Crystalyte controller 36 or 72V battery

rogerax

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Linköping
Hi,

I wanna go 50 km/h with my bike. Travel distance 20km. The plan is to buy a crystalyte HS3540 and Infineon controller 36-72V, 40A regen and a Cycle Analyst, from Crystalyte Europe. A little expensive, but I believe running “high power” controller at a little bit lower current would be a robust solution?


Regarding battery, I see to alternatives. I have one almost new 36V/10Ah Li ion battery.


1. Buy one more 36V/10Ah battery (same brand), connect in series and run 72V/10Ah.
2. Buy one more 36V/10Ah battery (same brand), connect in series and run 36V/20Ah (topspeed reduced to 40km/h, I believe)
3. Buy a new 48V/15 AH.



Since I can buy the 36V/10Ah battery locally in Sweden, that will be cheaper than buy a new 48V/15 Ah. To be able to go the distance I want, top speed and maximum current must be reduced in the controller with the Cycle Analyst, at least in the 72V case.


Which solution is to recommend, pros and cons?

/ Roger
 
Hmm, I'd say the first thing is ditch the 40 amps controller, unless you plan on a future battery that can handle it.

IMO, that controller will need a completely new battery, and it would have to be higher c rate than a typical 10 ah 36v ebike pack. So you'd need 3 new batteries of that type to run that controller without murdering your batteries.

Or as you say, start from scratch, but with a higher c rate battery such as headway, A123, or RC lipo. You'd definitely have your performance with 72v 10 ah of 20 or 30 c lipo. But you'd have the extra vigilance required to safely charge and store the more volatile lipo battery.

However, a 72v 20 amps controller should get you to 50 kph. Or limit amps with the CA. A smaller controller should be cheaper than a big one limited by CA. It would still be a bit of a push for those batteries, but 72v 10 ah would be only using 2c discharge rate to get 20 amps.

C rate is how you measure the discharge ability of a battery. Very likely what you have now is 2c, so 10 ah can do 20 amps max. And idealy, you'd not max it for more than a few seconds at a time. RC lipo with 30c, could handle your proposed controller with ease. It's what I run with my 40 amp controllers for high performance riding on dirt trails or racetrack.

If you bought 48v 15 ah of a 2c battery, you'd still need to limit to 30 amps, or preferably even 25 amps. Likely you'll like 72v best, even if you limit it to 20 amps.
 
Ok, dogman. Thanks for the info. I'm sure you're right. Ebikes.ca have a Infineon controller 36-72V, 25A regen. Cheaper, smaller but propably still good for 50kph. Seems good to me. I think I would like a CA to get a overview of the system and limiting current etc.

The battery I have now is 10s LiPo 36V 10Ah. (AE7288195PMHRE). Cant find any c rate of this, so dont know if buying one more and connect in series, would do the job.

http://www.rpc.com.tw/en/polyme_d.asp

R
 
That link goes to many batteries. Do you know the c rate of yours? I see that they do sell some with higher discharge rates. If yours is 10c or more, then go for the 40 amps.

2-3c is more typical of batteries intended for ebikes, since most ebikes have 15-20 amps controllers.

Typical ES kook thinks 20c is weak though. :twisted:
 
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