How many amps safely need the esc or bms to do

[Hummina Shadeeba]

With spikes starting, hills, and also thinking the hub motor that Jacob is making and I'm getting two of needing extra torque/amps maybe, what's the min amp discharge cutoff will a bms need for an 8s esc? I'm trying to find one and from what I've seen at 8s theyll maybe do only 60 amps.
Also with different chemistries or lipo how important is it to keep to the volt limit on the esc? If you were to charge even lipo to 4.2 would you be at risk of shorting the esc or is the volt limit really about keeping the amp draw down?

Torque -those two 8s esc you sold me ages ago..what amps can they do I forget ?

 

[torqueboards]

You have 8S 120Amp Single/Dual ESCs.

BMS is for both low voltage and over voltage limits to protect the battery. If you can 4.10v is better than 4.20v for longevity.

BMS also has low/high amp limits to protect cells.

Use higher voltage to compensate for lower amp draw.

How's your current hub motor setup? Does it still work?

You can choose a BMS to cut off to which ever. Just know it will limit your power. Just do the calculations to verify and/or throw an amp logger on your setup to see what you use.

 

[Hummina Shadeeba]

You have 8S 120Amp Single/Dual ESCs.

BMS is for both low voltage and over voltage limits to protect the battery. If you can 4.10v is better than 4.20v for longevity.

BMS also has low/high amp limits to protect cells.

Use higher voltage to compensate for lower amp draw.

How's your current hub motor setup? Does it still work?

You can choose a BMS to cut off to which ever. Just know it will limit your power. Just do the calculations to verify and/or throw an amp logger on your setup to see what you use.

With (2) 8s 120amp esc I'll use I imagine the amp need will be split. Do you think 60 or even 50 max amp draw will be adequate? I hear people will hit 2000 watts sometime when starting and the motor is orienting itself. My amp logger sits waiting for 2 of jacobs hub motors and I haven't used it yet. My homemade 1:1 rubs when I go to the right and gets hot and it sits under my bed. Bad design but I had to try it. Should've simply cut up the wheel and put it in. At least simpler than what I was doing
Am I wrong that with a bms I can simply have a plug port for a power cord that'll rectify and do 30v and an amp draw dependent on the batteries c rating and size (and the bms set limit)? Anyone here have a good thread on integrating a bms, switch (I like and will prob get yours), and charge port? I've gotten nowhere looking as its all above me still and need a simpler explanation and a good source. I thought u were selling a bms but don't see it on your site

 

[torqueboards]

Yeah, I've delayed actually selling it because it's best to only ship with UPS/Fedex vs USPS. But Fedex/UPS prices for shipping are ridiculous for international.

I'm working on a 7S 11ah though which I should have soon. I'd prefer 10S 11ah but it's much more space. I'll do that one afterwards.

Try 97mm wheels on your setup or 107mm ABEC? 60 amp should be fine. For the most part we don't use that much.

Look at Austin's thread for amp draw and/or Ben Vedder ESC thread to watch his video on amp draw.

We don't draw as much amps as most people think for normal riding. An RC car goes from 0 to 60 to reverse pretty much instantly. You can't do that on our boards without falling off.

Voodoojar's boards are only 20amp max draw on his packs which are more then enough to reach 22mph.

IMO High voltage is the way to go for more power, speed and torque which is why I'm reaching for the 10S. Only downside is the weight + space it takes up.

 

[Hummina Shadeeba]

Maybe less weight with the thinner wires for same watt hours w higher volts I'd have thought but I've got those two esc u gave me already and definately powerful enough

I don't know why i wrote what I did before, with two motors I'll hit the same amp draw not be cutting in half w the bms

I used the 85mm Abec on my under-the-bed board. Think that's the size. Confused w the duro maybe.

Ok I'll go for the 60amp Bms. I guess I won't worry about amp spikes and it shutting down. Or maybe it won't shut down and instead keeps spikes down, I don't know but until I hear otherwise 60amp it is
I'm on the hunt for the switch and charging port still then. Think enertion might have them. Nice to have options though

Sounds like an esc doesn't need such huge amp ability either then.