Renogy RBC2125DS-21W User manual

USER MANUAL
VERSION A0
January 5, 2024
Dual Input DC-DC On-Board with MPPT Battery Charger
Renogy
RBC2125DS-21W
12V/24V 50A IP67

Before Getting Started
The user manual provides important operation and maintenance instructions for Renogy 12V/24V 50A
IP67 Dual Input DC-DC On-Board with MPPT Battery Charger (hereinafter referred to as battery charger).
Read the user manual carefully before operation and save it for future reference. Failure to observe the
instructions or precautions in the user manual can result in electrical shock, serious injury, or death, or
can damage the battery charger, potentially rendering it inoperable.
zRenogy ensures the accuracy, sufficiency, and the applicability of information in the user manual
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 user
manual.
zRenogy is not responsible or liable for failures, damages, or injuries resulting from repair attempted
by unqualified personnel, improper installation, and unsuitable operation.
zThe illustrations in the user manual 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 user manual without notice. For the
latest user manual, visit renogy.com.
Disclaimer
Renogy 12V/24V 50A IP67 Dual Input DC-DC On-Board with MPPT Battery Charger User Manual © 2024
Renogy. All rights reserved.
RENOGY and are registered trademarks of Renogy.
zAll information in the user manual is subject to copyright and other intellectual property rights of
Renogy and its licensors. The user manual may not be modified, reproduced, or copied, in whole or
in part, without the prior written permissions of Renogy and its licensors.
zThe registered trademarks in the user manual are the property of Renogy. The unauthorized use of
the trademarks is strictly prohibited.
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1. General Information ........................................................................................................................... 1
1.1. Symbols Used .............................................................................................................................................. 1
1.2. Introduction ................................................................................................................................................. 1
1.3. Key Features ................................................................................................................................................ 1
1.4. SKU................................................................................................................................................................. 1
2. Get to Know 12V/24V 50A DC-DC Battery Charger with MPPT .....................................................2
2.1. What’s In the Box?...................................................................................................................................... 2
2.2. Product Overview....................................................................................................................................... 2
2.3. System Setup ............................................................................................................................................. 3
3. Preparation .........................................................................................................................................4
3.1. Recommended Tools & Accessories ...................................................................................................... 4
3.2. Size Wires..................................................................................................................................................... 5
3.3. Plan a Mounting Site ................................................................................................................................. 5
3.4. Check the Battery Charger ...................................................................................................................... 6
3.5. Check the Auxiliary Battery ......................................................................................................................7
3.6. Check the Solar Panel(s)........................................................................................................................... 8
3.7. Check the Alternator on Your Automobile ...........................................................................................10
3.8. How to Install 15/32 in Lugs or 3/8 in Lugs?....................................................................................... 11
3.9. How to Install Cables on the Battery Charger?...................................................................................12
4. Installation ........................................................................................................................................ 15
4.1. Wear Insulating Gloves.............................................................................................................................15
4.2. Connect the Battery Charger to a Busbar ...........................................................................................15
4.3. Connect the Battery Charger to an Auxiliary Battery .......................................................................16
4.4. Connect the Battery Charger to a Solar Panel....................................................................................17
4.5. Connect the Battery Charger to a Starter Battery.............................................................................18
4.6. Install a Battery Temperature Sensor...................................................................................................19
4.7. CAN Communication Wiring (Optional).................................................................................................19
4.8. Wire Inspection......................................................................................................................................... 23
5. LED Indicators...................................................................................................................................24
6. Configuration....................................................................................................................................25
6.1. Set a Battery Type.................................................................................................................................... 25
6.2. User Mode.................................................................................................................................................. 25
6.3. Configure Charging Parameters........................................................................................................... 26
6.4. Activate Lithium Batteries..................................................................................................................... 27
7. Monitoring .........................................................................................................................................28
7.1. Short-Range Monitoring.........................................................................................................................28
7.2. Wireless Long-Range Monitoring ......................................................................................................... 29
7.3. Wired Long-Range Monitoring (Backbone Network)........................................................................30
7.4. Wired Long-Range Monitoring (Daisy Chain Network)......................................................................31
Table of Contents

8. Working & Charging Logic................................................................................................................32
8.1. Automatic Voltage Matching Function................................................................................................32
8.2. Charging Logic..........................................................................................................................................33
8.3. Battery Charging Stages........................................................................................................................ 35
9. Troubleshooting................................................................................................................................37
10. Dimensions & Specifications...........................................................................................................39
10.1. Dimensions................................................................................................................................................39
10.2. Technical Specifications......................................................................................................................... 39
11. Maintenance..................................................................................................................................... 40
11.1. Inspection.................................................................................................................................................40
11.2. Cleaning .....................................................................................................................................................40
11.3. Storage.......................................................................................................................................................40
12. Emergency Responses..................................................................................................................... 41
12.1. Fire ...............................................................................................................................................................41
12.2. Flooding ......................................................................................................................................................41
12.3. Smell ............................................................................................................................................................41
12.4. Noise............................................................................................................................................................41
Renogy Support ........................................................................................................................................42

— 1 —
1. General Information
1.1. Symbols Used
The following symbols are used throughout the user manual to highlight important information.
WARNING: Indicates a potentially hazardous condition that could result in personal injury or
death.
CAUTION: Indicates a critical procedure for safe and proper installation and operation.
NOTE: Indicates an important step or tip for optimal performance.
1.2. Introduction
Renogy 12V/24V 50A IP67 Dual Input DC-DC On-Board with MPPT Battery Charger allows you to
charge your house (auxiliary) battery from solar panels or the starter battery in your RV. It is a charging
device that not only converts direct current to the appropriate voltage for charging a battery but also
incorporates MPPT (Maximum Power Point Tracking) technology to optimize power conversion from
solar panels.
The battery charger is versatile and can be connected to either 12V or 24V auxiliary batteries. The built-
in buck converter module is designed to adapt to different voltage requirements, enabling 12V solar
panels to charge 24V batteries at their native voltage and 24V solar panels to charge 12V batteries at
their native voltage.
Thanks to the exclusive intelligent charging logic, the battery charger prioritizes solar energy and
automatically adjusts working modes based on sunlight intensity, efficiently charging your house
battery while easing the load on generators. The battery charger seamlessly switches to solar
charging in ample sunlight and smoothly transitions to generator charging during low light, ensuring
uninterrupted device power.
Equipped with intelligent boost and buck logic, it seamlessly accommodates 12V/24V voltage systems,
elevating DIY possibilities to the uttermost. Maximizing energy utilization, it boasts a robust 50A current
and an impressive 720W output power, making a slim, waterproof dual charging solution perfect for
confined spaces. You can embrace an eco-conscious charging experience without compromising
efficiency or space, redefining sustainable energy utilization with the battery charger.
1.3. Key Features
zIntelligent Boost and Buck Logic
Effortlessly converts between 12V and 24V systems with over 90% efficiency for boosting and 94%
for voltage reduction, offering a dual charging solution adaptable to various DIY configurations.
zPrioritize Solar Green Energy
Features auto-switching charging mode while prioritizing green power, achieving 97% charging
efficiency, and delivering 720W high charging power for a greener approach.
zIP67 Waterproof
Ensures robust safety standards with multiple certifications like CE, FCC,and RoHS, guaranteeing a
secure off-grid power experience alongside strong IP67 waterproof performance.
zExtremely Compact and Lightweight
Compact and light enough to be mounted in engine compartment and side storeroom, allowing for a
more spacious and comfortable living space.
zSmart Living Unleashed
Compatible with both built-in Bluetooth and wired CAN communication to get real-time data, striving
for the most reliable experience for off-grid users.
1.4. SKU
Renogy 12V/24V 50A IP67 Dual Input DC-DC On-Board
with MPPT Battery Charger RBC2125DS-21W

— 2 —
2. Get to Know 12V/24V 50A DC-DC Battery Charger with MPPT
2.1. What’s In the Box?
VERSION A0
January 5, 2024
Dual Input DC-DC On-Board with MPPT Battery Charger
Renogy
12V/24V 50A IP67
RBC2125DS-21W
QUICK GUIDE
Renogy 12V/24V 50A IP67
Dual Input DC-DC On-Board
with MPPT Battery Charger × 1
Quick Guide × 1
15/32 in Lugs
(M12 Ring Terminals) × 4
Battery Temperature
Sensor (3 m) × 1
Mounting Screws x 4
ST4*20 mm
Make sure that all accessories are complete and free of any signs of damage.
The accessories and product manual listed are crucial for the installation, excluding warranty
information and any additional items. Please note that the package contents may vary depending
on the specific product model.
The 15/32-inch lugs (M12 ring terminals) are used to connect starter battery on your vehicle to
your auxiliary battery.
2.2. Product Overview
█Right-side View
Battery Type
Setting Button
Battery Type Indicator
Auxiliary Battery Indicator
Alternator Charging Indicator
Solar Charging Indicator
Bluetooth Antenna

— 3 —
█Left-side View
Mounting Holes
CAN Communication Ports
Battery Temperature
Sensor Cable
(with connectors)
Positive Starter
Battery Cable (red)
Negative Common
Cable (black)
Positive Solar
Cable (yellow)
Positive Auxiliary
Battery Cable (brown)
2.3. System Setup
RV-C or Renogy devices supporting CAN communication
Solar Panel (s)
Auxiliary Battery
(12V / 24V)
Starter Battery
DC-DC Battery Charger
+
-
+
-
+
-
Communication
Temperature
Negative
Positive
The wiring diagram only shows the key components in a typical DC-coupled off-grid energy
storage system for the illustrative purpose. The wiring might be different depending on the
system configuration. Additional safety devices, including disconnect switches, emergency
stops, and rapid shutdown devices, might be required. Wire the system in accordance with the
regulations at the installation site.
The battery charger can be connected separately to the solar panel for charging the auxiliary
battery or to the vehicle’s starting battery for charging the auxiliary battery.

— 4 —
3. Preparation
3.1. Recommended Tools & Accessories
Measuring TapeInsulation Tape
3
4
5
6
Insulating Gloves
Phillips
Screwdriver (#1) Wire stripper
Manual Hydraulic Pliers
Heat Gun
Heat Shrink Tubing
Butt-Splices
3/8 in Lugs (M10 Ring Terminals) Busbar (60A to 100A)
Bare Wires
Prior to installing and configuring the battery charger, prepare the recommended tools,
components, and accessories.
Choose proper mounting screws specific to your installation site. This manual takes self-tapping
screws for wooden walls as an example.
The 3/8-inch lugs (M10 ring terminals) are used to connect the busbar and ANL fuse.
For how to size bare wires, refer to “3.2. Size Wires” in this manual.
In this manual, the red cable represents the positive cable, and the gray cable represents the
negative cable.
Do not use the bare wire if there is any visible damage.

— 5 —
3.2. Size Wires
Select proper bare wires based on the cable length in your power system. Refer to the table below for
recommended gauge sizes.
Cable Cable Length Cable Gauge Size
Output
(to Auxiliary Battery)
0 ft to 10 ft (0 m to 3 m) 10 AWG (5.25 mm²)
11 ft to 20 ft (3 m to 6 m) 8 AWG (8.36 mm²)
21 ft to 30 ft (6 m to 9 m) 6 AWG (13.3 mm²)
Input
(from Starter Battery)
0 ft to 10 ft (0 m to 3 m) 10 AWG (5.25 mm²)
11 ft to 20 ft (3 m to 6 m) 8 AWG (8.36 mm²)
21 ft to 30 ft (6 m to 9 m) 6 AWG (13.3 mm²)
Input
(from Solar Panel)
0 ft to 10 ft (0 m to 3 m) 12 AWG (3.31 mm²)
11 ft to 20 ft (3 m to 6 m) 10 AWG (5.25 mm²)
21 ft to 30 ft (6 m to 9 m) 10 AWG (5.25 mm²)
The cable specifications listed above account for critical, less than 3% voltage drop and may not
account for all configurations.
The specification of fuse cable is consistent with the input or output terminal of the battery
charger.
3.3. Plan a Mounting Site
The battery charger requires adequate clearance for installation, wiring and ventilation. The minimum
clearance is provided below. Ventilation is highly recommended if it is mounted in an enclosure. Select
a proper mounting site to ensure the battery charger can be safely connected to the battery, solar
panel(s), and the other necessary devices with the relevant cables.
You can mounting the battery charger vertically on a wall or horizontally on the floor.
5.91 in
(150 mm)
5.91 in
(150 mm)
5.91 in
(150 mm)
FRAGILE VENTILATION
0% to 95%
-31°F to 176°F
-35°C to 80°C
SolarVehicle Stage Battery
5.91 in
(150 mm)
Solar Vehicle Stage Battery
Risk of explosion! Never install the battery charger in a sealed enclosure with flooded batteries!
Do not install the battery charger in a confined area where battery gases can accumulate.
The battery charger should be installed on a flat surface protected from direct sunlight.
Keep the battery charger out of the reach of children and animals.

— 6 —
Do not expose the battery charger to flammable or harsh chemicals or vapors.
Make sure that the battery charger is installed in a place at ambient temperature from -31°F to
176°F (-35°C to 80°C).
Make sure that the battery charger is installed in an environment with relative humidity between
0% and 95% and no condensation.
If the battery charger is installed improperly on a boat, it may cause damage to components of
the boat. Have the battery charger by a qualified electrician.
The battery charger should be as close to the battery as possible to avoid voltage drop due to
long cables.
It is recommended that all cables (except communication cables) should not exceed 10 meters
(32.8 feet) because excessively long cables result in a voltage drop. The communication cables
should be shorter than 6 m (19.6 feet).
The cable specifications listed in the user manual account for critical, less than 3% voltage drop
and may not account for all configurations.
Keep the battery charger away from EMI receptors such as TVs, radios, and other audio/visual
electronics to prevent damage or interference to the equipment.
3.4.Check the Battery Charger
Inspect the battery charger for any visible damage including cracks,
dents, deformation, and other visible abnormalities. All connector
contacts shall be clean, free of dirt and corrosion, and dry.
Do not use the battery charger if there is any visible damage.
Do not puncture, drop, crush, penetrate, shake, strike, or step on the battery charger.
There are no serviceable parts in the battery charger. Do not open, dismantle, repair, tamper with,
or modify the battery charger.

damage to the battery charger and other connected devices, thus voiding the warranty.
Do not touch the connector contacts while the battery charger is in operation.
Wear proper protective equipment and use insulated tools during installation and operation. Do
not wear jewelry or other metal objects when working on or around the battery charger.
Do not dispose of the battery charger as household waste. Comply with local, state, and federal
laws and regulations and use recycling channels as required.

— 7 —
3.5. Check the Auxiliary Battery
Recommended Components & Accessories
*12V/24V Battery (11V to 32V) *ANL Fuse (60A) × 1
+
-
Components and accessories marked with “*” are available on renogy.com.
+
-
1. Inspect the battery for any visible damage including cracks,
dents, deformation, and other visible abnormalities. All terminals
shall be clean, free of dirt and corrosion, and dry.
The battery charger can only be connected to 12V or 24V deep-
cycle gel-sealed lead-acid batteries (GEL), flooded lead-acid
batteries (FLD), sealed lead-acid batteries (SLD/AGM) or lithium
iron phosphate batteries (LI).
Do not use the battery if there is any visible damage. Do not touch the exposed electrolyte or
powder if the battery housing is damaged.
When being charged, the battery may give off explosive gas. Make sure there is good ventilation.
Take care to use a high-capacity lead-acid battery. Be sure to wear protective goggles. If

Combine batteries in parallel or in series as needed. Prior to installing the battery charger, ensure
all battery groups are installed properly.
Read the user manual of the battery in use carefully.
Battery or Battery Bank System Voltage
Battery or Battery Bank System Voltage = System Voltage U
Batteries in Series Batteries in Parallel
System Voltage U: U+U+USystem Voltage U: U=U=U
2. This battery charger works
seamlessly with both 12V and
24V battery systems. Please
consult the battery manual
for accurate system voltage
information. Ensure that the
16V overvoltage protection is
not triggered for 12V systems
and the 32V protection is not
activated for 24V systems.
Read the battery user manual for battery voltage parameters, and calculate the voltage of the battery or
battery pack system according to the formula to ensure that it does not exceed 32V.
In the formula, U represents the battery voltage, and 1, 2, or 3 represents the battery number
respectively.

— 8 —
3. Inspect the ANL Fuses for any visible damage including cracks,
dents, deformation, and other visible abnormalities. All terminals
shall be clean, free of dirt and corrosion, and dry.
Do not use the ANL Fuses if there is any visible damage.
For details on how to install and use the ANL Fuse, see its user manual.
3.6. Check the Solar Panel(s)
Recommended Components & Accessories
*Solar Panel Extension Cables × 2
*Solar Panel (s) *Solar Panel Fuse
Components and accessories marked with “*” are available on renogy.com.
For how to size solar panel extension cables, refer to “3.2. Size Wires” in this manual.
1. Inspect the solar panel for any visible damage including cracks,
dents, deformation, and other visible abnormalities. All connector
contacts shall be clean, dry, and free of dirt and corrosion.
Do not use the solar panel if there is any visible damage.
Cover the solar panel prior to connecting it to the battery charger to prevent any electrical current
or voltage from being generated or flowing through the system during the installation process.
This reduces the risk of electrical shocks or accidents while making connections, ensuring the
safety of the installer and the integrity of the equipment.
Do not install the solar panel on a surface constructed from combustible material.
Do not expose the solar panel to direct flame or heat sources.
Keep the solar panel out of the reach of children.
Keep the solar panel away from explosives and corrosive substances.

— 9 —
Do not step, walk, stand, or jump on the solar panel. Localized heavy loads may cause damage to
the solar cells, which will ultimately compromise the performance of the solar panel.
Do not bend the solar panel. Bending the solar panel will cause damage to the cells and affect
panel performance.
Do not immerse the solar panel in water.
Read the user manual of the solar panel carefully before installation.
The solar panels can be combined in parallel or in series as needed.
Identify the polarities (positive and negative) on the cables used for solar panels. A reverse
polarity contact may damage the unit.
Maximum Output Power
Maximum Output Power of Solar Panel or Solar Panel Array
= Maximum Solar Input Power W
Solar Panels in Series Solar Panels in Parallel
Maximum Output Power W:
W+W+W
Maximum Output Power W:
W+W+W
2. Read the user manual of the
solar panel for the maximum
output power, and calculate
the maximum output power of
solar panel or solar panel array
according to the formula. Ensure
that the maximum output power
of the solar panel/solar panel
array does not exceed 720W.
In the formula, W represents the output power of the solar panel, and 1, 2, or 3 represents the
solar panel number respectively.
Open Circuit Voltage
Open Circuit Voltage of Solar Panel or Solar Panel Array
= Open Circuit Voltage U
Solar Panels in Series Solar Panels in Parallel
Working Voltage U: U+U+UWorking Voltage U: U=U=U
3. Read the user manual of the
solar panel for the maximum
open circuit voltage, and
calculate the maximum open
circuit voltage of solar panel or
solar panel array according to
the formula. Ensure that the
open circuit voltage of the solar
panel/solar panel array does not
exceed 50V.
In the formula, 1, 2, or 3 represents the solar panel number respectively.
Short Circuit Current (Isc)
Short Circuit Current (Isc)
of Solar Panel or Solar Panel Array
= Short Circuit Current (Isc) I
Solar Panels in Series Solar Panels in Parallel
Short Circuit Current (Isc) I:
I=I=I
Short Circuit Current (Isc) I:
I+I+I
4. Read the user manual of the
solar panel for the short circuit
current (Isc), and calculate the
short circuit current (Isc) of
solar panel or solar panel array
according to the formula.
In the formula, I represents the short circuit current (Isc) of the solar panel, and 1, 2, or 3
represents the solar panel number respectively.
Short circuit current is the abnormal flow of electric current in a power system, occurring
between phases or between phase and ground (or neutral) during operation, with values often
exceeding the rated current and dependent on the electrical distance from the short-circuit point
to the power source. For detailed information, please refer to the specific solar panel manual.

— 10 —
5. The appropriate current rating for the solar panel fuse should be
determined by multiplying the total short current amperage of
the solar panel array by 1.56.
Rated Current of the Solar Panel Fuse = Short Circuit Current (Isc)
of Solar Panel x 1.56
Inspect the solar panel fuse for any visible damage including
cracks, dents, deformation, and other visible abnormalities. All
terminals shall be clean, free of dirt and corrosion, and dry.
Do not use the solar panel fuse if there is any visible damage.
For details on how to install and use the solar panel fuse, see its user manual.
6. Inspect the Solar Panel Extension Cables for any visible
damage including cracks, dents, deformation, and other visible
abnormalities. All connector contacts shall be clean, dry, and free
of dirt and corrosion.
Do not use the solar panel extension cables if there is any visible damage.
3.7. Check the Alternator on Your Automobile
Recommended Components
*ANL Fuse (70A) × 1
Accessories marked with “*” are available on renogy.com.
The automobile alternator may be a smart alternator or a traditional alternator. The connection method
of a smart alternator or a traditional alternator depends on its parameters. Before installing the battery
charger, read the user manual of the vehicle or consult the vehicle supplier to determine the type of
alternator.
In addition, you can use a multimeter by yourself to measure the alternator to determine the type of
alternator.
1. Locate your main vehicle battery or the starter battery.
2. Start the engine. Ensure all any fans, radio, lights, and others are turned off.
3. Take a voltage reading across the main vehicle battery.
4. Leave the engine run for around 5 or 10 minutes, then repeat Step 3.
Taking a 12V system as an example, if the vehicle’s starter battery is 24V, the following parameters
should be multiplied by 2.
Readings around 14.4V DC indicates you most likely have a traditional alternator. If your readings are
around 12.5-13.5V, you most likely have a smart alternator.

— 11 —
In general, the working voltage of a traditional alternator ranges from 13.2V to 16V, and that of a
smart alternator ranges from 12V to 16V. Consult the vehicle supplier for help if necessary.
3.8.How to Install 15/32 in Lugs or 3/8 in Lugs?
0.4 in
(10 mm)
Step 1: Strip approximately 0.4 inches (10 mm) of insulation from
the end of a bare wire using a wire stripper.
Heat
Shrink
Tubing
Step 2: Thread the exposed bare wire through a piece of heat shrink
tubing.
Step 3: Attach a 15/32-inch lug or 3/8-inch lug onto the end of the
bare wire.
Step 4: Securely crimp the lug
onto the bare wire using a manual
hydraulic pliers.

— 12 —
Step 5: Slide the heat shrink tubing over the 15/32-inch lug or 3/8-
inch lug.
Step 6: Apply heat to the heat shrink
tubing using a heat gun until it
shrinks and forms a tight seal.
3.9. How to Install Cables on the Battery Charger?
You are allowed to make connections using insulated conduit, junction boxes, or welding
methods. If the battery charger is installed outdoors, please ensure that the wiring connections
are waterproof.
█Positive Cable
The illustrations are based on the Positive Auxiliary Battery Cable. The butt-splice connectors we use in
the manual come in separate butt-splices and heat shrink tubings.
Battery
Charger
Step 1: Wear insulating gloves before wiring. Remove some
insulation from the end of the Positive Auxiliary Battery Cable based
on the length of the but-splice with a wire stripper.
Bare
Wires
Step 2: Remove some insulation from one end of a bare wire based
on the length of the but-splice with a wire stripper.

— 13 —
Heat
Shrink
Tubing
Step 3: Thread the exposed bare wire through a piece of heat shrink
tubing.
Step 4: Insert the Positive Auxiliary Battery Cable and bare wire into
the butt-splices.
Step 5: Securely crimp the butt-splices onto the cables using a
manual hydraulic pliers.
You can solder the wires to the butt-splice, ensure that a good connection is made.
Step 6: Slide the heat shrink tubing over the butt-splices.

— 14 —
Step 7: Apply heat to the heat shrink
tubing using a heat gun until it
shrinks and forms a tight seal.
█Negative Cable
For the negative terminals, we recommend a busbar. Install the 3/8-inch lugs (M10 ring terminals) on
the solar panel, auxiliary battery, starter battery negative cables, and battery charger negative common
cable (black) on the busbar.
Busbar
(60A to 100A)
Solar Panel (s)
Auxiliary Battery
(12V / 24V)
Starter Battery
+
-
+
-
+
-
15/32 in Lug
(M12 Ring
Terminal)
15/32 in Lug
(M12 Ring
Terminal)
3/8 in Lug
(M10 Ring
Terminal)

— 15 —
4. Installation
To ensure safe and efficient operation of the battery charger and to avoid potential damage or hazards,
always follow the installation instructions in the sequence described in this manual.
4.1. Wear Insulating Gloves
Insulating Gloves
4.2.Connect the Battery Charger to a Busbar
Busbar
(60A to 100A)
3/8 in Lug
(M10 Ring Terminal)
Negative Common Cable (black)
Tug on cable to ensure firm connection.

— 16 —
4.3.Connect the Battery Charger to an Auxiliary Battery
The battery charger can only be connected to 12V or 24V deep-cycle gel-sealed lead-acid batteries
(GEL), flooded lead-acid batteries (FLD), sealed lead-acid batteries (SLD/AGM) or lithium iron phosphate
batteries (LI).
Step 1: Connect one positive cable (red) to the Positive Auxiliary Battery Cable (brown) on the battery
charger.
Step 2: Connect the other end of the positive cable (red) to an ANL fuse.
Step 3: Connect the negative cable (gray) to the Busbar, connect the other end to the negative end of
an auxiliary battery.
Step 4: Connect the ANL fuse to the positive end of the auxiliary battery through the other positive
cable (red).
ANL Fuse (60A)
3/8 in Lug
3/8 in Lug
15/32 in Lug
-
+
12
12
Auxiliary Battery
++
-
STEP-1 Install cables on the battery charger
STEP-2 Install an ANL fuse
STEP-3 Install the cables on the battery
1 2
Positive Auxiliary
Battery Cable (brown)
of the Battery Charger
Positive Cable
(red bare wire)
-
Tug on all cables to ensure firm connection.
Always connect the battery charger to a battery before connecting it to a solar panel to ensure
safe and efficient operation.