Victron SmartShunt Setup Guide for Campervans

The Victron SmartShunt is the most popular battery monitor in the UK campervan community, and for good reason. At around £60, it provides accurate state of charge tracking, real-time power data, and Bluetooth monitoring through the excellent VictronConnect app. This guide walks you through the complete installation and setup process for a campervan build. For background on why you need a battery monitor and how they work, see our campervan battery guide and our battery monitor overview.

Getting the SmartShunt installed correctly is straightforward, but the details matter. A wrongly positioned shunt or incorrect settings will give you inaccurate readings that are worse than no monitor at all. Follow this guide step by step and you will have accurate battery monitoring from day one. If you have not yet sized your battery bank, our calculator helps you work out the right capacity based on your actual usage.

What Is in the Box

The Victron SmartShunt IP65 500A/50mV package includes:

• 500A/50mV precision shunt (a metal bar with two bolts)
• Bluetooth Smart dongle (pre-connected to the shunt via RJ12 cable)
• Battery positive sense wire with inline fuse (1A)
• RJ12 connection cable (shunt to Bluetooth module)
• M10 bolt hardware for the shunt connections
• Quick start guide

You will need to supply your own battery cables, lugs, and mounting hardware.

What You Need for Installation

Tools

• Wire strippers
• Crimp tool suitable for your cable lug size
• Spanners or socket set (M10 for shunt bolts, plus whatever fits your battery terminals)
• Multimeter
• Heat gun for heat shrink
• Drill and screws for mounting (if securing to a surface)

Additional Materials

• Negative battery cable (from battery to shunt) — same gauge as your existing system negative cable
• Cable from shunt to negative bus bar — same gauge
• Ring terminal lugs (sized for your cable and M10 bolts)
• Adhesive-lined heat shrink
• Cable ties or P-clips for securing cables
• Short length of thin cable for the positive sense wire if the included one is too short

Step 1: Plan the Shunt Location

The SmartShunt must be installed in the negative battery cable, between the battery negative terminal and the negative bus bar (or common ground point). Every single negative connection in your system must pass through the shunt — this is essential for accurate readings.

Ideal placement:

• As close to the battery as practical
• Accessible for wiring and future maintenance
• On a flat, solid surface where it can be securely mounted
• Within Bluetooth range (~5-10m) of where you will typically use your phone

The shunt itself is a solid metal bar, roughly 120mm x 50mm x 25mm. It does not need ventilation but should be kept dry.

Step 2: Disconnect Everything

Before touching any wiring:

1. Turn off all loads (lights, fridge, inverter).
2. Disconnect all charging sources (solar isolator, DC-DC charger, shore power).
3. Disconnect the battery negative terminal.
4. Disconnect the battery positive terminal.
5. Verify zero voltage at the battery terminals with a multimeter.

Never work on the negative side while the positive is still connected — this prevents accidental shorts through tools or chassis contact.

Step 3: Install the Shunt

The shunt has two sides, clearly marked:

• BATTERY side — this connects to the battery negative terminal only
• SYSTEM side — this connects to your negative bus bar and all system grounds

Wiring Sequence

1. Battery to shunt: Run a cable from the battery negative terminal to the BATTERY side of the shunt. Use the same cable gauge as your main system cable (typically 35-50mm² for most campervan systems). Crimp ring terminal lugs on both ends and secure with the M10 bolt on the shunt's BATTERY side.

2. Shunt to negative bus bar: Run a cable from the SYSTEM side of the shunt to your negative bus bar. Again, same cable gauge. Crimp ring terminal lugs and secure with the M10 bolt on the SYSTEM side.

3. All other negative connections must go to the bus bar, NOT directly to the battery. This includes:

   • Inverter negative
   • DC-DC charger negative
   • Solar charge controller negative
   • 12V distribution panel negative
   • Any earth/ground connections

Step 4: Connect the Positive Sense Wire

The SmartShunt needs to measure battery voltage. The included red positive sense wire connects from the shunt's small terminal block to the battery positive terminal (or positive bus bar).

1. Route the red wire from the shunt to the battery positive terminal.
2. The wire has an inline 1A fuse — do not bypass this.
3. Secure the ring terminal to the battery positive (or to a fused positive bus bar connection).
4. Keep this wire tidy and away from high-current cables.

Step 5: Connect the Bluetooth Module

The Bluetooth Smart module comes pre-connected to the shunt via an RJ12 cable. If it has been disconnected:

1. Plug the RJ12 cable into the port on the shunt.
2. Plug the other end into the Bluetooth module.
3. Mount the Bluetooth module in a location with good signal reach.

The module has a small blue LED that blinks when powered on and advertising for Bluetooth connection.

Step 6: Reconnect the Battery

With everything wired:

1. Reconnect the battery positive terminal.
2. Reconnect the battery negative terminal (which now goes to the shunt).
3. The SmartShunt should power on — you will see the Bluetooth LED blinking.

Step 7: Configure via VictronConnect App

Download the VictronConnect app (iOS or Android) and pair with your SmartShunt.

Initial Pairing

1. Open VictronConnect.
2. The SmartShunt should appear in the device list as "SmartShunt HQ..." with a serial number.
3. Tap to connect. The default PIN is 000000.
4. You will see the main dashboard with voltage, current, and state of charge.

Battery Settings

Go to Settings > Battery and configure:

Battery capacity: Enter your total battery bank capacity in Ah. If you have a single 200Ah battery, enter 200. If you have two 200Ah in parallel, enter 400.

Charged voltage: The voltage at which the SmartShunt considers the battery fully charged.

• For LiFePO4: 14.2V (or your charger's absorption voltage)
• For AGM: 14.4V

Tail current: The current threshold (as a percentage of capacity) below which the battery is considered fully charged, provided it has also reached the charged voltage.

• For LiFePO4: 2-4% (4A-8A for a 200Ah battery)
• For AGM: 3-4%

Charged detection time: How long the battery must stay above the charged voltage and below the tail current before the monitor synchronises to 100%.

• Default: 3 minutes. This works well for most setups.

Peukert exponent:

• For LiFePO4: 1.05 (lithium batteries have very low Peukert effect)
• For AGM: 1.25 (lead-acid batteries lose capacity at higher discharge rates)

Charge efficiency factor:

• For LiFePO4: 99%
• For AGM: 90-95%

Relay Settings (Optional)

The SmartShunt has a programmable relay output that can trigger external devices (like an alarm buzzer or LED) based on conditions you set — low state of charge, low voltage, or high current. Configure these if you want automated alerts.

Step 8: Verify Readings

With the system running:

1. Voltage check: Compare the SmartShunt voltage reading with a multimeter at the battery terminals. They should agree within 0.05V.

2. Current check: Turn on a known load (like a 10A device). The SmartShunt should show approximately -10A current draw. Turn it off — current should return to near zero.

3. Charging check: Activate a charging source. Current should show as positive (charging). Solar at midday might show +5A to +30A depending on your panel size.

4. State of charge: If the battery was fully charged before installation, the state of charge should read close to 100%. If it was not, you can manually synchronise it via the app (Settings > Battery > Synchronise SOC to 100%) when you next fully charge the battery.

Understanding the SmartShunt Dashboard

The VictronConnect app shows:

• State of charge (%): The primary reading. How full your battery is.
• Voltage (V): Battery terminal voltage.
• Current (A): Real-time current flow. Positive = charging, negative = discharging.
• Power (W): Current multiplied by voltage. Shows watts in or out.
• Consumed Ah: How many amp-hours used since last full charge.
• Time remaining: Estimated hours of use at the current discharge rate.

Historical Data

The History tab shows:

• Deepest discharge
• Last discharge depth
• Average discharge
• Number of charge cycles
• Number of full charges
• Total Ah drawn
• Minimum and maximum battery voltage
• Time since last full charge

This data is invaluable for understanding your usage patterns and diagnosing system issues.

Troubleshooting

State of Charge Shows 100% But Battery Is Not Full

The SmartShunt synchronised to 100% prematurely. This usually means the charged voltage or tail current settings are too loose. Tighten them — increase the charged voltage by 0.1V or decrease the tail current percentage.

State of Charge Drifts Over Time

The most common cause is a load or charger bypassing the shunt. Check that every negative connection goes through the shunt to the bus bar. Even a small chassis ground wire bypassing the shunt will cause drift over days.

Current Reading Shows a Small Value When Everything Is Off

A reading of 0.1-0.5A with all loads off is normal — this is the SmartShunt's own consumption plus any standby draws from charge controllers, Bluetooth modules, or inverters on standby. If you see more than 1A, investigate for parasitic draws.

Bluetooth Connection Drops

Ensure the Bluetooth module is not inside a metal enclosure. Metal boxes severely attenuate Bluetooth signal. Extend the RJ12 cable and mount the module outside the enclosure if needed. Also update the VictronConnect app and SmartShunt firmware to the latest versions.

Use our calculator to verify your battery bank is correctly sized for your needs, and pair it with a properly configured SmartShunt for complete system visibility.

FAQ

Can I use a SmartShunt with a non-Victron battery?

Yes. The SmartShunt works with any battery — Fogstar, Renogy, or any other brand. It simply measures current flow through the shunt and battery voltage. No brand-specific communication is required.

Do I need a SmartShunt if I have a Victron battery with Bluetooth?

The Victron battery's built-in Bluetooth shows cell voltages and BMS status, which is useful. But the SmartShunt provides significantly more accurate state of charge tracking through coulomb counting, plus historical data, time remaining, and power readings. We recommend having both.

Can I install two SmartShunts for two separate battery banks?

Yes. Each SmartShunt monitors one battery bank independently. You can view both in the VictronConnect app.

What is the difference between the SmartShunt and the BMV-712?

The SmartShunt is the shunt plus Bluetooth module — you view everything on your phone. The BMV-712 is the same shunt plus a wired display panel that mounts in your van. The core monitoring is identical. The BMV-712 costs about £70-£80 more for the added display.