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Post by donrull on Aug 18, 2016 14:40:31 GMT -8
I just purchased a 100 watt portable suitcase to fit on out Little Guy Tag Max XL camper which ia pre-wired for solar (Zamp). Many of the Little Guy owners have recommended this Renogy as it is almost directly compatible. However, I also know that it will not run my small window type A/C unit. What can I do to run my A/C off solar? I'm not sure if it's simply adding panels, battery, controller, etc. Any ideas? Thanks! Don
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Post by jsb2000 on Aug 18, 2016 16:31:51 GMT -8
I just purchased a 100 watt portable suitcase to fit on out Little Guy Tag Max XL camper which ia pre-wired for solar (Zamp). Many of the Little Guy owners have recommended this Renogy as it is almost directly compatible. However, I also know that it will not run my small window type A/C unit. What can I do to run my A/C off solar? I'm not sure if it's simply adding panels, battery, controller, etc. Any ideas? Thanks! Don No matter what you do, air conditioners are a HUGE energy drain. You'll need a ton of panels and batteries to run it, and the amount of time you'll have to run it will be minimal. Take a look around the forum...the question has been asked and answered many times. It's depressing, but air conditioners are energy hogs. Most people opt for fans instead.
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Post by frank on Aug 21, 2016 9:36:27 GMT -8
like jsb said power hungry. in Wisconsin we call it a swamp cooler. you can make one and use that, instead of that air conditioner.
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Post by cosmicboss on Aug 22, 2016 11:50:19 GMT -8
Envy those who can meet their cooling needs with a swamp cooler. They are just not practical here in Florida.
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Post by Admin on Aug 23, 2016 7:08:21 GMT -8
Hello Donrull, Like JSB mentioned AC units need a lot of wattage to run so it is very difficult to do with solar. It also depends on the draw that AC unit would have. I would recommend Contacting our Technical staff at 800-330-8678 and they can help you size a system to see if we could find an amount of panels that would work for your application! -A.L.
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Post by cosmicboss on Aug 24, 2016 6:25:39 GMT -8
You may have to consider running said AC off of a small LP generator, and everything else off your solar. You could still use the generator as backup for when the sun doesn't shine for days and you have no way to re charge your battery.
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Post by spiderbob on Aug 25, 2016 6:29:24 GMT -8
donrull, get the numbers off your AC unit that you wish to run with solar and do some math to give you an idea why it will be difficult, you are looking for the DC amperage rating. The amount of power you can use, or take out of the batteries, is essentially only as much as the amount you can put into the batteries. Naturally, the most important part of any solar setup is the amount of charging going on, and you want that to be greater than the amount of electricity you use. Technically, Watts = Volts x Amps. DC circuits run at 12 volts. An AC appliance (your Air Conditioner)will use the same number of watts whether running on a DC or AC. On a DC circuit (using an inverter of course) that AC appliance will use 10 times as many amps as it will on an AC circuit, 120/12 = 10. Now you have to throw in the fact that inverters are not 100% efficient, they only are about 85% efficient. So while figuring out your panel and battery needs, you must also figure out how big the inverter will need to be. Your request is not impossible, but may be impractical as your trailer weight max may not allow the additional battery weight alone. I'm not being negative, just trying to show you the down side of such a large system. Don't foget you also want it to run your air, probably most of a heated day.
Every day they are coming out with new technologies that are working toward that very use of power. Perhpas by using the new ion batteries ($$$$) and enough panels (even they are starting to get smaller and more powerful) you can actually make it work. As was mentioned, call the Renogy guys, they will be able to set you up accordingly, and then it's all up to you. Just remember, when it comes to solar, get everything you can afford.
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Post by cosmicboss on Aug 25, 2016 8:06:38 GMT -8
I am just hoping for the day that efficient DC powered HVAC units just become the norm. Lots of R&D ahead for the engineers.
And of course better panel, battery, and inverter tech.
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Post by spiderbob on Aug 25, 2016 10:20:22 GMT -8
Better HVAC might be a while yet,and I say that only because I have an in on that business and the mentality there is "if it works don't - with it" but the rest, indeed they already are. It's amazing what they have done just in two years and the things coming out next will also be head turners. Like computers, once you set yourself up with a excellent computer, out comes the new advanced better one Just in panels it's been awesome. These panels we are using now, where twice as big and much less wattage, not long ago. I fit six panels where I had four two years ago, with more wattage. Speaking of inverters, I had a 3,000 watt inverter 5 years ago that is 4 times bigger than my 2800 now.
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Post by cosmicboss on Aug 26, 2016 4:43:20 GMT -8
Here in the States that may be the mentality, but elsewhere in the world there is huge demand for air conditioning and energy in these places is much much more expensive. I don't know if anyone has noticed on photos from neighborhoods around the world on the internet (in europe, Japan, India, china) now they run those Mitsubishi (to name one) mini-split systems.
I work in the AEC industry (Architecture, Engineering and construction) and we have specified the large equivalent of these mini split systems for auto dealerships. They are multi unit systems attached to a single "condenser" mini cooling towers called VRF systems (Variable Refrigerant Flow) these type of units never start at 100% capacity like the forced air ones we are used to.
They slowly start pumping refrigerant as demand requires and just for the zones that are demanding it. There is a central computer that controls the refrigerant pumps and sensors throughout to monitor demand (heat) and humidity.
We have performed monitoring of these systems for a year after installation and the savings show enough for the units to pay for themselves in a very short period of time, and in our designs we are now encouraging dealership owners to get these systems.
They are more expensive, but the prospects of savings within a year or two are being enough for them to start jumping in.
Of course without the data, we would not have been able to get them sold on it. You will start seeing these type of units more and more out there in the wild.
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Post by cosmicboss on Aug 26, 2016 4:53:22 GMT -8
Two of our clients are now advocates for this technology, and we refer other dealership owners to give them a call and talk to them. Dealer owners listen to other owners.
Auto dealerships were (or still are) a very wasteful industry.
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Post by slothworld on Sept 6, 2016 18:23:55 GMT -8
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Post by spiderbob on Sept 8, 2016 15:11:18 GMT -8
So "slothworld", that was an interesting read, but wow the cost! It's viable, but my generator will work just fine until it gets a lot more R&D. I didn't work out the cost difference, but the gen and the diesel cost will work for me, but, that being said, if I had some money buring a hole in my pocket - I'd do it.
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Post by cosmicboss on Sept 12, 2016 4:56:23 GMT -8
I agree with Spiderbob.
It's not that it's impossible to do. It's that right now, there are more "efficient" (lack of a better word) or economical ways to approach running an AC off grid. Especially for the long run hours we have grown accustomed to.
It is clear that they have put in some serious tech. They also said it is only good for one unit unless you have the ability to haul a larger battery bank and solar array.
If anyone has the money and resources why not? Go for it!
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