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06-01-2016 09:26 PM  4 years ago
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MPA

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Australia

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Seen these 12v compressors ?
Wondering if these are sold in the US or anywhere else under different brand.

Getting a few bad ones and found a few faults.

Watch at YouTube

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06-03-2016 04:11 AM  4 years ago
GREYEAGLE

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Flat Land's

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Seems you are cascading 3 for volume and not pressure.

Is their a air or pneumatic accumulator involved to balance the load among them ? ?

Yup seen em but not used for a specific duty volume application.
Usually tires, air brushes, around the house hobby stuff.

? What is the contraption ? You are using air lift cylinders ?? That need the speed or the coordination ??

Kinda Nutty what ever it is. Noisy as all get out .
greyeagle
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06-03-2016 10:02 AM  4 years ago
MPA

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Australia

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They are used to elevate the telescopic masts I make.

Watch at YouTube

The mast is 20m / 66ft tall with 6 sections and 140mm / 5.5 inch base section diameter, so the mast has enough volume to act as the receiver.

However it needs a huge amount of volume to elevate it.
Max pressure elevated is 10psi / 68kpa
But takes at least 400 LPM / 14CFM to elevate it fully in 70 seconds.

Choices for compressor are a few $k for unit that will do that volume at 12 volts.
Or cheap tyre comps at about AUD$300 each.

Customers are given the option and they choose the cheap option every time.
So having 3 means if one breaks they don't loose air and can keep working and it can be replaced later.

The demand is 10 psi max at 70 seconds per 15 to 20 minutes so using a 100% duty unit would be no advantage.

Problem is that when they units first come out from the original Chinese makers they are good enough, but then they sell parts out the back door to Chinese knock off makers who assemble them using the least skilled in the nth provinces and sell them under another brand.
The importers then start buying the knock offs cheaper and it gets hard to tell the good from the bad as they all look the same.

I started using the twin cyl ones, good for 2 years then went bad.
Theses ones came long about 3 years ago, all good no fails but after 12 months the sticker on the side changed and suddenly faults like this.

So this time I've made a video of it and I'm sending it to the local importers and see if it convinces them to go back to the original sellers of them to buy the units.

But I wont be holding my breath.
Till then I take a hit on each one and swap them for owners when one dies and give them a good hot run test before using therm.
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06-04-2016 09:21 AM  4 years ago
artimus

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Buckley WA

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I will take volume over pressure any day.....she can take the volume ......but the pressure makes her blow......cfm baby.Fly Hard......Team Viagra
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06-04-2016 02:13 PM  4 years ago
jharkin

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Holliston, MA - USA

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If you need a highly reliable 12v air compressor for a critical application, I would look at Viair. These are really popular with the rock crawling 4x4 crowd for onboard air systems.

http://www.viaircorp.com/
-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks
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06-05-2016 06:53 PM  4 years ago
MPA

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Australia

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They lack the flow rate we need like most compressors.
400 LPM / 14CFM at 12 volts.

The ones in the video are rated 150 LPM each so 450 total for 3 which is likely about 400 it most in reality.
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