72V DC battery wanted

[GuileSN]

Hi there,

I am new to this forum. I am a student of the Federal University of Rio de Janeiro ( Brazil ), and am working on a project that requires a 72V DC source for 4 propulsors of 0.5 HP ( total 2HP ). This battery should work for 8 hours with 0.5 HP ( average ), and with peaks of 2HP that would take around 5 minutes, and that would happen after every 20 minutes.

Would it be possible to be achieved with a battery like the Segway's one, adapted for 72V ?

Any help would be appreciated :)

Thanks

[stevew]

Segway batteries are 72V each a 3.0 amp hours, (60 nickel metal hydride sub-c cells per pack, organized as two 30 cell 36V series strings ) The Segway uses two packs, which it alternates between to balance the discharge of the two packs.
Hope this helps

[gotseg]

Im fairly sure that would work, may be able to get by with just 1 battery. What your gunna have to figure out is which are the + and - pins out of the (4) total i think.

gotseg?

No profit grows where is no pleasure ta'en:
In brief, sir, study what you most affect.

[W9GFO]

It would take 5 amps at 72 volts to make .5 hp

746 watts/2 = 373 (.5 hp)

373 watts/72 volts = 5.18 amps

The Segway batteries are 3000 mah, they can put out 3 amps for one hour.

You'll need at least 50 amp hours to run for 8 hours considering losses. That would be 16 Segway batteries, $4,800. Ouch!

Six 12 volt 50 amp hour AGM batteries would work nicely, would weigh a couple hundred pounds.

Rich H


quote:Originally posted by GuileSN

Hi there,

I am new to this forum. I am a student of the Federal University of Rio de Janeiro ( Brazil ), and am working on a project that requires a 72V DC source for 4 propulsors of 0.5 HP ( total 2HP ). This battery should work for 8 hours with 0.5 HP ( average ), and with peaks of 2HP that would take around 5 minutes, and that would happen after every 20 minutes.

Would it be possible to be achieved with a battery like the Segway's one, adapted for 72V ?

Any help would be appreciated :)

Thanks

[KSagal]

W9GFO's comment of 6 twelve volt batteries sounds similiar to my electric golf cart. I agree that the configuration discribed would work, but the size of the golf cart is needed because of the several hundered pounds of batteries.

I must wonder how large GuileSN's device is. Anyone that tries hard to compare my golf cart with my segway has quite a project, indeed!

Karl Ian Sagal

[terry]

Any of you guys get a depleted segway batt you can sell me? I'd prefer e or p series. Sounds dumb I know, but it's for an art project.....

TCHansen

[W9GFO]

quote:Originally posted by terry

Any of you guys get a depleted segway batt you can sell me? I'd prefer e or p series. Sounds dumb I know, but it's for an art project.....

TCHansen


Do you want the whole battery or just the casing?

Rich H