Victron BMV-712 Smart Battery Monitor with Bluetooth

The gold-standard shunt-based battery monitor — know exactly how many amp-hours are left before the fridge shuts off, not "kind of, sort of."

Key Specs

• 500A precision shunt for accurate current measurement
• Bluetooth built in — pairs with the VictronConnect app
• Reads voltage, current, power, state-of-charge, time-to-go, consumed Ah
• Supports lead-acid, AGM, gel, and lithium chemistries
• Secondary input for a starter battery voltage or midpoint monitoring
• Programmable alarms and relay output for load disconnect
• 52 mm round display fits standard gauge cutouts

Why we picked this

If you're running a real 12V system, guessing state-of-charge from voltage alone is a mistake. The BMV-712 is bulletproof, plays nice with any Victron gear you add later, and the app is genuinely useful for tracking daily consumption over time.

Buy elsewhere?

Also carried by RV solar shops. Amazon is usually price-competitive and lets you knock out delivery in two days.