.

•Where is the DC disconnect located in a Generac PV Link system?

The DC disconnect is typically located near the PV Link or the main inverter. It allows for safe isolation of the PV array.

•What are the NEC requirements for rapid shutdown of PV systems?

NEC 690.12 specifies rapid shutdown requirements for PV systems to de-energize conductors within a specified distance of the array in the event of an emergency.

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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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Why This Happens:

Overvoltage from the PV array exceeding the PV Link's maximum input voltage.
Faulty voltage regulation within the PV Link's DC-DC converter.
Grounding issues causing voltage imbalances on the DC bus.
Defective DC link capacitor in the PV Link.
Communication error between the PV Link and the inverter control system misinterpreting the voltage reading.
Failure of the REbus voltage sensor.

Critical Safety Precautions:

High DC voltage is present in the PV array and DC link. Always disconnect the PV array before working on the PV Link. Follow NEC 690 guidelines for safe PV system maintenance. Arc flash hazard exists. A qualified electrician with PV system experience is required for troubleshooting and repair. Never work on live circuits.

Technical Overview:

The PV Link is a DC-DC converter that optimizes PV energy for the REbus. The DC link voltage is regulated by the PV Link to ensure efficient power transfer. Error 189 indicates the DC link voltage exceeds the acceptable operating range, triggering a fault to protect the system from damage. The REbus manages energy flow between PV, battery, and grid. Overvoltage can damage connected components like inverters or batteries.

Technical Recommendation:

Access Generac's service menu (consult Generac documentation) and monitor the real-time REbus DC link voltage. This can help pinpoint intermittent overvoltage conditions and identify communication issues.

Symptoms:

PV Link displays Error 189, indicating a high DC link voltage on the REbus (Generac's communication bus). The inverter may shut down or operate erratically. PV production may be limited or halted.

Solution:

1

Disconnect the PV array from the PV Link at the DC disconnect per NEC 690.
2

Verify proper DC disconnect operation.
3

Using a calibrated multimeter, measure the DC link voltage at the PV Link's output terminals. Compare the reading to the manufacturer's specifications.
4

Inspect the wiring and connections for any signs of damage or corrosion. Ensure proper grounding.
5

Use a clamp meter to measure the DC current flow on the REbus. Look for excessive current or fluctuations.
6

Check the PV array voltage and current to ensure it is within the PV Link's operating range. Use an IV curve tracer if available.
7

If possible, use Generac's service tool to monitor the DC link voltage in real-time and check for error history. Look for firmware update options.
8

If a component failure is suspected, contact a qualified Generac technician for repair or replacement.

Preventative Care:

Periodically inspect the PV array and PV Link for damage or corrosion.
Check the DC disconnect for proper operation.
Monitor the system performance through the Generac monitoring app.
Ensure the system firmware is up to date.
Perform routine maintenance, including cleaning the PV panels and inspecting wiring connections.