12V system with 24V starter & winch + Isolator & Deep Cycle

[dare92]

Hey all,


So I have a unique query.


I have a 12V system but I was wondering if I could hook up a second Battery to make it 24V for the Starter Motor & Winch. Between the series you'd run a Marine Multi-Battery Switch and the Winch would have a 500 Amp ANL fuse on the Pos.

This would allow me to have plenty of power for singe line winch pulls and have easy starts without draining a Deep Cycle.

The second part is taking the first system and somehow adding an Isolator + Deep Cycle for accessories like fridges.


Is something like this possible? Having found other threads online you can pick up high AMP switches and fuses from 'Blue Sea Systems'.


Cheers,
Matt

[the evil twin]

Yes, you can... but... why would you want to?

You are essentially describing a Safari in a simplistic way

Power is power IE it takes the same amount of power to spin the starter.
For a given wattage 2 x 12 volts in parallel will supply the same power as 2 x 12 volts in series
I don't see the point of trying to convert a 12 volt vehicle to use a 24 Volt starter motor when the existing one will do the job.

Winch is a different story.
Most 12 volt winch systems are series wound IE approx 6 volts in the Armature and approx 6 volts in the Field so it is easy to 'convert' to 24 Volt operation with some relay trickery.
But, again... other than line speed why bother?
You still need the same power for the same load

[dare92]

Well really 24V isn't needed it's just the AMPs. As far as I can find, there is no such thing as an Isolator over 200 AMPs. Which means you need to run off your primary battery(winch wise).

[Patrol'n]

According to the link below Red arc do two versions of their VSR, the SBI12 and SBI212, the 212 is designed to be used in applications involving winching from what I can see on page 5 of their instructions.

https://www.redarc.com.au/images/uploads/images/SBI_Instruction_Manual.pdf

[the evil twin]

Well really 24V isn't needed it's just the AMPs. As far as I can find, there is no such thing as an Isolator over 200 AMPs. Which means you need to run off your primary battery(winch wise).

Technically, you should run your winch off the Cranker anyway
There are any amount of 500 and 600 amp Solenoids out there http://www.ebay.com.au/itm/HEAVY-DUTY-Winch-Relay-Solenoid-12V-500Amp-5000lb-to-12000lb-4x4-Truck-Recovery-/221767784411?hash=item33a263d7db:g:XG4AAOSwqu9U8V-B

[Hodge]

I think Graham Cahill from 4WD action runs there setup you describe, from memory.

I think the winch is 24v , more volts, less amps scenario, therefore less heat

I could be wrong, it's been ages since I saw the shorty described DVD.

Sent from my SM-G920I using Tapatalk

[Rumcajs]

The multi-voltage systems like that are absolute PITA! I still have fond memories of old trucks running 12V everything except starter motor (24V) and the shyte that caused especially when clueless morons didn't know how to jump start such vehicle.....

As for 24V winch idea is, remember that true 24V winches are truck high mounts units and they have much higher loading/power outputs which brings us to the inevitable point where do you source all that energy from? You'll need to store it first aka batteries and most 4WD batteries are around max 100 Ah compared to the standard trucks batteries around 175 Ah. In bumping up voltage in series keeps capacity (Ah) amount the same where as with parallel you'll double the capacity but keeping the voltage the same.

What you read on Redarc site is exactly that increased the storage of electrical energy by using 2x batteries but at same voltage in this case 12V.

Regards

[MudRunnerTD]

I have fitted an isolated secondary 24v system into my GQ specifically for winching duties. Running a 12v winch with a 24v input increases line speed dramatically and drops the Amp draw and means the load on the system is less for a shorter period. Winner but only really at the pointy end of the game.

I have a single 800CCA battery under the bonnet for starting and Everything 12v on the car and 2 800CCA Gel batteries behind the passenger seat hooked up with 24v. I run 2 Alternators. A 12v and a 24v.

[MudRunnerTD]

There is a new switching Solenoid on the market that will convert 12v to 24v supply for winching too. If you want a link I would need to do some leg work.

[the evil twin]

^^^^^

Yep, that is what I was getting at earlier... aside from line speed from running a 12 volt winch on 24 volts there isn't a terrible lot of point in doing it.
It still uses the same amount of energy.

A Series/Parallel switch lets you do away with the need for the extra 24 Volt Alternator and you only need 2 instead of 3 batteries