Hey guys i just aquired a 24 volt electric impact driver. I was wondering if there is some way to get 12 volts and 24 volts off my batteries at the same time, or if i would have to disconnect both batteries and hook them up in series to get 24v without being connected to the truck of course. then reconnect in parallel to get 12volt for the truck when finished using the impact. Thought maybe some of you army guys could shed some light on the subject. Thanks

Jed

 

the only way i could see doing it is to get a third battery and hook it off one of your existing batteries in series to the new one. its either that or you would have to hook your batteries in series and then hook up some sort of voltage reducer to run your truck.

 

thanks I didnt think it could be done with existing batteries just wanted to make sure I wasnt missing something

Jed

 

Couldn't you just wire the impact driver up in series to the batts, but leave the truck wired for 12v? If you used a Diode to shield the batts from one another would that make it possible to not blow 12v items up?

Jason

 

Nope! Don't try that!
Our diesel truck batteries are hard paralleled together with the big batt cables. Any attempt to put the two in series while paralleled and you short out a battery. Draw it out on a piece of paper and you'll see the situation!
Leave the truck batts alone and get a third small battery and connect it's negative to the vehicle's +12v battery bus to boost the tool voltage up to 24vdc.
Better yet, if you are REALLY serious about using lots of 24vdc power, make up a heavy duty Multi Pole Double Throw switch arrangement to series the 3rd batt to provide +24vdc when "up" and when in the "down" position, will parallel the 3rd batt to recharge it off of your CTD's electrical system...
Caution! Use a small amount of series resistance to limit charge current and protect it all with a reasonable value fuse or auto-resetting circuit breaker to prevent excessive amounts of recharge current going into the 3rd battery... (FYI, even some common big deep cycle batts are spec'ed to ~6 amps charge current MAX).
Our 2 paralleled truck batteries can deliver TREMENDOUS amounts of short circuit current so be careful and protect the wiring by including the fuse and/or circuit breaker!!!

K.

 

or....sell the 24V model and get a 12V model. cheaper, easier, and no extra rigging to buy and drag around. just a thought...

 

could sell it and get 12v one but got this one free it it loks to be very well built the name on it is roboimpact by aircraft dynamics
guess I'll just get small third batteryto use it with changing current setup.

Jed