Use 24V to Start a 12V Vehicle.

[Boyntonstu]

First:  DC motors can take higher voltages without ill effects, especially if run for short periods of time.

http://www.insidetopalcohol.com/threads/24-volts-on-12-volt-starter-add-a-sol-in-series.13979/

This link is a discussion of how to do it.

A few quotes:

24 volts will not hurt your starter as long as your solenoid only gets 12 volts.

24v to armature and 12v to the solenoid has always worked for me.

I did some heat tests. The 24v is actually cooler. Likely since it spins up so fast that less time is spent holding the button down.

Caution:  Not recommended for folks unfamiliar with electrical circuitry.

24 volts will not hurt your starter as long as your solenoid only gets 12 volts.


24 volts will not hurt your starter as long as your solenoid only gets 12 volts.

 

[John61CT]

Maybe worth discussing **why** even bringing up such an 'unusual' idea for discussion?

 

[highdesertranger]

this is a bad idea. there is no reason for doing this. on todays vehicles with all their electronics and computers if you hookup 24v to it you will fry everything.

why are we even having this conversation, it does no good. highdesertranger

 

[Boyntonstu]

this is a bad idea.  there is no reason for doing this.  on todays vehicles with all their electronics and computers if you hookup 24v to it you will fry everything.

why are we even having this conversation,  it does no good.  highdesertranger

The why of this post is simple:  The "How can one start a 12V vehicle with a 24V house battery?" question was raised and this is one solution.

The vehicle electronics will not be fried.   Nothing but the starter motor get to see 24 V if done correctly.

Another quote from the link above:

The 24 volt deal works great. Larry's battery's have worked well for us and we are wired just like every else that has posted with (2) 12 volt battery's and 12 volt solenoid. 

Just becareful not to put 24 volts to your entire car like I did. Only a split second but I had to change all the light bulbs in tach, shift light, oil lights etc. 

We can go 3-4 rounds and not even touch a charger.

Larry does have a nice CSI unit that Brandon may have mentioned. Don't have that piece but it looks really nice. 

I have the $15 Auto-Electric version. Works great

 

[tx2sturgis]

The link points to a guy called 'discodean' who wants to start the big motor on his dancing hydraulic car. I have no idea how this ties in to RV and van dwelling.

I'm guessing he is a young guy. Or....something. :dodgy:

Oh well...

Back to reality.

 

[Wabbit]

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If I smiley when I say it that means its illegal to feel I'm being insolent.

 

[John61CT]

The ASCII art doesn't resolve to anything intelligible on my screen.

Much like this topic, I see no reason to explore this?

 

[highdesertranger]

let's beat a dead horse. highdesertranger

 

[Wabbit]

...The ASCII art doesn't resolve to anything intelligible on my screen...

Thnx for the headsup. I'm on a 7" tablet. Just FYI, if you could see it you would admire my copy\pasta skills. Just sayin'.

It's a Picard facepalm. Why? Because of its originality.

EDIT: I appreciate thinking that is outside whatever box I am in. I do believe in warnings\disclaimers. I do not believe in discarding information just because it doesn't mesh with my world view or my limited experience with the world.

 

[tx2sturgis]

It's a Picard facepalm. Why? Because of its originality.

I see that now....but I was a bit puzzled...I kept seeing a fat hoot owl flying thru some kind of opening in a wall maybe...


Pssst....is that outside the box enuff?

:dodgy:

 

[666JTK666]

Pretty much
everyone is poo poo ing this 24v thing and realisticly it is not all that practical.
how ever if you are made out of money then there are some interesting possibilities.in

purchase and old van made in the late 60 all analog no computers.
install a cienhoff brushless mega amp 24v alternator or several.
retrofit mil standard headlights,tailights ect.
use a stirling power dc/dc battery charger.
install large 24v battery bank and 24v inverter.
install properly sized solar system for the long tail charge of the bank.

all 2 dang spendy for me.

 

[GGDirtyD]

I think it's a great idea. Good way to get your starter or anything else that you can get to run on 24v to work really well. More voltage is more power. A lot of the electric cars are already using these higher voltages cause they need it or they would be very slow. Turn your starter into a super starter or higher efficiency for your solar system. The downside is that it's ganna take a lot of knowhow to pull it off without breaking your bank. However, I think I may have found a solution. It would be expensive and could also be less reliable.

You could run everything in 24v except where it goes into your cars main electrical system. At which point you would use a step down transformer to step the voltage down to 12v. However, you would need either two alternators or 1 24v alternator. Not a good setup unless you got bank to break or for anyone that's not already planning on using a 24v solar system. I think this is what JTK was saying as well.

 

[wb8vyn]

Mack trucks used a series/parallel solonoid switch to disconnect every thing that used 12volts except the starter and elecrical fuel shut off valve during starting. fuel worked just fine on either 12 or 24 volts. the reason so that smaller cables could be used for the starter saving cost of starter wiring copper and to reduce the size/weight of the starter it's self. At least 2 12 volt batteries were required.
Ken