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HLP Data BMS4S User Manual

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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.
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Summary of Contents for HLP Data BMS4S

  • Page 1: Table Of Contents

    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.

  • Page 2: Introduction

    Normal usage BMS4S is switched on as long as it has power on terminal +12V. Normal usage is to take a look at the LED every now and then. If it is blinking twice, then there is less than 20% energy left in the batteries.

  • Page 3: Basic Configuration

    Then press it until you see 3 long blinks on the LED. This will decrease the voltage when BMS4S will stop charging with 0.10 V, which equals approx. 80% SoC when using default settings. Or keep in pressed until 4 long blinks on the LED.
  • Page 4 TimePrintout= 0 s TimeMemlog= 315/600 s The first block of lines describes some basic setup of BMS4S: WorkMode= 1: this means that a current shunt is connected. The value to set is calculated by adding the values for the following features:...
  • Page 5 +2048 precharge on port BC1 (no automatic balancing possible), use if supervised mode So, if you e.g. have connected a current shunt and have two BMS4S supervising each other you shall give the command wm=5. BatterySize= 100 Ah: size of installed LFP bank. Change with bs=nnn as implied by the capital letters.
  • Page 6 VoltVerylow= 3.000 V: this is when all loads will be disconnected. You can use this e.g. if you have a second bi-stable relay isolating the batteries completely. If BMS4S is not disconnected it will go into low power mode and only do the most important tasks in a slow paste, like switching on the system again once charging has brought the voltage up to VoltswitchOnagain.
  • Page 7 The sixth block of lines describes when and what to do when the alternators temperature is getting high. Temptarget4= 95 C: when the alternator exceeds 95 degrees Celsius, BMS4S will regulate down charging current and keep the temperature around 95. However, the temperature is a slow feedback on how much power the alternator generates, so the temperature will fluctuate a bit around the set value.
  • Page 8 Send these then to support@hlpdata.se and we will take a look and return recommendations on regulation-settings. 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.

  • Page 9: Additional Commands

    pv print version l2= second search step for charge limit rb reboot l3= third search step for charge limit rp reprogram s1-4= set battery volt sl= set led blink-level (%) sc= set current (A) wm= set work mode sf= save factory data t1= temp low charging (C) sm= set missing current t2= temp high battery warn (C)
  • Page 10 Half a second after you have given the command, BMS4S will sent it to the radio. When this is done you will see a blink on the LED. After that you have 10 seconds to reconnect to get the response that the radio gave to your command. Unfortunately, not all bluetooth devices work exactly the same.
  • Page 11 The second reason is that it takes time to create unbalance, and therefore doing manual rebalance by charging all four cells individually one or two times a year with the 3.6 V charger is normally sufficient since BMS4S will always keep all cells within set boundaries.
  • Page 12 I you want a more exact current measurement you need to find out when BMS4S first detects charging, and enter this value here measured in Amps. The default setting will normally work fine, so this is not necessary to do.

  • Page 13: System Commands

    (-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 of the actual cell. Example s4=3.233 You can as an alternative set the accumulated value of that cell, the result will be the same Example s4=13.3...

  • Page 14: Installation

    Installation When you start the electrical system looks something like above. You often have a starter battery and a house battery. These 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.
  • Page 15 CONNECTED. If you want to test the BMS4S before installation, connect – and B0 to battery minus first, and then +12 and B12 to battery plus (and then command wm=2 to tell BMS4S that only 12 V is connected). More details on each connection can be found in the next chapter.

  • Page 16: Equipment Connection Description

    1. Plan where to put the BMS4S, the relay, the buzzer/alarm, the led for low SoC warning and the push-button for simple adjustment of charge level and to wake up the Bluetooth interface. 2. Start with connecting the relay on the cable between the man panel and the LFP cells.
  • Page 17 So, let us instead discuss how the equipment in the picture shall be connected to BMS4S. We’ll take them one by one, but first a warning: NEVER CONNECT +12 V BEFORE – AND B0 ARE CONNECTED. If you want to test the BMS4S before installation, connect – and B0 to battery minus, and then +12 and B12 to battery plus (and then command wm=2 to tell BMS4S that only 12 V is connected).
  • Page 18 (NC). Then connect the relays control wires 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.

  • Page 19: Testing

    +12V and a wire to the alarm/buzzer so that it can notify you if something fails. Then you connect the two together by two wires going from Osup on one BMS4S to Isup on the other, and vice versa. Then change working mode on both to “normal working mode + is supervised by and supervising a second BMS4S”.

  • Page 20: 4Sbalancer

    If you have a 3.6V charger it is normally enough if you use it to fully charge all cells one or two times a year with it. Since BMS4S always act on the first cell reaching a boundary, there will be no harm...
  • Page 21 But if you still want the balancing to be fully automatic you can buy the 4SBalancer and connect it to BMS4S and the cells. It is built very robust with relays instead of transistors to minimize the risk of harming the cells.

  • Page 22: I/O Description

    +12V power supply, entry point for the power from the battery. BMS4S will use less than 10 mA during normal operations, but this terminal is also driving all equipment on...
  • Page 23 Gvolt connection point for the voltage sense cable from the alternator Osup terminal to connect two BMS4S together for supervision, must never exceed 5 V Isup terminal to connect two BMS4S together for supervision, must never exceed 5 V battery balancing control, connects to terminal with the same name on HLP data 4Sbalancer if you have one.

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