Good Sam Club Open Roads Forum: Mini Split Air Conditioner / Heat pump
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 > Mini Split Air Conditioner / Heat pump

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MrWizard

Traveling

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Posted: 01/04/18 11:05pm Link  |  Quote  |  Print  |  Notify Moderator

6000 BTU, bedroom cooling to sleep
12v 28amps 340watts

that means 8hr of cooling uses almost 240ampHrs
approx 60% of a 4Gc in series-parallel

but 500w of solar would probably run it during the daytime
but you need to have more than that to recharge the power used during the night

still its only a little above 1/4 of the power the OP was talking about 10amps*120v 1200w

340w for 6000btu cooling, very efficient

(2) of those would be 12000btu and use less than 2/3 the power of a RV roof top unit

still quite a feat to do with only solar and batteries

you can get enough solar on the roof to run A/C part of the time during the day
its running day and night 24hrs that becomes a logistics problem of returning power to batteries while keeping the A/C running at the same time


Radiate The Happy
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Connected using Verizon and AT&T
1997 F53 Bounder 36s


pnichols

Santa Cruz Mountains

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Posted: 01/06/18 10:13am Link  |  Quote  |  Print  |  Notify Moderator

As a lot of you probably know, Earthroamer campers are designed to use battery powered air conditioning (as they have no generators on board).

However:

1. Their interior coach volumes are considerably less than that of a lot of Class A/B/C motorhomes.

2. Their windows, floors, walls, and ceilings are extremely well insulated.

3. Their air conditioners can only be run 8-12 hours before their large battery banks need to be charged - via a lot of sun time and/or idling of their dual-alternator diesel main engines.

So non-generator, partially solar based air conditioning is possible ... but it takes a lot of things to be set up just right ... including a main engine that can be idled for long time periods of no sun ... and maybe a hefty bank account.

There is possibly one best way to have sustainable self-contained, anywhere/anytime sun or no sun, quiet, and non-engine-idling RV air conditioning: Install onboard a large battery bank in conjunction with a built-in high amp hour recovery rate propane fuel cell system.

I prefer to air condition an RV with a generator - believing that it's (or should be) easier and less expensive for RV manufacturers, or us owners, to come up with a quiet diesel or gas generator way to handle it.


Phil, 2005 E450 Itasca 324V Spirit

cewillis

Tucson, az, usa

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Posted: 01/07/18 08:14am Link  |  Quote  |  Print  |  Notify Moderator

Here's another possibility -- Arctic Breeze . No price.
Small inside unit.
You'll see the 'recommended' power source is 6 AGM (unspecified capacity) batteries. I have 4 12v 140AH batteries. Seem to me that with a heavy duty (ie, 2 gauge) alternator charge circuit and 500+ w solar, this would be able to keep a smallish size camper from getting hotter than (your favorite hot place) during a brisk 115 degree Arizona summer afternoon on the rim of the Grand Canyon.


Cal


pianotuna

Regina, SK, Canada

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Posted: 01/07/18 11:28am Link  |  Quote  |  Print  |  Notify Moderator

They are $4200.00 and 8000 btu's

cewillis wrote:

Here's another possibility -- Arctic Breeze . No price.
Small inside



Regards, Don
Full Time in a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

valhalla360

No paticular place.

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Posted: 01/08/18 03:48am Link  |  Quote  |  Print  |  Notify Moderator

pnichols wrote:

As a lot of you probably know, Earthroamer campers are designed to use battery powered air conditioning (as they have no generators on board).

However:

1. Their interior coach volumes are considerably less than that of a lot of Class A/B/C motorhomes.

2. Their windows, floors, walls, and ceilings are extremely well insulated.

3. Their air conditioners can only be run 8-12 hours before their large battery banks need to be charged - via a lot of sun time and/or idling of their dual-alternator diesel main engines.

So non-generator, partially solar based air conditioning is possible ... but it takes a lot of things to be set up just right ... including a main engine that can be idled for long time periods of no sun ... and maybe a hefty bank account.

There is possibly one best way to have sustainable self-contained, anywhere/anytime sun or no sun, quiet, and non-engine-idling RV air conditioning: Install onboard a large battery bank in conjunction with a built-in high amp hour recovery rate propane fuel cell system.

I prefer to air condition an RV with a generator - believing that it's (or should be) easier and less expensive for RV manufacturers, or us owners, to come up with a quiet diesel or gas generator way to handle it.


I would argue putting big alternators on the giant propulsion engine is effectively equivalent to a horribly inefficient generator. You can do that with just about any pickup out there but if you are going to do it with any regularity, it makes far more sense to get a dedicated generator and be done with it.


Tammy & Mike
Ford F250 V10
2008 Copper Canyon 5er
Catalac Catamaran 34'
Full Time spliting time between boat and 5er


cewillis

Tucson, az, usa

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Posted: 01/08/18 08:34am Link  |  Quote  |  Print  |  Notify Moderator

valhalla360 wrote:


I would argue putting big alternators on the giant propulsion engine is effectively equivalent to a horribly inefficient generator. You can do that with just about any pickup out there but if you are going to do it with any regularity, it makes far more sense to get a dedicated generator and be done with it.


Agree -- if only running the truck engine to charge batteries.
If charging is only done while driving might still be inefficient, but it's a relatively small amount of energy compared to moving the truck / camper.

MrWizard

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Posted: 01/08/18 12:21pm Link  |  Quote  |  Print  |  Notify Moderator

For staying in one spot, i agree
But it's called Earth roamer for a reason
And charging while moving, is not going to significantly make a difference compared to the added fuel use of a dedicated generator

Using it as a generator while staying in one spot for several weeks, yeah big difference

pnichols

Santa Cruz Mountains

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Posted: 01/08/18 11:32pm Link  |  Quote  |  Print  |  Notify Moderator

Just as a reminder, from reading deep into the Earthroamer site one can learn that their design principles include not having propane on board or a generator on board. (Their cooking and coach heating are via diesel fuel from their main engine fuel tank.)

Since their design principles include that their vehicles be capable of camping for weeks just about anywhere, anytime, in any combination of sun availabilities, temperatures, and humidities ... their vehicles must of course include air conditioning being available anywhere, anytime. This air conditioning must be useable for as long as necessary, even with days and days of being in the shade, under clouded skies, or even all night.

They do this air conditioning of course via massive battery banks and as much solar as they can fit ... but they also do this regardless of how much sun is available day-in and day-out. When camping anywhere, anytime, without sacrificing comfort - the battery bank will have to be kept charged whatever way available without use of propane or an onboard generator. Hence they make use of all of their vehicles' capabilities, which includes when and if necessary ... idling of the main engine equipped with dual alternators to keep the battery bank charged during the times with little or no input from the solar panels. During these special times, they are not concerned with a large engine being idled to spin a couple of alternators. They are concerned with getting the comfort job done anywhere, anytime, all the time.

I guess that not all motorhome main engines should be idled very long for special-situation battery charging. We do this kind of battery bank charging an hour here and there, but it is a fairly modern V10 engine spinning only a medium size 130 amp alternator. I've read that it consumes about 0.7 gallons of gas per hour when used this way.

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