Akumon A2 - 12V LFP battery management board - New Version 2
The Akumon has new improved functions of following operation:
- Emergency overvoltage level output above 16V-17V (output marked >17V)
- Low voltage warning - signals the low voltage status for the battery, with adjustable detection between 11.5V and 12.5V (output marked <11V)
- Emergency deep discharge voltage level output bellow 10.5V - with adjustable level and hysteresis (output marked <10V)
- Serial output for monitoring of the proper function of multiple AKUMONs - serial output. (marked <5V)
The second generation of AKUMON is especially recommended for monitoring of more batteries, for example in 24V, 36V and 48V DC systems.
Study the detailed specification:
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Akumon A2 - 12V LFP battery management board - New Version 2
Improved version of the AKUMON battery monitor and balancing board to allow easy management of 12V lithium monolithic batteries.
Akumon - check the function (if delivered in 2012)
Some of our partners have reported that Akumons from last shipments in 2012 were not working properly. We kindly ask all customers to check the Akumon function. In some cases the Akumon may discharge the battery continually until the battery is fully depleted. If you need any help, please contact our technical department. We will gladly offer a solution for you.
FAQ: How to connect the signal outputs of multiple Akumons
Answer: The Low Voltage Output (VYBITO / VYB) and the Over Voltage Output (>17V) are galvanic separated outputs. This means it is possible to connect these outputs in parallel to get the signalization. The parallel connection works as „one of any“: this means if one of the Akumon signals the hazardous status, the data line will be connected.
NOTE – WARING: Never connect the Balancing Output (EXT) of different AKUMONS together! Since the balancing output is connected to the battery, you will make a short-circuit connection if you connect the EXT lines together!
Installing 6 Akumons to monitor up to 6 pcs of 12V LP packs
This is a photo from our customer showing an installation of 6 pcs of Akumon management boards together with a service battery and relay. This installation is designed to monitor up to 6 pcs of 12V LP block batteries.
High speed balancing with high currents using Akumons
A simple solution using the automotive 12V relay and the 12V halogen bulbs.
Simple solution to make a 24V battery pack
Two 12V batteries (here 12V 60A) are packed together. A plastic handle is mounted too, to allow easy carrying of the pack.
A high power fuse (400A) and two Akumons are mounted inside a plastic box.
Installation diagram for a battery pack based on the 12V monolithic LP batteries
This diagram give details on how to install the battery pack using the 12V monolithic LP batteries. This solution is especially suitable for small systems like EV boats operating at 24V (2 batteries), 48V (4 batteries) or EV cars (with 6 and more batteries). Download the PDF file with the installation.
The management of the battery pack is done by means of the AKUMON AKM-A1. The low discharge warning can be optionally given by the BM1 - battery monitor connected to each 12V battery. The voltage of each battery is provided by means of the APM1 - Battery Indicator.
If you have any suggestions or questions to this installation, please let us know.
Testing the Akumon
The yellow LP battery is the traction battery. The black battery (the board battery) provides the current for the external relays connected to the Akumon board. The two blue 12V relays disconnect the charger (over voltage) and the load (low voltage).
FAQ: AKUMON - the LED indicators
Question: What is the function of the 4 LED (diodes) on the Akumon 12V lithium battery management board?
Answer: the LED marked as D9 (red) indicates the balancing of the battery. D10 indicated the over voltage level. D11 gives optical indication of the low voltage level. D12 gives warning when the traction battery is connected with the reverse polarity.
Please note that when the battery is connected with the reverse polarity, the battery will be slowly discharged through the balancing resistor. In order to prevent this from happing the LED D12 gives the reverse polarity indication.
The Akumon - a photo of the cabling (detail)
This is a photo of the cabling of the Akumon (lithium 12V battery management board). Please note that the power cables from the traction battery are always connecter to the battery + / - connector. The outputs are powered from another 12V battery (the board battery).
FAQ: AKUMON - the external load
Question: What is the size of the external resistor that can be connected to the EXT output to increase the balancing of the battery?
Answer: The size of the internal resistor is 47 Ohm. This means the standard ballacing current at 17V is about 0.4A. If you want to increase the ballancing current you can connect the external load (Rx resistor). Please see the specification of the external balancing load.
Please note: for currents above 3 amps, there is a need for cooling of the power MOSFET transistor on the AKUMON board. You can attach the aliminium cooler or use a small computer fan. The small FAN can be powered from the EXT output.
The Akumon - the connection diagram
The Akumon battery management board allows to connect 3 relays to 3 outputs:
Balancing Output (EXT) - this output allows to connect external load (Rx) to increase the balancing current. This output can also be used to power the relay to reduce the charging current from High to Low. This relay is powered by Akumon directly.
Low Voltage Output (VYBITO) - this output allows to indicate the low voltage level (~ 10.0 V). This output is an open collector MOSFET transistor switch. A separately powered relay or contactor may be attached to disconnect the load when battery voltage is too low.
Over Voltage Output (>17V) - this output allows to monitor the overvoltage voltage level (approx. 17 V). It is an open collector MOSFET transistor switch. A separately powered relay or contactor may be attached to disconnect the charger when battery voltage is too high.
The Akumon 12V LP battery monitor board
GWL/Power is introducing a specialized battery monitor and balancing board to allow easy management of 12V lithium monolithic batteries.
The Akumon battery management board has following functions: voltage level monitoring with 3 target voltage levels: the low voltage (battery is discharged), the balancing voltage (the battery is fully charged), the over voltage (the voltage of the battery has increased over the maximal level). There are two open emitter transistors that allow signaling the voltage levels to other devices. These two signals are: the low voltage level (typically bellow 10V), the over voltage level (above 17V)
The Akumon also provides the balancing function for the optimizing of the final part of the charging process. When the balancing voltage level is reached (typically 15V), the Akumon board connects a resistor to load the battery. This way the charging current is reduced and battery is balanced. In addition to the primary balancing resistor on the board, there is a connector for external load that allows to increase the balancing load when needed.
Please note: The Akumon does not provide the power contactor function. In order to disconnect the power circuit under load some external high current relays or contactors must be used. These are NOT provided with Akumon.
Additional information about the Akumon board and its function will be released in the coming days.