Victron Grid Codes and Loss of Mains Detection Troubleshooting

Key Takeaways

• Overload shutdowns or feed-in issues in Victron systems can be caused by Loss of Mains (LOM) detection reacting to grid instability.
• The first step in troubleshooting LOM issues is to check and adjust settings in VEConfigure, specifically on the Grid tab.
• Disabling LOM detection for a utility grid connection requires the installation of external anti-islanding safety devices (ENS).
• Always contact your Victron dealer for passwords required to change critical LOM detection settings in VEConfigure.

Why is my Victron system shutting down or not feeding into the grid?

Your Victron inverter/charger may be shutting down or temporarily disabling grid feed-in due to issues with its Loss of Mains (LOM) detection or incorrect grid code settings. This often occurs when the inverter/charger algorithm becomes unstable due to high grid impedance, such as when connected to a generator or a long extension cable. The LOM detection can then "push and pull" on the grid voltage, leading to high currents and the unit switching itself off in overload.

Diagnosis

Follow these steps to diagnose issues related to Victron grid codes and Loss of Mains detection. This document applies to VE.Bus firmware 419 and later.

1. Identify the symptom. Note if the system is experiencing overload shutdowns, or if it is temporarily disabling feed-in to the grid.

• • Result: If the system is shutting down with an overload error, or if grid feed-in is intermittent, LOM detection or grid code settings may be involved.

2. Access VEConfigure software. Connect your computer to the Victron inverter/charger using the appropriate interface.

• • Result: You should be able to open VEConfigure and connect to your device.

3. Navigate to the Grid tab. In VEConfigure, locate and select the "Grid" tab.

• • Result: This tab contains the settings for LOM detection and grid codes.

4. Review LOM detection settings. Check the current setting for LOM detection. Options include "None", "Disabled", "Type A", or "Type B".

• • Result: If LOM detection is set to an active type (Type A or B) and you are experiencing instability, it may be too sensitive for your grid connection.

5. Review Grid code settings. Examine the selected grid code. This should correspond to your local country-specific regulations. Options include "None", "Other", or specific country codes like "Germany: VDE-AT-N 4105:2018-11 external NS protection".

• • Result: An incorrect grid code can lead to non-compliance or operational issues with the utility.

6. Consider grid connection quality. Evaluate if your system is connected to a source with high grid impedance, such as a generator or a long extension cable.

• • Result: High grid impedance can exacerbate LOM detection issues, leading to "continuous increases and decreases in frequency" and instability.

Cause/fix table section

Configuring Grid Codes and Loss of Mains Detection

Victron inverter/chargers, including Multis, Quattros, MultiCompacts, and MultiPlus-II models, use VEConfigure software for setting grid codes and Loss of Mains (LOM) detection. These settings are crucial for safe and compliant operation, especially when connected to a utility grid or a generator.

To access these settings, open VEConfigure and navigate to the "Grid" tab.

Loss of Mains (LOM) Detection Settings

The LOM detection setting determines how the Victron system reacts to the absence of grid power.

• "None" or "Disabled": These settings turn off active LOM detection. To change the LOM detection setting to "None" or "Disabled", you must use VEConfigure and go to the Grid tab. This operation requires a password. You need to contact your Victron dealer to obtain this password.
• • Utility Connection: If you disable LOM detection on an input connected to the utility grid, it is only allowed when other external safety equipment is installed, by means of an anti-islanding safety device.
  • Generator Connection: There is no regulatory need to install external anti-islanding equipment when disabling LOM in combination with a generator.
• "Type A" or "Type B": These are active LOM detection types. The specific behavior of these types is detailed in the Victron documentation.

Grid Code Settings

Grid codes are country-specific configurations that ensure your Victron system complies with local electrical regulations.

• Country-specific codes: These are pre-defined settings for various regions. For example, MultiPlus-II models are certified to be installed without requiring additional external anti-islanding safety devices (ENS) in Germany, using the "Germany: VDE-AT-N 4105:2018-11 external NS protection" grid code. Multis, Quattros, and MultiCompacts are certified for use in the UK.
• "None" or "Other": These options are available for situations where a specific grid code is not listed or for custom configurations. Always ensure compliance with local rules and regulations when using these settings.

Safety

Working with grid-tied inverters and generators involves significant electrical hazards. Always prioritize safety.

• External Anti-Islanding Equipment (ENS): If you disable Loss of Mains detection for an input connected to the utility grid, external anti-islanding safety devices are required. This is a critical safety measure to prevent the inverter from feeding power back into a de-energized grid, which could endanger utility workers.
• Generator Safety: When working with generators and disabling LOM detection, ensure that clear signs and other means are in place to make it very clear to any installer working on the generator that they must also switch off, or otherwise disconnect, the inverter/charger system.
• Local Regulations: Always make sure to comply with local rules and regulations. This is a critical safety issue that overrides any general guidance.

When to call a technician instead

While some settings adjustments can be done by the system owner, certain situations require professional assistance.

• Password-Protected Settings: If you need to change LOM detection to "None" or "Disabled", a password is required. You must contact your Victron dealer for this password. Attempting to bypass this can void warranties or create unsafe conditions.
• External Anti-Islanding Device Installation: If disabling LOM detection for a utility connection, the installation of external anti-islanding safety equipment is mandatory. This is specialized work that should be performed by a qualified technician to ensure compliance and safety.
• Persistent Issues: If your Victron system continues to experience overload shutdowns, feed-in issues, or other instability after reviewing basic settings, a technician can perform a more in-depth diagnosis.
• Uncertainty about Regulations: Grid codes and local regulations can be complex. If you are unsure about the correct settings for your region or the implications of certain configurations, consult a certified Victron installer or a qualified electrician.