What SmartShunt does
Victron SmartShunt is a battery monitor without a separate built-in display.
The shunt measures current flowing into and out of the battery. VictronConnect on a phone/tablet, or a compatible GX device through VE.Direct, can then show state of charge, current, voltage, amp-hours and time-to-go.
The family performs monitoring; it does not charge the battery and it is not a BMS.
Why a family card is needed
The current SmartShunt range includes 300 A, 500 A, 1000 A and 2000 A variants.
Victron also offers standard and IP65 versions.
A camper manufacturer that says only “Victron SmartShunt” has identified the product family but not the current rating or enclosure version.
MHS therefore keeps a family card rather than assuming 500 A.
Current ratings are not battery capacity
The 300/500/1000/2000 A number describes the shunt's current class.
It does not mean the battery stores that many amp-hours.
A 500 A SmartShunt can monitor a 100 Ah, 300 Ah or larger battery bank if the complete installation is suitable. Amp rating and battery capacity are different quantities.
Standard versus IP65
Victron sells both standard and IP65 variants.
IP65 offers greater protection against dust and water exposure, but a camper source that says only SmartShunt does not prove IP65.
Do not assign the enclosure rating without the exact part number or visible label.
Bluetooth
SmartShunt includes Bluetooth for VictronConnect.
This gives convenient local access to battery information and configuration.
Bluetooth range can be reduced by metal compartments and the vehicle body. A phone connecting on the workbench does not guarantee identical range after installation.
VE.Direct
SmartShunt also provides VE.Direct communication.
Through a compatible cable it can connect to a GX device such as Cerbo GX.
That lets battery data become part of a larger Victron monitoring system.
MHS explanation.SmartShunt having VE.Direct does not prove that a Cerbo GX is fitted. The GX device needs its own evidence.
Auxiliary input
Current SmartShunt models provide an auxiliary measurement input that can be configured for purposes such as a second-battery voltage, midpoint monitoring or battery temperature with the appropriate sensor.
It is one configurable input, not three simultaneous independent channels.
The exact configuration should be checked in VictronConnect.
How SOC is calculated
SmartShunt tracks charge entering and leaving the battery over time and uses configured battery parameters to estimate state of charge.
If the configured capacity is wrong or some loads bypass the shunt, SOC can drift from reality.
That is why correct installation matters as much as measurement accuracy.
Synchronization
Battery monitors need a reliable full-charge reference.
Victron provides synchronization logic and manual configuration options.
Manually setting a monitor to 100% does not physically charge the battery. It only resets the monitor's estimate.
Time-to-go
Time-to-go is calculated from current consumption and configured discharge limits.
Turn on a large inverter load and the predicted time can drop sharply; turn it off and the prediction rises.
This is expected because the load assumptions changed.
Measurement accuracy
Current Victron SmartShunt technical data publishes high measurement accuracy for current and voltage.
MHS avoids assigning the dimensions and bolt size of one current class to an unspecified camper installation, because 300 A and 500/1000/2000 A variants are physically different.
The family-level facts are the monitoring architecture and available current classes.
Trend history
Current IP65 SmartShunt data includes stored trends for key battery metrics.
Exact history features depend on firmware/app generation.
A camper owner should keep VictronConnect current and avoid assuming every old SmartShunt has every feature shown in a newly released app.
Monitoring is not protection
SmartShunt does not replace:
- a battery BMS,
- fuses,
- contactors,
- a low-voltage disconnect,
- correctly sized cables.
A low SOC warning is information unless another device is configured to take protective action.
What to check after a battery change
Review:
- battery capacity;
- charged-voltage setting;
- tail current;
- discharge floor;
- Peukert/charge-efficiency settings where relevant;
- synchronization behavior.
A monitor can continue displaying plausible numbers after a battery replacement while being configured for the previous bank.
Where the shunt sits in the circuit
The main negative current of the monitored battery bank must pass through the shunt in the intended direction.
If an inverter, charger or DC load is connected directly to battery negative on the wrong side, that current can be invisible to the monitor.
This is a common installation reason for inaccurate SOC.
What to check in a camper
Find the exact SmartShunt rating and enclosure type.
Then verify that all relevant house-battery current passes through it.
Use VictronConnect to compare:
- resting current,
- a known load,
- a charging source.
The sign and magnitude should make sense.
nuCamp use
nuCamp documents SmartShunt battery monitoring in Cirrus lithium/electrical systems but does not always publish the 300/500/1000/2000 A suffix.
A family link is therefore accurate.
If a later manual or physical label identifies 500 A, MHS can replace the family relation with the exact 500 A card already in the database.
Exact 500 A card remains useful
MHS already has a verified SmartShunt 500 A / 50 mV component card.
That card contains model-specific dimensions and ratings.
The family card prevents a camper with an unknown SmartShunt rating from being incorrectly promoted to the 500 A version.
Key takeaway
SmartShunt is a display-less battery-monitor family with Bluetooth and VE.Direct. When the camper does not publish the current rating, MHS confirms the family but keeps 300/500/1000/2000 A and IP21/IP65 details unknown.
Sources
Family-level SmartShunt card. Exact current rating and enclosure type are intentionally withheld when camper evidence names only the product family.