Kemo M102A Second Battery Charger Instruction Manual
- June 12, 2024
- Kemo
Table of Contents
Kemo M102A Second Battery Charger Instruction Manual
M102A | Second battery charger 6 – 24 V/
For lead accumulators 6 to 24 V. With this accumulator separating filter 2 accumulators are charged separately at one source of charging current (vehicle generator, solar systems, windmills, chargers etc). For charging currents up to 10 A at maximum (with cooling 20 A). The charging current distributes in such a manner that an empty battery will be charged more than an battery that is almost charged. It is perfect for motor caravans if one battery operates the television, radio etc. and the second battery must remain charged in order to start the motor. Or for weekend cottages if one battery used for the alarm system must not be emptied.
A compensating current of approx. 0.005 A may flow between both accumulators (during normal operation at 12 V). This serves the purpose to enable a solar regulator, which is possibly connected in series the possibly necessary voltage control
CONNECTION EXAMPLES
Important! The aluminium base plate must not be exposed to mechanical
tension (do not drill holes, do not screw on an uneven cooling surface, etc.).
Sensitive electronic components are mounted directly adjacent on the inside of
the aluminium base plate, which become defective in case of mechanical
movements and the module then won’t work any longer!
Use as directed:
For simultaneous charging of 2 batteries which are discharged independently of
each other via different and separated consumers.
Circuit description
As a modification to the precursor module M102N, a very low compensating current flows between both batteries in this module (only approx. 0.005 A during normal operation at 12 V). This is necessary if electronic solar regulators are added to the input of the M102A. Many solar regulators require an electrical connection to the battery in order to measure the voltage of the battery and thus to prevent an overcharge.
That is why a internal high-resistance connection is bypassed from each battery to the input of the M102A passing the battery switch. Most of the modern solar regulators then operate at the switch. It may happen that the solar regulators start „pumping“ when the battery voltage approaches the mark „Full“. But this is normal and no error (pumping* = switching on and off at short intervals).
The battery separating filter leads the charging current separately to both connected batteries. On this occasion the charging current distributes according to the charging condition of the batteries (a battery which is almost charged receives less charging current than a battery which is nearly empty). Thus the batteries are not directly connected in parallel. The second battery charger is a voltage separating filter only, but no charging regulator! Thus the conventional charging regulator suitable for the connected batteries must be superposed between voltage source and module M102A in order to avoid overload of the batteries! The battery charging regulator is an integral part in cars. In case of solar systems and wind generators, the conventional charging regulator must be connected in series, too, then the battery separating filter must be connected behind it. Furthermore, the charging regulator must be suitable for the maximum charging current and voltage of both connected batteries. The batteries must always have the same voltage (never connect a 6 V battery and 12 V battery at the same time). Although the connected batteries are charged from one joint voltage source by means of the battery separating filter, they may be discharged independently.
Assembly instruction
In case of large batteries, especially if these are empty and strong power sources are available (e.g. car generators), a higher current may flow and the module heats up. During normal operation (charging current < 10 A) it is sufficient to install the module in a well ventilated place in such a manner that the metal base plate of the module will not heat up to more than 70 degree C. If higher charging currents are to be expected (up to maximally 20 A), it is necessary to mount the module with the metal surface flat on a cooling metal surface (e.g. an additional metal plate 20 x 30 cm, 3 mm thick or something similar). The heat dissipation must be in such a manner that the metal base plate of the module does not heat up to more than 70 degree C. The above data relate to the total current for both batteries and not per battery! A safety fuse must be connected in series according to the drawing. Please only use such kind of cable which is adjusted to the high current conduction (cross section > 1 mm2, perfect 2.5 mm2). When installing into a motor vehicle, please pay attention to the conventional safety regulations such as: safety fuse connected in series, cable laying must carried out in such a manner that the insulation of cables cannot be damaged (danger of fire caused by an electrical default) etc
Setting into operation:
After wiring according to the safety regulations and connection sketch, the
connected batteries may be charged by switching on the voltage source.
Important installation instructions, please note!
Depending on the load the module heats up. The heat is dissipated from the aluminum plate at the bottom of the module. Under certain circumstances it must be mounted on a cooling surface according to installation instructions. It is important that the module is fixed with 4 M3 screws (or 2.9 mm metal screws) on the cooling surface. This may be the back wall of a metal casing. The aluminum plate on the bottom of the module must not bend, do not use larger screws and do not drill larger holes. The screw heads must rest on the plate of the module, rather than on the plastic edge of the module! During assembly, the module should not be curled up (if the ground is not flat). The reason: on the inside of the aluminum base of the module the thin insulating layer are directly soldered on the electronic SMD components. When the aluminum floor of the module curls up, the joints and the module start loosen and the module is defective. Please ensure that the maximum specified temperature (as specified in the module‘s description) is not exceeded. Otherwise apply a larger cooling plate.
Technical data
Batteries to be connected: 2 each of the same voltage 6 – 24 V/DC
Max. charging current: 10 A, with cooling 20 A at maximum (total current)
Dimensions: approx. 87 x 60 x 33 mm (without fixingstraps)
Important: Please pay attention to the “General Information” in the printed matter no. M1002 attached in addition. This contains important information starting and the important safety instructions! This printed matter is part of the product description and must be read carefully before assembling!
Disposal: This device may not be disposed with the household waste. It has to be disposed at collecting points for television sets, computers, etc. (please ask your local authority or municipal authorities for these collecting points for electronic waste.
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Documents / Resources
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M102A Second Battery
Charger
[pdf] Instruction Manual
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References
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