atm I configured the vesc like this (if there are some errors in the configuration let me know what’s wrong please):
Motor Current: 25A
Motor Brake: 30A
Battery Max: 60A
Battery Regen: 4A (following “1C rule”)
I’ll use a FlexiBMS Lite (max 10A) to charge the battery with a 25.2V 2A charger.
So, here are the questions:
Can someone help me finding the best fuse solution for main(if needed) and charge lines? For the last one I recently bought these, they are good?
At the moment I turn off my board with the anti-spark switch but I noticed that the electronics draw a little bit of current even when turned off, do I also need to implement the loop-key as shown here?
I’ve noticed some users maxing out the motor current and adjusting the max battery current as needed, is it better than my approach?
What about the batt regen -20A? Using a Lipo battery I have to charge at 1C (4A in this case) to prevent damage, what I’m missing about charging it 5x amps more?
You don’t have to, you can set it at anything you desire to. I’ve found this makes it a lot better. You won’t be running at your motor max setting very much if at all. Maybe for a second here and there, but definitely not long enough to heat your motor up too much. If your battery maximum was also set that high, then things would be a lot different.
Typically the high regenerative charge rates achieved by smashing the brakes at a high speed will be so ephemeral that they won’t upset the cells.
If sustained, a charge rate that high could definitely be an issue. But once you start braking hard, you immediately begin losing the momentum that would be needed to sustain such hard braking.
In addition, once your cells are discharged even a little bit, like even 99%, it makes this even less disruptive to them.
Sustained high charge rate could definitely be an issue for the Lipo battery. So I’m a little bit worried about ruining the battery. Anyway thank you, I’ll try higher values.
Ok, thank you. I’ll start testing with motor at 80A and battery at 25A later to rise to higher values if needed (where I live it snowed so I’ll have to wait some day).
Few days ago I ordered the Metr Pro module and I can’t wait to check volts/amps in rt while riding my e-longboard. Just to check how the energy is spread and at which rate to make sure I’m not stressing the devices out.
@Fosterqc@b264 could you please help me with this problem too?
What kind and rating of fuses do you recommend? Are fuses rated for 250V usable for this situation?
For main line I was thinking about this type rated for 100A(?) :
For charge line I was thinking about this two types rated for 10A :
Well, there have been long discussions on this topic, and both ways have pros and cons.
But me personally, I value my body more than my battery or ESC, so I feel this is safest for body. If something terrible is happening, I at least want to have a chance to hit the brakes before the battery goes nuclear, without a fuse popping and killing any chance I have to save myself.
If built and operated correctly, your current should not be going to levels above that anyway.