Deems Davis
Joined: 09 Jan 2006
Posts: 925
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 Posted: Wed Nov 08, 2006 4:53 pm Post subject: Making 28v from 2 14v sources - Revisited |
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Well based on the response form Bob and others I revisited the
Engine/Belt driven A/C system. It turns out that with my engine and cowl
combination that there is not room enough to mount both a compressor and
an alternator. So, it looks like my options are; either to convert my
electric system to 28v (ugh!). or pursue the 'stacked' approach.
Bob:
When you say 'electrically isolated' are you saying that the "top"
system would have to NOT share a common ground with the bottom system?
what other 'isolation' would be required
"This would require a special alternator for the #2 machine." I assume
you are referring to the "top" system (?) could the SD-20 perform this
function as the alternator for the #2 machine, what is the "Special"
requirement of this alternator.
A bottom alternator large enough to carry ship's load plus the A/C load
is not a problem.
Re: backing up the bottom with the top. When you say 'complex switching'
I infer this is more than just the cross feed contactor approach in Z14,
care to elaborate any further?
Thanks for the information and advice so far and for any additional
insight you can provide.
Deems Davis # 406
Finishing - ( A Misnomer ! )
http://deemsrv10.com/
Robert L. Nuckolls, III wrote:
| Quote: |
<nuckollsr(at)cox.net>
At 11:10 AM 11/2/2006 -0700, you wrote:
>
> <deemsdavis(at)cox.net>
>
> I have built a 14v dual battery, dual alternator system. (Z14). I
> live in AZ and am interested in installing an air conditioning
> system. In researching a/c systems, I'm uncomfortable with the added
> mechanical complexity of running hoses and the engine driven
> compressor into the engine compartment. I concede that this may be a
> more efficient means of generating the power for the a/c, but it adds
> complexity/weight and a load in an area that I would prefer not to. I
> have identified a couple of sources that provide 28v AC systems. I
> have too much invested into my build re 14 v components to warrant
> redoing the electrical system (to 28v). So in noodling it seems to me
> that _conceptually_ one should be able to take a feed from each of
> the 14v systems and couple them together to produce the 28v required
> for the ac unit. So, for those of you further along the electro
> learning curve than I, is this _practically_ possible? If so what
> components would be required to make the connection to produce 28V?
>
> Thanks in advance for any consideration and input.
>
> PS Thanks for all of the input on the IPOD connect
Not easy. You'd need to craft an electrically isolated
14 volt system to "stack" on top of the grounded system.
This would require a special alternator for the #2 machine.
Further, the "bottom" alternator would need to be scaled
to carry normal ship's loads + the a/c.
The "top" system would not be useable for backing up
the bottom system without some complex switching.
The pitfalls of all this are considerable not to mention
the time and $ to implement it.
I'd jump on a belt driven compressor in a heartbeat.
Bob . . .
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