Renogy Battery Shunt 300 Quick Guide

Before Getting Started

This quick guide provides important operation and maintenance instructions for the Renogy Battery Shunt 300 (referred to as the shunt). Read it carefully before operation and save it for future reference. Failure to observe instructions or precautions may result in electrical shock, serious injury, or death, or damage to the shunt, rendering it inoperable.

• Renogy ensures the accuracy, sufficiency, and applicability of information at the time of printing, subject to product improvements.
• Renogy assumes no responsibility for losses caused by user's failure to install or use the product in compliance with the guide.
• Renogy is not liable for damage or injury from repair attempts by unqualified personnel, improper installation, or inappropriate operation.
• Illustrations are for demonstration purposes only and may vary slightly by product revision or region.
• Renogy reserves the right to change information without notice. For the latest guide, visit renogy.com.

What's In the Box?

Ensure all accessories are complete and free of any signs of damage.

• Renogy Battery Shunt 300 x 1
• Quick Guide x 1
• ST4 x 18 mm Mounting Screws x 3 (1 extra)
• 3/8 in (M10) B1/B2 Wires (1m) (22 AWG) x 2
• Temperature Sensor (1.5m) x 1

Dimensions

The shunt has dimensions of 5.27 inches (134 mm) in width, 3.82 inches (97 mm) in height, and 0.87 inches (22 mm) in depth. The dimension tolerance is ±0.2 inches (0.5 mm).

Get to Know Renogy Battery Shunt 300

Exterior

The exterior features an Upper Cover, Lower Cover, Mounting Holes, B- Terminal, B1 and B2 Terminals, Battery Temperature Sensor (T1) Port, P- Terminal, Power LED Indicator, Bluetooth LED Indicator, and a RESET Button.

Interior (with the covers removed)

The interior reveals the B- Terminal (M10), B1 and B2 Terminals, Battery Temperature Sensor (T1) Port, and P- Terminal (M10).

Renogy Battery Shunt 300 System Setup

The diagram illustrates the system setup. The shunt connects to the Main Battery via the B- (negative) and B1 (positive) terminals. An optional Starter Battery can be connected via the B2 terminal. Loads, Chargers, and Inverters connect via the P- terminal and the AUX BAT+/BAT- terminals of a connected device.

The AUX BAT+ and AUX BAT- refer to the terminals of a specific device through which it connects to the positive and negative terminals of an auxiliary battery, respectively.

The Battery Shunt 300 can be connected to a starter battery via the B2 port when needed.

Required Tools & Accessories

Prior to installation and configuration, prepare the recommended tools, components, and accessories.

• Wrench (11/16 in)
• Phillips Screwdriver (#1)
• Slotted Screwdriver (1 mm)
• Insulating Gloves ?
• Wire stripper
• Manual Hydraulic Pliers
• Heat Gun
• Heat Shrink Tubing
• Bare Wires x 2
• 3/8 in Lugs (M10 Ring Terminals) x 2

For instructions on using wire stripping, heat shrink tubing, manual hydraulic pliers, and heat guns to install 3/8 in Lugs (M10 Ring Terminals), visit renogy.com/support/downloads.

How to Size Bare Wires?

Select proper bare wires based on the ampacity required for your power system. Refer to the table for copper cable ampacities with different gauge sizes.

These values are from NEC Table 310.17 for copper cables rated at 194°F (90°C) operating at ambient temperatures up to 86°F (30°C). Cables longer than 13 feet (4000 mm) may need thicker gauge wires to prevent excessive voltage drop.

Check System Voltage and Current

Ensure the battery shunt operates within a system voltage of 120V and a continuous current up to 300A. Exceeding these limits can damage the shunt.

⚠️ Risk of electric shock! Before installing, turn off all devices and ensure no current is flowing through the circuit.

How to Install 3/8 in Lugs on Battery Tray Cables?

The process involves preparing the cable end, sliding on heat shrink tubing, inserting the wire into the lug, crimping the lug, and applying heat to the tubing.

1. Prepare cable end: Strip approximately 0.4 in (10 mm) of insulation.
2. Slide on heat shrink tubing.
3. Insert wire into the lug.
4. Crimp the lug using manual hydraulic pliers.
5. Ensure the lug is securely attached.
6. Apply heat from a heat gun to the heat shrink tubing to seal it.

If a suitable battery tray cable is unavailable, you can customize one using heat shrink tube and a bare wire.

Step 1. Plan a Mounting Site

Select a proper mounting site for safe connection to the battery and other devices. Install the shunt in a clean, cool, and dry location, free from water, oil, or dirt. For optimal Bluetooth communication, avoid placing the shunt near metal objects.

Environmental considerations: Keep dry ?, handle with care ⚠️, ensure ventilation ?️. Operating temperature range: 14°F to 122°F (-10°C to 50°C). Humidity range: 0% to 95%.

Step 2. Wear Insulating Gloves

Wear proper insulating gloves ? for safety during installation.

Step 3. Remove the Covers

Remove the Upper Cover

Use a screwdriver to detach the upper cover.

Remove the Lower Cover

Use a screwdriver to detach the lower cover.

Step 4. Connect the Shunt to the Main Battery Negative

STEP-1 Install the bare wire on the shunt B- terminal.

Connect the negative wire to the B- terminal of the shunt. Torque specification: 173.5–224.8 in-lbs (19.6–25.4 N•m).

STEP-2 Install the bare wire on the battery negative.

Connect the other end of the negative wire to the negative terminal of the main battery.

Note: Connecting other devices to the B- terminal may affect the shunt's accuracy in current detection.

For connecting batteries in series or parallel, refer to the Battery Shunt User Manual at renogy.com/support/downloads.

Step 5. Connect the Shunt to the Device AUX BAT-

STEP-1 Install the bare wire on the shunt P- terminal.

Connect a wire to the P- terminal of the shunt. Torque specification: 173.5–224.8 in-lbs (19.6–25.4 N•m).

STEP-2 Install the bare wire on the device AUX BAT-.

Connect the other end of this wire to the AUX BAT- terminal of the connected device (e.g., DC-DC Battery Charger, Loads/Chargers/Inverters).

Step 6. Connect the Shunt to the Main Battery Positive

STEP-1 Install the B+ wire on the shunt B1 terminal.

Connect the positive wire to the B1 terminal of the shunt.

STEP-2 Install the B+ wire on the main battery positive.

Connect the other end of the positive wire to the positive terminal of the main battery.

Step 7. Connect the Shunt to the Starter Battery Positive (Optional)

STEP-1 Install the B+ wire on the shunt B2 terminal.

Connect the positive wire to the B2 terminal of the shunt.

STEP-2 Install the B+ wire on the starter battery positive.

Connect the other end of the positive wire to the positive terminal of the starter battery.

Step 8. Install a Battery Temperature Sensor

The temperature sensor measures the temperature of the main battery and sends the value to the DC Home app. The app can display low/high temperature alarms.

Connect the temperature sensor to the Battery Temperature Sensor Port (T1) on the shunt and place the sensor on the main battery.

Step 9. Mount the Shunt (Optional)

Mount the shunt on a wall, floor, or use a floating installation approach based on preference.

Step 10. Install the Covers

Install the Lower Cover

Re-attach the lower cover to the shunt.

Install the Upper Cover (Optional)

Re-attach the upper cover if needed. This is optional if terminals are not enclosed by the cover.

Step 11. Power On

Power on all devices in your power system. The Battery Shunt will power up automatically, indicated by the Power LED Indicator lighting up.

If the Power LED Indicator does not illuminate, inspect cables for short circuits or loose connections. For persistent issues, contact Renogy technical support via renogy.com/contact-us.

LED Indicators

Power LED Indicator

• Off: Power Off
• Solid: Power On

Bluetooth LED Indicator

• Off: No Bluetooth device connected
• Solid: Bluetooth connected

Bluetooth Pairing

Keep the phone or RENOGY ONE Core within 10 feet (3 m) for optimal performance.

Initial Pairing:

1. Open the Renogy app or RENOGY ONE Core.
2. Search and pair the Battery Shunt.

Pairing with Other Devices:

1. Remove the shunt from the DC Home app or ONE. Alternatively, press and hold RESET on the shunt for 5 seconds.
2. The Bluetooth LED turns off. Re-scan and pair the shunt with other devices.

Energy Monitoring

The shunt can establish short-range or long-range communication with monitoring devices like RENOGY ONE Core and DC Home for real-time monitoring, programming, and system management.

Download and login to the DC Home app.

Available on Google Play and App Store.

Short-Range Monitoring via DC Home App

For initial use, set the "Rated Battery Ah" (rated battery capacity) on the app.

Wireless Long-Range Monitoring

For long-range communication, connect the shunt to RENOGY ONE Core (sold separately) via Bluetooth, and RENOGY ONE Core to the DC Home app via Wi-Fi.

Recommended Components: RENOGY ONE Core (available at renogy.com).

For instructions on Renogy ONE Core, see Renogy ONE Core User Manual.

Ensure the shunt does not communicate with any other device.

Troubleshooting

Receive fault alarms on DC Home and RENOGY ONE Core for shunt faults. Login to the app or RENOGY ONE Core for details.

To access troubleshooting details, check Battery Shunt User Manual at renogy.com/support/downloads.

For technical support, contact Renogy technical service through renogy.com/contact-us.

Important Safety Instructions

General

• Wear proper protective equipment and use insulated tools. Do not wear jewelry or metal objects.
• Keep out of reach of children.
• Do not dispose of as household waste; comply with local regulations and use recycling channels.
• In case of fire, use FM-200 or CO₂ fire extinguisher.
• Do not expose to flammable or harsh chemicals or vapors.
• Clean the shunt regularly.
• Recommended cable length not exceeding 10 meters to avoid voltage drop.
• Cable specifications in the user manual account for critical, less than 3% voltage drop.
• Do not expose to strong electrostatic fields, magnetic fields, or radiation.

Shunt Safety

• Keep away from water, heat sources, sparks, and hazardous chemicals.
• Do not puncture, drop, crush, burn, penetrate, shake, strike, or step on the shunt.
• Do not open, dismantle, repair, tamper with, or modify the shunt.
• Do not touch any terminals or connectors.
• Ensure all devices are disconnected before working on the shunt.
• Do not insert foreign objects into the terminals.
• Connecting other devices to the B- terminal may affect current detection accuracy.

Renogy Support

To discuss inaccuracies or omissions, visit or contact:

• renogy.com/support/downloads
• ✉️ contentservice@renogy.com

To explore solar systems, visit Renogy Learning Center at: renogy.com/learning-center

For technical questions in the U.S., contact Renogy technical support:

• renogy.com/contact-us
• ? 1(909)2877111

For technical support outside the U.S., visit local websites:

• Canada: ca.renogy.com
• Australia: au.renogy.com
• South Korea: kr.renogy.com
• United Kingdom: uk.renogy.com
• China: www.renogy.cn
• Japan: jp.renogy.com
• Germany: de.renogy.com
• Other Europe: eu.renogy.com

Disclaimer

Renogy Battery Shunt 300 Quick Guide © 2024 Renogy. All rights reserved.

RENOGY and RENOGY are registered trademarks of Renogy.

• All information is subject to copyright and intellectual property rights of Renogy. The guide may not be modified, reproduced, or copied without prior written permission.
• Unauthorized use of registered trademarks is strictly prohibited.

FCC Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to two conditions: (1) This device may not cause harmful interference. (2) This device must accept any interference received, including interference that may cause undesired operation.

Changes or modifications not expressly approved by the responsible party could void the user's authority to operate the equipment.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment causes harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• (1) Reorient or relocate the receiving antenna.
• (2) Increase the separation between the equipment and receiver.
• (3) Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• (4) Consult the dealer or an experienced radio / TV technician for help.

FCC Radiation Exposure Statement

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.

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