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Dagonet

Member Since: 15 May 2019
Location: London
Posts: 10

Permanently Connected Compressor

Hi Folks,
I'd Like to have my compressor connected all the time rather than have to open up the battery compartment and connect the crocodile clips every time. What would be the best way to do that? This is my compressor: https://www.ebay.co.uk/itm/202981346559
Voltage: DC 12 Volt
Amperage: 45 Amps
Power: 540w

My reasoning is that I'll be more inclined to air down if I don't have to faff to air back up.
Any help appreciated.

17th Sep 2021 9:50pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3431

2012 Defender 90 Puma 2.2 CSW Santorini Black

I would put a fuse, a normally open relay and a switch on the dash to switch on the relay (and hence the compressor).

Do you need help with the circuit? 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

18th Sep 2021 6:28am

DSC-off

Member Since: 16 Oct 2014
Location: North East
Posts: 1432

2015 Defender 110 Puma 2.2 XS CSW Aintree Green

I've seen a great way to ease the air up process.
The guy had made up lengths of flexible air line in a circuit, a H arrangement. There were clip on valve connectors at the 4 ends, to fit on all 4 wheels.
The compressor connected at one point in the circuit, near to an adjustable pressure valve.

To air up at the end of the trail, he connected the compressor to the circuit, clipped it onto all 4 wheels, switched it on.
Then got out his coffee and sandwiches, and had a chat while his tyres were all blown up to the same preset pressure!

We were very impressed by this, not having to connect the compressor to each wheel.
He'd been using the method for a long time and reported no issues.This was in the USA, where airing up and down is much more common. Doing it every day for a week could become a real pain. Depending on the road miles between trails, some just left it at the lower pressure all week.

18th Sep 2021 8:05am

Dagonet

Member Since: 15 May 2019
Location: London
Posts: 10

Dinnu wrote:
I would put a fuse, a normally open relay and a switch on the dash to switch on the relay (and hence the compressor).

Do you need help with the circuit?

Thanks for the advice Dinnu. Your description is so clear I don’t need a diagram! Very much appreciated.

18th Sep 2021 8:17am

Dagonet

Member Since: 15 May 2019
Location: London
Posts: 10

DSC-off wrote:
I've seen a great way to ease the air up process.
The guy had made up lengths of flexible air line in a circuit, a H arrangement. There were clip on valve connectors at the 4 ends, to fit on all 4 wheels.
The compressor connected at one point in the circuit, near to an adjustable pressure valve.

To air up at the end of the trail, he connected the compressor to the circuit, clipped it onto all 4 wheels, switched it on.
Then got out his coffee and sandwiches, and had a chat while his tyres were all blown up to the same preset pressure!

We were very impressed by this, not having to connect the compressor to each wheel.
He'd been using the method for a long time and reported no issues.This was in the USA, where airing up and down is much more common. Doing it every day for a week could become a real pain. Depending on the road miles between trails, some just left it at the lower pressure all week.

Very fancy, I’m not at that level yet!

18th Sep 2021 8:18am

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

DSC-off wrote:
I've seen a great way to ease the air up process.
The guy had made up lengths of flexible air line in a circuit, a H arrangement. There were clip on valve connectors at the 4 ends, to fit on all 4 wheels.
The compressor connected at one point in the circuit, near to an adjustable pressure valve.

To air up at the end of the trail, he connected the compressor to the circuit, clipped it onto all 4 wheels, switched it on.
Then got out his coffee and sandwiches, and had a chat while his tyres were all blown up to the same preset pressure!

I've seen that sort of system before but it always strikes me as a bit odd, as tyre pressures are usually different, front and rear. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

18th Sep 2021 8:24am

DSC-off

Member Since: 16 Oct 2014
Location: North East
Posts: 1432

Easy to get round that.
Put a valve in the system to shut off the front half. Then continue to raise the rear pressure.

The main use was to quickly get from 16 psi to 30 psi for 30 or 40 miles blast down the highway. At the end of the week it would be prudent to check the condition of each tyre and set the pressure accurately before setting off for a 1000mile journey home.

Last edited by DSC-off on 18th Sep 2021 8:37am. Edited 1 time in total

18th Sep 2021 8:30am

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

I appreciate that it can be done. I'm just not sure that it is. I'm also not sure that it's significantly quicker than doing each tyre separately. Unless the compressor has a huge reservoir, it's output will remain the same but just split over four tyres. I admit that it looks cool though, and like the idea of a plumbed in airline. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

18th Sep 2021 8:37am

DSC-off

Member Since: 16 Oct 2014
Location: North East
Posts: 1432

It was no quicker to do all 4 together, just less trouble. Have a break, and leave it to it.

18th Sep 2021 8:41am

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3431

Dagonet wrote:
Dinnu wrote:
I would put a fuse, a normally open relay and a switch on the dash to switch on the relay (and hence the compressor).

Do you need help with the circuit?

Thanks for the advice Dinnu. Your description is so clear I don’t need a diagram! Very much appreciated.

I missed an even simpler connection, by for example using an Anderson connector, example fitted outside of the seatbox, and replace the crocodile clips with the Anderson counterpart. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

18th Sep 2021 8:51am

Dagonet

Member Since: 15 May 2019
Location: London
Posts: 10

This seems like the best option, and the least work!

18th Sep 2021 9:21am

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3431

I did something similar (but not an Anderson) but to connect a battery maintainer for when I am not using it. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

18th Sep 2021 9:57am

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