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Old 03-10-2015, 04:41 PM   #11
JohnnieB
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Default Re: Voltage reducer, 36 -> 18 volts

With the use of steering diodes, batteries can be charged in parallel and used in series or vice versa.

The attached drawing (albeit crude) shows how to do it.
Basically you have two electrically isolated circuits.

The existing 36V circuit remains as is. The 18V circuit is all added stuff.

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Because of the voltage drop across the diodes, the voltage output of the 18V circuit will be less than half of the 36V circuit, but it should operate the lift motor a lot better than 12V and won't imbalance the pack.
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Old 03-10-2015, 05:36 PM   #12
jdunmyer
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Default Re: Voltage reducer, 36 -> 18 volts

JohnnieB,
Once again, I stand in awe. If I can't find suitable diodes in my pile of junk, er, Stuff, I'll just buy 'em.

Thanks so much!!

<<Jim>>
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Old 03-10-2015, 05:51 PM   #13
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Default Re: Voltage reducer, 36 -> 18 volts

I am sorry, but that circuit will not do what You want.

Look carefully, starting from the left side as being diode (D1) going to the right (D4).

Current will flow out of D1 back into D3, so the voltage at B+ & B- will be 36v minus the voltage drop in 2 diodes.

You would need to isolate the 2 - 18v banks by removing the bottom dotted line for it to work, at that point, the diodes would serve no purpose.
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Old 03-11-2015, 05:41 AM   #14
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Default Re: Voltage reducer, 36 -> 18 volts

Quote:
Originally Posted by Sergio View Post
I am sorry, but that circuit will not do what You want.

Look carefully, starting from the left side as being diode (D1) going to the right (D4).

Current will flow out of D1 back into D3, so the voltage at B+ & B- will be 36v minus the voltage drop in 2 diodes.

You would need to isolate the 2 - 18v banks by removing the bottom dotted line for it to work, at that point, the diodes would serve no purpose.
You are right. That circuit won't work.

Thank you for catching my error.
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Old 03-11-2015, 06:39 AM   #15
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Default Re: Voltage reducer, 36 -> 18 volts

If it were my tractor, I would look at speed controllers for electric bicycle kits. Then you could use the full pack regulated by the controller, and have speed control of the lift.
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Old 03-11-2015, 09:09 AM   #16
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Default Re: Voltage reducer, 36 -> 18 volts

Revolution,
That's an idea, thanks for the thought!

Smallish electric scooters and handicap carts often show up at the scrapyard, so I'll keep my eyes open. As far as that goes, perhaps a regular golf cart controller might work. There haven't been any carts at the yard recently, but in the past, I've harvested controllers, pot boxes, key switches, cables, solenoids, and more. All of the electrics in my old CC came from there.
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Old 03-11-2015, 10:10 AM   #17
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Default Re: Voltage reducer, 36 -> 18 volts

http://www.monsterscooterparts.com/36vocove1.html

This one new is less than $50. If you hunt around a bit you can get them for less than $20.
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Old 03-11-2015, 01:05 PM   #18
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Default Re: Voltage reducer, 36 -> 18 volts

Revolution,
That is certainly attractive and looks like it'll work. I think my only question is if it has some sort of zero throttle interlock like many GC controllers. Obviously, I want to set the speed/output voltage with a pot and be done with it. Will drop an email on them...

Thanks for the tip!
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Old 03-11-2015, 01:41 PM   #19
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Default Re: Voltage reducer, 36 -> 18 volts

They all have an interlock, and the typical 3 wire e-bike throttle is a Hal sensor. You may need to play with a voltage divider circuit to get the right signal to the throttle.

You also need to make sure it is not a "learning" or "self calibrating" throttle type controller.
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