HELP to electrify a pedal Go Kart for my son

[Mad]

Hi,

In a month will be my son's 5th birthday and I wanted a E-go kart for him.
I've been checking some ready setups but all of them looks shit.

I want to build it on this frame: http://www.bergtoys.com/jeep/junior.php
Ideal will be 10-15mph and enough battery for 25-30min.
Budget is 500-600 eur included go kart (229 eur)

Thanks in advanced.

PD: sorry about my english.

 

[Gödel]

10-15mph and enough battery for 25-30min.

So a five to eight mile range. Somewhere on this forum will be users' experiences of how many watt-hours/mile and watt-hours/mile per pound of vehicle weight they have achieved. With these samples you can judge the likely size of the batteries required, and the rest will follow.
Air drag at 15 mph may not be a problem but I'd do the math anyway, the estimated or measured drag coefficient times the cross sectional area.
With hard rubber tires the rolling resistance is probably negligible but it is easy to measure.

For batteries of a given volume, a Ragone Chart will show that you can't maximize w-h/kg and w/kg at the same time so here is a possible tradeoff between miles of range and top speed.

 

[nechaus]

whats your budget?

I once had this electric go kart called the chopper.. it had a small 200 watt brushed motor running x2 12 volt 8 ah sla's

it did not have a steering wheel.. you just used your feet and rope.. but it only cost me $100 AUD from toy world about 3 years ago.. ended up over volting it and it think it got up to about 30-40 kmh not to sure.. but it would be ideal i reckon..


How about building one ?

 

[torqueon]

Find a cordless electric lawnmower, can be had cheap, once the batteries go, most people, sell them off. lead acid would be fine for this build. Brushed controllers are cheap and easy to work with, however i would install a power cut off on the brakes, since brush controllers can go full power upon failure.

 

[inspiredvoltfreak]

You might want to check out my recent build. http://endless-sphere.com/forums/viewtopic.php?f=10&t=28022 I gave it to the kids at christmas, still have to go back and update the build thread, also this is an ongoing project. Based off a 4 wheel mobility scooter with a blown controller. Free from scrap metal pile.

Your idea looks doable. I would think any 500 watt ebike motor would be up to the task. One of the best priced batteries I've seen is the turnigy lipo cells from the hobbyking website. You could use a contactor controller like I did on mine, it was super easy to build, took only 1/2 hour. Custom switch I made however was around 3 hours.