DownGrading a controller...

General Discussion about electric bicycles.
Post Reply
SnowDog2112
10 W
10 W
Posts: 91
Joined: Mar 22, 2015 3:04 pm
Location: Rochester, NY.

DownGrading a controller...

Post by SnowDog2112 » Mar 26, 2015 7:32 am

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?
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/

User avatar
motomech
100 MW
100 MW
Posts: 2910
Joined: Sep 11, 2010 12:21 am
Location: Tucson Az.

Re: DownGrading a controller...

Post by motomech » Mar 26, 2015 7:55 am

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.
Motomech

'03 Rocky Mountain Edge 2WD 260 Q100H frt and Ezee V1 rear 2 Elifebike 20A & 25A 9-FET controllers 12S/20Ah Multistar Lipo rear 5Ah Turnigy frt Luna Cyclops Extra lite Alex 24DM rims, 2.4 Holly Rollers run ghetto tubeless. 25 mph. Mean Well HLG-320H-48A
https://endless-sphere.com/forums/viewt ... =3&t=83430
'07 GT Idive 4 4.0, Q100C 201 12S LiPoly elifebike 9-FET 17A controller. 20 MPH.
https://endless-sphere.com/forums/viewt ... 8#p1237928

JoyRiddin
10 mW
10 mW
Posts: 31
Joined: Apr 04, 2011 10:42 am

Re: DownGrading a controller...

Post by JoyRiddin » Mar 26, 2015 8:04 am

You could use a Cycle Analyst V2 or V3 or other current limiting device.

User avatar
dogman dan
100 GW
100 GW
Posts: 34446
Joined: May 17, 2008 12:53 pm
Location: Las Cruces New Mexico USA

Re: DownGrading a controller...

Post by dogman dan » Mar 26, 2015 9:09 am

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.

SnowDog2112
10 W
10 W
Posts: 91
Joined: Mar 22, 2015 3:04 pm
Location: Rochester, NY.

Re: DownGrading a controller...

Post by SnowDog2112 » Mar 26, 2015 12:27 pm

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/

User avatar
DrkAngel
10 GW
10 GW
Posts: 4516
Joined: Dec 15, 2010 11:14 am
Location: Upstate-Western-Southern Tier NY. USA

Re: DownGrading a controller...

Post by DrkAngel » Mar 28, 2015 4:42 am

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
Image

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 - November 2015

EBike Toolbox - Bargains! $

Endless Sphere Wiki

Post Reply