Renogy DC-DC Battery Charger

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.

ℹ️ NOTE: Indicates an important step or tip for optimal performance.

1.2. Introduction

Renogy 12V 20A/40A DC-DC Battery Charger allows you to charge your 12V auxiliary battery from the starter battery in your RV. The supported auxiliary battery types include 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). In addition, the battery charger provides a user-defined battery mode that allows for more battery setting flexibility.

This second-generation charger delivers an unparalleled driving charge experience, enhanced by smart control technology. Compatible with both smart and traditional generators, it maximizes energy efficiency while protecting your vehicle's batteries. With advanced electronic protections and up to 94% charging efficiency, this charger ensures reliable performance on the road. The intelligent charging logic optimizes the charging process, and with remote monitoring via the Renogy app (free of charge) or Renogy ONE Core (sold separately), you can effortlessly monitor your battery system's status.

1.3. Key Features

• Advanced High-Temperature Performance Effortlessly converts between 12V systems with over 90% efficiency for boosting and 94% for voltage reduction, offering a dual charging solution adaptable to various DIY configurations.
• Alternator Running Detection Features an advanced alternator running detection system, which effectively monitors the alternator's status to prevent overdischarge of the starter battery. This ensures that the starter battery remains adequately charged and ready for vehicle ignition.
• Optimized Battery Health Enables or disables lithium battery activation based on battery status via the Renogy app, extending battery lifespan.
• Extremely 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.
• Smart Control for Simplicity and Efficiency The included BT-2 Bluetooth module allows for seamless remote monitoring of the battery charger through the Renogy app on your smartphone, providing real-time insights into the charging process and enabling you to track performance over time and make informed decisions for optimal battery management.

1.4. SKU

2.1. What's In the Box?

The following items are included in the package:

• Renogy 12V 20A/40A DC-DC Battery Charger x 1
• Quick Guide x 1
• Battery Temperature Sensor (2 m) x 1
• IGN Signal Wire (3 m) x 1
• ST4*16 mm Mounting Screws x 4

ℹ️ Make sure that all accessories are complete and free of any signs of damage.

ℹ️ 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.

2.2. Product Overview

Diagram: Product overview showing input and output sides with labeled components.

Output Side:

• Battery Type Indicator
• Fault Status Indicator
• Battery Status Indicator
• Battery Type Setting Button
• Positive Output Terminal
• Negative Output Terminal
• Mounting Hole
• RS485 Communication Port
• Battery Temperature Sensor (BTS) port

The Battery Temperature Sensor (BTS) port can only be used with lead-acid batteries.

2.3. System Setup

Diagram: Wiring diagram illustrating the connection of the battery charger to a Starter Battery, Smart DC Alternator, Renogy BT-2 Bluetooth Module, and 12V Auxiliary Battery. Lines indicate connections for Positive, Negative, Temperature, Communication, and IGN Signal.

ℹ️ The wiring diagram only shows the key components in a typical DC-coupled off-grid energy storage system for illustrative purposes. 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.

3.1. Recommended Tools & Accessories

Illustration: Icons representing Phillips Screwdriver (#1), Insulating Gloves, Measuring Tape, and Insulation Tape.

ℹ️ Prior to installing and configuring the battery charger, prepare the recommended tools, components, and accessories.

ℹ️ Choose proper mounting screws specific to your installation site. This manual takes self-tapping screws for wooden walls as an example.

ℹ️ For how to size bare wires, refer to "3.2. Size Wires" in this manual.

ℹ️ In this manual, the red cable represents the positive cable, and the gray cable represents the negative cable.

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.

Remember that the lower the gauge number, the less resistance the wire has and therefore the higher current it can handle safely. For details on how to size wires for a system, refer to "Sizing Wires for PV Systems" at Renogy Learning Center.

ℹ️ The cable specifications listed above account for critical, less than 3% voltage drop and may not account for all configurations.

ℹ️ 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 starter battery, auxiliary battery, and the other necessary devices with the relevant cables.

You can mount the battery charger vertically on a wall or horizontally on the floor.

Diagram: Shows mounting dimensions (5.91 inches / 150 mm clearance on all sides) and environmental operating conditions (-40°F to 185°F / -40°C to 85°C temperature, 0% to 95% humidity). Icons indicate 'Keep Dry', 'Fragile', 'Ventilation', 'Indoor'.

⚠️ 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.

❗ 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 -40°F to 185°F (-40°C to 85°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.

ℹ️ The battery charger should be as close to the battery as possible to avoid voltage drop due to long cables.

ℹ️ 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).

ℹ️ 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

Diagram: Shows the Renogy DC-DC Battery Charger with connection terminals.

Inspect the battery charger for any visible damage including cracks, dents, deformation, and other visible abnormalities. All connector contacts shall be clean and dry, free of dirt and corrosion.

❗ 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.

❗ Confirm the polarities of the devices before connection. A reverse polarity contact may result in 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.

ℹ️ 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.

3.5. Check the Auxiliary Battery

Recommended Components & Accessories:

• *12V Battery (9V to 16V)
• *ANL Fuse x 1
• Battery Adapter Cables x 2
• Fuse Cable x 1

Wire gauge recommendations for models:

• RBC20D1U (Output): 10 AWG
• RBC40D1U (Output): 8 AWG
• RBC20D1U (Input): 8 AWG
• RBC40D1U (Input): 6 AWG

ℹ️ Components and accessories marked with "*" are available on renogy.com.

ℹ️ To ensure optimal system performance, a 10 AWG/8 AWG cable should be no longer than 3 meters. Choose higher gauge cables for longer distances. For details, see "3.2. Size Wires" in the user manual.

Diagram: Shows a 12V battery, ANL Fuse, Battery Adapter Cables, and Fuse Cable.

1. Inspect the battery for any visible damage including cracks, dents, deformation, and other visible abnormalities. All terminals shall be clean and dry, free of dirt and corrosion.

The battery charger can only be connected to 12V 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 carelessly getting electrolyte in your eyes, flush your eyes with clean water immediately.

Combine batteries in parallel or in series as needed. Prior to installing the battery charger, ensure all battery groups are installed properly.

ℹ️ 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

ℹ️ In the formula, U represents the battery voltage, and 1, 2, or 3 represents the battery number respectively.

ℹ️ This battery charger works seamlessly with 12V battery systems. Please consult the battery manual for accurate system voltage information. Ensure that the 16V overvoltage protection is not triggered for 12V 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 16V.

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.

ℹ️ For details on how to install and use the ANL Fuse, see its user manual.

Diagram: Shows ANL Fuses.

3.7. Check the Alternator on Your Automobile

Recommended Components:

• *ANL Fuse x 1
• Battery Adapter Cables x 2
• Fuse Cable x 1

Wire gauge recommendations for models:

• RBC20D1U (Input): 8 AWG
• RBC40D1U (Input): 6 AWG

Diagram: Shows ANL Fuse, Battery Adapter Cables, and Fuse Cable.

ℹ️ Accessories marked with "*" are available on renogy.com.

❗ Do not use the cables if there is any visible damage.

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 and ensure that the alternator power does not exceed 720W with the output current within the range of 75A to 100A.

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, and repeat Step 3.

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.

ℹ️ 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.

4.1. Wear Insulating Gloves

Illustration: Hands wearing insulating gloves.

4.2. Connect the Battery Charger to an Auxiliary Battery

The battery charger can only be connected to 12V 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: On the battery charger, connect one negative battery adapter cable (gray) to the Negative Output Terminal, and connect one positive battery adapter cable (red) to the Positive Output Terminal.

Step 2: Connect the other end of the positive battery adapter cable (red) to an ANL fuse which should be then connected to a fuse cable.

Step 3: On the auxiliary battery, connect the negative terminal and positive terminal to the other end of the negative battery adapter cable (gray) and the other end of the fuse cable respectively.

Diagram: Step-by-step illustration of connecting the battery charger to an auxiliary battery, including installing cables on the charger, installing an ANL fuse, and installing cables on the battery.

ℹ️ Tug on cable to ensure firm connection.

4.3. Connect the Battery Charger to a Starter Battery

Before installing the charger, consult your vehicle's user manual or contact the vehicle manufacturer to ensure that the output current ranges from 75A to 100A.

• Traditional DC Alternator (IGN connection not required): The starter battery begins charging the auxiliary battery when its voltage reaches 13.2V & 15s and stops charging when the voltage drops to 12.7V.
• Smart DC Alternator (IGN connection required): The starter battery begins charging the auxiliary battery when its voltage reaches 12V & 15s and stops charging when the voltage drops to 11.5V.

Step 1: On the battery charger, connect one negative battery adapter cable (gray) to the Negative Input Terminal, and connect the positive battery adapter cable (red) to the Positive Input Terminal.

Step 2: Connect the other end of the positive battery adapter cable (red) to an ANL fuse which should be then connected to a fuse cable.

Step 3: On the auxiliary battery, connect the negative terminal and positive terminal to the other end of the negative battery adapter cable (gray) and the other end of the fuse cable respectively.

Diagram: Step-by-step illustration of connecting the battery charger to a starter battery (RV), including installing cables on the charger, installing an ANL fuse, and installing cables on the starter battery.

ℹ️ Tug on all cables to ensure firm connection.

4.4. Install a IGN Signal Wire (for Smart DC Alternator)

IGN signal wiring is required for smart alternators only. For how to distinguish a smart alternator from a traditional one, refer to "3.7. Check the Alternator on Your Automobile" in this manual.

For smart alternators, insert the IGN Signal Wire connector into IGN signal wire port, and then connect the other end to the smart alternator's ignition signal port.

The wiring method varies specific to your automobile model. Follow the wiring instructions or consult the automobile supplier for wiring details.

Diagram: Shows a Smart DC Alternator and the connection of the IGN Signal Wire to the battery charger.

4.5. Install a Battery Temperature Sensor

The temperature sensor measures the surrounding temperature of the battery and compensates the floating charge voltage when the battery temperature is low.

Mount the sensor securely at a suitable location in close proximity to the battery.

Diagram: Shows the battery temperature sensor being mounted near a battery and connected to the battery charger.

❗ Do not use the temperature sensor on a LiFePO4 (LFP) battery which comes with a battery management system (BMS).

4.6. Wire Inspection

Verify that all cable connections are firmly and securely fastened. This step is essential to prevent any loose or unstable connections that could lead to operational issues or safety concerns.

Diagram: Shows arrows indicating wire inspection on the battery charger.

Battery Status Indicator

• Solid: The battery charger is in standby mode*, or the auxiliary battery is fully charged.
• Flash: Charging the auxiliary battery

Fault Status Indicator

• Off: No fault
• Slow flash: Reverse contact protection for starter battery
• Solid: Overtemperature protection for auxiliary battery
• Slow flash: Overtemperature protection for battery charger
• Fast flash: Overvoltage protection for auxiliary battery
• Jumping flash: Overdischarge shutdown protection for auxiliary battery

Battery Type Indicator

• Solid: SLD/AGM
• Solid: GEL
• Solid: LI (lithium battery activation disabled)
• Solid: LI (lithium battery activation enabled)
• Solid: User Mode
• Solid: FLD

6.1. Set a Battery Type

Renogy 12V 20A/40A DC-DC Battery Charger provides one easy-to-use button for setting the auxiliary battery type in your system.

Upon installing the battery charger, set a correct battery type for the connected auxiliary battery either by using the Battery Type Setting Button or in the Renogy app. The battery type settings on the battery charger will automatically synchronize with the Renogy app, and changes made in the app will also reflect on the charger.

• Method 1: Press the Battery Type Setting Button to switch between different battery types. The LED indicates the battery type by displaying in different colors.

Diagram: Shows the battery charger with the Battery Type Setting Button and LED indicators for different battery types: SLD/AGM, GEL, LI (Lithium battery activation disabled), FLD, User Mode, LI (Lithium battery activation enabled).

• Method 2: On the home screen in the Renogy app, tap the battery charger icon to enter the device details page. Tap "... > Settings > Battery Type" to choose the battery type in use. For details, see "7. Monitoring".

❗ It is essential to ensure that the battery type setting is configured correctly to avoid any potential damage to the battery charger because any damage to the battery charger resulting from an incorrect battery type setting voids the warranty.

6.2. User Mode

Setting the battery type to User Mode allows you to customize your battery parameters. You can modify the parameters in the Renogy app.

Illustration: Screenshot of the Renogy app showing battery parameters like House Battery Volts, Starter Battery Volts, Starter Battery Amps, and House Battery Charging Amps.

6.3. Configure Charging Parameters

Before modifying battery parameters in User Mode, check the table below and consult the battery manufacturer to check whether modification is allowed. Incorrect parameter setting will damage the device and void the warranty. For how to adjust charging parameters for batteries in User Mode, refer to "6.3. Configure Charging Parameters" in this manual for details.

You can set the charging voltage and current for the battery charger in the Renogy app. For how to connect the battery charger to your phone via the Renogy app, refer to "7. Monitoring".

Illustration: Screenshots of the Renogy app showing settings for charging parameters like Equalization Volts, Boost Volts, Float Volts, etc.

Set Charging Voltage

The table below illustrates the default and recommended voltage parameters for batteries that can be connected to the battery charger. The parameters may vary depending on the specific battery you use. Read the user manual of the specific battery or contact the battery manufacturer for help if necessary.

❗ Before modifying battery parameters, check the table below first. Incorrect parameter setting will damage the device and void the warranty.

❗ Read the user manual of the battery when customizing a preset battery. Incorrect battery type selection damages the battery charger and voids the warranty.

• *For lithium batteries, set the Overvoltage Shutdown value by following the formula below: Actual Overvoltage Shutdown = Default Overvoltage Shutdown + (Boost Voltage you have set for the battery charger - Default Boost Voltage in User Mode). The maximum Overvoltage Shutdown value is 17V.

• *When the voltage of the living battery is greater than or equal to the boost recover voltage, wait for 5 seconds, the charger transitions from the Boost phase to the Boost Charging phase.

• *When the voltage of the living battery is greater than or equal to the float charge return voltage, wait for 5 seconds, the charger re-enters the Boost Charging phase from the Float Charge phase.

Set Charging Current

Setting the charging current for the battery charger is allowed in the Renogy app.

6.4. Activate Lithium Batteries

The battery charger can activate connected lithium batteries. Lithium batteries may enter sleep mode when the built-in protection is triggered. In such case, the battery charger provides a small current to reactivate the sleeping lithium battery. The lithium battery can be charged normally after successful activation.

ℹ️ By default, the lithium activation function is disabled in the battery charger. You can manually enable it in the Renogy app. For details, see "7. Monitoring".

Operation Condition Set the battery type of the battery charger to LI. For details, see “6.1. Set a Battery Type”.

Operation Logic If the battery voltage drops below 6V, the battery charger automatically activates the activation function (on the premise that the activation function is enabled in the Renogy app) and continues to charge the battery using constant voltage until the battery voltage reaches 12.6V.

Required Components and Installation Instructions

Step 1: Connect the Renogy BT-2 Bluetooth Module to the RS485 Communication Port on the battery charger. After the connection, the Bluetooth Module POWER indicator light will remain solid green.

Step 2: Place the Bluetooth module at a suitable site.

Diagram: Shows the Renogy BT-2 Bluetooth Module connected to the battery charger.

ℹ️ Accessories marked with "*" are available on renogy.com.

ℹ️ Before adding this product to the Renogy app or Renogy ONE, please ensure that both the app version and the firmware version of Renogy ONE have been updated to the latest version.

Download the Renogy app. Login to the app with your account.

Illustration: QR code for downloading the Renogy app, screenshots of the Renogy app interface, and icons for Google Play and App Store.

ℹ️ Make sure the Bluetooth of your phone is turned on.

ℹ️ The version of the Renogy app might have been updated. Illustrations in the user manual are for reference only. Follow the instructions based on the current app version.

ℹ️ Make sure that the battery charger is properly installed and powered on before it is paired with the Renogy app.

ℹ️ To ensure optimal system performance, keep the phone within 10 feet (3 m) of the battery charger.

7.1. Short-Range Monitoring

If only short-range monitoring is required, connect the battery charger to the Renogy app directly through Bluetooth on your phone.

Step 1: Open the Renogy app. Tap + to search for new devices.

Step 2: Tap Confirm to add the newly found device to the device list.

Step 3: Tap the battery charger icon to enter the device information interface.

Pair the battery charger with the Renogy app. Monitor and modify the parameters of the battery charger via the app.

Diagram: Illustrates the process of pairing the battery charger with the Renogy app via Bluetooth, showing app screens for searching and confirming devices.

7.2. Wireless Long-Range Monitoring

If long-range communication and programming are required, connect the battery charger to Renogy ONE Core (sold separately) through Bluetooth, and then pair Renogy ONE Core with the Renogy app.

Required Components and Installation Instructions

Illustration: Shows the Renogy ONE Core device.

ℹ️ Components marked with "*" are available on renogy.com.

ℹ️ Make sure that the Renogy ONE Core is powered on before the connection.

ℹ️ For pairing instructions for Renogy ONE Core, see Renogy ONE Core User Manual.

ℹ️ Make sure the battery charger does not communicate with any other device.

Step 1: Connect the battery charger to Renogy ONE Core through the Bluetooth of your phone.

Step 2: Pair the Renogy ONE Core with the Renogy app through Wi-Fi or by scanning the QR code in the Renogy ONE Core. On Renogy ONE Core, go to "System > Settings > Pair with App" to get the QR code.

Diagram: Illustrates the long-range monitoring setup involving the battery charger, BT-2 module, Renogy ONE Core, internet connection, and the Renogy app.

8.1. Working Logic

Renogy 12V 20A/40A DC-DC Battery Charger begins to charge the auxiliary battery based on the actual voltage of the starter battery as well as the DC alternator type.

• Traditional DC Alternator (IGN connection not required): The starter battery begins charging the auxiliary battery when its voltage reaches 13.2V & 15s and stops charging when the voltage drops to 12.7V.
• Smart DC Alternator (IGN connection required): The starter battery begins charging the auxiliary battery when its voltage reaches 12V & 15s and stops charging when the voltage drops to 11.5V.

8.2. Charging Logic

The battery charger utilizes a four-stage battery charging algorithm for a rapid, efficient, and safe battery charging. The stages include: Bulk Charging, Boost Charging, Float Charging, and Equalization.

Diagram: Shows the four-stage charging logic with Voltage (U/V) and Current (I/A) curves over time. Stages are Bulk Charge, Boost Charge (Constant Voltage), Float Charge, and Reset to Bulk Charge. Key points labeled: Maximum Current, Reduce Current, Minimum Current, Increase to Maximum Current. Reference points labeled: 1 Equalization Voltage, 2 Boost Voltage, 3 Float Voltage, 4 Undervoltage Recover Voltage.

ℹ️ Adjust the time depending on the specific battery bank size.

9.1. Fault Indicator Errors

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

9.2. Built-in Protection Mechanisms

The battery charger provides multiple protection mechanisms at the input terminal, output terminal, and battery charger sides.

10.1. Dimensions

20A DC-DC Battery Charger (RBC20D1U)

Diagram: Shows the dimensions of the 20A DC-DC Battery Charger. Length: 9.31 in (236.5 mm), Width: 5.17 in (131.5 mm), Height: 2.75 in (70 mm).

ℹ️ Dimension tolerance: ±0.2 in (0.5 mm)

40A DC-DC Battery Charger (RBC40D1U)

Diagram: Shows the dimensions of the 40A DC-DC Battery Charger. Length: 9.31 in (236.5 mm), Width: 6.00 in (152.5 mm), Height: 3.56 in (90.5 mm).

ℹ️ Dimension tolerance: ±0.2 in (0.5 mm)

10.2. Technical Specifications

11.1. Inspection

For optimum performance, it is recommended to perform these tasks regularly.

• Ensure the battery charger is installed in a clean, dry, and ventilated area.
• Ensure there is no damage or wear on the cables.
• Ensure the firmness of the connectors and check if there are any loose, damaged or burnt connections.
• Make sure the indicators are in proper condition.
• Ensure there is no corrosion, insulation damage, or discoloration marks of overheating or burning.
• If the battery charger is dirty, use a damp cloth to clean the outside of the device to prevent dust and dirt from accumulating. Before the battery charger is powered on, make sure it is completely dry after cleaning.
• Make sure the ventilation holes are not blocked.

ℹ️ In some applications, corrosion may exist around the terminals. Corrosion can loosen springs and increase resistance, leading to premature connection failure. Apply dielectric grease to each terminals contact periodically. Dielectric grease repels moisture and protects the terminals contacts from corrosion.

⚠️ Risk of electric shock! Make sure that all power supplies are turned off before touching terminals on the battery charger.

11.2. Cleaning

Follow the steps below to clean the battery charger regularly.

• Disconnect all cables connected to the battery charger.
• Wear proper protective equipment and use insulated tools during operation. Be careful when touching bare terminals of capacitors as they may retain high lethal voltages even after power is removed.
• Wipe the housing of the battery charger and connector contacts with a dry cloth or nonmetallic brush. If it is still dirty, you can use household cleaners.
• Make sure the ventilation holes are not blocked.
• Dry the battery charger with a clean cloth and keep the area around the battery charger clean and dry.
• Make sure the battery charger is completely dry before reconnecting it to the starter battery and auxiliary battery.

11.3. Storage

Follow the tips below to ensure that the battery charger is stored well.

• Disconnect all cables connected to the battery charger.
• By applying dielectric grease to each terminals, the dielectric grease repels moisture and protects the connector contacts from corrosion.
• Store the battery charger in a well-ventilated, dry, and clean environment with the temperature from -40°F to 185°F (-40°C to 85°C).

12.1. Fire

1. Disconnect all cables connected to the battery charger.
2. Put out the fire with a fire extinguisher. Preferable fire extinguishers include CO₂ and ABC. Alternatively, you can use water to put out the fire if there are no preferable fire extinguishers.

❗ Do not use type D (flammable metal) fire extinguishers.

12.2. Flooding

1. If the battery charger is submerged in water, stay away from the water.
2. Disconnect all cables connected to the battery charger.

12.3. Smell

1. Ventilate the room. Disconnect all cables connected to the battery charger.
2. Ensure that nothing is in contact with the battery charger.

12.4. Noise

1. Disconnect all cables connected to the battery charger.
2. Make sure no foreign objects are stuck in the fan of the battery charger or the ring terminal.

ℹ️ The normal noise value of the battery charger is less than 40 dB during operation. If the noise is abnormal, contact our technical service through renogy.com/contact-us.

FCC Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to the following 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.

Any Changes or modifications not expressly approved by the party responsible for compliance 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 does cause 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 20 cm between the radiator & your body.

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