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Old 03-21-2008, 10:50 AM   #1
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I know Newmars are supposed to be well insulated but in the south with a huge windshield, I feel like my coach could use more AC output...and my units have the proper differential of at least 20 degrees from supply to return temps...How tough would it be to add a third unit and what kind of caveats are there....Has anyone explored this before?...could my 7.5 Kw gen handle it??
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Old 03-21-2008, 10:50 AM   #2
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I know Newmars are supposed to be well insulated but in the south with a huge windshield, I feel like my coach could use more AC output...and my units have the proper differential of at least 20 degrees from supply to return temps...How tough would it be to add a third unit and what kind of caveats are there....Has anyone explored this before?...could my 7.5 Kw gen handle it??
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Old 03-21-2008, 11:33 AM   #3
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Have you thought about getting something like this to cut down on the suns penetration on the windshield or your other windows?


http://rvtoystore.com/sunguard.html


Window awnings also help a great deal. I'm sure you could add an AC if you wanted too. I don't' think you would be able to run all 3 on a 7.5kw but thats just a guess on my part so take it with a huge grain of salt.
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Old 03-21-2008, 12:36 PM   #4
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My 2005 Dutch Star had the same problem of not cooling properly in the front on hot sunny days. I checked the intake and output of each air conditioner and there was a 22 degree difference in both so they were working OK.

I had Newmar add an additional outlet between the front two to get more air flow in the front and that made a world of difference. Now I can keep the front cool on 100 degree days.

You can add an outlet yourself. The duct runs from front to rear so just cut a hole in line with the other outlets and see if that doesn't help your cooling problem.
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Old 03-21-2008, 05:49 PM   #5
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I have the Sunguards on all the front windows already...they are helpful
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Old 03-21-2008, 07:34 PM   #6
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Aside from air plumbing challenges in adding the third unit, you might have a severe power problem. At a running load of about 18amp (2400watt) each, if all 3 were running they would consume your entire 7.5kw genset. There would be no starting reserve power so each time a unit tried to start with the other two running you'd probably blow the genset main fuse each time. In addition, you'd have nothing left to heat your coffee pot. There's a reason they jump the genset size when they go to 3 units.
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Old 03-22-2008, 12:12 PM   #7
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Larry, let me know what you end up doing. I have the same issue on very hot days, even with window awnings and sunscreens on the front windshield and side driver & passenger windows. I may consider upgrading my windshield sunscreen to a material that provides greater protection. The rear of the coach is always cool.
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Old 03-22-2008, 12:24 PM   #8
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Due to the likely large expense involved, I think I will do nothing except NOT face west at campsites....I usually stay under trees in the summer when possible
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Old 03-23-2008, 12:49 PM   #9
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MCD American Solo Shades

Has anyone installed MCD's new front window shades instead of using the standard Newmar pleated shade? I am not only looking to reduce the heat load from the front windshield, but also darken the front salon area of the coach in the morning.

MCD RV Innovations
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Old 03-25-2008, 07:28 AM   #10
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The AllStar is available with 3 ACs. When we tested the 7.5 Onan we found the 3 ACs shutting down the Genny. We ordered the 8KW Power Tech, which has been able to run all three successfully. One problem is there is no shedding circuitry standard in the coach(was not an option when we ordered and we completely overlooked it thinking it would be standard) which would help considerably when other loads are required(coffee pot, inverter/charger, etc.).
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Old 03-25-2008, 05:28 PM   #11
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I take it that a rig with 3 ACs cannot run all 3 at the same time when plugged into shore power. Is that true?
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Old 03-26-2008, 03:04 AM   #12
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Scottsdale:
I take it that a rig with 3 ACs cannot run all 3 at the same time when plugged into shore power. Is that true? </div></BLOCKQUOTE>

No, no problem with shore power(50amps-on each leg).
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