Re: I'm in over my head, would someone kinly throw me a life ring?

On Fri, 29 Apr 2005 14:40:36 -0500, Greg Postma
<gjpostma@xxxxxxxxxxxxxxxxxx> wrote:


>The device I seek is not for me. One of my clients (who has employed my
>services many times in the past) asked me to find a source for an
>inverter using 76Vdc in and 110Vac out. He said he would need about
>500ma. I sent my first plea for help shortly after I spoke with him.
>In my second post, I said "Ya know, the numbers didn't add up, (but what
>do I know) so after dinner I called the guy to get more information. The
>source of the DC power is 6-12v batteries (in series) so the voltage
>could be anywhere from 72vDC (6x12) up to 79.2vDC (6x13.2). He picked 76
>volts "cuz it's in the middle". After speaking with him,and offering the
>same suggestion I received "Just grab 12vDc off one of the batteries and
>use a commercial inverter" I was informed that the ONLY source of power
>was the 72Vdc. There is no access to any other power.
>
>So.... here we are. I'm still looking for a source of an inverter to go
>from 72vDc to 110vAc at about 10 amps. As for the location of where this
>is to used, I've got no idea. Could be for making coffee in a locomotive
>or powering a microwave oven in the space shuttle for all I know. I
>really don't know or care what my clients do with the products I locate,
>design or manufacture. Like wise, I don't care what they do with
>information I provide when I am doing basic research..... It's really
>nunna my business.....
>
>Hope I didn't sound ungrateful for the suggestions made by the group and
>I also hope that I didn't sound snobbish or boorish. I just thought
>that this project would be simple and it is starting to seem like the
>wheel has to be re-invented<g>.
>
>So if any of you kind, bright, energetic, good looking folks have any
>ideas that might help locate this elusive "grail" I would be most thankful.

---
What I find problematical is that you orginally asked for 500mA and
now it's up to 10 amps, and no mention has been made as to the output
frequency, frequency stability, or output waveform required.

--
John Fields
Professional Circuit Designer
.

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