High Discharge BMS for 96V motor?

[furiousbob]

Hi!

Long time lurker, first post, second electric build. I'm more of a metal fabricator and electronics are not my strongest suit. I have a buddy of mine building 18650 packs for me but he's a bit tied up right now. Figured I'd try and find some answers on a BMS before I pull the trigger on the motor and controller.

I have an 86 Honda Elite CH150D that I'm planning on converting using a QS Motor 12KW 70H V3S motor on a 13x3.5" wheel. The motor will be ran at 96V although I'm debating switching it down to 72V since I already have an ebike conversion running at 72V. The scooter runs on 10" wheels but I'll be fabricating a custom swingarm to support the 13" wheel.

QS suggested I use the Kelly QSKLS96501-8080H controller. This controller is rated for 200A continuous and 500A peak discharge.

https://www.aliexpress.com/item/4001268004341.html?spm=2114.12010612.8148356.10.1563b46e1dN019

Is there a BMS that's able to support this? I've been searching and I haven't been able to find anything.

For what it's worth, I've also attached the data sheets they sent over.

 

[fatty]

Just a couple notes before you commit to a BMS:
The KLS96-8080H is good to 120V = 28s. Voltage that high will complicate/increase cost of the BMS, bulk charger, and not being evenly divisible by 6, can't be balance charged as easily.
The regular KLS84-H is good to 105V = 24s -- BMS and chargers are cheaper and more accessible, and being evenly divisible by 6, more easily balance charged.
The KLS-8080H are only IP54, whereas the regular KLS-H are IP66.

If you can get by on 9kW continuous / 27kW peak, you might try the KLS8430H first.

 

[flippy]

i would stick to 24S. and dont have the bms between the controller and battery. use a contactor that runs of 12v and only have the bms power the key/12V converter. that way the bms can still disconnect everything as normal but you dont have to spend stupid money on a overly complicated bms. https://www.aliexpress.com/item/4000529723243.html get the big boy version.

also: put a megafuse between the battery and the controller.

 

[furiousbob]

Thank you for your replies!

[strike]Maybe I need to get re-schooled here. I'm referring to the BMS that balances all the cells in the battery pack. Isn't the contactor basically a giant switch? Sort of like a high-amperage relay? Sorry, I'm completely new to contactors and I've never used one before.[/strike] I'm an idiot. I'll do more homework.

 

[mxlemming]

i would stick to 24S. and dont have the bms between the controller and battery. use a contactor that runs of 12v and only have the bms power the key/12V converter. that way the bms can still disconnect everything as normal but you dont have to spend stupid money on a overly complicated bms. https://www.aliexpress.com/item/4000529723243.html get the big boy version.

also: put a megafuse between the battery and the controller.

I've not previously seen this BMS, but it looks very good... What's the app?i cannot work out what app it uses. I'm probably bring a retard.

 

[flippy]

I've not previously seen this BMS, but it looks very good... What's the app?i cannot work out what app it uses. I'm probably bring a retard.

the QR code to download the app is litteraly stamped on the case of the bms. :wink:

 

[mxlemming]

I've not previously seen this BMS, but it looks very good... What's the app?i cannot work out what app it uses. I'm probably bring a retard.

the QR code to download the app is litteraly stamped on the case of the bms. :wink:

Aah yes. That's how the kids do it. I'm 33. To old for this

The qr was http://qr17.cn/BApbC0

Good trustworthy site :? Not on Google play... I've got a burner phone :lol:

 

[flippy]

Good trustworthy site :? Not on Google play... I've got a burner phone :lol:

none of these apps are on google play, or the apple store for that matter.

 

[j bjork]

https://nl.aliexpress.com/item/32826469363.html?spm=a2g0z.12010612.8148356.1.7b451d155aglY7

I think you can set up to 600A discharge for short bursts.

 

[flippy]

https://nl.aliexpress.com/item/32826469363.html?spm=a2g0z.12010612.8148356.1.7b451d155aglY7

I think you can set up to 600A discharge for short bursts.

those will explode at those currents. you need to completly overhaul the mosfet board with new mosfets wich is a hell of a lot more complex and unnessary then just running a contactor.

 

[j bjork]

Maybe, but I dont see why you cant bypass this bms with a contactor the same way as the one you suggested.
And this one can do up to 32s.

 

[flippy]

Maybe, but I dont see why you cant bypass this bms with a contactor the same way as the one you suggested.
And this one can do up to 32s.

because the bms i recommend has active balancing and is built considerably better.