Endless Sphere

Yes, much better.

The 850C open source firmware is not for the bafang motors but for the tsdz2 motor with open source firmware.

Connect a small 12V lamp between a terminal of your battery and the case. See if there is any current flow. The rest voltage you measured should dissappear when that lamp is connected. Digital meters are very sensitive and hardly need any current to get a readout. It's for instance possible that a 1...

https://github.com/OpenSource-EBike-fir ... -540186577

This might answer some of your questions.

This makes sense as it's the task of the bms to protect every individual cell group.
So if one of those groups reaches the low voltage treshold, the BMS will turn the battery off to prevent further discharge of it.

You need to look at what BMS you are having. The more intellegent ones have a serial interface or a bluetooth interface that permits to monitor the cell groups and allows to adjust some of the parameters. IMHO it's a feature that shouldn't be optional for a BMS board.

If you test it without the y splitter cable, are the speed readings different?
Did you only change the displays, or the firmware version as well?

@Platypus, so you have the "non throttle" motor and want to add a throttle if I resume correctly? If you have the 6 wire display connector, than the throttle input isn't leaving the controller. It's only doing that on the throttle enabled motor. So you would need to bring the throttle sign...

Depending upon the value of the shunt, it will generate a slight voltage drop when some current passes trough it.
Maybe that's why they don't all measure the same voltage if you place them in serie?
When there is no current flowing, they should all measure the same voltage.

I totally agree, but would they really risk battery safety for that? How much imago damage does it do when a battery of a sudden brand catches fire? Another reason for not using them could be space. In a car, it's not really a problem if the pack is half an inch higher. On a bike, they might try to ...

Another thing you might ask is why most commercial e-bike batteries don't have individual cell fuses? Tesla Model S and Model X batteries are not easy to service. Maybe the idea with the fuses is that the battery can remain functional, even if some of the individual cells become disconnected. The ba...

If one cell in a parallel group behaves badly and starts to have a lower voltage than the others, all the others will pump current into that one cell untill it's voltage becomes equal. On an e-bike, it's usually 3 - 5 cells that will do that. On a tesla pack, you have a lot more parallel cells. This...

Isn't the motor controller firmware initially updated using the plug that goes to the speed sensor (and also has the light signal) ? It's also possible to set a configuration bit that allows updating the motor controller firmware using the serial port that connects to the display. It's using the mot...

You could try the "open source firmware" The usb adapter you need to reflash the motor is really cheap. If you don't like it, it's no big loss. You could also try a higher voltage battery like a 13S (48V) or even a 14S (52V). This obviously is not a cheap solution if you already have a 36V...

Are you using the standard firmware or the osf firmware on the motor? With controller I assume you replaced the controller pcb in the motor? Maybe Tongsheng is more focussing on the european market with a power limit of 250W It probably can handle peaks of 750W, but it might overheat if you continou...

I doubt it's a wise idea to let people modify config parameters without knowing exactly what they do. Some changes could easily fry your controller. To avoid such, a configuration program that only allows to change the non harmfull things within their acceptable limits is a better solution. Compilin...

A throttle should need 3 wires. 1 is supply, 2 is gnd and 3 is throttle signal which is an analog voltage that increases when you give more throttle. Some throttles use a hall sensor and others use a potentiometer. You should have 3 wires coming from your throttle that connect to the motor controlle...

You could install a 52T front chainring instead of the standard (42T?) one.
That will make it possible to increase speed and still help with pedaling.
It will reduce Torque at lower speeds when you are climbing a hill or mountain.

It usually happens when the batteries stay in the unit for a longer time. AA will leak as well. It's often hard to tell how old some batteries are. They could have been in the shop for 2 years before they got sold. Duracell does a lot of advertising, but they start leaking as well. Due to the fact t...

I was under the impression the configurator was initially made for configuring the kuteng controllers with open source firmware. I have no idea who started writing it and if it comes with a GPL or other license. So, what is so special about Marcoq his configurator that shouldn't be revealed to the p...

Developers have decided to stop using the LCD3 as it's microcontroller is not having enough flash memory for further code development. The display code base is becoming to big for that display. The new favorites are the 850C and the SW102. The SW102 has a buildin bluetooth interface so it can connec...

A good spotwelder has a "controlled current", "controlled welding time" and "controlled electrode pressure" I am not saying you can't assemble a battery with a diy spotwelder, but it complicates things. For a range of 100+ km, you will need a large and heavy battery. Ho...

There are indeed 2 types of TDSZ2. One allows braking by rotating the pedals backwards, the other doesn't. The motor uses a special bearing that grips in one direction and freely rotates in the other to obtain the freewheel of the pedals. No idea what is used in the other model that allows braking.

1C is typical the nominal capacity for 1 Hour. So, if your cells are 2150mAh and you discharge at 1C, you discharge with 2150mA

They say they measured the capacity at 0.2CA discharge, so I asume that's 2150mA / 5 = 430mA

The capacity in the specification is given at a discharge rate of 0.2CA. That would equal discharging at 430mA instead of 1A No idea if discharging slower would make a big difference, but worth a test. Also note that 4.0V is not fully charged. To fully charge you need to go to 4.2V and keep it at th...