I have an electric bike shop and have customers who want to modify their controllers. I am looking for someone who does this kind of work. I am willing to pay the costs. 48v 500 watts system controllers is what we are using.
(moderator edit: moved to Items Wanted where it is more likely to be seen by those looking to help)
Shunt Mods
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Shunt Mods
by ronelliott » Sat Dec 03, 2011 1:44 pm
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Re: Shunt Mods
by tjason » Sat Dec 03, 2011 6:51 pm
Howdy!
Changing out the FETs or "soldering up" a shunt to improve current flow works, but. After doing this the calibration is off. The controller no longer can prevent the user from damaging itself or something else because it doesn't actually know what is going on. Your customers would be better off buying a replacement controller with good FETs and more of them. With a supplier like Lyen, Methods or Ebikes.ca It's much easier to do by purchasing the correct size controller for their needs. Sell the old controllers here on the forum.
Just my 2 cents.
TJ
Changing out the FETs or "soldering up" a shunt to improve current flow works, but. After doing this the calibration is off. The controller no longer can prevent the user from damaging itself or something else because it doesn't actually know what is going on. Your customers would be better off buying a replacement controller with good FETs and more of them. With a supplier like Lyen, Methods or Ebikes.ca It's much easier to do by purchasing the correct size controller for their needs. Sell the old controllers here on the forum.
Just my 2 cents.
TJ
Giant iguana CrMo steel w/ springer fork, Crystalyte HT3525, Headway 12ahr cells 16s, Lyens sensored mini monster 6FET. Laptop battery charger. Under permanent construction...
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Re: Shunt Mods
by neptronix » Sat Dec 03, 2011 6:59 pm
Hm. Putting a dab of solder on a shunt is too hard for you? 
ES facebook group: http://facebook.com/#!/home.php?sk=group_125035107565566&ap=1
The all-arounder: 8T MAC motor on a Trek 4500.
The girlfriend bike: 350W front MAC on a 700c Trek.
The wheelie machine: 20" Rear Magic Pie II on a Trek 4300 MTB
The Bus: ??? on a 'da bomb' cargo bike frame
Pro-tips for noobs: Avoid BMS Battery like the plague | Charge RC Lipos to 4.15v, stop discharging at 3.5-3.6v | Use torque plates/arms! | Rear mounted hubs are always best
The all-arounder: 8T MAC motor on a Trek 4500.
The girlfriend bike: 350W front MAC on a 700c Trek.
The wheelie machine: 20" Rear Magic Pie II on a Trek 4300 MTB
The Bus: ??? on a 'da bomb' cargo bike frame
Pro-tips for noobs: Avoid BMS Battery like the plague | Charge RC Lipos to 4.15v, stop discharging at 3.5-3.6v | Use torque plates/arms! | Rear mounted hubs are always best
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neptronix - 100 GW
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Re: Shunt Mods
by ronelliott » Mon Dec 05, 2011 12:00 pm
If I new where and how to do it -it would be easy. Like anything else its easy once you learn how!
- ronelliott
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Re: Shunt Mods
by neptronix » Mon Dec 05, 2011 4:14 pm
Look for this component and start adding solder to it
Make sure of course, to not overamp the controller as to create excessive heat and destroy the controller..
ES facebook group: http://facebook.com/#!/home.php?sk=group_125035107565566&ap=1
The all-arounder: 8T MAC motor on a Trek 4500.
The girlfriend bike: 350W front MAC on a 700c Trek.
The wheelie machine: 20" Rear Magic Pie II on a Trek 4300 MTB
The Bus: ??? on a 'da bomb' cargo bike frame
Pro-tips for noobs: Avoid BMS Battery like the plague | Charge RC Lipos to 4.15v, stop discharging at 3.5-3.6v | Use torque plates/arms! | Rear mounted hubs are always best
The all-arounder: 8T MAC motor on a Trek 4500.
The girlfriend bike: 350W front MAC on a 700c Trek.
The wheelie machine: 20" Rear Magic Pie II on a Trek 4300 MTB
The Bus: ??? on a 'da bomb' cargo bike frame
Pro-tips for noobs: Avoid BMS Battery like the plague | Charge RC Lipos to 4.15v, stop discharging at 3.5-3.6v | Use torque plates/arms! | Rear mounted hubs are always best
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neptronix - 100 GW
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- Joined: Tue Jun 15, 2010 5:56 pm
- Location: Salt Lake City, Utah
Re: Shunt Mods
by John in CR » Wed Dec 07, 2011 5:58 am
That's no way to do it....too imprecise. I posted a thread in technical about how to do this in a controlled manner by wrapping a portion of the shunt length with copper to effectively reduce it's resistance by that percentage. BigMoose even posted a method by which to make tunable and reversible changes to current limits without programming.
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Re: Shunt Mods
by Kin » Sat Dec 10, 2011 12:06 pm
To clarify, because I think it was pretty cool, the general principle of John's mod was that the percentage of the shunt wrapped in copper would have almost no resistance. So if the shunt is wrapped 50% in copper, resistance is down 50%, amps are double [Half that if there are two shunts and you only cover one 50% that's 25% of the total]. I believe this is the general principle, and it's supposed to be somewhat more accurate. please correct me if I'm wrong.
New to endless-sphere? Notice a lot of signatures recommending Ebike.ca? That's because it's the best place for a quality and manageable, (but still 'real'), first build. Justin is a solid supporter of electric bike development, and a good source of equipment.
My hat off a thousand times to the green people that effectively run this forum. The ES Mods are superb.
My hat off a thousand times to the green people that effectively run this forum. The ES Mods are superb.
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