How to Wire a Victron SmartShunt + LiFePO4 Settings

If you want to wire a Victron SmartShunt correctly, there is one rule that matters more than anything else: every negative connection in your system must go through the shunt. Get that right, and set a handful of lithium-specific values in the app, and the SmartShunt gives you an accurate fuel gauge for your battery. This guide covers both, using Victron’s SmartShunt manual and the most-watched install videos.

Electrical work can be dangerous: follow the manual, fuse and size every cable correctly, and use a licensed electrician for anything connected to household wiring.

Will Prowse’s beginner SmartShunt install.

How to Wire a Victron SmartShunt: Step by Step

Disconnect the battery and remove any loads or chargers from the negative terminal.
Battery negative to the “BATTERY MINUS” side of the shunt, using cable sized for your largest current.
System negative to the “SYSTEM MINUS” side: this goes to your negative busbar, which feeds every load and charger.
Connect the red fused power cable (included) from the shunt’s small terminal to battery positive.
Optional aux cable: second fused cable to a starter battery, a midpoint, or a temperature sensor.
Reconnect and pair with the VictronConnect app.

The most common mistake we found in comments: a load or charger wired straight to the battery negative. The shunt can’t see that current, so the state of charge drifts.

SmartShunt Settings for LiFePO4

Victron’s manual says the factory defaults generally work for LiFePO4, except for four settings:

Setting	Victron’s LiFePO4 guidance
Battery capacity	Your bank’s Ah rating
Peukert exponent	1.05, unless your battery supplier says otherwise
Charge efficiency factor	99%
Discharge floor	10–20%, unless your battery supplier says otherwise
Tail current	Set higher if your charger stops charging above the default tail current

Also check charged voltage. Victron’s manual lists 13.2V as the recommended charged voltage for 12V lead-acid. Commenters with lithium point out that if charged voltage is set too low, the shunt can call the battery full too early, so set it to match your lithium charger’s settings and your battery maker’s guidance.

Synchronizing to 100%

The shunt resets itself to 100% when charged voltage, tail current and charged detection time are all met. If your SOC drifts, check those three settings first, then do a full charge. You can also sync manually in the app.

Lithium Storage Warning From the Manual

Victron warns that small standing loads can slowly drain a lithium battery after a low-voltage shutdown, and that this damage can be permanent. If you leave a system unattended for a long time, disconnect the battery positive.

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Buy: Victron SmartShunt 500A on Amazon or the waterproof SmartShunt IP65 500A on Amazon.

Example Wiring: A Van With a MultiPlus, MPPT and Orion

Device	Positive connects to	Negative connects to
MultiPlus 12/3000	Positive busbar (fused)	Negative busbar (system side of shunt)
SmartSolar MPPT 100/30	Positive busbar (fused)	Negative busbar
Orion XS 12/12-50A	Positive busbar (fused)	Negative busbar
DC fuse box	Positive busbar (fused)	Negative busbar
Battery	Main fuse to positive busbar	SmartShunt BATTERY MINUS

Nothing connects to the battery negative except the shunt. That’s how the SmartShunt sees every amp in and out.

Cable Sizing for the Shunt

The cables to and from the shunt carry the full system current, so size them like your main battery cables. The SmartShunt is offered in 300A, 500A, 1000A and 2000A versions; choose one that covers your largest continuous current with margin, such as the 500A for a 12V 3,000VA inverter system.

Using the SmartShunt With Other Victron Gear

VE.Smart Networking: shares battery voltage, current and temperature with MPPTs and Orion chargers over Bluetooth, so they charge using accurate battery data.
Cerbo GX: connects with a VE.Direct cable, so state of charge shows on the GX display and VRM.
Instant Readout: shows state of charge in the VictronConnect device list without connecting.

Setting Up Alarms

In VictronConnect, set alarms for low state of charge and low voltage. For example, an alarm at 20% state of charge gives a warning well before a lithium battery’s BMS would disconnect (example value). The SmartShunt has no relay or display of its own, so the alarm shows in the app and on a GX device.

Checking Your Work

With all loads off, the SmartShunt should read close to 0A.
Turn on a known load, such as a light, and check the current reading makes sense.
Start charging and check the current shows as positive.
Charge to full and confirm the shunt syncs to 100%.

SmartShunt or BMV-712?

Both measure the same way. The SmartShunt has no display and is set up and read through the app, which is often all a van or RV needs. The BMV-712 adds a display, an alarm buzzer and a relay.

FAQ

Which side of the SmartShunt goes to the battery?

The side marked BATTERY MINUS goes to the battery negative. Everything else connects to SYSTEM MINUS.

Does the SmartShunt need its own fuse?

Its small power cable includes an inline fuse. Your main battery positive still needs its own main fuse.

Can I monitor two batteries?

The aux input can read a second battery’s voltage (such as a starter battery), but state of charge is for the main bank only.

Why does my SmartShunt say 100% too early?

Usually charged voltage or tail current doesn’t match your charger. Adjust them and resync.

Does the SmartShunt work with 24V and 48V systems?

Yes. Its supply range of 6.5–70VDC covers 12V, 24V and 48V systems.

Do I need to reset it after installation?

After setup, charge the battery fully so the shunt syncs to 100% and starts from an accurate reading.

Sources: Victron SmartShunt manual (installation and configuration chapters) and SmartShunt datasheet (victronenergy.com); Will Prowse, “Victron Energy 500A Smart Shunt (Beginner Friendly)”; Current Connected, “How To Wire & Program a Victron SmartShunt for LiFePO4 Batteries”.