72 to 52V DC DC converter - Do they exist?

General Discussion about electric vehicles.
Post Reply
skyeg3   1 W

1 W
Posts: 55
Joined: Nov 20 2015 3:00am

72 to 52V DC DC converter - Do they exist?

Post by skyeg3 » Nov 04 2019 11:58pm

Hey All, So I built an electric quad using the motor and controller from a 2010 Zero motorcycle. The motor is a perm 132 and the controller is an alltrax that can take 52V. Thing is I spent $1200 on 72V batteries already because I thought I would be using a different controller. My question: Can I buy a voltage reducer? Would be sweet not to just waste them and buy new batteries. Is this advisable?

billvon   1 GW

1 GW
Posts: 3051
Joined: Sep 16 2007 9:53pm
Location: san diego

Re: 72 to 52V DC DC converter - Do they exist?

Post by billvon » Nov 05 2019 12:06am

skyeg3 wrote:
Nov 04 2019 11:58pm
Hey All, So I built an electric quad using the motor and controller from a 2010 Zero motorcycle. The motor is a perm 132 and the controller is an alltrax that can take 52V. Thing is I spent $1200 on 72V batteries already because I thought I would be using a different controller. My question: Can I buy a voltage reducer? Would be sweet not to just waste them and buy new batteries. Is this advisable?
It's doable. You will probably end up designing something yourself, and you will lose efficiency tho.
--bill von

User avatar
amberwolf   100 GW

100 GW
Posts: 29825
Joined: Aug 17 2009 6:43am
Location: Phoenix, AZ, USA, Earth, Sol, Local Bubble, Orion Arm, Milky Way, Local Group
Contact:

Re: 72 to 52V DC DC converter - Do they exist?

Post by amberwolf » Nov 05 2019 1:22am

Almost certainly going to be cheaper and/or more reliable / efficient to buy a controller that can operate on the voltage range your batteries produce.

john61ct   100 GW

100 GW
Posts: 5013
Joined: Dec 18 2018 2:06pm

Re: 72 to 52V DC DC converter - Do they exist?

Post by john61ct » Nov 05 2019 9:34am

At low amps cheap chinese may be affordable.

At high amps gets crazy pricey.

And IRL conversion efficiency, might get 85% at best.

User avatar
fechter   100 GW

100 GW
Posts: 14716
Joined: Dec 31 2006 3:23pm
Location: California Bay Area, USA

Re: 72 to 52V DC DC converter - Do they exist?

Post by fechter » Nov 05 2019 10:36am

I would look for a new controller that handles 72v. Kelly or Alltrax will have something. There are others out there. You may need to limit the throttle to keep the motor happy at the higher voltage.
"One test is worth a thousand opinions"

skyeg3   1 W

1 W
Posts: 55
Joined: Nov 20 2015 3:00am

Re: 72 to 52V DC DC converter - Do they exist?

Post by skyeg3 » Nov 06 2019 12:33am

After thinking about it more I think the 72V controller is the way to go. Thanks

Post Reply