Renogy RBC20D1U User manual

VERSION A0
DC-DC Battery Charger
Renogy
12V 20A/40A
RBC20D1U/RBC40D1U
QUICK GUIDE

Before Getting Started
The quick guide provides important operation and maintenance instructions for Renogy 12V
20A/40A DC-DC Battery Charger (hereinafter referred to as battery charger).
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 battery charger, potentially rendering it inoperable.
Online Manual
Quick Guide User Manual

What’s In the Box?............................................................................................................................ 1
Dimensions .......................................................................................................................................2
Get to Know Renogy Battery Charger ...........................................................................................3
System Setup...................................................................................................................................5
Required Tools..................................................................................................................................6
Step 1. Wear Insulating Gloves .......................................................................................................6
Step 2. Plan a Mounting Site........................................................................................................... 7
Step 3. Connect the Battery Charger to an Auxiliary Battery ...................................................8
Step 4. Connect the Battery Charger to a Starter Battery......................................................10
Step 5. Install a IGN Signal Wire (for Smart DC Alternator).......................................................12
Step 6. Install a Battery Temperature Sensor............................................................................13
LED Indicators................................................................................................................................14
Set a Battery Type .........................................................................................................................16
USER Mode...................................................................................................................................... 17
Table of Contents

Monitor the Battery Charger........................................................................................................18
Short-Range Monitoring via DC Home App................................................................................. 20
Wireless Long-Range Monitoring.................................................................................................... 21
Important Safety Instructions ................................................................................................... 22
Renogy Support ............................................................................................................................ 24
FCC Statement.............................................................................................................................. 26
FCC Radiation Exposure Statement............................................................................................27
Disclaimer.......................................................................................................................................27

— 1 —
What’s In the Box?
VERSION A0
DC-DC Battery Charger
Renogy
12V 20A/40A
RBC20D1U/RBC40D1U
QUICK GUIDE
Renogy 12V 20A/40A
DC-DC Battery Charger × 1
Quick Guide × 1
IGN Signal Wire
(3 m) × 1
Battery Temperature
Sensor (2 m) × 1
Mounting Screws x 4
ST4*16 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.

— 2 —
Dimensions
5.17 in (131.5 mm)
1.59 in
(40.5 mm)
2.75 in
(70 mm)
8.56 in (217.5 mm)
9.31 in (236.5 mm)
20A DC-DC Battery Charger (RBC20D1U)
6.00 in (152.5 mm)
1.59 in
(40.5 mm)
3.56 in
(90.5 mm)
8.56 in (217.5 mm)
9.31 in (236.5 mm)
40A DC-DC Battery Charger (RBC40D1U)
Dimension tolerance: ±0.2 in (0.5 mm)

— 3 —
Get to Know Renogy Battery Charger
Positive Output Terminal
Mounting Hole
Battery Temperature
Sensor (BTS) port
RS485 Communication Port
Negative Output Terminal
Battery Type Setting Button
Mounting Hole
Battery Type Indicator
Fault Status Indicator
Battery Status Indicator

— 4 —
Mounting Hole
Mounting Hole
IGN Signal Wire Port
Positive Input Terminal
Negative Input Terminal
The Battery Temperature Sensor (BTS) port can only be used with lead-acid batteries.

— 5 —
System Setup
12V Auxiliary
Battery
Starter Battery
+
-
+
-
IGN
Smart DC Alternator Renogy BT-2
Bluetooth Module
Bluetooth Module
2
Communication IGN SignalTemperature
NegativePositive

— 6 —
Required Tools
Measuring Tape
3
4
5
6
Insulation TapeInsulating Gloves
Phillips
Screwdriver (#1)
Prior to installing and configuring the battery charger, prepare the recommended tools,
components, and accessories.
Step 1. Wear Insulating Gloves
Insulating Gloves

— 7 —
Step 2. Plan a Mounting Site
The battery charger requires adequate clearance for installation, wiring, and ventilation. The
minimum clearance is provided below.
5.91 in
(150 mm)
5.91 in
(150 mm)
5.91 in
(150 mm)
0% to 95%
-40°F to 185°F
-40°C to 85°C KEEP DRY FRAGILE VENTILATION INDOOR
5.91 in
(150 mm)
The battery charger should be installed on a flat surface protected from direct sunlight.

— 8 —
Step 3. Connect the Battery Charger to an Auxiliary Battery
The battery charger can only be connected to 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).
Recommended Components & Accessories
*12V Battery Fuse Cable × 1*ANL Fuse × 1 Battery Adapter Cables × 2
M10
M10
M5
+
-
RBC20D1U: 30A
RBC40D1U: 40A
9V to 16V
RBC20D1U: 10 AWG
RBC40D1U: 8 AWG
RBC20D1U: 10 AWG
RBC40D1U: 8 AWG
Accessories marked with “*” are available on renogy.com.
For installation details, see the user manual of the battery in use.
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 the user manual
of the battery charger at www.renogy.com/support/downloads.

— 9 —
Battery
Adapter
Cable
ANL
Fuse
Fuse
Cable
+ -
-
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
1 2
2
M5 M5
1 2

— 10 —
Step 4. 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 alternator power does not exceed 720W with the output current
within the range of 75A to 100A.
Recommended Components & Accessories
*ANL Fuse × 1
M10
M5
RBC20D1U: 40A
RBC40D1U: 80A
Fuse Cable × 1Battery Adapter Cables × 2
M10
RBC20D1U: 8 AWG
RBC40D1U: 6 AWG
RBC20D1U: 8 AWG
RBC40D1U: 6 AWG
Accessories marked with “*” are available on renogy.com.
The starter battery stops charging the auxiliary battery when the starter battery voltage
drops below 12.7V.

— 11 —
Battery
Adapter
Cable
Fuse Cable
ANL Fuse
+ -
Starter Battery
+
-
STEP-1 Install cables on the battery charger
STEP-2 Install an ANL fuse
STEP-3 Install the cables on the RV starter battery
1
1 2
2
M5 M5

— 12 —
Step 5. 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, see the user manual of the battery charger. If the DC alternator of the
vehicle is a smart alternator, 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.
Consult the RV supplier for wiring details.
Smart DC Alternator
IGN
Signal
Wire

— 13 —
Step 6. 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.
Do not use the temperature sensor on a LiFePO4 (LFP) battery which comes with a
battery management system (BMS).
Mount the sensor securely
at a suitable location in
close proximity to the battery.
Battery
Temperature
Sensor

— 14 —
LED Indicators
The battery charger turns on automatically after power on with the LED indicators working in
accordance with the relative operating status.
Battery Status Indicator
Solid: SLD/AGM
Solid: GEL
Solid: LI (lithium battery
activation disabled)
Battery Type Indicator
Solid: FLD
Solid: LI (lithium battery
activation enabled)
Solid: User Mode
Solid: The battery charger is in
standby mode*, or the auxiliary
battery is fully charged.
Standby Mode*: The battery charger is only connected to the
auxiliary battery, and the auxiliary battery voltage is greater than 12V.
Flash: Charging the auxiliary battery
Fault Status Indicator
Solid: Short-circuit protection on auxiliary battery or starter battery
Reverse contact protection on starter battery
Solid: Overtemperature protection on auxiliary battery
Slow flash:
O: No fault
Slow flash: Overtemperature protection on battery charger
Fast flash: Overvoltage protection on auxiliary battery
Jumping flash: Overdischarge shutdown protection on auxiliary battery

— 15 —
Graphic ndications of ON and OFF
LED ON LED OFF
Graphic expression of Solid, Slow Flash, Fast Flash, and Jumping Flash
LED Pattern Description Graphic Expression
Solid
The LED remains continuously
illuminated without any
variation.
Slow Flash
In this mode, the LED alternates
between being on and off at
a relatively slow and regular
interval of 1s.
1s
2s
1s
Fast Flash
In this mode, the LED alternates
between being on and off at
a relatively fast and regular
interval of 0.1s.
0.2s
0.1s0.1s
Jumping Flash
In this mode, the LED alternates
between brief 0.5s on-off cycles
followed by a longer 2.5s off
period.
0.5s 0.5s 0.5s
4s
2.5s