Victron Battery Monitoring and Battery Protection
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Monitoring and Protection: Two Tasks, Different Devices
In this category, you’ll find two types of devices. Battery monitors measure —they show you how full your battery is. Battery Protect and BMS devices switch —they disconnect loads or chargers before your battery is damaged.
- SmartShunt and BMV measure: They track the current flowing into and out of the battery and use that data to calculate the state of charge as a percentage.
- Battery Protect protects: It disconnects loads from the battery when the voltage drops too low.
- BMS protects: It monitors Victron lithium batteries and shuts off chargers and loads if a cell is too full, too low, or too cold.
- Battery Balancer balances: It keeps the voltage equal between lead-acid batteries connected in series.
SmartShunt or BMV?
A Victron battery monitor like the SmartShunt or a BMV battery monitor shows you your battery’s state of charge, current, and remaining runtime at any time. Victron Battery Protect safeguards against deep discharge—it disconnects the loads when the voltage drops too low.
Both are full-featured battery monitors and provide equally accurate measurements. The SmartShunt has no display—you can read its data via Bluetooth in the VictronConnect app or through a Cerbo GX. The BMV has a display designed for installation in a wall or on the dashboard. The BMV-702 models also measure the voltage of a second battery, such as the starter battery.
Lynx: Battery Monitoring for Large Systems
In larger systems, the Victron Lynx system connects batteries, fuses, shunts, and BMS units on a common busbar rated up to 1,000 A. The Lynx Smart BMS combines a BMS, battery monitor, and main disconnect switch in one unit.
All devices can be connected to a Cerbo GX for operation and system monitoring. You can then view your battery’s readings remotely via the VRM portal.
FAQ – Frequently Asked Questions About Victron Battery Monitoring
What does a battery monitor or battery computer do?
A battery monitor measures the current flowing into and out of your battery. It uses this data to calculate the state of charge as a percentage and the remaining runtime. It only measures—only a Battery Protect or a BMS protects against deep discharge.
How do you connect a SmartShunt or BMV?
The shunt goes in the negative wire: one end connects to the battery’s negative terminal, and the other end connects to all loads and chargers. A thin measurement wire with a fuse connects the shunt to the positive terminal. Follow the instructions and disconnect the battery from all loads beforehand. If you’re unsure, have a qualified professional perform the installation.
Why does the voltage of lithium batteries hardly indicate the state of charge?
The voltage of a LiFePO4 battery remains almost constant over a large portion of its capacity. Therefore, you cannot tell how full it is based on the voltage alone. A shunt measures the current and shows you the true state of charge.
What does the Victron Battery Protect do?
The Battery Protect disconnects the loads from the battery as soon as the voltage drops below a configurable threshold. This protects the battery from deep discharge. Models are available for 65, 100, and 220 A, as well as one for 48V.
Do I need a BMS for my lithium battery?
The Victron LiFePO4 Smart and Lithium NG batteries require an external Victron BMS. Batteries with a built-in BMS, such as the Victron SuperPack, do not need one. Learn more in the Victron Lithium Batteries category.
Can I view the readings on my smartphone?
Yes. The SmartShunt, Lynx Smart BMS, and many other devices have built-in Bluetooth and display their readings in the VictronConnect app. You can also view them remotely via a Cerbo GX.
Why do I need a battery balancer?
If you connect two 12V lead-acid batteries in series to create a 24V system, their voltages will drift apart over time. The balancer compensates for this, thereby extending the service life of both batteries.
You can find battery monitors from other manufacturers in the Battery Monitors category.