Caravan Battery Monitors
Battery monitors and battery guards for motorhomes – monitor the battery charge status in real time, some models connect to your phone via Bluetooth.Caravan Battery Monitors group products

Victron Energy SmallBMS NG is an advanced battery management system (BMS) specifically designed to protect and monitor Victron Lithium NG batteries (note: not compatible with Lithium Smart batteries). It provides reliable protection for lithium batteries by managing charging and load disconnections, and providing early warnings of low battery voltage.
SmallBMS NG is a simple and cost-effective alternative to the VE.Bus BMS NG system for applications where integrated control of Victron inverters or chargers is not required. It does not include a VE.Bus bus and is therefore not recommended for use with VE.Bus MultiPlus or Quattro inverters.
The product is easily connected via Bluetooth to the VictronConnect app, through which all battery information — such as charge level, current and alarms — is clearly visible without a separate SmartShunt device.
Batteries can be connected in series, parallel or a combination of the two and SmallBMS NG supports 12 V, 24 V and 48 V systems. Up to 50 batteries can be connected to the system in 12 V or 24 V groups and 25 batteries in 48 V groups, enabling large energy storage.
Batteries can be connected in series, parallel or a combination of the two, allowing for the construction of efficient 12 V, 24 V and 48 V systems:
Up to 192 kWh in 12 V system
Up to 384 kWh in a 24 V system
Up to 128 kWh in a 48 V system
SmallBMS NG is an ideal solution for the electrical protection and monitoring of lithium batteries in applications such as recreational vehicles, boats and off-grid systems where VE.Bus integration is not required.
- Controls the disconnection of loads and chargers to protect batteries from deep discharge or overvoltage.
- Pre-alarm for low battery voltage before disconnecting loads.
- External control for load and charging connections.
- Clear LED indicators for Bluetooth connection and warning status.
- Bluetooth connection and central monitoring with the VictronConnect app without additional hardware.

Victron Gx Io Extender 150
- With the Victron GX IO-Extender 150 you get a powerful extension of control and monitoring capabilities for your GX devices – e.g. Cerbo GX, Venus GX or other GX platforms. Perfect for those who want full control on their boat.
- The GX IO-Extender 150 expands your GX device with 8 digital I/O channels that can be flexibly configured as either 8 inputs, 8 outputs, or a mix (4+4).
- Expands your input and output signals with 8 digital channels
- Four PWM channels for precise control (e.g. dimming lighting or motor control)
- Double “latching relay” (bi-stable relay) that retains its last position even in the event of a power failure
- A solid-state switch
Thanks to the plug-and-play function, it is connected directly via USB, where it both receives power and communicates, without any additional cabling or power supply. With the help of flexible configuration, you can decide for yourself which of the digital channels will function as inputs or outputs, easily adjusted via DIP switches. For those who want to take the next step in control and monitoring, the device offers full compatibility with Node-RED, which makes it possible to build your own flows for automation, alarm management and system logic. As always with Victron Energy, you can count on high quality, long life and reliable support. The device is also built to withstand real-world conditions, with an operating temperature from -20 °C to +50 °C, making it robust enough even in more demanding environments.
Do you need more control signals than standard from GX? Do you want to automate lighting, ventilation, pumps or other systems? Then you have found the right product.
See More info for technical data.
- Additional control
- Expand your GX device
- Automation

The Smartshunt 300A IP65 is a battery monitor that uses your phone as a display instead of an integrated screen. The Smartshunt connects to the VictronConnect app on your phone or tablet via Bluetooth, allowing you to check all monitored battery parameters such as charge status, remaining time, history data and more.
Smartshunt 300A IP65 can also be connected and read via a GX device. Connection to the Smartshunt is easy with a VE.Direct cable.
The Smartshunt is an excellent alternative to the BMV battery monitor, especially in systems where battery monitoring is required but where you want to reduce cables and clutter. It is equipped with Bluetooth, a VE.Direct port and a connection that can be used to monitor a second battery, a midpoint monitor or a temperature sensor.
- Waterproof IP65 rating
- 300A/50mV
- The phone acts as a display

SmartShunt is a versatile battery monitor that doesn't have its own display, as your phone acts as the display. SmartShunt connects wirelessly via Bluetooth to the VictronConnect App installed on your phone (or tablet). You can conveniently read all the variables you want to monitor, such as battery charge status, available charge (time remaining at current power consumption), historical data and much more.
Alternatively, you can connect the SmartShunt to the GX device and read the data on its display. The connection between the SmartShunt and the GX device is made using the VE.Direct cable.
SmartShunt is a good alternative to the BMV battery monitor, especially in systems where a battery monitor is needed but you want to avoid extra cabling. SmartShunt is equipped with Bluetooth connectivity, VE.Direct bus and a connection that can be used for monitoring a second battery, center point monitoring or to which it is possible to connect a temperature sensor.
- Battery monitoring
- 300A/50mV
- The phone acts as a display

MK3-USB allows the following products to be connected to a PC for configuration: Multi, MultiGrid, MultiPlus, MultiPlus-II, Quattro, VE.Bus BMS V2, Inverter (only models with VE.Bus communication port), ECOmulti, EasySolar, EasyPlus.
VictronConnect is the perfect tool for installers who want to quickly and efficiently configure their systems after they are connected. VictronConnect makes it easy and safe to update the software of your devices.
• VE.Bus for USB connection
• Connect the Victron app to your computer
• Android, Windows and macOS X

Smart Battery Protect protects the battery(ies) from being discharged. It detects when the voltage reaches a critical level (adjustable) and switches off unnecessary loads. The critical level is adjusted directly on the device or via Bluetooth (optional). Voltage: 12/24 volts. Maximum continuous load: 100 amps. Peak load (up to 30 seconds): 600 amps. Connection: M8. Dimensions: 59x42x115mm. Weight: 500 grams.
• Built-in Bluetooth
• 100A
• For AGM, gel, lead and lithium batteries

Cerbo GX is a completely new communication hub that gives you full control of your systems, wherever you are, and maximizes their performance. You can easily connect via the Victron Remote Management (VRM) portal or get direct access using the 5” GX Touch 50 multifunction display (sold separately), or via the Victron Connect app, as it has Bluetooth. It offers instant monitoring of battery charge status, energy consumption, solar, generator and grid energy harvesting, or tank level monitoring and temperature measurement. You can easily adjust the shore power feed current limit, (auto) start/stop the generator(s) or change all settings to optimize your system. Monitor alarms, perform diagnostics and resolve challenges remotely.
Cerbo GX maximizes the performance of your system components in real time and keeps them in perfect synchrony. With its dual core processor and additional CAN bus port, you can now support even larger systems and monitor regulated (lithium) batteries up close, while the second port can support up to 25 simultaneous VE.Can solar panel chargers. The new NMEA 2000 support output easily integrates the GX into any boat network. Four tank slots and four temperature slots, along with three VE.Direct ports, three USB ports, four digital inputs and two relays, allow you to take control to the next level. Cerbo GX is easily mounted on a DIN rail, and its separate touchscreen can be mounted on top of the panel, eliminating the need to create complete cutouts, and it connects with just one cable, saving you the hassle of connecting multiple cables to the panel. The new Bluetooth function allows for quick connection of the device via the Victron Connect app. The GX Touch 50 is a display for the Cerbo GX (sold separately). The 5-inch touchscreen gives you a direct overview of your system and allows you to change settings in an instant. Easily connect the display to the Cerbo GX with just one cable. It is waterproof, top-mountable and easy to install.
• Multifunction display
• Bluetooth
• NMEA2000 compatible

The GX Touch 50 is the display for the Cerbo GX. The 5-inch touchscreen gives you a direct overview of your system and allows you to change settings in an instant. Easily connect the display to the Cerbo GX with just one cable. It is waterproof, has a top-mounted mount and is easy to install, giving you the flexibility to create a clean and clear panel.
• 5" touchscreen
• Cable length
• Dimensions: 87x128x12.4mm

Monitor your boat anywhere, anytime! The GlobalLink 520 is a 4G-enabled device that enables monitoring of SmartShunt, BMV battery monitor, MPPT controller, charger and Phoenix inverters with VE.Direct connections via Victron's VRM portal.
Victron Remote Management The Victron Remote Management (VRM) web portal gives you full access to your equipment on board, anywhere, anytime.
In VRM, you can check the status of connected devices, view detailed historical graphs of your energy, create detailed analytical reports, and set up automatic alerts.
The GlobalLink 520 has two VE.Direct ports.
These allow you to connect the device to two VE.Direct devices, such as a BMV battery monitor and an MPPT controller directly to the VRM.
It has two digital inputs that also function as a heart rate monitor and remote control relay, making it the perfect solution for monitoring and controlling boat installations such as a heater and refrigerator.
Built-in antenna designed to work worldwide.
If you need better reception, you can install an external antenna.
Can be powered directly from a battery bank and operates between 8V and 70V.
Average current relay open:
12V 20mA
24V 10mA
48V 5mA
Average current with relay closed:
12V 40mA
24V 20mA
48V 10mA
No monthly fees or subscriptions for the first five years.
Contain:
GlobalLink 520
1.5 m power cable with 1A fuse and M10 eyelet
2 terminal blocks
• Battery monitoring
• Built-in antenna
• Connects to 4G

BMW-700 - Highly accurate battery monitor. With basic battery monitor functions, it calculates the consumed ampere-hours and displays the charge status of two batteries.
In addition to basic display options such as voltage, current, and amp-hours used, it also displays charge status, remaining time, and power consumption in watts.
Features:
Displays battery voltage, amps, amp hours, consumption and charging status
Displays the remaining time at the current discharge rate
Programmable visual and audible alarms
Programmable relay (for shutting down non-critical loads or starting the generator when needed)
VE.Direct communication port
Stores a large number of historical events that can be used to assess consumption patterns and battery health
Wide voltage range 9.5-95V
Current measurement with high resolution rendering. 10mA (0.01A)
Low power consumption: 2.9Ah per month (4mA) @12V and 2.2Ah per month (3mA) @ 24V
Number of batteries: 1
Includes 500 amp shunt and connection kit
- Battery monitoring
- 1 battery
- Programmable relay

With built-in Bluetooth, the BMV Smart is ready for networking (IoT). Bluetooth is implemented in most other Victron Energy products, so wireless communication between products simplifies system installation and improves performance.
In addition to the basic display options of voltage, current, and amp-hours used, it also displays the charge status, remaining time, and power consumption in watts for battery bank 1. For battery bank 2, it only measures voltage.
Features:
Displays battery voltage, amps, amp hours, consumption and charging status.
Displays the remaining time at the current discharge rate
Programmable visual and audible alarms
Programmable relay (for shutting down non-critical loads or starting the generator when needed)
VE.Direct communication port
Records a large number of historical events that can be used to assess consumption patterns and battery health
Wide voltage range 9.5–95 V
Current measurement with high resolution rendering. 10mA (0.01A)
Low power consumption: 0.7Ah per month (1mA) @12V and 0.6Ah per month (0.8mA) @24V
Number of batteries: 2
Includes 500 amp shunt and connection kit
• Battery monitoring
• 2 batteries
• Programmable relay

With built-in Bluetooth, the BMV Smart is ready for the Internet of Things (IoT). Bluetooth is implemented in most other Victron Energy products, so wireless communication between products simplifies system installation and improves performance.
In addition to the basic display options of voltage, current, and amp-hours used, it also displays the charge status, remaining time, and power consumption in watts for battery bank 1. For battery bank 2, it only measures voltage.
Features:
Displays battery voltage, amps, amp hours, consumption and charging status
Displays the remaining time at the current discharge rate
Programmable visual and audible alarms
Programmable relay (for shutting down non-critical loads or starting the generator when needed)
VE.Direct communication port
Stores a large number of historical events that can be used to assess consumption patterns and battery health
Wide voltage range 9.5-95V
Current measurement with high resolution rendering. 10mA (0.01A)
Low power consumption: 0.7Ah per month (1mA) @12V and 0.6Ah per month (0.8mA) @24V
Number of batteries: 2
Includes 500 amp shunt and connection kit
• Battery monitoring
• 2 batteries
• Programmable relay

The Smartshunt 500 A/50mV is connected between the battery and the devices and then sends the battery status via Bluetooth to the VictronConnect app.
Smartshunt is an all-in-one battery monitor, without a display. Your phone acts as a display instead. Smartshunt connects to the VictronConnect app on your phone (or tablet) via Bluetooth and you can conveniently read all monitored battery parameters such as charge status, remaining time, historical data and much more.
Alternatively, the Smartshunt can be connected and read with a GX device. The connection to the Smartshunt is made with a VE.Direct cable.
Smartshunt is a good alternative to the BMV battery monitor, especially in systems where battery monitoring is required but less cables and clutter are desired.
Smartshunt is equipped with Bluetooth, a VE.Direct port and a connector for monitoring a second battery, center point monitoring or temperature sensor.
- Battery display
- 500A/50mV
- Battery status via Bluetooth

The Smartshunt 500A IP65 is an all-in-one battery monitor where your phone acts as a display instead of an integrated screen.
Smartshunt connects to the VictronConnect app on your phone or tablet via Bluetooth and you can read all monitored battery parameters such as charge status, remaining time, historical data and more.
Smartshunt 500A IP65 can be connected and read with a GX device. Connection to the Smartshunt is easily done with a VE.Direct cable.
Smartshunt is a good alternative to the BMV battery monitor, especially in systems where battery monitoring is required but less cables and clutter are desired.
Smartshunt is equipped with Bluetooth, a VE.Direct port and a connector for monitoring a second battery, center point monitoring or temperature sensor.
- Mains voltage range: 6.5 - 70 VDC
- Power consumption: <1 mA
- Input voltage range, auxiliary battery: 6.5 - 70 VDC
- Battery capacity (Ah): 1-9999 Ah
- Operating temperature range: -40 - +50°C
- Measure voltage second battery or temperature or center zone: Yes
- Temperature measurement range: -20~+50°C
- Victron Energy direct communication port: Yes
- Dimensions (HxWxD): 46x120x54 mm
- Shunt connection bolts: M10
- Protection class: IP65
