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PSI, Amps

I aquired a 130 Amp Delco alt to install into the Jeepster, and am considering different (cheap) ways of supplying compressed air without a belt-driven unit. I have looked at some pricey compressors like these,

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but am considering anothermethod. Is anyone using a power inverter and a 110V AC compressor? They have a little one with a tank at the parts store for $66 now, and the savings will help towards a portable welder. I guess I better drive the rig down and check amperage and how fast it will bring a 35 from 10 to 32 PSI, but i think the alt should handle it.

athaway Pines, California

Reply to
Paul Calman
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Reply to
L.W.(ßill)

It was a cute little thing, kind of like this one,

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have an HPLV from a Goldwing airshocks, it takes 20 minutes to fill a 35from 10 to 30 PSI, I could live with 5 minutes, but it's not worth $300 tome.

Reply to
Paul Calman

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For that unit you would need about 300 watts from the inverter, that's about

25 amps on the 12 volt side. It could work.

-- JimG

80' CJ-7, 258 CID 35" BFG MT's on 15x10 Centerlines 4.56 D30-D44 SOA D300 w/4:1 & Currie twin sticks Warn 8000i w/dual batteries LockRight F&R
Reply to
JimG

I was thinking 3300 Watts would carry 30 Amps at 110V AC

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allowing me to use my mini-mig, or asawzall too. I figure on the Jeepster i can easily put an air tank underthe floorboards in front of the rear axle, and put the compressor under thehood.

Reply to
Paul Calman

Problem is, 30 amps on the 110 volt side would be 275 amps on the 12 volt side (assuming 100% efficient). You could run small tools though, I don't know about a welder. Best bet would be to mount the inverter very close to dual batteries using large gauge, short lengths of cable.

JimG

Reply to
JimG

Reply to
L.W.(ßill)

You folks have me totally confused here....

I have it figured that a 350 watt or so continuous draw unit will turn a tool that is 3 amp, and maybe a 3.5 amp, but it could smoke out if used long.

Basically a 100 watt unit for every 1 amp draw.

They do sell bigger ones, but they start getting expensive fast.

My 350 continuous has two 115V outlets each separately fused with heavy wires and alligator clamps for hookup direct to the battery.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

JimG wrote:

Reply to
Mike Romain

Your example is inline with what I have said (although it is closer to 110 watts per amp; Watts = Amps * Volts ). I think what is overlooked is the current draw on the 12 volt DC side. Watts are watts on either side (assuming 100% efficiency, most units are more like 90%). So, a 350 watt inverter would draw nearly 30 amps from the battery at full load; Amps = Watts / Volts).

JimG

Reply to
JimG

It is fused on each plug with a 25 amp fuse.

The bigger units must do some other conversion somewhere or have really big fuses which is possible. The cables on mine could draw 50 or 60 amps easy.

You need a good battery and alternator to draw that large for long though.

Mike

JimG wrote:

Reply to
Mike Romain

The fuses are typically sized to protect the internal wiring of the inverter, and do not necessarily reflect output capability. If you short the receptacle, the fuse would blow before the internal wiring would burn up.

JimG

Reply to
JimG

yeah, it looks like realistically I will max out at 12V 125 A, providing

1500 W, just over 13 A at 110V. back to the drawing board.
Reply to
Paul Calman

That's not what Murphy sez. Murphy insists that the $5 component will always blow first and save the $0.05 fuse.

Reply to
Lee Ayrton

Thats after Rube Goldberg has upgraded the fuse to better one. :-)

JimG

Reply to
JimG

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