electric lawnmower
 

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.

What' the hp rating of your ice lanmower??

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

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

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 !!

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)