Running air compressor off deep cycle or cranking battery

Well that would also depend on a few things as well

1. The the size of compressor,

2. Whats the current draw? "Being charged" Does this mean engine running, and therefore supplying the current, or is it a battery charger / or solar panel thats putting in a few amps but the compressors is drawing a lot.


For example a small one drawing say 5 or 10 amps would be ok on either for a short run, but a bigger one like our BP160A series which draw around 42 Amps at full load will significantly drain the battery very quickly.

Assuming Engine running, then I would say it wouldn't really matter as the majority of the current is coming from the cars alternator.

We recommend that people always have their motor running while inflating tyres, as this keeps the voltage up around 13V which reduces the current draw,and also helps the motor run cooler.

3. How many tires or how long you intend to run it?

4. What size are the tyres.

5. bigger compressors normally have shorter leads to reduce the voltage drop across the wire, so if your 2nd battery was in the rear of the car running it off the 2nd battery would give you more reach with your hose. Or you could run it off the main battery and use a longer hose.

So I would suggest it wouldn't really matter as long as you were putting as much current back in as the compressor was drawing.

I run mine off the cranking battery and leave motor running when using the compressor
I would rather save the amps in the deep cycle for my refrigeration

Doesn't matter. While the engine is charging both batteries are joined together anyway so power is either provided by the alternator or shared by the two batteries.
Cheers Craig...............

Hi Garbage

Thank you for buying one of our compressors.

The ABR MK4 draws 40A at 13V and will take approx 2 minutes to inflate a standard tyre from 18 psi to 40 psi or just over a minute 18psi to 34 psi.

Please always let the car idle while using the compressor, off either the main battery or aux battery.

Regards

Derek from ABR

End of the day it isn't really going to matter what battery you run it off.

Air compressors are only used for a short amount of time and the current draw is not going to be high enough to cause a concern.

If your compressor draws 40 amps and you use it for 20 minutes blowing up some tyres.... your only going to be drawing 13 amps, not really enough to kill any good battery.

It's always advisable to keep your engine running and the rate your discharging you battery at will be less then it's getting charged at.

Simple answer is..... what ever battery you can get to the easiest to connect to.

A bit like my good mate above. Anything that is an accessory that I have installed, like a winch or compressor, and any fridge etc ( ie not belonging to the car) we run of the auxiliary pair of batteries. We run three 100AH All rounders with one kept as crank and the other two isolated through a 200 amp Redarc isolator.

Phil