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Discussion Starter #1
Hey Robert

Welcome to the list 8^)

I added a subject title so EVeryone here knows what
this threads about. I'm a motor guy and will leave
this to the battery people here, but I'm sure it'd
help to get an idea of what range, voltage, and
current you're looking for.

Hope this helps

Jim Husted
Hi-Torque Electric

--- Robert Smith <[email protected]> wrote:

> Hi all
> wonder if people on this list could help. I'm
> building an electric motorcycle from a 1991 Yamaha
> Ninja. Bought a book to help me... I think I would
> like to have more variety to choose from for
> batteries than run of the mill car batteries...
> would like to look into LiIon, NiCad and am still
> quite ignorant of how many to use to get the power I
> want out of them. Any help out there, some
> direction.




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Registered
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70 Posts
Discussion Starter #2
Hi Robert,

Most people still go with lead acid batteries due to the low
(initial) cost. In a motorbike you'd at least want to look at sealed
lead acids / AGMs. Power wouldn't be a problem, but they do have
pretty low gravimetric energy density (i.e they're heavy) so you
wouldn't get a huge range.

NiCads are a possibility, they have higher energy density than lead
acid, but are pretty expensive. I tend to think Lithium are a better
option these days.

Most will agree lithiums are the best battery technology available
right now, but it can be hard finding suitable cells from a
respectable manufacturer for a reasonable price! ThunderSky are a
popular option (http://www.austinev.org/evalbum/battb/THUN), though
some people have had issues with their customer support (to put it
mildly), so YMMV.

Large prismatic lithium cells like the ThunderSkys are usually only
good for about 5C peak, which means a 20kg battery pack would be able
to put out about 10kW. If you're hoping to build something racey
(like killacycle.com), you'd have to look at higher power cells,
which generally means running many small cells in parallel. You can
do it yourself if you have access to a suitable spot welder, but I'm
not aware of any commercial solutions yet, unfortunately. (Several of
us on this list are currently exploring options - stay tuned!)

-Ian

> --- Robert Smith <[email protected]> wrote:
>
>> Hi all
>> wonder if people on this list could help. I'm
>> building an electric motorcycle from a 1991 Yamaha
>> Ninja. Bought a book to help me... I think I would
>> like to have more variety to choose from for
>> batteries than run of the mill car batteries...
>> would like to look into LiIon, NiCad and am still
>> quite ignorant of how many to use to get the power I
>> want out of them. Any help out there, some
>> direction.

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