running a/c on inverter

[coreyg67]

AMMETER!! I couldnt think of that for the life of me. As I said, I have no clue
about
electrical systems, so I ask dumbly, but openly!

I still cant help but think that the alt/inverter would be somewhat more
economical than
the genset, but I could certainly be wrong.

Thanks for the input!!

Corey & Jenni
1996 PT42
Prosper, TX


--- In WanderlodgeForum@yahoogroups.com, David Brady wrote:
>
> Hi Corey,
>
> I have run one air conditioner from an inverter, but on the LXi
> the inverter amperage draw occurs before the shunt for the
> ammeter, so the draw doesn't show on the ammeter (I thought
> all Wanderlodges were set up this way).
>
> When the engine is running, as soon as the battery voltage
> drops below 14.7V (or so), the alternator will start to put
> out some serious current to bring the battery banks back up
> to 14.7V. So you may get a few milliseconds of free battery
> buffer powering your AC when the AC first kicks in, but the
> alternator will power the AC from that point on.
>
> David
> '02 LXi, NC
>
> coreyg67 wrote:
> >
> > I agree with you to some degree, BUT, you have to take into
> > consideration the capacity of
> > the batteries on the coach. At which, the alternator is not required
> > to completely supply
> > the power for the A/C. I'm just guessing, I know absolutely NOTHING
> > about 12volt
> > systems, or converting D/C to A/C.
> >
> > David, have you ever run a single A/C with the switch as the coach
> > came equipped? If
> > so, what type of draw did you see on the Alt. output meter? Mine runs
> > at very low levels
> > the majority of the time, unless I've really drained the 12volt system.
> >
> > Corey & Jenni
> > 1996 PT42
> > Prosper, TX
> >
> > --- In WanderlodgeForum@yahoogroups.com
> > , David Brady
> > wrote:
> > >
> > > Hi Bill,
> > >
> > > No I'm not sure, but my gut feel is that the generator is more
> > > efficient. I'll have to look more deeply to see if I can come up w/
> > > numbers. I have one 300 amp alternator on my Series-60. Typically
> > > alternators are 50% efficient. When generating electricity you're
> > > better off generating high voltage and low current, which is what
> > > you'll do with the generator, and not do with the alternator.
> > > Add into this the losses at the inverter. This gives me the feeling that
> > > the genny will offer more economy. But I might be wrong...
> > >
> > > David Brady
> > > '02 LXi, NC
> > >
> > > Wilhelmus Schreurs wrote:
> > > > David:
> > > > Are you sure that running your big generator is more efficient to run
> > > > one a/c, from the standpoint of burning fuel to the output of the a/c?
> > > > With your engines you have two alternators, so each one would put out
> > > > 50 percent only and then have 50 percent left over for other items.
> > > >
> > > > Bill 84 FC 35 SB "$quanderlodge"
> > > > Terrace, B.C. Canada
> > > >
> > > >
> > > > ----- Original Message ----
> > > > From: David Brady
> > > > To: WanderlodgeForum@yahoogroups.com
> >
> > > > Sent: Tuesday, July 1, 2008 8:25:03 PM
> > > > Subject: Re: [WanderlodgeForum] running a/c on inverter
> > > >
> > > > My LXi is set up to run one AC off an inverter and the alternator, but
> > > > conventional wisdom is that you shouldn't do it. Steadystate current
> > > > draw from the alternator is 150Amps. I want to preserve my precious
> > > > alternator, so I always run the generator when I need my AC's.
> > > > Another point of view to consider the inefficiencies of the alternator
> > > > in generating DC and to add on to that the inefficiency of the
> > inverter
> > > > to convert to AC to run the air conditioning. The generator is more
> > > > efficient at generating the needed AC.
> > > >
> > > > David Brady
> > > > '02 LXi, NC
> > > >
> > > > coreyg67 wrote:
> > > >
> > > >> I'm trying to figure out a way to run 1 of my A/C units on the
> > > >> inverters and alternator. I
> > > >> would think with the two 2500 watt inverters, and the 300amp
> > > >> alternator, this would be a
> > > >> doable venture. Can someone tell me if, and how to do this task?
> > > >>
> > > >> Thanks
> > > >> Corey & Jenni
> > > >> 1996 PT42'
> > > >> Prosper, TX
> > > >>
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