24v vs. 12v - what are the advantages of 24 volts?

[lowenbrau]

Yeah, just when I don't need it anymore, look what I found...

24vDC to 120VAC inverter. 900W ---- 90bux!

 

[lowenbrau]

That sounds good deny,
So your 24 goes thru a converter to charge the 12 volt battery? Is it a charge converter? I was thinking of using a 12 charger designed for solar panels.....kinda like this one

http://www.canadiantire.ca/browse/p...older_id=1408474396673605&bmUID=1175027874894

But I am not sure if this would work. I thought I could take 12 volts from the truck system, run it thru this charge controller and then it would recharge till full then stop.

That way I would not have to isolate the batteries, and have my alternator only charging the 3rd battery. I would still though have a switch so I could turn this on when I wanted.

Since we're talking about a 12V rig in this case...
Why not just run a the third battery through a relay that is closed only when your ignition is in the run position. You charge when you are driving and then kill the accessory battery when you're camping. Truck starts in the moring as usual. Side benefit is that your accessory battery can help start the rig if you leave the lights on at the mall.