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BMS4S user manual 1.4 

Valid for software version 1.4.55  

 

BMS4S DIY kit: ......................................................................................................................................... 1 
Introduction ............................................................................................................................................ 2 
Normal usage .......................................................................................................................................... 2 
Basic configuration .................................................................................................................................. 3 
Additional Commands ............................................................................................................................. 9 
System Commands ................................................................................................................................ 13 
Installation ............................................................................................................................................ 14 
Equipment connection description ....................................................................................................... 16 
Testing ................................................................................................................................................... 19 
4SBalancer............................................................................................................................................. 20 
I/O description ...................................................................................................................................... 22 

 

BMS4S DIY kit: 

 

The basic kit contains: 1: a BMS4S PCB, 2: and a box to mount it a in. Beside this you might also need 
3: three temperature sensitive resistors, 4: a push-button for temporary charging level setting, 5: a 
12 V LED for low SoC early warning, 6: a Bluetooth radio for communication with BMS4S, 7: an 
adapter for serial to USB connection to BMS4S, and 8: a buzzer/alarm. 

Содержание BMS4S

Страница 1: ...ion 16 Testing 19 4SBalancer 20 I O description 22 BMS4S DIY kit The basic kit contains 1 a BMS4S PCB 2 and a box to mount it a in Beside this you might also need 3 three temperature sensitive resistors 4 a push button for temporary charging level setting 5 a 12 V LED for low SoC early warning 6 a Bluetooth radio for communication with BMS4S 7 an adapter for serial to USB connection to BMS4S and 8...

Страница 2: ... is described in chapter Normal usage Available commands are described in three places Basic configuration Additional commands and System commands All commands are built from one or two small letters so in the Basic configuration chapter the commands can be derived from the printout the capitals in each line is the command to use to change that setting To give any commands that changes any setting...

Страница 3: ... to the Bluetooth device If you give the command p print you will get a printout looking like this U 3 264 3 268 3 262 3 266 13 060 I 1 335 SoC 35 This U means that all four cells have 3 26 V each adding up to 13 06 V Next I means that right now there are 1 335 A leaving the batteries this only works if you have connected BMS4S to a current shunt but that is not necessary for it to work And SoC me...

Страница 4: ... current shunt is connected The value to set is calculated by adding the values for the following features 0 workmode normal 1 there is shunt connected 2 measures 12V only 4 supervised and supervising another BMS4S 8 xtemp is used to supervise a battery 16 xtemp is used to supervise an alternator 32 switch off Bluetooth instead of sleep will save some 3 mA 64 Swedish CSV comma separated values in ...

Страница 5: ...s based on the last 900 seconds 15 minutes TimeBeep 300 ms each beep will be 300 ms long If you have a really loud beeper you might want to shorten this to achieve a bearable sound level TimeRelay 300 ms when the bi stable relay is operated it is done with a 300 ms long pulse TimeprecharGe 0 s if you have equipment with high start up current you might want to pre charge them before operating the r...

Страница 6: ...since it then bases the coulomb counting on what value is set for BatteryCharging If you find multiple similar entries in the extreme point log command pe before an unbalance is cured you can increase this with e g 25 to speed up the process The third block of lines describes how and when a low voltage event shall be handled i e when shall the loads be disconnected StartLedblinking 20 when SoC get...

Страница 7: ...t beeping high voltage The fifth block of lines describes battery temperature limits Templow1 5 C if charging is started with battery temperature lower that this a low temperature charging will start beeping and charging will be stopped for a preset time see command tc If you do not have any temperature sensors installed on the batteries their temperature will be reported as 20 degrees Tempwarn2 5...

Страница 8: ...tings Limit step1 25 This is how fast BMS4S shall look for the kick in point Values between 20 and 50 is normally ok Limit step2 10 This is how fast BMS4S shall react when the alternators temperature differs more than 3 degrees Celsius from target Limit step3 2 This is how fast BMS4S shall react when the alternators temperature differs less than 3 degrees Celsius from target And the last block con...

Страница 9: ...wm 0 workmode normal 1 shunt connected 2 12V only 4 supervised 8 x is bat temp 16 x is alt temp 32 BT hard off 64 Swedish CSV 128 always count coulomb 256 only p at tp 512 power off when high bat temp 1024 all off port charge on 2048 precharge on port BC1 1 blink SoC 0 9 2 blink SoC 10 19 10 blink SoC 90 99 2 beep low temp charging 3 beep high battery temp 4 beep low voltage 5 beep high voltage 6 ...

Страница 10: ...3 109 1 204 VBI 3 480 3 500 3 499 3 497 13 976 75 622 This time the log contained six entries can store around 50 entries The log is cleared by command ce The first four numbers in all lines are the voltage of each cell when the event happened The fifth is the total voltage and the sixth is the current at the event HVE means high voltage event HVA high voltage absorption event timeout has happened...

Страница 11: ... started with command tm The log can contain 288 entries Example of log with two entries interval 600 3 249 3 247 3 253 3 248 12 997 0 000 3 249 3 247 3 253 3 249 12 997 4 130 Each line contains voltage on cell 1 to cell 4 system voltage and current at that time This log is cleared when BMS4S is switched off or by command cm Clear Memory log po Print Other info will produce a printout of some othe...

Страница 12: ...rt to do it anyway it will improve the result First start by stating that there is a shunt connected command wm nn see command wm for what nn shall be Then definine the zero point ensure no load or charging sources are connected and give command sc 0 Then connect a load of known size and give command sc 15 5 if the load is 15 5 A And lastly connect a known charging source and give command sc 20 0 ...

Страница 13: ...own status this will reset the system to original settings as it was when it was shipped from the factory Example fr rp ReProgram If there are some new functions released this is used to update the BMS4S Exact usage is supplied together with the update package s1 4 Set voltage for cell 1 4 If you are sure that BMS4S reports a faulty voltage on a cell you can by this command set the correct voltage...

Страница 14: ...e are kept separate so that the starter battery is not used by the boat s consumers and they are charged via a charging distributor or a relay that switches on when the engine is running If you have bow thruster then you often also have a battery for it placed in the bow of the boat All batteries of course have switches and fuses installed ...

Страница 15: ... 13 8 V which is not enough to get lead batteries fully charged Therefore we recommend one more change remove the power distributor and connect the three cables together you get a setup looking like this Now the lead batteries have become backup for security and is not used during normal operation It is then enough to charge them every now and then which can be done by simply switch them on They w...

Страница 16: ...nnect the cables to the LFP cells Make sure you place the cables on the right cell Start with B0 11 Now it is just to connect power to BMS4S via the terminals 12V and minus ground 12 Now move the cables on the current distributor so they all are sitting on the same terminal unless you intend to keep a separate starter battery 13 Test the installation as described in chapter Testing below 14 Start ...

Страница 17: ...en BMS and the LFP cells Mark them in one end with labels B12 B9 B6 B3 and B0 Start connecting the B0 wire in B0 on BMS4S and then connect it to the battery minus terminal Continue with B3 which shall be connected to side of the first cell B6 to the second cells terminal B9 to the third and B12 to the fourth cells terminal Check each wire one extra time before connecting it to the battery 2 Open u...

Страница 18: ...s to terminal Load OFF and ground on the BMS4S Now the relay will break up the power feeding of the rotor when BMS4S activates it and the alternator will stop producing current This way is also how you connect relays switching off charging from other sources like solarpanels wind generators etc 6 Many modern alternators are also protected against overheating A simple test is to run it loaded for a...

Страница 19: ...ng each other and if one fails the other one will start beeping device failure while it still is supervising the LFP bank 13 If you intend to keep the batteries connected all the time also when leaving the boat for long times it can be wise to install a bi stable relay that isolates the battery completely in case of a low voltage incident It shall be connected to terminal All OFF and BMS54S sends ...

Страница 20: ... decreased the stop charging voltage with 2 volts which definitely will stop charging within the set delay Doing it this way will not generate any high voltage alarm 9 Restart charging by pressing the push button until the LED blinking stops 10 Stop the engine I this works ok then test the low voltage warning 1 Set the warning blink level to 100 command sl 100 2 The lead shall start blinking with ...

Страница 21: ...i nnn 1 0 is good 6 If you have no shunt connected use the model balancing only while charging command vd 0 nn 0 05 is good But if you anyway want to use model coulomb based balancing i e your cells are badly matched make sure the value for default charging is correctly set command bc nnn If you charge with lower current than the set value when the voltage passes the balance voltage vb 3 nn the un...

Страница 22: ...d ON produces a 12 V pulse to switch on the relay for all loads max 3A constant load Charge OFF produces 12 V to disconnect all charging sources max 3A constant load All OFF produces a 12 V pulse to disconnect loads when low voltage max 3A constant load minus ground can be used for relays for load and charge 12V power supply entry point for the power from the battery BMS4S will use less than 10 mA...

Страница 23: ...er for supervision must never exceed 5 V BC4 battery balancing control connects to terminal with the same name on HLP data 4Sbalancer if you have one BC3 battery balancing control connects to terminal with the same name on HLP data 4Sbalancer if you have one BC2 battery balancing control connects to terminal with the same name on HLP data 4Sbalancer if you have one BC1 battery balancing control co...

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