Shunt comparison pics

ebike11 · Aug 1, 2020

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.

E-HP · Aug 1, 2020

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 · Aug 1, 2020

E-HP said:
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?

E-HP · Aug 1, 2020

ebike11 said:
E-HP said:

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.

Click to expand...

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 · Aug 2, 2020

E-HP said:
ebike11 said:

E-HP said:

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.

Click to expand...

Oh I see. So the "bodies" of the shunt makes no difference?

Click to expand...

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?

E-HP · Aug 2, 2020

ebike11 said:
E-HP said:

ebike11 said:

E-HP said:

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.

Click to expand...

Oh I see. So the "bodies" of the shunt makes no difference?

Click to expand...

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.

Click to expand...

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 · Aug 2, 2020

E-HP said:
ebike11 said:

E-HP said:

ebike11 said:

Oh I see. So the "bodies" of the shunt makes no difference?

Click to expand...

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.

Click to expand...

Thanks for your advice!!
Im guessing then that under the rubber coating on the grin shunt is just 2 small pieces of metal?

Click to expand...

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!!

Shunt comparison pics

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