How many ah?
 

Hi !

How. Large kapacity does a batterypack need to have to be able to power a 1:1 snowmobile with an 125hp bl motor in it, if you whant to drve it for about 45miles ?and what voltage would be good?

I don't know...but I would love to find out!!! Sounds like a fun project!

1.21 Jigawatts

125hp X 746watts per HP= 93,250watts
93,250watts / 44.4v (12S)=2,100amps
2,100 amps / 50C= 42,000mah cells
You could parallel 10 4200mah cells for each "S"
12S10P 42000mah pack would weigh ~100grams per cell so ~12000grams or 26.4lbs

Run time depends on duty cycle (ie throttle input).

Very rough math of course.

With current ratings that high, I would definitely go with much higher voltage, something like 200v or more. A motor/ESC that can handle that kind of power won't be cheap.

I thought I should point out that to match the performance of an ICE with an electric motor you don't need to match the HP. So assuming the snowmobile you want to convert had a 125HP ICE in it, if you put a 95KW electric motor in there I think stuff is gonna break. :smile:

I'm guessing here, but 50-70KW should be more than adequate to match the performance of the original engine. You'll also get a lot more runtime.

Yeah, a 95kw electric motor would have enough torque to rip apart the belts, wouldn't it? I wonder if backflips are possible on snowmobiles? :smile:

I know that backflips are....but what about standing backflips!? :O

But are there batteries that could power an snowmobile for 45miles on one charge and give the motor the same power as its ice counterpart ?

Do they exist? Certainly.

Would they fit on the stock chassis? Maybe.

Are you looking for WOT for 45 miles, or is this a backwoods grocery getter?

Hehe not wot all the time! But with variable speeds between 25 and 65mph

hahahaha LOL...