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07-20-2021, 12:16 PM
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#1
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2 Rivet Member
2021 22' Caravel
Bozeman
, Montana
Join Date: Sep 2020
Posts: 51
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Recommendations for compact portable air compressor
I'd like to get a portable 12 V DC air compressor to keep in the trailer in case I need to add air to trailer/TV tires. Ideally it would be compact with long enough electrical cords/alligator clips to attach to the trailer battery and reach the trailer tires.
Any suggestions?
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07-20-2021, 01:07 PM
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#2
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Site Team
2017 30' International
Broomfield
, Colorado
Join Date: Apr 2009
Posts: 3,555
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Viair 400P-RVS. Works great. I mounted it in the bed of my truck as I use it pretty often.
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07-20-2021, 01:18 PM
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#3
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Rivet Master
2019 27' Globetrotter
Driftless Area
, Wisconsin
Join Date: Aug 2018
Posts: 783
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Quote:
Originally Posted by wulfraat
Viair 400P-RVS. Works great. I mounted it in the bed of my truck as I use it pretty often.
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Wulfraat, I like the idea of a permanent mounting spot for the compressor. Did you run the power leads to the battery under the hood?
__________________
Airstream adventures and enhancements thread: Traveling with Tatay
Personal blog (photography, travel, woodworking, flyfishing, food): nryn.com
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07-20-2021, 01:35 PM
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#4
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4 Rivet Member
2014 25' FB Flying Cloud
Hillsborough
, North Carolina
Join Date: Dec 2015
Posts: 314
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450P versus 400P
Also consider the 450P-RVS as compared to the 400P-RVS.
The difference in 33% to 100% duty cycle will become important when you decide to use it for winterization blow out
Wulfraat probably has more details on this topic
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07-20-2021, 02:12 PM
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#5
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Site Team
2017 30' International
Broomfield
, Colorado
Join Date: Apr 2009
Posts: 3,555
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You are right, my bad. I have a 450 - 100% duty cycle, but slightly slower to fill. That being said 33% would probably do fine too and the 400 is a bit faster / more CFM.
Mine is mounted in my truck bed under the cap. I ran heavier guage 6awg from the battery and grounded off negative to the frame. I mounted DC bus bars in the bed as well and also have a Victron inverter back there for my fridge, charging stuff, etc… neat and tidy.
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07-20-2021, 02:13 PM
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#6
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Rivet Master
1966 17' Caravel
1972 21' Globetrotter
SW
, Missouri
Join Date: Aug 2020
Posts: 701
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I went the Viair 450h. It is new so I don't have a lot to add. It is mounted under the hood but I am still working on finalizing the setup.
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07-20-2021, 02:41 PM
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#7
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Rivet Master
2020 23' Flying Cloud
2019 22' Sport
Sebastian
, Florida
Join Date: Nov 2019
Posts: 1,234
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I like my SmittyBilt. It’s robust enough to run without overheating, but not too big. The coiled air hose is long enough to reach my tires.
__________________
-Don
(That man in that tiny can)
(Same man, Bigger can)
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07-20-2021, 03:12 PM
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#8
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Rivet Master
2007 27' International CCD FB
San Diego
, California
Join Date: Sep 2014
Posts: 2,121
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For the OP, I would highly recommend the Viair 400P-RVS as a robust high performing air compressor. There's lots of smaller and more compact compressors on the market if you're only looking for an emergency use compressor, but the Viair is a quality tool that makes quick work of filling potentially 8+ tires on the rig. A task that can take hours with smaller compressors.
I recommend the 400P-RVS over the 450P-RVS. For typical travel trailer setups, it's the faster more performant unit. (ex @50PSI, 400P vs 450P, 1.65 CFM vs 1.27 CFM, 25amps vs 19amps). At typical tire pressures, is as good as 100% duty cycle as heat really becomes more of an issue at much higher pressures and larger tires that take extended fill time. So the 450P unit is slower and optimized for high pressure constant duty use for something like a Class A or tractor trailers.
I'm down the rabbit hole with compressors as it also supports my other off-road hobby and boondocking use with large 35" tires that take a ton of air. So I actually have a need for dual compressors installed onboard. With quick release airlines at the engine bay and tailgate. High performing compressors make all the difference when airing back up from 20PSI (on TV) and 30PSI (trailer) after an off-road journey as otherwise, I would not air down as much. And airing down is one of the best strategies for extended travel off-road.
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07-20-2021, 04:36 PM
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#9
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2 Rivet Member
2021 22' Caravel
Bozeman
, Montana
Join Date: Sep 2020
Posts: 51
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Thanks, all for these suggestions. I think that the 300P would suit the needs that I had in mind. BUT, the 400P is the smallest unit that works with the winterization kit. I could see it being really useful to easily be able to blow out the trailer on the road when returning to MT in the fall from warmer climates should I encounter early freezing temperatures. For example, I'm heading to CA for the last week of Sept. and the first week of Oct. We could potentially have snow here by October. Any of you make use of it in this manner?
Too bad that it's more than twice the price of the 300P.
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07-20-2021, 04:50 PM
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#10
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Rivet Master
2007 27' International CCD FB
San Diego
, California
Join Date: Sep 2014
Posts: 2,121
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The CFM capabilities at low pressure between the 300 and 400 are negligible so the 300 is certainly capable.
Where it's different is likely the provided airline and fittings in the kit. You could probably adapt the 300 to do what you need to.
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07-20-2021, 04:51 PM
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#11
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Moderator dude
1966 26' Overlander
Phoenix
, Arizona
Join Date: Apr 2002
Posts: 7,508
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Related question -
All of those pumps are listed as portable.
It looks like all of them come with a power cord that has clamps on the ends.
Is it possible to get the pump to work at it's max using the clamps. Or does the wiring need to be more securely connected to the power source? (Battery)
Action
__________________
1966 Mercury Park Lane 4 DR Breezeway 410 4V, C-6, 2.80 - Streamless.
1966 Lincoln 4 door Convertible 462 4V 1971 Ford LTD Convertible 429 4V Phoenix ~ Yeah it's hot however it's a dry heat!
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07-20-2021, 05:01 PM
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#12
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Rivet Master
2007 27' International CCD FB
San Diego
, California
Join Date: Sep 2014
Posts: 2,121
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Quote:
Originally Posted by Action
Related question -
All of those pumps are listed as portable.
It looks like all of them come with a power cord that has clamps on the ends.
Is it possible to get the pump to work at it's max using the clamps. Or does the wiring need to be more securely connected to the power source? (Battery)
Action
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No problemo with clamps supporting the 20-30 amps that these pumps draw. Clamps are capable of much more. To you point, would probably want to make sure they have a good bite on the terminals, paying to attention any corrosion.
Many of my off-road buddies use these same portable pumps, many times a weekend. No issue with clamps.
That said, Viair makes different variants of these same pumps. Some for hardmount install. Some that are IP67 rate and fully protected from the elements like what I have. These can be installed with heavy duty permanent wiring and switch systems. Which is nice as it avoids having to make space to store them, as they also can be quite hot after extended operation.
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07-20-2021, 05:16 PM
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#13
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Moderator dude
1966 26' Overlander
Phoenix
, Arizona
Join Date: Apr 2002
Posts: 7,508
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Thanks for the feedback
I have .. well multiple vehicles.
And just two different vehicles for longer trips. I like that kind of pump. And I like the concept of a more secure or permanent mounting. Just don't want to buy more than one pump.
If I did an exterior mounting, likely it would be relay activated. The relay mounted under the hood with the heavy load to the pump, controlled by a switch inside the vehicle.
Or just use the clamps. LOL
Action
__________________
1966 Mercury Park Lane 4 DR Breezeway 410 4V, C-6, 2.80 - Streamless.
1966 Lincoln 4 door Convertible 462 4V 1971 Ford LTD Convertible 429 4V Phoenix ~ Yeah it's hot however it's a dry heat!
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07-20-2021, 05:51 PM
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#14
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Rivet Master
2017 26' Flying Cloud
Tampa
, Florida
Join Date: Feb 2017
Posts: 7,653
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I use the Viair RV400P. Not constant duty, but supplies more volume than the 450.
The kit comes with hoses, and chucks. The cord is long enough to clip on the battery, then reach the tires with only one hose section.
If I lost it I'd buy the same tomorrow.
The only quirky thing is the compressor uses a male air fitting as does the gauge. So one hose is a master with female fittings and the second is an extension M/F.
I actually made a 30' hose with female fittings so I don't have to fight the coily tangles.
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07-21-2021, 10:05 AM
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#15
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3 Rivet Member
2017 23' Flying Cloud
Mesquite
, Nevada
Join Date: Jul 2019
Posts: 171
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I believe my Viair is a 300p, it has saved me changing tires along the road on TV. I have not mounted it because does double duty when I have aired down my Jeep off roading.
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07-21-2021, 11:31 AM
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#16
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4 Rivet Member
2019 30' Flying Cloud
Grass Lake
, Michigan
Join Date: Aug 2018
Posts: 280
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I also have a Viair mounted in the bed. I forget which model but it's 100% duty cycle and I have a 2.5gal air tank mounted under the cab with a service connection by the rear wheels of the truck. Used the factory upfitter switches via a solid-state relay to control the on/off function of the compressor.
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07-21-2021, 11:50 AM
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#17
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2 Rivet Member
2001 30' Classic S/O
Lady's Island
, South Carolina
Join Date: Jul 2015
Posts: 54
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Compact air compressor
Dewalt makes a nice 20v compressor.
Uses the same batteries as my drill, fan, blower and impact gun (all of which I carry)
I have a Vinair but never need it with the dewalt.
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07-21-2021, 01:19 PM
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#18
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3 Rivet Member
1959 24' Tradewind
Twin Falls
, Idaho
Join Date: Jul 2015
Posts: 247
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Quote:
Originally Posted by Brian R.
Thanks, all for these suggestions. I think that the 300P would suit the needs that I had in mind. BUT, the 400P is the smallest unit that works with the winterization kit. I could see it being really useful to easily be able to blow out the trailer on the road when returning to MT in the fall from warmer climates should I encounter early freezing temperatures. For example, I'm heading to CA for the last week of Sept. and the first week of Oct. We could potentially have snow here by October. Any of you make use of it in this manner?
Too bad that it's more than twice the price of the 300P.
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That is the same model I have and for my 24' Tradewind it worked just fine to blow out my pex lines and I saved $150 on the larger ones. I purchased mine at Techno RV, great people there and fellow RV's and use the products they sell.
__________________
Regards,
Tony
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07-21-2021, 08:21 PM
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#19
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3 Rivet Member
2018 26' Flying Cloud
Oriental
, North Carolina
Join Date: Apr 2018
Posts: 122
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ViAir. No more info needed. Others have given details. I like my ViAir!
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07-21-2021, 09:08 PM
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#20
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Rivet Master
2021 30' Globetrotter
Oviedo
, Florida
Join Date: Jun 2021
Posts: 1,372
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Since I’m heavily invested in Makita cordless tools, I always keep my cordless compressor with me. Would it fill a full sized tire quickly? Maybe in a week. But for topping off pressure it’s great.
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