48 volts in a 36 volt DC system

5 replies [Last post]
mark IV
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Joined: 07/18/2007
Points: 10

My 36volt Heinzmann system works great, and has for many years, I was wondering if I have to change the controler (which i can for $80) to attach a 48 volt power source. I've read that upping the power from 36-48 is doable in a brushed DC motor, which would make this motor just fly. I also don't want it to burn-up right away either, but the system is overbuilt as it is, and only gets warm after 3 hrs of constant use, never hot to the touch.

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Systems so far:
36 volt Heinzmann, ~8yrs old
36 volt Bionx, new

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E-bike platforms so far:
36 v geared Hienzmann frnt wheel dr (6yrs old)
36 V 350-watt Bionx-li-on hybrid bike (new)

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reikiman
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Joined: 11/19/2006
Points: 8454
Re: 48 volts in a 36 volt DC system

To be safe you should, but it might "just work". Electrical components always are rated for e.g. ## volts at ## amps, so the components in your controller might be rated to carry 45 volts and would blow at 48 volts. But maybe they're rated for 60 volts and can handle either. You might be able to tell by opening the controller and hopefully part numbers will be printed on the FETs.

- David Herron, http://davidherron.com/

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Ian
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Joined: 07/21/2007
Points: 77
Re: 48 volts in a 36 volt DC system

If this is any use - I have the 24v model with heinzmann hub and been running at 36v no problem for a year now. the 36v motors can definitely be run at 48v and higher. I tried to run mine at 48v once but nothing worked and no damage was done.

mark IV
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Joined: 07/18/2007
Points: 10
Re: 48 volts in a 36 volt DC system

Wow that would be awsome if i could. I've had the cover off before to change batteries, after about 4 years they stopped holding a charge. But I'm not sure what "Fets" are but my controler is rated at 35 amps and looks like it will operate for years more. I was thinking about removing the cover of the motor and regreasing the idler gear but seems to work exactly the same as the day i got it. I think i'm going to order a 48 volt NMH batteries and charger, 10 more volts DC seems not too aggressive I hope. The Heinzmann controller has a lot of heat and other protection circuits built in so I'm not surprised the 24 volt system couldn't handle the 48 volts. But happy to hear it didn't fry your board.

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E-bike platforms so far:
36 v geared Hienzmann frnt dr (8yrs old)
36 V 350-watt Bionx-li-on hybrid bike (new)

__________________

E-bike platforms so far:
36 v geared Hienzmann frnt wheel dr (6yrs old)
36 V 350-watt Bionx-li-on hybrid bike (new)

jackdullboy
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Joined: 04/21/2008
Points: 9
Re: 48 volts in a 36 volt DC system

Hi all,
I have been a member for a while but this is the first time I found this (thread, forum,? ) I am not sure what to call it. I have a BD 36 and from many reports people have had no problem going to 48 volts to increase speed.
As the dummy I am, when I was trying to fix my throttle (hall effect) I blew my original controller. I am going to place a link to the controller that I now have. I guess what I am asking is would one of you, take a look at the specs and let me know if it is like the original controller (listed a 36, but able to handle 48 just fine). This would be most helpful because if I can just keep the controller I have, and add another 12v battery, obviously I could save $$. Here is the link which gives the specs. http://www.tncscooters.com/YK42-3.php.
Anyone who would take the time to help me I can assure you that your time will not go unappreciated.

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Spaceangel
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Joined: 07/15/2009
Points: 466
Re: 48 volts in a 36 volt DC system

I had a small scooter with Brushed type DC motor and eventually the controller gave out. So I used a Curtis 1205 and used it. I had to change throttle assembly to 0 - 5 K pot and it lasted for ever. Using a Golf Cart controller is better for it has stronger Flyback diodes, recovery diodes and better FET transistors. At medium speed is where you get a lot of recovery. One can have 30 to 40 amperes from battery and have 80 Amps easy on motor shunt. But on AC system it uses Variable Frequency Drives to run 3 phase brushless motors. DC motor speed controllers are basic light dimmers with diodes for Counter EMF to run motor. id est pulse width modulators.
On most motor circuits you can up the voltage a good 20 to 40 percent.
The largest I went is 96 volt Prestolite motor and ran it on 144 volts for 9 years. That is a 50% increase.
DCP 600 Amp controller.
Rusty

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Rusty

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