Renogy Battery Shunt 300 Bluetooth battery monitor — 300A current, SOC tracking and app logging

The Renogy Battery Shunt 300 is a compact shunt and Bluetooth-enabled monitor that measures battery current, voltage, state of charge, and logs historical data for remote tracking via the DC Home app.

Designed for off-grid systems, RVs, marine setups, and backup power installations, the Renogy Battery Shunt 300 lets you watch real-time battery performance and review past usage to optimize charging and prevent unexpected depletion. It works with a wide range of battery chemistries and connects wirelessly to Renogy ONE or directly over Bluetooth so you can check status from your phone or tablet.

How does the shunt measure battery usage and state of charge?

The shunt sits in-line with the battery negative and accurately senses current flow to calculate amp-hours consumed or restored. Combined with voltage readings and temperature compensation, the device estimates state of charge and displays cumulative energy used.

• 300 A continuous current measurement capacity for most battery banks
• High-resolution current sensing for charge and discharge tracking
• Voltage monitoring to support SOC calculation
• Temperature input to adjust readings for accuracy

Can I monitor batteries remotely and see historical trends?

Yes — the Shunt 300 streams data to the DC Home app via Bluetooth and integrates with Renogy ONE for remote access. The app stores historical logs and issues alerts for abnormal conditions so you can review usage patterns and respond if thresholds are exceeded.

• Bluetooth connectivity for local wireless monitoring
• App-based historical graphing and event logs
• Alerts for over/under voltage and abnormal behavior
• Compatibility with Renogy ONE gateway for cloud access

What battery types and setups is this compatible with?

The unit supports common battery chemistries used in mobile and stationary systems, including lead‑acid (AGM, GEL), lithium iron phosphate (LiFePO4), lithium‑ion, and nickel‑metal hybrid packs. It is suitable for single‑bank and multi‑bank installations when used as part of a system monitoring strategy.

• Works with starter and deep‑cycle batteries
• Selectable battery profiles for accurate state-of-charge estimation
• Temperature sensor included for thermal compensation
• Note: not compatible with Renogy ONE M1 currently

How is the device installed and maintained?

Installation involves mounting the shunt inline on the battery negative terminal and connecting the monitoring cable to your system and temperature sensor. Once wired, pair it with the DC Home app; minimal maintenance is required beyond periodic checks of connections and firmware updates through the app.

• Inline negative terminal mounting with included hardware
• Simple wiring to battery, load, and monitoring port
• Temperature probe placement on battery case for accurate readings
• Firmware and app updates for improved features and stability

Who is this for: The Renogy Battery Shunt 300 is ideal for DIY solar installers, van and RV owners, boat electrics hobbyists, and anyone managing backup power systems who needs reliable current measurement, remote monitoring via app, and historical battery use data. It’s a practical upgrade if you want better insight into system performance and longer battery life through informed charging and usage decisions.