Renogy Smart Shunt 300 User manual

VERSION A0
Smart Shunt 300
RENOGY
RSHST-B02P300-G1
QUICK GUIDE
B1
B2
T1

Before Getting Started
The quick guide provides important operation and maintenance instructions for Renogy Smart Shunt
300 (hereinafter referred to as shunt).
Read the quick guide carefully before operation and save it for future reference. Failure to observe the
instructions or precautions in the quick guide can result in electrical shock, serious injury, or death, or
can damage the shunt, potentially rendering it inoperable.
zRenogy ensures the accuracy, sufficiency, and the applicability of information in the quick guide
at the time of printing due to continual product improvements that may occur.
zRenogy assumes no responsibility or liability for personal and property losses, whether directly
and indirectly, caused by the user’s failure to install and use the product in compliance with the
quick guide.
zRenogy is not responsible or liable for any failure, damage, or injury resulting from repair attempts
by unqualified personnel, improper installation, or inappropriate operation.
zThe illustrations in the quick guide are for demonstration purposes only. Details may appear
slightly different depending on product revision and market region.
zRenogy reserves the right to change the information in the quick guide without notice. For the
latest quick guide, visit renogy.com.
Online Manual
Quick Guide User Manual

What’s In the Box?.............................................................................................................................................................1
Dimensions ........................................................................................................................................................................1
Get to Know Renogy Smart Shunt 300.......................................................................................................................... 2
Renogy Smart Shunt 300 System Setup ...................................................................................................................... 3
Required Tools & Accessories ........................................................................................................................................ 4
How to Size Bare Wires? .................................................................................................................................................. 5
Check System Voltage and Current .............................................................................................................................. 5
Step 1. Plan a Mounting Site ........................................................................................................................................... 6
Step 2. Wear Insulating Gloves....................................................................................................................................... 6
Step 3. Remove the Covers............................................................................................................................................. 7
Step 4. Connect the Shunt to the Main Battery Negative .......................................................................................... 8
Step 5. Connect the Shunt to the Device BAT- ............................................................................................................ 9
Step 6. Connect the Shunt to the Main Battery Positive.......................................................................................... 10
Step 7. Connect the Shunt to the Starter Battery Positive (Optional) ....................................................................11
Step 8. Install a Battery Temperature Sensor............................................................................................................ 12
Step 9. Mount the Shunt (Optional) ............................................................................................................................. 12
Step 10. Install the Covers............................................................................................................................................ 13
Step 11. Power On........................................................................................................................................................... 14
LED Indicators................................................................................................................................................................ 14
Bluetooth Pairing........................................................................................................................................................... 15
Energy Monitoring ......................................................................................................................................................... 16
Troubleshooting............................................................................................................................................................. 19
Important Safety Instructions ....................................................................................................................................20
Table of Contents

— 1 —
What’s In the Box?
Renogy Smart Shunt 300 × 1
Quick Guide × 1
B1/B2 Wires (1 m) (22 AWG) × 2 Temperature Sensor (1.5 m) × 1
VERSION A0
Smart Shunt 300
RENOGY
RSHST-B02P300-G1
QUICK GUIDE
Mounting Screws x 3
(1 extra)
ST4 x 18 mm
3/8 in
(M10)
B1
B2
T1
B1
B2
T1
Make sure that all accessories are complete and free of any signs of damage.
Dimensions
5.27 in (134 mm)
3.82 in
(97 mm)
1.22 in (31 mm)
0.87 in (22 mm)
B1
B2
T1
Dimension tolerance: ±0.2 in (0.5 mm)

— 2 —
Get to Know Renogy Smart Shunt 300
█Exterior
Upper Cover
Lower Cover
Mounting Hole Mounting Hole
Power LED Indicator
Bluetooth LED Indicator
RESET Button
B1
B2
T1
█Interior (with the covers removed)
B- Terminal (M10)
B1 and B2 Terminals
Battery Temperature
Sensor (T1) Port
P- Terminal (M10)

— 3 —
Renogy Smart Shunt 300 System Setup
Main Battery
Positive
+ - - +
Temperature
B-
B1
P- Negative
Starter Battery (optional)
Loads / Chargers / Inverters
BAT-BAT+
DC-DC Battery Charger
-
+
B2
T1
You can connect the Smart Shunt 300 to a starter battery via the B2 port on demand.

— 4 —
Required Tools & Accessories
Insulating Gloves
Bare Wires × 2
Wrench
(11/16 in)
17 mm
17 mm
17 mm
Phillips
Screwdriver (#1) Wire stripper
Slotted
Screwdriver (1 mm)
Manual Hydraulic
Pliers
3/8 in Lugs
(M10 Ring Terminals) × 2
Heat Gun Heat Shrink Tubing
Prior to installing and configuring the shunt, prepare the recommended tools, components, and
accessories.
For how to size bare wires, refer to “How to Size Bare Wires?” in this manual.
For the connection methods and required tools for the main battery, starter battery, and
equipment terminal, please refer to the corresponding device user manual. The diagrams
provided within this manual are for illustrative purposes only.
For how to use Wire stripper, Heat Shrink Tubing, Manual Hydraulic Pliers, and Heat Gun to install
3/8 in Lugs (M10 Ring Terminals), visit renogy.com/support/downloads to check Smart Shunt
User Manual.

— 5 —
How to Size Bare Wires?
Select proper bare wires based on the ampacity in your power system. Refer to the table below for
copper cable ampacities with different gauge sizes.
Cable Gauge Size Ampacity Cable Gauge Size Ampacity
14 AWG (2.08 mm²) 35A 2 AWG (33.6 mm²) 190A
12 AWG (3.31 mm²) 40A 1 AWG (42.4 mm²) 220A
10 AWG (5.25 mm²) 55A 1/0 AWG (53.5 mm²) 260A
8 AWG (8.36 mm²) 80A 2/0 AWG (67.4 mm²) 300A
6 AWG (13.3 mm²) 105A 4/0 AWG (107 mm²) 405A
4 AWG (21.1 mm²) 140A
The above values are from the NEC Table 310.17 for copper cables rated at 194°F (90°C),
operating at an ambient temperature of no more than 86°F (30°C). Cables longer than 13 feet
(4000 mm) may require thicker gauge wires to prevent excessive voltage drop in undersized
wiring.
Check System Voltage and Current
Ensure the smart shunt operates within a power system with a maximum system voltage of 120V and a
continuous current of up to 300A. Exceeding these voltage and current limits may cause damage to the
shunt.
Risk of electric shock! Before installing the shunt, please turn off all devices within the system
and ensure there is no current flowing through the circuit.

— 6 —
Step 1. Plan a Mounting Site
Select a proper mounting site to ensure the shunt can be safely connected to the battery and other
necessary devices with the relevant cables. Install the shunt in a clean, cool, and dry location, free from
any accumulation of water, oil, or dirt. For optimal Bluetooth communication, avoid placing the smart
shunt near metal objects.
KEEP DRY FRAGILE VENTILATION
14°F to 122°F
-10°C to 50°C 0% to 95%
Enclosed space
Vent
Vent
Air
cross-flow
B1
B2
T1
Step 2. Wear Insulating Gloves
Insulating Gloves
B1
B2
T1

— 7 —
Step 3. Remove the Covers
█Remove the Upper Cover
B1
B2
T1
B1
B2
T1
█Remove the Lower Cover
B1
B2
T1
B1
B2
T1

— 8 —
Step 4. Connect the Shunt to the Main Battery Negative
173.5—224.8 in·lbs
(19.6—25.4 N·m)
-
-
+
Main Battery
STEP-1 Install the bare wire on the shunt B- terminal.
STEP-2 Install the bare wire on the battery negative.
Renogy Smart Shunt 300
Bare Wire
1 2
-
B-
B-
You can connect a main battery to the B- terminal because connecting other devices to this
terminal may affect the shunt’s accuracy in current detection.
For how to connect batteries in series or parallel to the smart shunt, refer to the Smart Shunt
User Manual by scanning the QR code in the preface of the guide or at www.renogy.com/
support/downloads.

— 9 —
Step 5. Connect the Shunt to the Device BAT-
DC-DC Battery Charger
Loads & Charges & Inverters
BAT-
BAT-
DC-DC Battery Charger
STEP-1 Install the bare wire on the shunt P- terminal.
STEP-2 Install the bare wire on the device BAT-.
Renogy Smart Shunt 300
Bare Wire
12
P- P-
173.5—224.8 in·lbs
(19.6—25.4 N·m)

— 10 —
Step 6. Connect the Shunt to the Main Battery Positive
+
+
-
+
Main Battery
STEP-1 Install the B+ wire on the shunt B1 terminal.
STEP-2 Install the B+ wire on the main battery positive.
Renogy Smart Shunt 300
B1 Wire
1 2
Open Close
B1

— 11 —
Step 7. Connect the Shunt to the Starter Battery Positive (Optional)
+
+
Starter Battery
STEP-1 Install the B+ wire on the shunt B2 terminal.
STEP-2 Install the B+ wire on the starter battery positive.
Renogy Smart Shunt 300
B2 Wire
12
Open Close
B2

— 12 —
Step 8. Install a Battery Temperature Sensor
The temperature sensor measures the temperature of the main battery and sends the temperature
value to the DC Home app. The app displays a low/high temperature alarm when the battery
temperature reaches a preset limit.
Temperature Sensor
Battery Temperature
Sensor Port
Step 9. Mount the Shunt (Optional)
You have the flexibility to select a suitable mounting method based on your preference. You can opt to
mount it on a wall, the floor, or even use a floating installation approach.

— 13 —
Step 10. Install the Covers
█Install the Lower Cover
B1
B2
T1
B1
B2
T1
█Install the Upper Cover (Optional)
B1
B2
T1
Installing the Upper Cover is optional in cases where the terminals are not enclosed by the
cover.

— 14 —
Step 11. Power On
Power on all devices in your power system, and the Smart Shunt is powered up automatically with the
Power LED Indicator lighting up.
If the Power LED Indicator fails to illuminate, please inspect the cables for any signs of short
circuits or loose connections. If the issue persists, please reach out to our technical support
team via renogy.com/contact-us.
LED Indicators
Power LED Indicator
O: Power O
Solid: Power On
Bluetooth LED Indicator
O:
No Bluetooth device connected
Solid:
Bluetooth connected

— 15 —
Bluetooth Pairing
To ensure optimal system performance, keep the phone or RENOGY ONE Core within 10 feet (3 m)
of the shunt.
█Initial Pairing:
1 2
1. Open the app or RENOGY ONE Core.
2. Search and pair the Smart Shunt.
█Pairing with Other Devices:
5s
1 2
1. Remove the shunt from the DC Home app
or ONE. Alternatively, you can press and hold
RESET on the shunt for 5s.
2. The Bluetooth LED turns o. Re-scan
and pair the shunt with other devices.

— 16 —
Energy Monitoring
Depending on the specific application, the shunt can establish either short-range or long-range
communication connections with monitoring devices. These monitoring devices including RENOGY ONE
Core and DC Home facilitate real-time monitoring, programming, and complete system management,
offering comprehensive control and enhanced flexibility.
The version of the DC Home app might have been updated. Illustrations in the user manual are
for reference only. Follow the instructions based on the current app version.
Download and login to the DC Home app.
DC Home App
█Short-Range Monitoring via DC Home App
For initial use, set the “Rated Battery Ah” (rated battery capacity) on the app prior to other operations.
2 3 4
1

— 17 —
On after
successful
pairing
B1
B2
T1
█Wireless Long-Range Monitoring
If long-range communication and programming are required, connect the shunt to RENOGY ONE Core
(sold separately) through Bluetooth, and the RENOGY ONE Core to the DC Home app through Wi-Fi.
Recommended Components
*RENOGY ONE Core
Components marked with “*” are available on renogy.com.
For instructions on Renogy ONE Core, see Renogy ONE Core User Manual.
Make sure the shunt does not communicate with any other device.