electric lawnmower

[speedy]

Hi !

I'd like to convert my stinky old gas lanmower into a clean electric one :)
But i don't know what motor to chose? Would a Turnigy 80-100-B 130Kv Brushless Outrunner (eq: 70-55)
Motor on 6s be enough ? i,d like to get about 2h of runtime and eqal power as the 4,5hp 4-stroke engine stock engine .

For battery i was thinking of using a 7s4p of 8000mah li-fe pack .

the lawnmower has an 25inch rotor.

[sabongi]

What' the hp rating of your ice lanmower??

[speedy]

the stock 4-stroke engine puts out 4,5hp

[sabongi]

don't see a problem, but would have to watch amps and temp closely... and the motor is not the most efficient...
probably going 14S life would be a good idea...

What do you estimate the cost of the conversion to be for you?

Why not just go buy a Black and Decker electric lawn mower. They have cordless versions now. Mine is a tethered version, been using them since I was a kid. Tons of longevity and good mowers. Just don't let the grass get crazy tall, or you might have to do it two sweeps.

ben

[speedy]

Yes icould buy a black n decker cordless mover but the i would missout on the fun in bulding stuff :) .

And the gas price here in sweden are high ! about 8$/gallon !! so an electric mover would be great !!

[TexasSP]

You need to find out what RPM your motor runs at as well so you don't spin the blade too fast or too slow. I think one of the big outrunners would work great but if it could be run on 10-12s I think you would have a more efficient system. You will definitely want a lot of torque so you won't bog down any.

Lawnmowers run at 3300 RPM. any faster can cause extreme problems (possible breakage of the blade)