MANUAL - ON-BOARD BATTERY FOR MOTORHOMES - RKB ELECTRONIC AG
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Manual
On-board battery
for motorhomes
www.rkb-ag.de
Version: 01-09/20
All Rights, also the photomechanical reproduction and the storage to medias, reserve by RKB elec-
tronic AG. The use or dissemination from the devote resources of this product, models, charts or pic-
tures in not allowed. Also copying, saving, devolving, reflecting or translate in due form is not allowed.
2Table of contents
General information...........................................................................................4
About this manual..................................................................................4
Intended use..........................................................................................4
Safety introductions................................................................................5
General information LiFePo4.............................................................................8
Technical data RKB Smart Battery......................................................................9
Battery-Management-System (BMS)..............................................................10
Installation / assembly instructions................................................................12
„Single-mode“.......................................................................................12
„Parallel-mode“.....................................................................................14
General use information...................................................................................16
Charging................................................................................................16
Discharging...........................................................................................17
Storage..................................................................................................19
Maintenance and care.....................................................................................20
Inspection.............................................................................................20
Cleaning................................................................................................20
Recycling............................................................................................................21
Guarantee / warranty.......................................................................................21
Service/ Contact................................................................................................22
CE Declaration of Conformity...........................................................................23
3General information
About this manual
Please read the guidance carefully. You will get important information about the
installation and the working of the battery system. Attention should be paid to
the details for the safe using. RKB Electronic AG takes no responsibility for da-
mages, if the guidance was ignored.
This guidance is a part of the product. It is only for the battery system from the
company RKB Electronic AG. Retain this manual and provide it to the new owner
in the event of a change of the operating company. The plumper and the opera-
tor must always have access to this manual. The plumper must be familiar with
the guidance and follow the instructions.
Intended use
The RKB Smart Battery is designed to power up a mobile home, caravan or tiny
houses.
Attention, the Battery is not made to start up a car or engine.
It is only allowed to charge the Lithium Iron Phosphate battery with a compa-
tible charger and it is only allowed to use the battery in the technical range, you
see on page 8.
Please make sure, that the battery is safe from moisture or wetness.
Another use as before written down, could cause damages to the product,
furthermore could be dangerous, for example bypass, fire, electric shock and
so on.
Please do not change or rebuilt the whole product.
Please observe the safety instructions in this manual!
4Safety introductions
Please carefully observe the following safety instructions for handling the bat-
tery or rechargeable battery pack. Ensure safe handling to avoid hazards cau-
sed by incorrect handling. Handling of batteries larger than 100 Wh should be
reserved for qualified personnel. Keep these safety instruction in a suitable and
accessible place, or in the same place as the battery.
• Do not short-circuit a cell or battery pack as heat may be generated. To avoid
a short circuit, the battery pack should not come into contact with metal ob-
jects or liquids that are not intended for the operation of the battery pack.
• Do not throw the battery pack into the fire as it may expand and/or ex-
plode. Do not expose the battery to chemicals, chemical fumes, acids
or any other aggressive media. The battery may be damaged. Store
the battery pack at room temperature, never near a source of heat or
at an ambient temperature of over 50°C! The same applies to tem-
peratures below freezing. Check the rechargeable battery every 3
months, unless the operating instructions explicitly refer to a different
time interval, to its state of charge. If necessary, it should be charged.
• Do not disassemble or modify the battery pack. Do not remove the co-
ver. Any modification or alteration to the battery will immediately void the
warranty and liability on the part of the company RKB electronic AG. Do
not apply mechanical pressure to the battery or damage it in any other
way. Stop using the battery if it is damaged (even if the damage appears
harmless). In the event of any damage or malfunction of the battery pack,
it must be stored outside a building on a fire-proof and weather-protected
location that is inaccessible to unauthorized personnel. Noncompliance
will immediately void the warranty and liability on the part of RKB elec-
tronic AG. In the event of damage or a defect, always contact the manu-
facturer. Tel. 0049 (0) 7237 48634-0. Here you will be provided with the
correct information about the further procedure. To ship a battery, the
guidelines for transporting dangerous goods must be complied with. Da-
maged batteries may not be transported without consultation with RKB.
Noncompliance will immediately void the warranty and liability on the part
of RKB electronic AG.
5• Do not immerse the battery pack in water or other liquids, or expose it to
strong rain/moisture as it may be damaged, corrode, or impaired in its fun-
ction. At worst, it will short-circuit. (See 1.).
• Ensure unimpeded heat dissipation and ventilation during this process. For
example, do not cover the battery, do not place any objects on it, or the like.
• The battery pack may only be charged using the designated charger. Do
not charge under conditions which are not listed in the instruction manual.
Noncompliance will immediately void the warranty and liability on the part
of RKB electronic AG.
6• Do not charge the battery in an environment containing flammab-
le objects or media. Do not leave the charging battery unattended
or leave it attached to the charger whilst fully charged. When char-
ging the battery generates heat (See 5.1). Charging should normally be
done only at room temperature (about 15° C - 25° C). Avoid charging a
cold battery, which damages the cells, especially in cold outdoor tem-
peratures. In winter or cold storage or similar, always warm the bat-
tery to room temperature before charging it under optimal conditions.
• IMPORTANT!! To charge the guidelines according to VdS 2259 must be ob-
served.
Present operating temperature Relative humidity during operation
-20°C to 50°C 25% to 95%
Present charging temperature Room temperature during storage
0°C to 50°C -20°C to 60°C
Optimum temperature during Relative humidity during storage
operation 10°C to 30°C 25% to 95%
• Only use the battery pack for its intended purpose and never for other
devices or applications. During operation, the battery generates heat. En-
sure good heat dissipation and ventilation during operation. Avoid dirt and
dust. If there are any impurities to be removed, clean it only when dry. Use
a soft cloth, brush, or soft non-metallic brush.
• Keep the battery pack out of the reach of babies and children to prevent
accidents and eliminate potential hazards.
7General information LiFePo4
The lithium-iron-phosphate technology (LiFePO4) is the safest of the family of
lithium-ion technologies. It is high-current resistant, universally applicable and
has a low weight compared to lead based batteries. In addition, the latest lithi-
um-iron technology offers a high degree of intrinsic safety, so that there is no
risk of explosion even under the most extreme conditions. A 12.8V LiFePO4 bat-
tery consists of 4 single cells connected in series, each with a nominal voltage
of 3.2V. A built-in battery management system (BMS) also reliably protects the
battery cells from damage.
• High safety
• High-current resistant
• Allows high power charging
• Less weight, compared to lead based batteries
• All mounting positions possible
• High-/low temperature
• Temperature stable
• Over 3000 cycles at 80% DoD
• 100% maintenance free
• 1:1 replaceable to lead based batteries
• Environment friendly, no lead, no acid
8TechniCAL DATA RKB Smart Battery
50Ah 100Ah 150Ah 200Ah
Nominal capacity 50Ah 100Ah 150Ah 200Ah
Energy 640Wh 1280Wh 1920Wh 2560Wh
Lithium technology LiFePo4 LiFePo4 LiFePo4 LiFePo4
Nominal voltage 12,8V 12,8V 12,8V 12,8V
Working voltage 10,0 to 14,8V 10,0 to 14,8V 10,0 to 14,8V 10,0 to 14,8V
Cycle life (100% DoD) ≥2000 ≥2000 ≥2000 ≥2000
Cycle life (80% DoD) ≥3000 ≥3000 ≥3000 ≥3000
Cycle life (55% DoD) ≥8000 ≥8000 ≥8000 ≥8000
Self dischargeBattery-Management-System (BMS)
The battery management system is designed to save the Battery cells from
dangerous operation status. The main functions will be explained below.
Overcurrent protection:
The BMS switches off the battery outputs in case of overload, to protect the
cells. The battery has no voltage at this point, after disconnecting the device
which generated the overload, the battery resets by itself.
Overdischarge protection:
Each cell will be checked against overdischarge by itself. If the battery out-
puts are switched off as a result, they can only be released again by charging.
Attention: The BMS protects the cells from deep discharge during active use,
a deactivated or empty battery, which is not charged for a longer period of
time, could be damaged by its low but existing self-discharge (3% per month).
Note: A battery that has been completely discharged should be charged as soon
as possible!
Note: Even small loads such as Alarm systems, relays or standby systems consu-
me capacity and discharge your battery. If the battery is not used for a long time,
ensure that it is disconnected from the system by disconnecting the positive
pole.
Overvoltage protection:
LiFePO4 battery cells are not allowed to charge above 3.60V/cell and 14.4V/bat-
tery, otherwise the cells will be destroyed by overvoltage. Therefore only suita-
ble chargers with an end-of-charge voltage of 14.4V may be used to charge the
LiFePO4 batteries. The BMS protects the cells from overcharging, but it has to
absorb the electricity itself. This is possible for a short time, but not permanently.
Note: A permanently too high charging current above 14.4V can damage the BMS!
10Overtemperature protection:
The LiFePO4 cells are monitored by the BMS over a temperature sensor. The
BMS constantly checks, that the temperature does not reach over 70°C. If it
does, the System switches off the output of the battery. To enable the output
again, the battery has to cool down first. For this purpose, no power may be
drawn or charged for up to 30 minutes.
The BMS also controls the temperature itself. If it heats up to over 90°C, the
system switches off for its own protection. The output can only be enabled
again after it has cooled down. For this purpose, no power may be drawn or
charged for up to 30 minutes!
Short circuit production:
In case of a short circuit, the BMS switches off the output terminals immedi-
ately to protect the cells from critical damage. If the short circuit is removed,
the BMS resets the terminals automatically. This reset could take up to 30min.
11Installation/ assembly instructions
Installation:
When installing the RKB Smart Battery, always ensure that the battery is fixed
tightly. The battery can be fixed with straps as well as with brackets.
It is recommended to mount the battery in a standing or lying position. Please
never mount the battery upside down.
Terminal/ Assembling:
The RKB Smart Battery usually has a M8 screw-terminal or a car connector co-
nus.
If necessary, it can be converted by using an adapter.
It is recommended to install a fuse as a second protection unit. It could be pos-
sible that there is still a fuse install the System. In both casess make sure that the
fuse is adapted to the performance of the battery.
„Single-mode“
If the RKB Smart Battery is running on single mode, pay attention to the polarity
of the Terminals. Also make sure that the cable dimensions are suitable to the
performance of the battery. To avoid voltage drop, design the cable length as
short as possible.
12Charge
controller &
load
+ -
12 V
RKB Smart Battery
Attention!
Never use a damaged battery!
Pay attention to the polarity of the battery!
13„Parallel-mode“
In parallel operation, it is possible to connect any number of RKB Smart Bat-
teries of the same type, capacity and age in parallel. It must be ensured
that all batteries are fully charged „individually“ before the first start-up.
To ensure that all batteries are optimally charged, the positive connection of
the load should be connected to the first battery in the parallel connection and
the negative connection of the load to the last battery in the parallel connec-
tion. The cable cross-sections should also be adapted to the system power
and the cables should be kept as short as possible to minimise voltage drop.
14Charge
controller &
+ - load
12 V
RKB Smart Battery
+ -
12 V
RKB Smart Battery
+ -
12 V
RKB Smart Battery
+ -
12 V
RKB Smart Battery
Attention!
Never use a damaged battery!
Pay attention to the polarity of the battery!
Each Battery should be fully charged before
connecting together!General use information
Charging
Only charge the RKB Smart Battery with a suitable charger which uses CC/CV
charging mode. Note that not every Motorhome charger is suitable for use with
LiFEPo4 Batteries!
Chargers with different charging programs must be set to „LiFe“ or “LiFePO4”.
If the setting is not availible, please check the charger manual, how a LiFePo4
battery should be charged.
You are also welcome to contact us to double-check your charger.
An incorrectly set charger will destroy your battery!
CC/CV charging
The RKB smart Battery should be charged CC/CV-mode. This charging procedure
is based on two parts, the constant current mode (CC) and the constant voltage
mode (CV).
In the first CC-mode the battery is charged with a constant current till the vol-
tage rises to 14,6V (charge voltage) then the charger switches to CV-mode and
hold the charge voltage. The nominal charging current will drop more and more
until it arrives at 0A. Then the charging cycle is finished.
Attention!
An incorrectly set charger could destroy the Battery!
16Discharging
While discharging the RKB Smart Battery it is protected via the BMS system,
but it should be ensured that the load limits of the individual types are com-
plied with as listed below:
50Ah 100Ah 150Ah 200Ah
Nominal capacity 50Ah 100Ah 150Ah 200Ah
Energy 640Wh 1280Wh 1920Wh 2560Wh
cell technology LiFePo4 LiFePo4 LiFePo4 LiFePo4
Nominal voltage 12,8V 12,8V 12,8V 12,8V
Working voltage 10,0 to 14,8 V 10,0 to 14,8 V 10,0 to 14,8 V 10,0 to 14,8 V
Discharge cut off voltage 10V 10V 10V 10V
continuous discharge 50A 100A 150A 200A
current
Peak discharge current 100A 200A 300A 400A
max. 5 sec. max. 5 sec. max. 5 sec. max. 5 sec.
continuous discharge 640Wh 1280Wh 1920Wh 2560Wh
capacity
Ppeak discharge power 1280Wh 2560Wh 3480Wh 5120Wh
max. 5 sec. max. 5 sec. max. 5 sec. max. 5 sec. max. 5 sec.
Temperature max 50°C 50°C 50°C 50°C
Temperature min. -20°C -20°C -20°C -20°C
17Discharging
It is also advisable to set devices which are connected to the battery (e.g. inver-
ters) if possible to a discharge voltage of 10.5-11.0V in order to ensure enough
tolerance between the switch-off values. If the BMS switches off due to under-
voltage, please charge the battery immediately.
To increase standby time, it is recommended to use a separator when the bat-
tery is not in use. This prevents the battery from being discharged be the stand-
by currents of connected devices.
Protect the battery from direct sunlight on hot summer days and ensure ade-
quate ventilation. It also makes sense to insulate the battery against frost in
winter. Both measures are not absolutely necessary, but will help to extend the
lifetime of your RKB Smart Battery.
Attention!
If the battery switches off due to undervoltage,
please charge the battery immediately.
18Storage
The following points help to increase the lifetime of your Smart Battery while
storing it:
• Never charge the battery to 100% before a long storage time. The best
storage capacity is around 50-70%.
• Disconnect all loads from the battery to prevent the battery from dischar-
ge currents while in storage.
• Protect the battery terminals with a cover against short circuit.
• If the LiFePO4 battery is stored for a longer period, it must be checked
and recharged to 50-70% every year!
• Low temperatures down to -20°C don´t damage the battery, so in most
cases it is not necessary to remove the battery from the motorhome. But
you should ensure that very cold batteries are slowly adapted to higher
temperatures. If the battery is heated up to quickly, it could be damaged
from condensation water inside the housing.
Attention!
Never use a maintenance charger with a “floating”
or “pulse” current while storing the battery.
19Maintenance and care
Inspection
• Periodically check that your cables and contacts are tight, have no deforma-
tion, cracks or damage!
• Check the battery housing for damage. Never charge or discharge a damage
dbattery. Please get in contact with RKB to verify functionality.
• If the discharging or charging time changes significantly in relation to the
new condition, the battery should be checked or replaced due to its opera-
ting age!
• Periodically check the state of charge, is the battery below 10% please char-
ge the battery. The self discharge rate of a LiFEPo4 battery could be up to 3%
per month, provided there is no load connected.
• Consider replacing the LiFePO4 battery, when the useable capacity drops
under 80% of the design capacity
Cleaning
For external cleaning of the box use a dry cotton cloth. Do not clean inside the box!
Note: Do not clean the battery wet or with chemicals.
20Recycling
The battery system should not be disposed with normal household waste.
Modules, packages and spare parts have to be disposed with the legal regula-
tions of the country by where the battery was installed.
For further information, see: https://www.rebat.de/de
Garantie
RKB electronic AG provides a guarantee for this product, provided it is instal-
led and operated as described in these instructions.
The guarantee / warranty on this product expires immediately if the product is
installed differently or is not operated in the range of the technical data rage
on page 13.
We apologize if there are any complaints about our products. Please check
before a return that it is not an application or setting error.
You are welcome to send us an email in advance at info@rkb-ag.de with a
description of the error and preferably with a picture of the problem.
You can also contact our service department as follows:
Service Hotline:
+49(0)7237-48634-400
Mo-Fr: 8:00-16:00
21Service/Contact
Order processing / Commercial service
Phone no.: +49(0)7237-48634-400
E-Mail.: service.400@rkb-ag.de
Technical Service
Phone no.: +49(0)7237-48634-450
E-Mail.: service.450@rkb-ag.de
RKB electronic AG
Otto-Hahn-Str. 19
75248 Ölbronn-Dürrn
Germany
Tel: +49(0)7237-48634-0
Fax: +49(0)7237-48634-181
Mail: info@rkb-ag.de
www.rkb-ag.de
22CE Konformitätserklärung
Hiermit erklären wir, RKB electronic AG, Otto-Hahn-Str. 19, DE-75248 Ölbronn-Dürrn, dass die
nachfolgend bezeichneten Geräte aufgrund Ihrer Konzipierung und Bauart sowie in der von
uns in Verkehr gebrachten Ausführung den einschlägigen grundlegenden Sicherheits- und
Gesundheitsanforderungen der EG-Richtlinien entsprechen.
Bei einer nicht mit uns abgestimmten Änderung der Geräte verliert diese Erklärung ihre
Gültigkeit.
Bezeichnung des Gerätes: RKB Smart Battery LiFePo4
Geräte Typ: Art.No. 7.130.0001 12,8V/50,0Ah
Art.No. 7.130.0005 12,8V/100,0Ah
Art.No. 7.130.0003 12,8V/150,0Ah
Art.No. 7.130.0004 12,8V/200,0Ah
Einschlägige EG-Richtlinien: EMV Richtlinie (2014/30/EU)
Angewandte harmonisierte Normen: EN 61000-6-1:2007
EN 61000-6-3:2007 A1:2011
Adresse: RKB electronic AG
Otto-Hahn-Str. 19 · DE-75248 Ölbronn-Dürrn
Tel.: 07237/48634-0 · Fax: 07237/48634-181
E-Mail: info@rkb-ag.de · Internet: www.rkb-ag.de
Diese Erklärung wird unter der alleinigen Verantwortung des Herstellers und falls zutreffend,
seines Bevollmächtigten ausgestellt.
Ansprechpartner:
Yolanda Gutiérrez
Vorstand / Managing Board
Ölbronn-Dürrn, Januar 2021
23Otto-Hahn-Str.19
D-75248 Ölbronn-Dürrn
Tel: +49(0)7237-48634-0
Fax: +49(0)7237-48634-181
Mail: info@rkb-ag.de
www.rkb-ag.de
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