running a/c on inverter

[Chuck Wheeler]

Keep in mind that if you are running one ac that draws 15 amps at 120 vdc you will be drawing somewhere between 165 and 190 amps on the 12 vdc side depending on the efficiency of the inverter. That's in addition to the normal current that is drawn from the 12 vdc circuits. That's a lot of current and a lot of heat! Alternators also have to be de-rated as the temperature increases.

- Chuck Wheeler-

FC 31SB Fort Worth TX

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From: WanderlodgeForum@yahoogroups.com [mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of Pete Masterson
Sent: Wednesday, July 02, 2008 11:39 AM
To: WanderlodgeForum@yahoogroups.com
Subject: Re: [WanderlodgeForum] running a/c on inverter

The '95 and later 'birds with the DD Series 60 only have one 300 amp alternator.

Pete Masterson

'95 Blue Bird Wanderlodge WBDA 42

El Sobrante CA

"aeonix1@mac.com"

On Jul 1, 2008, at 7:38 PM, 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 <"dmb993@earthlink.net">
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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