Air compressor question and the 4xE

[CsD]

hopefully not a dumb question for the group. .


So the compressor that I have is a smittybilt compressor that I connect directly to the battery to run. Worked awesome vas on board air in my last Rubicon.
My question is, people said when connecting up the winch, to pull the fuse for the main battery. I haven’t gotten along to this yet thanks to back ordered parts, but am I going to have an issue with connecting my compressor to the positive and negative terminals when I go to inflate after wheeling?

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[SnB4xe]

hopefully not a dumb question for the group. .


So the compressor that I have is a smittybilt compressor that I connect directly to the battery to run. Worked awesome vas on board air in my last Rubicon.
My question is, people said when connecting up the winch, to pull the fuse for the main battery. I haven’t gotten along to this yet thanks to back ordered parts, but am I going to have an issue with connecting my compressor to the positive and negative terminals when I go to inflate after wheeling?

I have used my Smittybuilt compressor clamped directly to the 12v battery posts without any issues. Seemed to work fine.

 

[CsD]

I have used my Smittybuilt compressor clamped directly to the 12v battery posts without any issues. Seemed to work fine.

Thanks for the vote of confidence. One of those things that I want to just ensure before heading out on the trail for the first time in the new rig.

 

[michail]

It's just a traditional battery that gets charged by a DC/DC converter instead of an alternator.

If the Jeep is "On" the DC/DC converter will keep the battery properly charged, which is helpful if you want to run a power inverter.

 

[SnB4xe]

Thanks for the vote of confidence. One of those things that I want to just ensure before heading out on the trail for the first time in the new rig.

I have the 2781 model and it aired up my tire from 25 psi to 35 psi in 30 seconds. Was quite impressed. I didn't even turn on the Jeep. Just connected to the battery and ran the pump. If I was filling all 4 tires then I would have started the Jeep just to ensure the HVB could maintain the LVB if necessary.

 

[Black96z]

It's just a traditional battery that gets charged by a DC/DC converter instead of an alternator.

If the Jeep is "On" the DC/DC converter will keep the battery properly charged, which is helpful if you want to run a power inverter.

Not when the hood is open. The DC-DC converter and the contactors to the 400V battery disconnect when the hood is opened.

 

[SnB4xe]

Not when the hood is open. The DC-DC converter and the contactors to the 400V battery disconnect when the hood is opened.

Good point. Depressing the two hood switches should make the vehicle believe the hood is closed so it might be a simple method to defeat the "open hood" scenario.

 

[michail]

With a little DIY, it could be possible to run a power line and connector. Some people have done that using the factory towing harness. But it seems like a lot of current for a towing harness.

 

[Black96z]

Good point. Depressing the two hood switches should make the vehicle believe the hood is closed so it might be a simple method to defeat the "open hood" scenario.

Yes, when I was doing my testing about how the 4XE charges the 12v I clamped the hood switches closed.

With a little DIY, it could be possible to run a power line and connector. Some people have done that using the factory towing harness. But it seems like a lot of current for a towing harness.

You could wire a 250 amp Anderson connector to the battery and one into your compressor leads and then just plug the compressor in when using it while keeping the hood closed. Its the same connector they use for a removable winch setup. They make a smaller connector that would be suitable too, a 100 amp.

 

[SnB4xe]

With a little DIY, it could be possible to run a power line and connector. Some people have done that using the factory towing harness. But it seems like a lot of current for a towing harness.

Yeah. The box said 45A max current so that is even higher than any of the auxiliary switch circuits. There are bunches of options though.

Simple and easy to open the hood and clamp onto those provided terminal posts but could easily run some battery cable leads to a n aftermarket power post on the front bumper. Could even wire a low voltage relay to the auxiliary switches that energizes the 12v positive cable for safety. Then opening the hood could be avoided. Seems like Jeep did make it easier for the owners to add devices to these vehicles. That is pretty cool actually....

 

[michail]

Although electronics are not my strength, I've been thinking of something like that for use with an inverter and pump. I like that idea of the relay, it would give me an excuse to get the aux switches!

I'm sure there must be a way an aux switch could be hooked up to prevent auto-off.

 

[SnB4xe]

Although electronics are not my strength, I've been thinking of something like that for use with an inverter and pump. I like that idea of the relay, it would give me an excuse to get the aux switches!

I'm sure there must be a way an aux switch could be hooked up to prevent auto-off.

I believe a forum member here has a YouTube video that shows how to connect an inverter and disable the auto-off timer. Brandon might be his first name?

 

[michail]

Yes, that was an entertaining video. I'm not sure why disconnecting the door disabled the auto-off timer. I've been trying to think of reason why. Brandon took a guess that it would work and it did.

 

[SnB4xe]

Yes, that was an entertaining video. I'm not sure why disconnecting the door disabled the auto-off timer. I've been trying to think of reason why. Brandon took a guess that it would work and it did.

Same. I am guessing he had some inside info perhaps? I wouldn't have thought to try that myself....

The auto off is probably there to avoid carbon monoxide poisoning. Removing the doors defeats any safety rating the vehicle has so that is why Jeep says for off road use only.

So, if the doors are removed and the user is following the Jeep guidelines then the vehicle is off road and also outdoors so the chances of carbon monoxide poisoning is nearly eliminated?

That is all I can think of as to the reason why. ??

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