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[aprssig] Portable Ops from 12v via 115 VAC

Robert Bruninga bruninga at usna.edu
Wed Dec 29 15:25:33 UTC 2004


>>> ramirault at erols.com 12/29/04 9:57:54 AM >>>
>Bob, you don't address his main point .. that an inverter 
>draws *considerable* amps from the vehicle electrical system.
> YES, for *transfering* the power, over a long distance, 
>the higher voltage is better, but his point (I think) was 
>that a vehicle may  not be able to sustain this drain for very long.

Yes, I agree completely.
I was mostly commenting on the subsequent post from someone
that said he keeps a long run of heavy wire to get 12 volts into
his shack...  My point was that anything more than a few feet
will be better "transfered" at the higher voltage if he has to
go from the car to indoors. 

Bob
----- Original Message ----- 
From: "Robert Bruninga"
Subject: [aprssig] Portable Ops from 12v via 115 VAC


> For long distance portable operation from the car's 12v
> system, dont overlook using lots of small wire and an
> 110 inverter.
>
> Run an efficient inverter at the car to 110 then run
> your portable station on  AC using modern switching
> supplies.
>
> Even if your 12v rig draws 20 amps peak, this should
> only be about 2 amps over the AC cord and even if the
> drop over 300 feet of zip cord goes down to 90 volts, almost
> all switching power supplies these days can still work
> and deliver their rated output at the load.
(snip)
> Bob

>>>> wa7nwp at jnos.org 12/29/04 2:37:58 AM >>>

>> Bill, are you suggesting this actually WORKS?
>> I have a 300 watt inverter (500 surge), and it
>> Draws OVER 30 AMPS.  No car alternator will put
>> Out enough current to keep up with the drain at idle.
>> Are you willing to put a brick on your gas pedal and
>> Idle at 3,000 RPM to get enough current?
(snip) 


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