I've realized, a bit late ( 48v 1000w hub, kit on order) that the proper battery (48v battery 20ah) is a little out of my reach right now...($450 shipped to my door, no additional fee's).
But I read a tip on here, that I could possibly downgrade my controller to a 20a one start with, and run a more attainable 48v /12 or 15ah battery.
Saving my other controller for a future upgrade. Any serious trade off's to doing this?
DownGrading a controller...
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- Posts: 90
- Joined: Mar 22 2015 3:04pm
- Location: Rochester, NY.
DownGrading a controller...
Me:..43yo, 5.5", 235lbs
Bike: 26" Giant Rincon. Base model, Mountain bike, bought new in 1996. No Shock. 22.5lbs stock
Ebike conversion: Rear hub 1000W 48v 30a controller. 48v 15AH Calibike battery with triangle bag. Road-bike rear tire that came with kit. 60psi f/r.
Upgrades: Shimano 13t Freewheel, replacing original 14t.
Accessories: Map my ride Phone app. Sunding basic bike computer.
Coming Soon.. Helmet, fnt/rr lights, rear rack, seat, new shifter's..
https://www.facebook.com/EbikingROC/
Bike: 26" Giant Rincon. Base model, Mountain bike, bought new in 1996. No Shock. 22.5lbs stock
Ebike conversion: Rear hub 1000W 48v 30a controller. 48v 15AH Calibike battery with triangle bag. Road-bike rear tire that came with kit. 60psi f/r.
Upgrades: Shimano 13t Freewheel, replacing original 14t.
Accessories: Map my ride Phone app. Sunding basic bike computer.
Coming Soon.. Helmet, fnt/rr lights, rear rack, seat, new shifter's..
https://www.facebook.com/EbikingROC/
Re: DownGrading a controller...
there may be way to limit the kit controller, with your wrist if no other way.
try it out with the batt. you can afford. New riders tend to over estimate how much range they will need on a daily basis.
try it out with the batt. you can afford. New riders tend to over estimate how much range they will need on a daily basis.
Motomech '11 Motobecane Fathom team, frt. mounted, recycled SWX02 from a Jump rental, 14S (52V nom.) Turnigy LiPoly, PSW Power 9-FET 20A controller. Mean Well HLG-320H-54A, Schwalbe Marathon's, 27 to 28 MPH.
Re: DownGrading a controller...
You could use a Cycle Analyst V2 or V3 or other current limiting device.
- dogman dan 100 GW
- Posts: 35843
- Joined: May 17 2008 12:53pm
- Location: Las Cruces New Mexico USA
Re: DownGrading a controller...
Likely your controller has more than one shunt inside. The shunts can be modified for more amps by adding a blob of solder.
Or, clipping one of multiple shunts would do the opposite. Cut it very close to the board, so that you could possibly solder it back if you want a more powerful bike again later.
If you have a 30 amps controller with 3 shunts, cutting one will make it a 20 amps.
But just buying a cheap 20 amps controller is not a bad option either. Should be possible to get one pretty cheap. The downside is the fun of finding the right wire combination to run it. If you find one with self learning capability, then it's easy. Usually not there on the very cheapest ebay controllers, but can be worth the cost.
Or, clipping one of multiple shunts would do the opposite. Cut it very close to the board, so that you could possibly solder it back if you want a more powerful bike again later.
If you have a 30 amps controller with 3 shunts, cutting one will make it a 20 amps.
But just buying a cheap 20 amps controller is not a bad option either. Should be possible to get one pretty cheap. The downside is the fun of finding the right wire combination to run it. If you find one with self learning capability, then it's easy. Usually not there on the very cheapest ebay controllers, but can be worth the cost.
Frankenbike longtail
http://endless-sphere.com/forums/viewto ... cing+betty.
bolt on longtail https://endless-sphere.com/forums/viewt ... =6&t=74584
The mixte long tail. https://endless-sphere.com/forums/viewt ... =6&t=74384
Beach cruiser converted to long tail. https://endless-sphere.com/forums/viewt ... r#p1045572
http://endless-sphere.com/forums/viewto ... cing+betty.
bolt on longtail https://endless-sphere.com/forums/viewt ... =6&t=74584
The mixte long tail. https://endless-sphere.com/forums/viewt ... =6&t=74384
Beach cruiser converted to long tail. https://endless-sphere.com/forums/viewt ... r#p1045572
-
- Posts: 90
- Joined: Mar 22 2015 3:04pm
- Location: Rochester, NY.
Re: DownGrading a controller...
Thanks people. 

Me:..43yo, 5.5", 235lbs
Bike: 26" Giant Rincon. Base model, Mountain bike, bought new in 1996. No Shock. 22.5lbs stock
Ebike conversion: Rear hub 1000W 48v 30a controller. 48v 15AH Calibike battery with triangle bag. Road-bike rear tire that came with kit. 60psi f/r.
Upgrades: Shimano 13t Freewheel, replacing original 14t.
Accessories: Map my ride Phone app. Sunding basic bike computer.
Coming Soon.. Helmet, fnt/rr lights, rear rack, seat, new shifter's..
https://www.facebook.com/EbikingROC/
Bike: 26" Giant Rincon. Base model, Mountain bike, bought new in 1996. No Shock. 22.5lbs stock
Ebike conversion: Rear hub 1000W 48v 30a controller. 48v 15AH Calibike battery with triangle bag. Road-bike rear tire that came with kit. 60psi f/r.
Upgrades: Shimano 13t Freewheel, replacing original 14t.
Accessories: Map my ride Phone app. Sunding basic bike computer.
Coming Soon.. Helmet, fnt/rr lights, rear rack, seat, new shifter's..
https://www.facebook.com/EbikingROC/
- DrkAngel 100 GW
- Posts: 5443
- Joined: Dec 15 2010 11:14am
- Location: Upstate-Western-Southern Tier NY. USA
Re: DownGrading a controller...
30A 3 shunt controller?
cut 2 shunts but reconnect both to switches (better - desolder one end of shunt and add switch in series)
Allows economy 10A
normal 20A and
turbo 30A
modes
Approximation of the HaiBike Drive
10A normal (350w) and 20A turbo (750w) mode

Demonstrates USA "legal" 20mph "motor only" w/assist till 30mph+
20A mode engaged via PAS sensor = "legal" 750w motor and 30mph with modest pedal assist
See - Currie Revolution
cut 2 shunts but reconnect both to switches (better - desolder one end of shunt and add switch in series)
Allows economy 10A
normal 20A and
turbo 30A
modes
Approximation of the HaiBike Drive
10A normal (350w) and 20A turbo (750w) mode
Demonstrates USA "legal" 20mph "motor only" w/assist till 30mph+
20A mode engaged via PAS sensor = "legal" 750w motor and 30mph with modest pedal assist
See - Currie Revolution
A little learning is a dangerous thing;
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.
I enjoy enlightening ... and enlivening the spirit of the innovators.
New & Improved - Acronym Definitions
Index - Homemade Battery Packs - Updated - December 2019
EBike Toolbox - Bargains! $
Endless Sphere Wiki - Lost?
Drink deep, or taste not the Pierian spring:
There, shallow draughts intoxicate the brain,
And drinking largely, sobers us again.
I enjoy enlightening ... and enlivening the spirit of the innovators.
New & Improved - Acronym Definitions
Index - Homemade Battery Packs - Updated - December 2019
EBike Toolbox - Bargains! $
Endless Sphere Wiki - Lost?