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After assembly, each board needs to be tested and approved before it may be used in a battery. The testing must be done immediately after assembly. It should take no more than a minute to test a board once the setup is in place. Gain test Set up the multim...

Three boards 76, failed in Stale's battery in the field - does not run LEDs, SOC output is wrong 99, exhibits wrong SOC value 100, exhibits wrong SOC value Nr. 99 At 37.03V input from the PSU, the scope measures 8.42V @ SOC 11.95V @ 12V 3.38V  @ ...

White board The most simple design. This board consists of 5 LED's with series limiting resistors and a pushbutton that triggers them. It is connected to the BMS board through a 7 pin connector, and after reverse engineering it, the proposed schematic is: ...

Generally, it has always been a headache to upload to 328PB chips using the Arduino IDE interface. With the latest batch, it is just impossible it seems. Install AVRDUDE, on Windows from here: https://github.com/mariusgreuel/avrdude Generate the hex file u...

Uses 20700 cells, not 18650. Rare, problematic.

Module layouts The group 1 is the one furthest away from the BMS. With the 'old method' before the laser cut nickel sheets: Nickel pieces Turnaround 6P 1 Sideways 1P 3 3P 17 Sideway 2P 5 ...

Comes with at least 3 different types of BMS. Almost always 36V, but some are 48V. The 48V charger has a blue plug, otherwise looks identical.

Some types of chargers for the 48V BH battery show that one of its pins seem to be different than the others, and also, since this one has no connection to our BMS, it doesn't allow to charge the battery. Measuring the voltage on it, we can see 5 V so, we h...

We can use our smart SOC boards for all the bananas, and the non-Brose plastic flat ones. We never tested with the metal ones, but probably okay too. On all BH bikes, the charger is 'dumb', it is only positive and negative. You can use the original charger co...

When the smart SOC board is attached to the battery, it can produce a decent spark: High (30-60V) battery voltage Uncharged input capacitor on DC/DC converter Inductance of the battery wires Without a limiting resistor, the current spikes to near...

On the original board, it is possible to pull the data output to 42V, and the current will be only milliamps. In fact, the whole signal will go up - the signal amplitude is max 3.3V or 5V or whatever. We don't do this. That could be the reason why we killed t...

Source: https://endless-sphere.com/forums/viewtopic.php?t=70198 Quote: An Arduino compatible board and a few discrete components Add a 5V source, i usually use a LM2596HV dc dc converter for this. A USB powerbank or even running it from two or three Cells on...

R = 10k Reading Yamaha communication II (13/08) Regarding the Yamaha battery from workshop with the BMS designed by ourselves, the same procedure for trying to read the communication has been tested, getting to the conclusion that the communication is ...

Purple trace: Yedlik board Green trace: original board We attached a 10k pull-up resistor to 3.3V to each battery's middle pin. 3.3V is supplied by separate desktop power supplies. Tuning the pull-up resistor value The original board's output amplitude i...

Setting up the test Turn the current off on the DC supplies before connecting the board, otherwise the spark might murder the DC/DC converter on the board The correct order: Make sure crocos are disconnected Give a little current Set up the desire...

The good thing about the Version 3.0 of our Yamaha Board design is that can fit both BJT and MOSFET transistors. In the case of using MOSFET's, the consumption goes lower and the quality of the signal is improved. However a part of the circuit must be changed...

This is the current waveform in one loop cycle. Higher current when SCI on Lower current when SCI off (it is actually sleeping) Let's determine the average. Imax = 21 mV / 10 Ohm = 2.1 mA Imin = 0.6 mV / 10 Ohm = 0.06 mA Ttotal = 265.6 ms T_Imax =...

Baseline Current consumption, with the transistors disconnected: 9.82 mA @ 30V 7.5 mA @ 42V Interestingly, if I put the Arduino to powerDown all the time, it still consumes 7.13 mA @ 42V. The RECOM RPMH-0.5 3.3V fix output DC/DC converter has only 16 ...