Voltage guesses the state of charge; a shunt counts it · review
Victron Energy SmartShunt 300 A 50 mV, Bluetooth, no display review
A 300 A shunt monitor with no display of its own, reading out over Bluetooth to VictronConnect, with a VE.Direct port and an input for a second battery or a temperature sensor.
The bottom line The only monitor here that watches the midpoint of a series bank and keeps historical data, integrating into a wider system through VE.Direct. It has no display at all, which is a deliberate design rather than an omission.
A 300 A shunt with no screen and a great deal of memory.
The midpoint
An additional connection for monitoring a second battery, a midpoint or a temperature sensor. Midpoint monitoring watches the middle of a series bank, where an imbalance appears long before a failure. Five monitors in this family and one offers it.
The history
State of charge, time remaining and historical data in VictronConnect. A live reading tells you now; a history tells you that the bank has been arriving at morning lower each week. That is what identifies a problem while it is still small.
No display
Deliberate. The phone is the display, and the shunt is a box in a locker. On a boat or a van that removes a panel cut-out and a run of cable; in a workshop where several people read it, it does not.
Shunt tolerance, left unsaid
Chemistries. Accuracy. Self-consumption. Alarms. Four lines that the cheaper ECO-WORTHY and Renogy monitors in this family fill at least partly.
Availability
German, French, Italian and Spanish Amazon stores quoted 67 € to 73 € when this page was compiled.
American and British Amazon stores carry it too, priced in their own currency, which the euro range above deliberately omits.
These figures are what Keepa reported on the day this page was last updated. Availability and pricing move without notice.
Prices quoted in this text were read on 16 September 2026. The live price is at the top of the page.
What it gets right, and what it leaves out
Strengths
Historical data rather than only live values, which is what identifies a developing problem
A midpoint monitoring input, for detecting an imbalance in a series bank
VE.Direct for integration into a wider Victron installation
Compromises
No display of its own — without a phone there is no reading at all
No self-consumption figure
No chemistries named and no accuracy figure
Specifications
Measurement method
Shunt-based, 50 mV, from the title
Shunt rating
300 A at 50 mV, from the title
Accuracy
Absent as a figure; described as precise and reliable in the first bullet
Chemistries
Nowhere in the listing
Display
None — the SmartShunt has no screen, and the phone application is the display
App
VictronConnect over Bluetooth, showing state of charge, time remaining and historical data, second bullet
Alarms
Nowhere in the listing
Self-consumption
Nowhere in the listing
Installation requirements
A VE.Direct port and an additional connection for a second battery, a midpoint or a temperature sensor, third bullet
Amazon reference
B0DJ2P2XN5 (same reference on 6 Amazon marketplaces)
EAN
8719076065708
Questions owners ask about this one
What is midpoint monitoring?
Measuring the voltage at the middle of a series bank, so a cell or battery drifting out of balance can be seen before it fails. On a bank of four batteries in series that is the early warning nothing else in this family offers.
Is having no display a problem?
It depends where the monitor is. On a boat or a van where a phone is always to hand, it removes a panel cut-out and a cable. Where the reading should be visible to anyone, it is a limitation — and the ECO-WORTHY in this family has a colour touchscreen.
shunt-based counting · 300 A shunt · accuracy not published · chemistries not named, custom parameters supported · 3.5-inch colour touchscreen with adjustable brightness · no app named · voltage, current and temperature alarms · 0.5 mA self-consumption, PUBLISHED · installation requirements not described
A 300 A shunt monitor with a 3.5-inch colour touchscreen and a published self-consumption of 0.5 mA — the only self-consumption figure in this catalogue.
Best for: A system where the monitor itself must not be part of the standing drain.
shunt-based counting · 500 A shunt, M8 connection · accuracy not published · LiFePO4, lithium-ion, AGM, gel and lead-acid · backlit LCD · no app named · flashing display and buzzer every 10 seconds at a set threshold · self-consumption not published · 0–9999 Ah capacity range
A 500 A shunt monitor for 8 to 120 V systems with M8 terminals, five named chemistries, a capacity range to 9999 Ah and a backlit LCD with a buzzer alarm.
Best for: A large mixed-chemistry installation where the terminal size has to be known in advance.
shunt-based counting · 500 A shunt · accuracy described as high, no figure · LiFePO4, AGM, sealed, gel and flooded · display included · no app named · programmable high and low voltage alarm · self-consumption not published · installation requirements not described
A 500 A shunt battery monitor for 12 to 48 V systems with a programmable high and low capacity alarm, custom battery parameters and a memory that survives a power interruption.
Best for: A bank whose chemistry is unusual enough to need custom parameters.
