I need some 12 volt help.. Daughter found this $3.00 kids ride on car with a couple of problems. The axle needed restraining because of broken plastic bit. Easy fix. The 6 volt battery was being charged with a 12 volt charger which wrecked the battery. I used an old genset 12 volt battery to get it going. Of course goes like a V8 now drawing approx. .75 amp at 12 volt. Now need to have some control over the speed. Slower for the learners and flat out for the older kids. I had saved an old variable speed cordless drill trigger so connected that and it worked so put a cable tie around it at approx. 3/4 speed.
What I would like to do is have two speeds selected by a switch. I am thinking that a resister in the positive line to slow it down and then a switch to bypass the resister.
The resistor will work but will waste power as heat. This will lead to a shorter battery life between charges and a hot resistor - perhaps very hot.
The car consumes 9W (12 x 0.75) and the motor equates to 16R (12 / 0.75). If you put a 15R resistor in series it will drop about half the power and generate around 4W. Use at least a 10W ceramic resistor and ensure it's protected from contact by children as it will probably burn them.
aussie_paul said
08:18 PM Jul 8, 2017
Mike Harding wrote:
The resistor will work but will waste power as heat. This will lead to a shorter battery life between charges and a hot resistor - perhaps very hot.
The car consumes 9W (12 x 0.75) and the motor equates to 16R (12 / 0.75). If you put a 15R resistor in series it will drop about half the power and generate around 4W. Use at least a 10W ceramic resistor and ensure it's protected from contact by children as it will probably burn them.
Thanks Mike. That is what I roughly reckoned. It is not like they ride it all day. The only 5 watt resister I had was 22R. Might even look at a home made pwm controller.
Aussie Paul.
valiant81 said
10:21 PM Jul 8, 2017
Hi all;
Many years ago my son had a electric trike given to him as a Christmas present. after about 12 months the batteries failed. Ended up replacing them with a 12 Volt 17 Ah gel cell battery, went like bat out of hell !!!. so ended up wiring the 2x 6 volt motors in series and worked for a further 2 years. Finely the little gear boxes gave out with stripped gears . Parts n/a.
Hey Jim said
01:34 PM Jul 9, 2017
Hi Aussie Paul,
Why not start from scratch and buy (Ebay) a cheap 12V winch and put a Washing machine pulley and belt assembly on a traditional Billy Cart.
Then Grandpa can show e'm how it was done back then.
They climb like a 4 X 4 with grand dad on board. I'm looking for some old photo's to put up.
Jim
aussie_paul said
02:19 PM Jul 9, 2017
Hey Jim wrote:
Hi Aussie Paul,
Why not start from scratch and buy (Ebay) a cheap 12V winch and put a Washing machine pulley and belt assembly on a traditional Billy Cart.
Then Grandpa can show e'm how it was done back then.
They climb like a 4 X 4 with grand dad on board. I'm looking for some old photo's to put up.
Jim
lol. Jim
Cruising Cruze said
07:38 PM Jul 9, 2017
@ Hey Jim
You've got more of them crazy idea's I Bet you Paul would have a go at it as well
Cheers John
macka17 said
11:51 PM Jul 9, 2017
I got a spare Boat trlr Elect winch if you want it.
blaze said
10:27 PM Jul 11, 2017
Get hold of an old 12v electric out board, remove the vertical shaft and then you have a variable controller with the motor
cheers
blaze
I need some 12 volt help.. Daughter found this $3.00 kids ride on car with a couple of problems. The axle needed restraining because of broken plastic bit. Easy fix. The 6 volt battery was being charged with a 12 volt charger which wrecked the battery. I used an old genset 12 volt battery to get it going. Of course goes like a V8 now drawing approx. .75 amp at 12 volt. Now need to have some control over the speed. Slower for the learners and flat out for the older kids. I had saved an old variable speed cordless drill trigger so connected that and it worked so put a cable tie around it at approx. 3/4 speed.
What I would like to do is have two speeds selected by a switch. I am thinking that a resister in the positive line to slow it down and then a switch to bypass the resister.
Thoughts please?
Aussie Paul.
The resistor will work but will waste power as heat. This will lead to a shorter battery life between charges and a hot resistor - perhaps very hot.
The car consumes 9W (12 x 0.75) and the motor equates to 16R (12 / 0.75). If you put a 15R resistor in series it will drop about half the power and generate around 4W. Use at least a 10W ceramic resistor and ensure it's protected from contact by children as it will probably burn them.
Thanks Mike. That is what I roughly reckoned. It is not like they ride it all day. The only 5 watt resister I had was 22R. Might even look at a home made pwm controller.
Aussie Paul.
Hi all;
Many years ago my son had a electric trike given to him as a Christmas present. after about 12 months the batteries failed. Ended up replacing them with a 12 Volt 17 Ah gel cell battery, went like bat out of hell !!!. so ended up wiring the 2x 6 volt motors in series and worked for a further 2 years. Finely the little gear boxes gave out with stripped gears . Parts n/a.
Hi Aussie Paul,
Why not start from scratch and buy (Ebay) a cheap 12V winch and put a Washing machine pulley and belt assembly on a traditional Billy Cart.
Then Grandpa can show e'm how it was done back then.
They climb like a 4 X 4 with grand dad on board. I'm looking for some old photo's to put up.
Jim
lol. Jim
@ Hey Jim
You've got more of them crazy idea's
I Bet you Paul would have a go at it as well
Cheers John
cheers
blaze
What does this do?
Aussie Paul.
Aussie Paul.