If the part number on your Renogy battery monitor is 5217126, compare it with the Smart Shunt 300 in this guide. The shunt monitors the battery-negative path and communicates wirelessly to its compatible app; it is not a plug-in replacement for Go Power's wired GP-BMK-25 display.
Identify battery side and system side
Install the current shunt between the battery negative terminal and the common RV negative return. Every charging and load return must travel through the shunt for complete battery-current measurement; do not connect an inverter or charging return around the device.
Distinguish the 300A rating from peak current
The Smart Shunt 300 is rated for 300A continuous current. Renogy separately specifies a 500A short-duration peak. These ratings should not be confused, and a high-current inverter system must remain within the shunt's continuous rating.
| Reference | What to check |
|---|---|
| Current rating | 300A continuous; 500A peak for 10 seconds, not 500A continuous |
| Current measurement | Measures the current entering and leaving the battery through its negative-side shunt |
| Bluetooth monitoring | Renogy DC Home and supported Renogy ONE monitoring functions |
| Battery-negative routing | The battery side of the shunt connects to battery negative; system returns connect on the opposite side |
| Battery state of charge | Requires correct setup of battery capacity and monitoring parameters in the app |
The Bluetooth app shows charging and discharging data and supports configuration of battery capacity and alarm parameters. The device does not supply charging current or power an inverter by itself.
Choose the correct battery monitoring system
Unlike a wired display monitor, the Renogy shunt uses Bluetooth. The Go Power GP-BMK-25 uses its own shunt and display cable; PowerTrak 84025 uses RV-C data cables. These are separate product families and their displays, communication cables and shunts are not interchangeable without verified manufacturer documentation.
Product photos and other monitoring choices
The product cards link to exact-number listings in this store. Choose based on the model actually installed rather than the appearance of the housing.
Renogy original wiring diagram
Renogy's Smart Shunt 300 instruction manual provides the factory battery connection layout, actual terminals, installation precautions and app setup. Use its model-specific illustration for physical wiring instead of the simplified component locator above.
Renogy Smart Shunt 300 user manual and installation drawing (PDF)