How to Set State of Charge (SoC) and Calibrate a Victron SmartShunt Using VictronConnect

Step 1: Open the SmartShunt in VictronConnect

1. Open the VictronConnect app
2. Select your SmartShunt from the device list
3. Confirm you are on the Overview screen

Step 3: Set the Charged Voltage

This value tells the shunt when the battery should be considered full.

Typical values:

• LiFePO₄: 13.4–13.6V (12V systems)
• AGM / Lead-acid: 13.2–13.4V

1. In Battery settings
2. Locate Charged voltage
3. Enter the value recommended by your battery manufacturer

For lithium systems, this is critical.
Too high = SoC never reaches 100%
Too low = false full readings

Step 4: Set Tail Current

Tail current defines when charging is considered “complete.”

1. Find Tail current
2. Set to:

• • Lithium: 2–4%
  • Lead-acid: 3–5%

This value represents the point where charging current tapers off and the battery is effectively full.

Step 5: Set Charged Detection Time

This prevents brief voltage spikes from triggering a false full state.

1. Set Charged detection time
2. Recommended value: 3 minutes

This means voltage and tail current conditions must be met continuously for the set duration.

Step 6: Victron SmartShunt State of Charge Calibration

The SmartShunt can be synchronized in two different ways, depending on your system and what reference data you have available.

Option A: Automatic Synchronization (Standard Method)

Use this method when the battery bank is known to be fully charged.

1. Confirm batteries are fully charged

• • Charging source active (solar or shore power)
  • Charging current has tapered
  • Battery voltage is stable at float

1. In VictronConnect → SmartShunt → Battery settings
2. Tap Synchronize
3. Confirm when prompted

The SmartShunt will reset State of Charge to 100%.

This is the preferred method when full charge conditions are met.

Option B: Manual State of Charge Entry (Manufacturer App Reference)

Some lithium batteries include an internal BMS that reports State of Charge through the manufacturer’s app.
Examples include batteries from Epoch Batteries.

In these cases, you may manually align the SmartShunt with the battery’s reported SoC.

When to Use This Method

• Battery is not yet fully charged
• Battery BMS app reports a reliable SoC value
• You need to re-align the SmartShunt after a deep discharge
• The system was powered down and SoC drifted

Steps

1. Open the battery manufacturer’s app
2. Note the current State of Charge reported by the battery
   (example: 72%)
3. Open VictronConnect
4. Select the SmartShunt
5. Go to Settings → Battery
6. Locate State of charge
7. Manually enter the value reported by the battery (e.g., 72%)
8. Confirm the change

The SmartShunt will now continue tracking charge and discharge from this corrected reference point.

For official Victron documentation on battery monitoring and SmartShunt configuration, refer to Victron Energy’s SmartShunt manual.

Important Notes About Manual SoC Entry

• This does not replace proper synchronization at full charge
• Manual entry is a temporary alignment, not a calibration
• For best long-term accuracy, perform a full charge synchronization when possible
• If the battery app and SmartShunt consistently disagree, review:
• • Battery capacity setting
  • Charged voltage
  • Tail current

Best Practice Recommendation

• Short term: Manual SoC entry is acceptable when needed
• Long term: Always synchronize at full charge when conditions allow

For lithium systems with smart BMS reporting, many owners use:

• Manual SoC alignment during normal operation
• Full synchronization after extended charging sessions

Proper Victron SmartShunt state of charge calibration ensures the battery monitor remains accurate over time, even after deep discharges or system restarts.