Solis Inverter Alarm Codes and Fixes in Saudi Arabia

Key Takeaways

• Ginlong Solis S5 and S6 series grid-tied and hybrid energy storage inverters protect system components by alerting operators via alphanumeric error messages on the display or SolisCloud.
• When distribution voltage rises, code OV-G-V01 warns that grid voltage exceeds the upper voltage range, requiring AC line and transformer tap verification.
• Conversely, during voltage drops, UN-G-V01 triggers when grid voltage exceeds the lower voltage range.
• If utility power cuts out, NO-Grid requires technicians to confirm whether the power grid is abnormal and confirm that the AC cable is properly connected.
• On hybrid storage installations, backup port trips labeled Over-Load signal a load overload fault, while communication mismatches report wrong battery brand selection.

How Do Solis Inverters Report Faults in Saudi Arabia?

Solis string and hybrid storage inverters are widely deployed across residential villas and commercial facilities in Saudi Arabia, from Riyadh and Madinah to Dammam and the Western Province. These units feature responsive power electronic protection designed to disconnect the inverter if grid parameters drift or internal operating thresholds are breached.

Under Saudi utility rules, systems must still comply with technical requirements such as voltage compatibility and safety standards per the saudi distribution code. Furthermore, compliance with permitting metering and interconnection rules is key to maintaining long-term grid certification with the Saudi Electricity Company (SEC).

When an operational anomaly occurs, Solis inverters record an event code. These codes fall into four main categories:

1. Utility Grid Disturbances (OV-G-V01, UN-G-V01, OV-G-F01, UN-G-F01, NO-Grid): Voltage and frequency boundary excursions on the SEC distribution network.
2. Array Input Overvoltages (OV-DC01): High DC string open-circuit voltage during cold winter mornings.
3. Battery Storage & Protocol Errors (BatName-FAIL, UN-Vbatt, OV-Vbatt): Battery management system (BMS) communication or voltage threshold trips.
4. Inverter Port Overload (Over-Load): Critical load demands exceeding the inverter's backup rating.

```
+-------------------------------------------------------------+

+-------------------------------------------------------------+
|
+-----------------------+-----------------------+
| |
[Grid Disconnects] [Storage & DC Arrays]

• OV-G-V01: High AC Voltage - OV-DC01: High DC Voltage
• UN-G-V01: Low AC Voltage - Over-Load: Backup Overload
• OV-G-F01: High Frequency - BatName-FAIL: Protocol Error
• UN-G-F01: Low Frequency - UN-Vbatt: Low Battery V
• NO-Grid: Outage / Disconnect - OV-Vbatt: High Battery V
  ```

Solis Alarm Codes and Factory Corrective Matrix

The following table summarizes the most common Solis inverter fault codes, their system impact, and factory-mandated corrective actions:

Resolving Grid Anomaly Alarms

Code OV-G-V01: Grid Overvoltage

• Factory Directive: Grid voltage exceeds the upper voltage range
• Saudi Field Context: During midday periods when solar generation peaks across residential neighborhoods in Riyadh or Jeddah, aggregate solar export elevates distribution line voltage.
• Resolution Steps:

1. 1. Measure the true-RMS AC voltage between Line and Neutral at the inverter AC terminals using a calibrated digital multimeter.
   2. Compare the measurement against the configured grid code high-voltage disconnect threshold.
   3. Check the impedance of the AC cable between the inverter and the main distribution board. Undersized AC cables create excessive voltage drop (and voltage rise during export). If the AC voltage at the main switchboard is within limits but high at the inverter terminals, upgrade the AC cable cross-section.
   4. If the entire neighborhood experiences overvoltage, contact the Saudi Electricity Company (SEC) to request a transformer tap change.

Code UN-G-V01: Grid Undervoltage

• Factory Directive: Grid voltage exceeds the lower voltage range
• Resolution Steps: During extreme summer heat, simultaneous operation of centralized HVAC chillers and split air conditioners can pull neighborhood grid voltages down. If voltage drops below the low disconnect setpoint, the inverter shuts down to protect its internal circuitry. Verify grid voltage at the main breaker panel; the inverter will automatically resume operation once the utility voltage recovers within allowable bounds.

Codes OV-G-F01 and UN-G-F01: Frequency Deviations

• Overfrequency: Grid frequency exceeds the upper frequency range
• Underfrequency: Grid frequency exceeds the lower frequency range
• Resolution Steps: Saudi Arabia operates on a synchronized 60 Hz national transmission grid. Frequency alarms reflect utility network-level events or industrial facilities operating on captive diesel generator microgrids. Verify that backup generators are running at a stable 60 Hz before reconnecting the solar inverter.

Code NO-Grid: Grid Outage or Isolation

• Factory Directives:

1. 1. 1. Confirm whether the power grid is abnormal.
   2. 2. Confirm that the AC cable is properly connected.

• Resolution Steps:

1. 1. Determine whether neighboring buildings have lost power. If a local blackout is underway, the inverter remains safely disconnected under anti-islanding protection.
   2. If the utility network is operational, inspect the AC isolator switch mounted next to the inverter, the dedicated solar breaker in the sub-panel, and the main switchboard breaker. Reset any tripped breakers after checking for underlying short circuits.

Resolving Storage and DC Alarms (Solis Hybrid Systems)

Code Over-Load: Backup Power Overload

• Factory Directive: Load overload fault
• Resolution Steps: The Solis S6 hybrid series provides an independent emergency power supply (EPS) backup port to power essential circuits during grid outages. If users connect high-demand inductive appliances (such as heavy water pumps or central air conditioners), the initial motor inrush current trips the port under a load overload fault.

1. 1. Shed non-essential inductive loads from the critical backup sub-panel.
   2. Restart the inverter or clear the fault via the display panel to restore power to essential lighting and refrigeration circuits.

Code BatName-FAIL: Battery Protocol Error

• Factory Directive: Wrong battery brand selection
• Resolution Steps: Solis hybrid inverters communicate with approved lithium battery management systems (BMS) over CAN or RS485 communication lines. If an installer selects an incorrect battery brand or communication profile in the setup wizard, the inverter cannot authenticate the BMS and posts wrong battery brand selection.

1. 1. Access the battery configuration menu on the Solis display.
   2. Verify the battery manufacturer and model. Select the exact battery protocol corresponding to the installed battery bank (e.g., Pylontech, Dyness, BYD).
   3. Verify the pinout of the RJ45 communication cable between the inverter CAN port and the battery BMS.

Codes UN-Vbatt and OV-Vbatt: Battery Voltage Limits

• Low Voltage: Battery undervoltage detected
• High Voltage: Battery overvoltage detected
• Resolution Steps: If the battery bank sits discharged for an extended period, voltage drops below the minimum operating threshold, triggering battery undervoltage detected. Activate the battery's manual wake-up button or initiate a black-start pre-charge. Conversely, if high voltage is detected, inspect the BMS balance settings to verify charge voltage parameters.

Code OV-DC01: DC String Overvoltage

• Factory Directive: DC 1 input overvoltage
• Resolution Steps: If an array string contains too many solar modules in series, low ambient winter temperatures cause the open-circuit voltage ($V_{oc}$) to exceed the inverter's maximum DC input limit.

1. 1. Immediately switch off the DC isolator.
   2. Measure the string open-circuit voltage with a 1000V DC voltmeter.
   3. Reconfigure the string wiring by removing one or more series-connected modules to ensure the maximum open-circuit voltage remains safely below the inverter's rating under worst-case winter conditions.