Thread: 12V compressor, 24V truck

Any clever ideas?

Are you running 2x12v batteries in series? If you are, take you supply from the terminals of one battery only?

Originally Posted by gimp

Any clever ideas?

Did'nt you chuck out a 24/12 converter early on,might have to put it back.

Originally Posted by Tussock

Why do you need a clever idea? How many amps the compressor need? Get a 24V-12V converter of the correct amp rating. They are big and not cheap. I have 10mm (from memory) battery lead running 24V to the back of the truck into 40amp 12V-24V converter. Run whatever I like back there 12V

Have two smaller 12V (10 amp?) in the front.

Don't run off one battery. I killed a battery like that. Uneven charge is very bad for them.

Exactly. If you run off one battery you will kill them as one slowly gets over charged and the other gets under charged. It is a good idea to remove them and charge them separately about every 3 months anyway because they have always have different capacities anyway. If you are passing back through this way @gimp I have a reasonably grunty converter sitting here that was going to go into the Safari but wont for obvious reasons.

Originally Posted by madjon_

Did'nt you chuck out a 24/12 converter early on,might have to put it back.

Nah I didn't take it out, it's hooked up to my trailer socket & only good for 10A

I think the smartest solution is to buy a 24V compressor

Could also look at converting air con compressor to air. Most vehicles that age the rest of the system is bung and they don't hold gas for long so are only used as an idler pulley.

It will pump twice as fast!

If u use a/c fit a York
Bullet proof and pump a large volume

Certain Sanden A/C pumps convert to awesome pumps, they have an internal oil sump for lubrication.

I've pulled my A/C idler and belt so the compressor is just sitting there doing nothing. May look at converting it to an air compressor.

Just get another 12v compressor and wire them up in series.
Job jobbed.

Get another converter?
What sort of current will the compressor draw?
http://www.aliexpress.com/item/32609...609388211.html

Reviving this old girl since I've been there.

I've done a separate 12v house batteries in the back to run 12v air with a vitron 24-12v charger

Single tapping a 12v batter from 24v system and a vitron batter balancer to sort out the imbalance.

I'd recommend sticking with 12v, if you ever sell it a 12v unit moves alot easier.

Originally Posted by mimms2

Not sure what voodoo the "balancer" does...
but I would generally not do that. You'll have the full charging current for the low/tapped battery, flowing through the charged/high battery...Not good.

https://www.victronenergy.com/batter...ttery-balancer

I've installed one of these into a 24/12v jump starting battery bank. Its limited current to a few amps. Keeps ticking along after imbalance event to sort out the batteries. Even with a pure 24v system you will eventually build up an inbalance between the two 12v banks.