Battery-powered AC units for truckers...? - Page 3 - Fiberglass RV


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Old 06-26-2016, 03:56 PM   #29
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Hey ya'll. I am the Oliver owner running the AC with battery power. And regardless of what all the engineer types say it works. Now you may have an argument, but I have an experience. A key to this may be the Atwood Air Commander 13500, which is advertised to run on a Honda 2000i generator. I can attest to the fact that it will run on that small generator...even with a Propane carb, which I have.

So it occurred to me that if I could get past the LRA issue I could possibly start and run the Atwood using my 2000 W inverter and a transfer switch. I ran the unit on batteries for eight hours yesterday and it was close to 100 degrees. My Blue Sky remote showed 12 Volts and 93 percent full when I shut down.

I do have six Trojan T105 6V batteries with 362.5 usable Amp hours and they are connected with 4/0 welding cable. That does help. Keep those babies fully charged as in Handy Bob's blog and they will treat you right.

Is there magic here...maybe a little black box? Am I going to rely on batteries for AC full time? Heck no, but is sure is nice to have the capability.

If you see me at a rally check it out. Trailer name is Setting Sail and my Oliver is hull #64.

Enjoying my naps and lunch breaks with full AC and no generator I am...

trumpetguy


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Old 06-26-2016, 04:00 PM   #30
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One final comment. The compressor draws most of the Wattage and it cycles on and off leaving only the fan running so the draw is not continous. The Oliver's double hull construction provides a level of insulation not found in most other trailers, which makes for a more efficient setup.

The AC is 13500 BTU but Atwood advertises it has the same out as a 16500 BTU unit.


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Old 06-26-2016, 05:12 PM   #31
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Hey ya'll. I am the Oliver owner running the AC with battery power. And regardless of what all the engineer types say it works. Now you may have an argument, but I have an experience.
Well, I'm the only engineering type that posted and I'm simply quoting physics.


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My Blue Sky remote showed 12 Volts and 93 percent full when I shut down.
You ran a 13.5k BTU AC for 8 hrs on 6 Trojan 105's and your batteries were still at 93%. Figure out whats in the black box and patent it . I wish you and handy bob well. Raz
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Old 06-26-2016, 05:19 PM   #32
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I don't mean to ruin the party but..... Thirty five hundred BTU equates to 1025 Watts. At 12volts that would require 1025/12= 85 amps. You might get 5A. out of a 100 watt panel. Even with golf cart batteries, that's a heavy drain. Like Steve's, the numbers don't seem to add up for battery operation? What am I missing here? Raz
I'm not sure as I'm not an engineer and I'm very bad at math but I do know the air conditioner with a 100 watt panel and1 Agm battery with the inverter that comes with the the unit will defenetly work on DC for an extended period of time and of course it will vary with the amount of sun and the use of other DC items . The HC1 is of similar build as the Oliver with double hull and insulation between and this also helps as Dave stated. We also don't endorse the use of DC power as the sole power source for the fresh jet 3500 but as a way to supplement its use such as short rest stops or late evening cool down .
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Old 06-26-2016, 05:44 PM   #33
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I'm not sure as I'm not an engineer and I'm very bad at math but I do know the air conditioner with a 100 watt panel and1 Agm battery with the inverter that comes with the the unit will defenetly work on DC for an extended period of time and of course it will vary with the amount of sun and the use of other DC items . The HC1 is of similar build as the Oliver with double hull and insulation between and this also helps as Dave stated. We also don't endorse the use of DC power as the sole power source for the fresh jet 3500 but as a way to supplement its use such as short rest stops or late evening cool down .
Mike, I suspect you are really giving that battery a work out. Clearly someone sized the battery to inverter wire for a maximum current so someone must have a clue how much the AC is drawing. Knowing the amp-hrs rating of the battery, it's easy to determine how long the AC can be used without shortening the life of the battery. I'm sure the owners will let you know for sure. Take care, Raz
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Old 06-26-2016, 06:32 PM   #34
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What's Going on???

I might have the answer to how our friend is running his AC with battery. First off it takes the generator running to start the AC, I think that's what I read.
After the AC goes through a cooling cycle it shuts down, the generator shuts down. Generator is demand type, start when there's a demand and shuts down when demand drops below some level.
The battery keeps the AC's control system running (low current) until the next cooling cycle, when the generator starts again the whole cycle repeats.
Conclusion... AC is NOT running battery power, only the AC control system is.
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Old 06-26-2016, 06:37 PM   #35
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FYI The laws of physics that RAZ has refereed to are well known and have been around for well over 100 years. I've used that law for the last 60 years and never known it not to work.
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Old 06-26-2016, 06:42 PM   #36
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I might have the answer to how our friend is running his AC with battery. First off it takes the generator running to start the AC, I think that's what I read.
He is not using a generator to run or start the AC. It is running off his batteries with the solar panels providing the replacement power. I'm getting the impression there are those that just simply don't believe it is being done because they can't make the numbers match. Hell, I couldn't make the numbers match before he started this project and I told him it would not work. But it does. I believe it has something to do with elves or possibly Elvis.

Physics say a bumblebee can't fly, but somehow it does.
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Old 06-26-2016, 06:47 PM   #37
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Originally Posted by Steve Outlaw View Post
He is not using a generator to run or start the AC. It is running off his batteries with the solar panels providing the replacement power. I'm getting the impression there are those that just simply don't believe it is being done because they can't make the numbers match. Hell, I couldn't make the numbers match before he started this project and I told him it would not work. But it does. I believe it has something to do with elves or possibly Elvis.
Go read his post again. I believe he mentions a generator involved. It's NOT possible to run and AC with that small a battery. If it was I could run my whole trailer with a single AA battery. I've not heard of any body creating a perpetual motion machine. You don't get something for nothing in the world of physics.
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Old 06-26-2016, 07:09 PM   #38
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FYI The laws of physics that RAZ has refereed to are well known and have been around for well over 100 years. I've used that law for the last 60 years and never known it not to work.
Yes I am sure those laws apply to us also although we are trying to break as many laws as we can building the HC1 ha !ha ! but as I stated before the real benefit of this unit is its lightweight , half the weight of any other , being able to run it off of the smallest of generators and the ability to run the fan off of DC pretty much perpetually as all bigger units will only run on AC . No more having to install an air conditioner and a max fan . I am also not endorsing this unit for anything over a 13 foot trailer although the website states it is ok on a trailer up to 7 meters which by my bad Math is approx 22 feet.
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Old 06-26-2016, 07:26 PM   #39
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I'm getting the impression there are those that just simply don't believe it is being done because they can't make the numbers match.
You are quite correct. That's what engineers do. Otherwise all you get is magic and snake oil. No offense but this is pretty basic stuff. My best guess is that David is also giving his batteries a real workout and that his monitor is giving bad numbers. A simple volt meter could confirm it. Take care, Raz
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Old 06-26-2016, 07:43 PM   #40
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Hey Raz. You with Blue Sky right? My meter is a Blue Sky so what might be wrong with it. The charge controller had to be returned for a bum resister so maybe that's the problem.




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Old 06-26-2016, 07:47 PM   #41
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There are really two threads running here so let's not be confused. I am not using a generator...just batteries, a 2000w inverter and some elves. He he.



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Old 06-26-2016, 08:03 PM   #42
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....I am not using a generator...just batteries, a 2000w inverter and some elves. He he.



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