Endless Sphere

If there is more than 0.1v difference between the parallel cell group the board will transfer the highest parallel group voltage to the lowest parallel group until every parallel cell group is equalized. The tolerance is 0.03v, which is very good. I know what an active balance board is suppose to d...

I think you should clarify that this is what you mean before going around posting that you "think energy recover hardly justifies regen" That is also my opinion generally, not just for my use cases. I was answering your question as to what I meant by "personally". If measured ac...

I choose low maintenance for my own bikes, meaning direct drive hub motors without regen. So I sacrifice a little efficiency on both counts, in favor of reliability. How do you figure regen to negatively affect reliability of a system? Reversing reaction torque at the axle tends to loosen threaded ...

Easy way to find out number of coils in electric motor is to connect classic voltmeter to its power lines and slowly turn wheel by 360 degrees counting numbers of movement of the needle (pointer). Just verified that way my 205 50H V3 QS Motor, has 16 coils. Voltmeter was set to 3V DC... Hi Maciek, ...

Not sure what you mean by "personally," but there are definitely routes where it is possible to recover significant amounts of energy from regen... There are more situations where regen isn't worth the energy lost by not having freewheeling. Most people live in areas that became populated...

Personally I think the energy recovery hardly justifies regen Not sure what you mean by "personally," but there are definitely routes where it is possible to recover significant amounts of energy from regen... I mean wrt my own decision-making, prioritizing among the myriad factors. I set...

Personally I think the energy recovery hardly justifies regen. It's all about more efficient / effective braking, greater control on long descents with heavy loads afaic. With saving brake pad wear in between. Not sure what you mean by "personally," but there are definitely routes where i...

You CANNOT do this unless you disconnect the series connections between the 4S subpacks. Otherwise you will SHORT CIRCUIT the packs. Also the imax B6 at 50W max is going to take ~50 hours to charge a 20S12P battery assuming each cell is ~10Wh.

I know that the cell counts are configurable in the PC software, but can they be set below the range that they are advertised as being capable of handling? For example, if I buy the 15S version of the 10S-15S BMS linked below, can I configure the BMS to work properly on 8S? I am running 8S right no...

I know that the cell counts are configurable in the PC software, but can they be set below the range that they are advertised as being capable of handling? For example, if I buy the 15S version of the 10S-15S BMS linked below, can I configure the BMS to work properly on 8S? I am running 8S right now...

The link in his signature works for me (albeit slowly). I think PLA can work, but PETG/ABS/PC are much preferred due to their higher temperature handling capabilities. Thats weird. I moved my site to bluehost which is in US so americans would have faster service, gues its not that great I think it'...

How do you turn on your bike? Sometimes a standalone 12V battery is needed to power the coil on the contactor of the main battery. This is standard for large electric vehicles that are running 300V+ main battery packs. For a 20S battery, you may be electing to forgo a contactor in which case you co...

Thinking some more about what pronghorn wrote (among others), and wondering: thepronghorn wrote: ↑20 Oct 2020, 22:46 I'm not saying the per cell charge current decreases, just saying the total pack charge current decreases. 4P at 10A is 2.5A/cell, so a 2P pack would only be able to do 5A total. to ...

The link in his signature works for me (albeit slowly). I think PLA can work, but PETG/ABS/PC are much preferred due to their higher temperature handling capabilities.

How do you turn on your bike? Sometimes a standalone 12V battery is needed to power the coil on the contactor of the main battery. This is standard for large electric vehicles that are running 300V+ main battery packs. For a 20S battery, you may be electing to forgo a contactor in which case you cou...

This sounds like one of those trickle chargers that people leave on car batteries that they don't drive very often. I think it will work. You'll want to make sure the open circuit voltage of the 12V nominal panel minus the diode voltage drop matches the float charge voltage of the battery (normally ...

Looks like a nice, well thought out layout. I think the area you need to focus on is the row to row connections. Everything else seems pretty standard. You've written "bend or side bus bar". I don't really like the bend - you'll have to do the welds first then bend it and it seems like it ...

I'm not saying the per cell charge current decreases, just saying the total pack charge current decreases. 4P at 10A is 2.5A/cell, so a 2P pack would only be able to do 5A total. Sure - but 5A at 72V, vs 10A at 36V, isn't it? = 360W. The actual voltage from the hub is something else, transformed by...

.... querkus wrote, In my experience adding more P cells works better than a longer serie. Reason for that is that internal resistance of cells is greater than properly sized nickel/copper between cells. My reply: if this is true, then my plan to go to higher voltage is doomed. Is this also why the...

The procedure doesn't look too hard to do. Which part do you not understand?

Basically you're just putting several different weights on the pedals and recording the weights and measured torque values to calibrate the sensitivity of your sensor.

It might help if you posted the github link you need translated.

I think you have an error in your voltage calculations. 42V for a 10S battery is 4.2V/cell. 54.6V for a 14S battery is 3.9V/cell. If you redo your math with the correct voltages, you'll find that the charge power is exactly the same no matter which way you configure the cells. Correct - thanks for ...

Do you have experimental data to support this ? In my experience adding more P cells works better than a longer serie Sure, but I think you're talking about something else. The original was, I think, about available regenerative braking force given a 10A charge limit. If you can put in only 10A at ...

Hi again. Pronghorn, that is a very interesting statement, and begs questions about definitions. You said: ... there is going to be a certain limit on the charge rate which limits the regen power. If you want more regen power, you need more cells. [/i] Is that true? The charge rate would be the cur...

For a given battery cell, there is going to be a certain limit on the charge rate which limits the regen power. If you want more regen power, you need more cells. Whether you arrange the cells in series for higher voltage or parallel for higher current doesn't matter from the battery's point of view...