Victron MPPT Error 1, 2, and 11: Battery Temperature and Voltage Faults

Key Takeaways

• Victron MPPT Errors 1, 2, and 11 relate to battery conditions: temperature, voltage, and ripple.
• Error 1 and 2 auto-reset once the condition resolves; Error 11 requires checking connections.
• Always disconnect all power sources (PV, battery, AC) before inspecting wiring or components.
• If basic checks do not resolve the error, contact a qualified Victron dealer or technician.

What do Victron MPPT Errors 1, 2, and 11 mean?

Victron MPPT Error 1 indicates the battery temperature is too high, while Error 2 signifies the battery voltage is too high. Error 11 points to a battery high ripple voltage condition. In all these cases, the Victron MPPT charger will stop charging to protect the battery from potential damage.

Diagnosis

When your Victron MPPT solar charge controller displays an error code, follow these steps to diagnose the issue. You can read the error code directly from the controller's display, its LED indicators, or through the VictronConnect app or a remote panel like the Color Control GX or MPPT Control.

1. Identify the specific error code. Note whether it is Err 1, Err 2, or Err 11.
2. For Err 1 (Battery temperature too high):

• • Check the battery's physical temperature. Feel the battery casing. Is it unusually warm?
  • Verify external temperature sensor readings. If you use an external sensor like a Smart Battery Sense or BMV, check its reported temperature. The battery temperature can be received by an external sensor (like Smart Battery Sense or BMV), or measured by the charger when this feature is available.
  • Inspect the battery's environment. Ensure the battery is not in direct sunlight or an enclosed space with poor ventilation.

3. For Err 2 (Battery voltage too high):

• • Measure battery voltage. Use a multimeter to get an accurate reading of the battery's voltage at its terminals.
  • Look for other charging sources. Check if there are other chargers (e.g., AC charger, vehicle alternator, another solar charger) connected to the battery bank that might be overcharging it.
  • Verify MPPT battery voltage setting. Confirm that the MPPT's configured battery voltage (e.g., 12V, 24V, 48V) matches your connected battery bank. This error can also occur if the battery voltage (12, 24 48V) is set to a lower voltage than the connected battery.

4. For Err 11 (Battery high ripple voltage):

• • Inspect all battery connections. Visually check all battery cables and terminals for looseness, corrosion, or damage.
  • Check wiring integrity. Ensure all wiring is properly sized and securely connected, especially between the MPPT and the battery.

Cause/fix table section

Battery-side vs. Charger-side Checks

When troubleshooting battery-related errors, it's important to distinguish between issues originating from the battery itself and those from the charge controller or its settings.

For Err 1 (Battery temperature too high): This error is primarily battery-side. The charger stops charging to prevent damaging the battery. Your focus should be on the battery's environment and its temperature management. Ensure adequate ventilation around the battery bank. If an external temperature sensor is used, verify its connection and functionality. The charger relies on this sensor or its internal measurement to detect the high temperature.

For Err 2 (Battery voltage too high): This error can stem from both battery-side and charger-side factors.

• Battery-side: The most common cause is another charging source (like a grid charger or another solar controller) pushing the battery voltage above safe limits. You must identify and manage all charging inputs to the battery.
• Charger-side: An incorrect battery voltage setting on the Victron MPPT itself can trigger this error. Ensure the MPPT is configured for the correct battery voltage (12V, 24V, or 48V). A fault within the MPPT charge controller could also cause it to incorrectly read or regulate voltage, leading to this error.

For Err 11 (Battery high ripple voltage): This error is typically battery-side, indicating an issue with the battery's ability to maintain a stable voltage under load or charge. The primary fix direction is to check all battery connections and wiring. Loose, corroded, or undersized cables can cause voltage fluctuations that the MPPT interprets as high ripple.

Errors 1 and 2 will auto-reset after the battery temperature or voltage has dropped. This means the charger will resume operation once the condition is resolved. Error 11, however, may require you to manually address the underlying connection issues.

Safety: Working with Batteries and Electrical Systems

Always prioritize safety when working with solar power systems and batteries.

• Disconnect Power: Before inspecting any wiring or connections, always disconnect all power sources. This includes disconnecting the solar panels, the battery bank, and any AC input to inverters or chargers.
• Insulated Tools: Use insulated tools to prevent accidental short circuits, especially when working near battery terminals. A spanner across a battery bank can short hundreds of amps, causing severe burns and equipment damage.
• Eye Protection: Wear appropriate eye protection when working with batteries, particularly flooded lead-acid types, as they contain corrosive acid.
• Ventilation: Ensure adequate ventilation when working with batteries, especially during charging, as they can produce explosive hydrogen gas.
• Battery Temperature Protection: The Victron MPPT charger includes battery temperature protection, where it stops charging to prevent damaging the battery if temperature is too high.
• Battery Voltage Protection: Similarly, the charger stops charging if battery voltage is too high, protecting the battery from overcharge.

When to call a technician instead

While many basic troubleshooting steps can be performed by the system owner, there are situations where professional help is necessary.

• Persistent Errors: If Err 1, Err 2, or Err 11 persist after you have performed all the recommended checks and fixes.
• Suspected Controller Fault: If you suspect a fault within the Victron MPPT charge controller itself, especially for Err 2 when all other charging sources and settings are verified correct.
• Complex Wiring Issues: If you are uncomfortable inspecting or tightening battery connections, or if you suspect internal battery damage for Err 11.
• Warranty Concerns: Attempting repairs beyond basic troubleshooting might void your product warranty. Consult your Victron dealer or a certified technician for advanced diagnostics and repairs.