Shunt comparison pics

General Discussion about electric bicycles.
Post Reply
ebike11   100 kW

100 kW
Posts: 1427
Joined: Nov 16 2013 8:01pm
Location: far away

Shunt comparison pics

Post by ebike11 » Aug 01 2020 12:18pm

Hi guys..i know it may not be a big deal. Plan on removing my grin shunt for one that can handle more power.
First ordered a 150A then thought to go for a 200A.
They are cheap so not expecting anything fancy but its weird that the 150A one is so much bigger and heavier.
Attachments
20200725_083344-1-1.jpg
20200725_083344-1-1.jpg (362.4 KiB) Viewed 86 times
20200725_083418-1.jpg
20200725_083418-1.jpg (360.56 KiB) Viewed 86 times
20200725_083422-1.jpg
20200725_083422-1.jpg (437.06 KiB) Viewed 86 times
20200725_083549-1.jpg
20200725_083549-1.jpg (270.24 KiB) Viewed 86 times
20200725_083330-1.jpg
20200725_083330-1.jpg (314.66 KiB) Viewed 86 times

User avatar
E-HP   100 kW

100 kW
Posts: 1309
Joined: Nov 01 2018 9:20pm

Re: Shunt comparison pics

Post by E-HP » Aug 01 2020 12:39pm

The shunt(s) are the black part(s) in you pics. Looking at your second and third pics, the 200A shunts are wider than the 150A, in order to pass more current.

ebike11   100 kW

100 kW
Posts: 1427
Joined: Nov 16 2013 8:01pm
Location: far away

Re: Shunt comparison pics

Post by ebike11 » Aug 01 2020 1:04pm

E-HP wrote:
Aug 01 2020 12:39pm
The shunt(s) are the black part(s) in you pics. Looking at your second and third pics, the 200A shunts are wider than the 150A, in order to pass more current.
Oh I see. So the "bodies" of the shunt makes no difference?

User avatar
E-HP   100 kW

100 kW
Posts: 1309
Joined: Nov 01 2018 9:20pm

Re: Shunt comparison pics

Post by E-HP » Aug 01 2020 1:15pm

ebike11 wrote:
Aug 01 2020 1:04pm
E-HP wrote:
Aug 01 2020 12:39pm
The shunt(s) are the black part(s) in you pics. Looking at your second and third pics, the 200A shunts are wider than the 150A, in order to pass more current.
Oh I see. So the "bodies" of the shunt makes no difference?
Pretty much. The additional contribution to the resistance from the lug sections should be minimal, when comparing the large cross sectional area of the chunky body parts relative to the very small cross section of the thin shunts.

ebike11   100 kW

100 kW
Posts: 1427
Joined: Nov 16 2013 8:01pm
Location: far away

Re: Shunt comparison pics

Post by ebike11 » Aug 02 2020 4:23pm

E-HP wrote:
Aug 01 2020 1:15pm
ebike11 wrote:
Aug 01 2020 1:04pm
E-HP wrote:
Aug 01 2020 12:39pm
The shunt(s) are the black part(s) in you pics. Looking at your second and third pics, the 200A shunts are wider than the 150A, in order to pass more current.
Oh I see. So the "bodies" of the shunt makes no difference?
Pretty much. The additional contribution to the resistance from the lug sections should be minimal, when comparing the large cross sectional area of the chunky body parts relative to the very small cross section of the thin shunts.
Thanks for your advice!!
Im guessing then that under the rubber coating on the grin shunt is just 2 small pieces of metal?

User avatar
E-HP   100 kW

100 kW
Posts: 1309
Joined: Nov 01 2018 9:20pm

Re: Shunt comparison pics

Post by E-HP » Aug 02 2020 4:59pm

ebike11 wrote:
Aug 02 2020 4:23pm
E-HP wrote:
Aug 01 2020 1:15pm
ebike11 wrote:
Aug 01 2020 1:04pm
E-HP wrote:
Aug 01 2020 12:39pm
The shunt(s) are the black part(s) in you pics. Looking at your second and third pics, the 200A shunts are wider than the 150A, in order to pass more current.
Oh I see. So the "bodies" of the shunt makes no difference?
Pretty much. The additional contribution to the resistance from the lug sections should be minimal, when comparing the large cross sectional area of the chunky body parts relative to the very small cross section of the thin shunts.
Thanks for your advice!!
Im guessing then that under the rubber coating on the grin shunt is just 2 small pieces of metal?
Could be any number. The metal is a specific alloy, and just needs to be sized/calibrated to have a known voltage drop with a known current, within an operating range (and temperature).

ebike11   100 kW

100 kW
Posts: 1427
Joined: Nov 16 2013 8:01pm
Location: far away

Re: Shunt comparison pics

Post by ebike11 » Aug 02 2020 7:07pm

E-HP wrote:
Aug 02 2020 4:59pm
ebike11 wrote:
Aug 02 2020 4:23pm
E-HP wrote:
Aug 01 2020 1:15pm
ebike11 wrote:
Aug 01 2020 1:04pm


Oh I see. So the "bodies" of the shunt makes no difference?
Pretty much. The additional contribution to the resistance from the lug sections should be minimal, when comparing the large cross sectional area of the chunky body parts relative to the very small cross section of the thin shunts.
Thanks for your advice!!
Im guessing then that under the rubber coating on the grin shunt is just 2 small pieces of metal?
Could be any number. The metal is a specific alloy, and just needs to be sized/calibrated to have a known voltage drop with a known current, within an operating range (and temperature).
I see thanks!!

Post Reply