A shunt is the most accurate way to monitor a battery bank, and this Bluetooth battery monitor shunt from Victron takes the guesswork out of tracking state of charge by measuring current directly rather than estimating it from voltage alone. Voltage-based monitors get less accurate as your battery ages; a shunt-based system stays accurate for the life of the battery.
The 500 amp rating covers the vast majority of DIY solar setups, from a single battery RV system up to a decent-sized off-grid battery bank. Pairing it with the free VictronConnect app over Bluetooth means you get real-time state of charge, current draw, and time-to-empty estimates without running a wired display panel.
If you’re new to system monitoring or trying to decide what’s worth tracking beyond basic battery percentage, our Solar Monitoring: Track Your DIY System Like a Pro covers the metrics that actually help you catch problems early.
Installation does take a bit more care than a simple voltage meter — the shunt has to be wired into the negative battery cable in a specific location — but once it’s in place, this Bluetooth battery monitor shunt gives you a level of insight that voltage-only monitors simply can’t match.
If you already run a Victron Cerbo GX or color control display, this shunt drops right into that ecosystem instead of requiring a separate app. Keep in mind it monitors the battery bank as a whole rather than individual cells, so pair it with a smart BMS if you also want cell-level diagnostics.