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General Category => Magic Pie & Smart Pie Discussions => Topic started by: Aavee on May 31, 2010, 06:00:24 PM

Title: does it go like this? two batteries, two ways of connecting => two options
Post by: Aavee on May 31, 2010, 06:00:24 PM

hi guys,
since I do not understand basically anything concerning electrics or electronics I'd like to place a question for you experts.

Hopefully soon coming MP II (or maybe also all GM ?) hubs can use 72V.

My first question is: Is this correct? => If I take two 36V batteries and 'connect' them together - and there is these two different ways of connecting ( I do not know correct english terms for them, parallel (?) and xxx) - does it mean that I could have
1) 36V, slower speed and more time for driving or 2) 72V, faster speed and shorter time for driving.

second question is: naturally you experts have figured this out (if this can be done), how did you solve this? How do you change the mode between distance and speed..?

Thanks for the comments.

Title: Re: does it go like this? two batteries, two ways of connecting => two options
Post by: Hardcore on May 31, 2010, 07:48:22 PM

I think there has been a thread about parallel and series switching, just use search and make wonders. But you can do that, but gm controllers are limited to 63v. That means it doesn't work on 72 V what means you need to get a different controller or wait for the newer one. But I have seen 72v on gm hubs.

Title: Re: does it go like this? two batteries, two ways of connecting => two options
Post by: Aavee on May 31, 2010, 08:15:08 PM

Quote from: hardcore on May 31, 2010, 07:48:22 PM

you need to get a different controller or wait for the newer one. But I have seen 72v on gm hubs.

Just to confirm - new MP II is going to be able to use 72V, right?

Title: Re: does it go like this? two batteries, two ways of connecting => two options
Post by: Leslie on May 31, 2010, 09:29:23 PM

Yes it can be done.

Two 36v batteries or three 24v batteries make 72v.

Title: Re: does it go like this? two batteries, two ways of connecting => two options
Post by: Leslie on May 31, 2010, 09:31:18 PM

Quote from: Aavee on May 31, 2010, 08:15:08 PM

Just to confirm - new MP II is going to be able to use 72V, right?

Not sure after the latest announcents.
  

Title: Re: Series Parallel switching
Post by: Bikemad on June 01, 2010, 12:10:46 AM

Check out this post (http://goldenmotor.com/SMF/index.php?topic=2095.msg11157#msg11157) for further details.

Title: Re: does it go like this? two batteries, two ways of connecting => two options
Post by: Leslie on June 01, 2010, 11:15:46 AM

But if he does this switch will it overvolt the MP2 controller?

Title: Re: Series Parallel switching
Post by: Aavee on June 01, 2010, 07:08:21 PM

Quote from: Bikemad on June 01, 2010, 12:10:46 AM

Check out this post (http://goldenmotor.com/SMF/index.php?topic=2095.msg11157#msg11157) for further details.

Thanks Bikemad,
I checked and I think I am wiser ;-)

Title: Re: does it go like this? two batteries, two ways of connecting => two options
Post by: Aavee on June 01, 2010, 07:16:24 PM

Quote from: 317537 on June 01, 2010, 11:15:46 AM

But if he does this switch will it overvolt the MP2 controller?

When you get to know or learn something about this I would appreciate if you let us know,
thanks!