New off road motor

[melissachels]

I am no expert, but I do know a fair bit abut electrics, and I can't see a way of doing this without using a 24v alternator as rick suggests,and fitting 2 more batteries (3 in total) 2 for the winch and one for the normal operation of the car. It may be possible to use some kind of split charge to charge the new pair of batteries thought, but not sure how, solar panel on the roof maybe :nenau

i gonna get 2 gel batteries (740amp each) & keep car running whilst using winch, (and have booster pack :lol) 2 batteries = 24v run on a split charge so as both batteries are full all time & both can be used to run winch. i have never seen a duel alternator system hence why i asked if it was possible/ more advisable and how easy. am i better with a 24v alternator (and where do i get one?) or two 12v alternators?

 

[solarman216]

You simply cannot charge a 24 volt battery with a 12 volt alternator, and use the 24 volt battery at the same time (winching) the only way you can use the 12 alt is if you have a switching system that puts the two batteries in parallel whilst charging and then in series for winching, but complicated and messy, the only way is with a second 24 volt alternator, and I do not think gell batteries are a good idea as they generally do not put up with high discharge and charge rates, there are some but cost far too much, the amp pull of a winch is very high, my new one "off load" pulls 90 amps, admittedly with 24 volts that will fall to 45 but I will let you know in a day or so what it pulls on load, Rick

 

[(RIP) PLANK]

out of interest, have a look at this:

http://www.ebay.co.uk/itm/DC-DC-Pow...479?pt=LH_DefaultDomain_3&hash=item45ff208bef

That will only do 10 amps but in combination with a split charge relay could provide a 24v from 12v supply for batter charging - perhaps? and note this is only the beginnings of an idea so don't rush in!

I am sure this is doable, but as i said it does mean adding 2 more batteries, not just one, so you will have the weight, space and expense of a 3 battery system :nenau

 

[solarman216]

That will only run a radio, what happens when you run a winch from a battery that has an alternator connected to it, is that the alternator is pushed into giving its full output, and the rest comes from the battery, for instance if you have a 90 amp alternator it will (while winching) deliver 90 amps, now this is fine with a dedicated winch alternator, but it plays havoc with your engine management system if such a load is drawn from the normal car alternator after a very short time as the winch is drawing the rest of its needs from the battery, it soon gets to the point of too low a voltage for the engine to be happy, Rick

 

[(RIP) PLANK]

That will only run a radio, what happens when you run a winch from a battery that has an alternator connected to it, is that the alternator is pushed into giving its full output, and the rest comes from the battery, for instance if you have a 90 amp alternator it will (while winching) deliver 90 amps, now this is fine with a dedicated winch alternator, but it plays havoc with your engine management system if such a load is drawn from the normal car alternator after a very short time as the winch is drawing the rest of its needs from the battery, it soon gets to the point of too low a voltage for the engine to be happy, Rick

That was just an example, as you say the amps are halved with a 24 volt system and it will have two batteries to draw on, if they are isolated by something like a 'smart.com' relay, they would have no physical connection to the alternator and so the winch could not draw more than charging amps - However! it could flatten the two batteries. How long would the two batteries run the winch? :nenau

This is all just hypothetical, I am sure the best solution would be a 12v winch,

 

[melissachels]

out of interest, have a look at this:

http://www.ebay.co.uk/itm/DC-DC-Pow...479?pt=LH_DefaultDomain_3&hash=item45ff208bef

That will only do 10 amps but in combination with a split charge relay could provide a 24v from 12v supply for batter charging - perhaps? and note this is only the beginnings of an idea so don't rush in!

I am sure this is doable, but as i said it does mean adding 2 more batteries, not just one, so you will have the weight, space and expense of a 3 battery system :nenau

Hey its Mels man Neil my idea with the 2 battery's is to wire pos to pos and neg to neg then run winch between the 2 with a cut off switch working on the basic principle of jump starting a car should this not work?? im a mechanic / fabricator however my knowledge of split charging and 24v conversions are a little confusing to me :doh but i get the general idea of it!

 

[Fez_uk]

that would just give 12v with twice the amps.

 

[melissachels]

that would just give 12v with twice the amps.

So i'll at least get my motor started :jesterbg since its still playing up had two transits on it tonight to get it going & a full freshly charged battery! still no idea of cause tho

THINK I NEED AN IDIOTS GUIDE TO HOW I WILL GET THIS WINCH TO WORK! :lol

 

[briggie]

just get a 12v winch :augie

 

[solarman216]

. How long would the two batteries run the winch? :nenau

about ten minutes hard winching, then you will need hours at 10 amps to recharge

This is all just hypothetical, I am sure the best solution would be a 12v winch,

Defo but still need 2nd alternator as per previous post, Rick

 

[briggie]

You don't have to be mad but it don't half help:lol

Interesting project there Rick, wish I lived a bit closer to come and have a good look:thumbs

Jim

i hope to be going down in oct jim , if ya wanna ride shotgun

 

[melissachels]

yeah but that mean either trying to sell this one for the same amount as a 12v or swaping it for a 12v, it is brand new n never used. its the run up to christmas too

 

[solarman216]

just get a 12v winch :augie

As per post 70, Rick

 

[briggie]

As per post 70, Rick

great minds rick lol

 

[solarman216]

Hey its Mels man Neil my idea with the 2 battery's is to wire pos to pos and neg to neg then run winch between the 2 with a cut off switch working on the basic principle of jump starting a car should this not work?? im a mechanic / fabricator however my knowledge of split charging and 24v conversions are a little confusing to me :doh but i get the general idea of it!

no what you will do is still have 12 volts, to get 24 you have to wire the batteries in series that it pos to neg then on the end two pos and neg you have 24 volts but you cannot charge from 12 volt like this, so you need a separate 24 volt alternator, Rick

 

[solarman216]

i hope to be going down in oct jim , if ya wanna ride shotgun

be nice to see briggie and jim in Oct, Rick

 

[briggie]

i will be dropping sheila off at the caravan on the way down , so she can shut it down for the winter , so wont be a single run down , lots of work to do to my truck too rick , you will be busy lol

 

[briggie]

anyway , back to the original problem ...... even if you did manage to achieve 24 volts , and succesfully managed to charge them , you would still have to isolate your 24 volt system from the rest of your trucks electrics.

a lot easier to just swap your 24 volt winch for a 12volt one

 

[jims-terrano]

be nice to see briggie and jim in Oct, Rick

Cool, when you off Pete? I'm off down to Cranwell for a week in October tho.

 

[briggie]

sometime just after my birthday ... 18th

hopefully me and gerald will have finished the modifications to my radio by then