What controller?

[s7e]

Where can I find more info on the FOSS upgrade

https://www.google.com/search?q=site%3Aendless-sphere.com+kt+software+OR+firmware+OR+kunteng

I'll take a look thanks.

 

[s7e]

minimum of 72v... sine wave... minimum of 50a battery current

Kelly 7217S $175

The Grinfineon C7240 is 72V and 40A for $185. I'm sure you could modify it to produce up to 50A. This controller is very quiet and smooth with a direct drive motor.

Do you have experience with this controller? are they programable? If they're not what would the mod look like, a shunt mod?

 

[DogDipstick]

This is something i definitely want to avoid if it makes the hub noisy?

I never had a FOC or a Sinewave operating. That said: I wouldn't think noisy is so bad.. but you guys talk about a square wave or trap a "noisy" mess... I honestly think my KEB (trap) from Kelly is relatively quiet.. I mean loudest I hear is tires on road and the little hum / whine....

For a reference, E. Lyen has a bunch of vids of tests of his controllers so you can see exactly how loud they are...
https://www.youtube.com/channel/UCoRKSvPCtPai3iyEgWHszYQ


FOC or Sinewave must be absolutely silent for yall to consider a Square or Trapwave controller "loud". Ok I'll shut up now.

 

[amberwolf]

FOC or Sinewave must be absolutely silent for yall to consider a Square or Trapwave controller "loud".

They are, especially for the ones tunable to your motor.

 

[bww129]

The Grinfineon C7240 is 72V and 40A for $185. I'm sure you could modify it to produce up to 50A. This controller is very quiet and smooth with a direct drive motor.

Do you have experience with this controller? are they programable? If they're not what would the mod look like, a shunt mod?

I've been using one for about a month now and it meets its specifications. They are not programmable. If you want to increase the maximum current you would likely need to change the shunt value. I haven't seen any internal photos of the controller but do plan to open it up at some point to see what kind of build quality it has. It would also be nice to upgrade the battery and phase wires from 14AWG to 10-12AWG since I have spare wire laying around.

 

[amberwolf]

It would also be nice to upgrade the battery and phase wires from 14AWG to 10-12AWG since I have spare wire laying around.

It isn't already 12awg? I havent' actually checked the conductor size on my smaller ones (4835) from middle of last year, but am pretty sure they're 12awg on both battery and phase.

Would be odd if the lower power unit had bigger wires than the higher power unit.

 

[bww129]

The battery wires have these markings on them: CCC A005861 60227 IEC 02(RV) 450/750V. Seems to match what's listed here on Chau's Electrical Co. Ltd. product detail: http://www.chaus.com/product-detail-193.html

The battery wire insulation measures about 0.145in (3.68mm) diameter. I didn't keep the lengths of phase wires when they were shortened, but they have the same OD as the battery wires so it's probably safe to assume they're the same construction. There are 50 strands of 0.01in (0.254mm) diameter wire, which puts the cross sectional area at 2.5sq.mm. A metric/AWG conversion table lists this as 13AWG, so it's actually not 14AWG or 12AWG :lol:

The cross sectional area of 14AWG is typically 2.08sq.mm and 12AWG is 3.31sq.mm, so 12AWG would still be an upgrade for the C7240-GR controller. I do remember reading somewhere that 10AWG wire won't fit in the through holes on the circuit board, so 12AWG might be the limit.

Edit: It was in this thread about the older 7240-NC controller: https://endless-sphere.com/forums/viewtopic.php?t=86152