gokart battery

[Kin]

Ok! Yeah! You are right. I wasn't looking as closely at his parameters, somehow I read "I want to go 7 and 1/8 miles". apologizes.


Humor me for a moment, but: Perhaps there are certain benefits to a brushed system. If it's a drag race, perhaps there would be no need for a controller, and you could simply use some insane mechanical switch to connect the batteries directly to the motor (if it's just a DC motor, as opposed to AC or BLDC. Is that ever done? Kind of absurd, I admit.

[chbaird]

A mechanical switch works great until it welds itself closed and you can't open it when you're going 90+ mph down a very short road..

[999zip999]

Pic's please.

[Kin]

A mechanical switch works great until it welds itself closed and you can't open it when you're going 90+ mph down a very short road..

True! yeah. Freakishly true. Thinking through the consequences of what I suggested, I had a worried laugh. I suppose, though, that it could be designed with a failsafe (second crowbar designed to always be connected, but with the option of disconnecting it).

Still, I don't like the mechanical solution for further reasons in so far as it's so un-useful.

[Arlo1]

A mechanical switch works great until it welds itself closed and you can't open it when you're going 90+ mph down a very short road..

True! yeah. Freakishly true. Thinking through the consequences of what I suggested, I had a worried laugh. I suppose, though, that it could be designed with a failsafe (second crowbar designed to always be connected, but with the option of disconnecting it).

Still, I don't like the mechanical solution for further reasons in so far as it's so un-useful.

Yup working on harleys I have seen lots of start solinoids weld them selfs shut. The the bike wont quit cranking till you pull the battery wire off.

On another note You can not use a mechanical set up on a lot of motors the one I have is shunt wound so you need to limit the amperage going to the field coil seprate from the brushes and you can gain some speed by weakening it at higher rpms. As well you can not just short LIPO batteries to any motor as a rule because either the batteries or motor will fail. Lipo will produce more amps then its rated for causing damage to the battery and the motor is only going to take so many amps before the windings burn as well. Remember the brushed karts with BOOST SWITCHES use Led based batteries and led can take it because it just SAGS the voltage way down saving the motor!

[Kin]

True, Arlo1. There would have to be ways to limit the current. I was hoping the resistance in the brushed motor would be enough to limit the lipo's short so that things wouldn't blow up over 15 seconds, but I might be underestimating how precisely low the resistance of these batteries are. anyway, I think i distracted the post a little; i apologize. Your warning is good to keep so that anyone reading this out of context doesn't go ahead without thinking through that problem.

[Arlo1]

They are taking orders for prebuild Revolt (couger controllers) Here 144v 500 amp $700 pluss 20 shipping in us. 6 month warenty.

[Arlo1]

Pic's please.

Here is a couple of mine Its 234lbs with full rollcage and suspension. No driver or batteries.