Generator for Casita trailer - Page 5 - Fiberglass RV


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Old 02-26-2013, 11:48 AM   #57
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This is the stats for my air conditioner, copied from frigidaires web site...


My unit is 5000 btu Frigidaire ac Power and Performance: Cooling Amperage: 4.8 Cooling BTU: 5000 Cooling Wattage: 515 Cord Length (ft.): 6 Energy Efficiency Rating: 9.7 Kilowatt Hrs. per Year: 12877 Maximum Air Flow (CFM): 120 Rated Amps (Receptacle): 15 Room Coverage in Sq. Ft.: 150 Total Connected Load: N/A Voltage: 110/120V

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Old 02-26-2013, 11:58 AM   #58
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Cooling Amperage: 4.8
120 VAC amps. 12 VDC amps would be at least 10x as much. So, lets be optimistic and call it 50A, including inverter losses. That is still 2.6 hrs of cool off.
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Old 02-26-2013, 11:58 AM   #59
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I am surprised it is that low of a draw. Lets do some math, if the inverter is 100% efficient, (they aren't) then the draw would be 500W / 12V = 42A. If you have two group 27 130Ah batteries on your tongue, and only draw them down to half charge, that gives you 3 hrs of air conditioning. Not bad.
And really, if I stop at a rest stop it's already late and we are usually asleep within the hour. Usually sooner. So put it on a timer or let the low voltage monitor shut it down.

I would use the generator most times when not plugged into shore power. But this unit also covers for when shore power browns out or blacks out.

How many people leave the A/C running in their camper when they have to pay for it? I think most of us only run it as much as we have to if there is gassing up a generator or metered electric involved.

Jason

EDIT: I was looking into AGM batteries and putting them in a vented cell in the rear of the camper. It's a bugger to get back there so I figured I store something I don't access often. Buddy has a business lic and buys bulk. He offered to sell me one or two at cost.

I run the a/c off a 2000 watt inverter/generator now. It has no problem starting the a/c from an idle. I have run it off a 1200 (later de-rated to 1000) watt from Northern Tool. That was a struggle for it at first, but once it warmed up it did run the a/c for several hours.

I don't think locked rotor current will be an issue in this case. The inverter has a much larger surge rating than the generator.
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Old 02-26-2013, 12:06 PM   #60
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well except I have 2 55ah blue top batteries so about an hour... nah lol its a waste would rather run the generator.


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Old 02-26-2013, 12:09 PM   #61
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Recharging would be an issue. You would need a couple of hundred watts of solar, and a sunny day. A large alternator on your TV, with a #8, or larger power wire would recharge it over a couple of hours of driving.
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Old 02-26-2013, 12:22 PM   #62
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Jason, it sounds like you have a 5000 btu AC unit. We have one and used it for a few hours when it got up to 86F and high humidity. It easily cooled us down.

Glad to hear you AC unit ran on a 1000 watt generator. We have the similar $130 generator but never tried it on the AC. Amazing a $100 AC and a $130 generator for cooling.

As a testimony we and others have used that little generator for 5 years, mostly for emergencies but also for our Labrador trip, and it's still running. Hard to beat that price. I plan to try the generator on our AC this summer.

Thanks relating your experience.
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Old 02-26-2013, 12:35 PM   #63
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I also have a 5000btu ac in my ParkLiner and it says its pulling a little over 500 watts running...
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Originally Posted by David Tilston View Post
I am surprised it is that low of a draw.
I was a bit surprised too, so I looked at the physics:
1000 BTU/hr is 293 W, so 5000 BTU/hr is 1465 W. An air conditioner doesn't make heat, it just moves it, and these numbers suggest a coefficient of performance (heat moved per unit of energy used) of about 3 (1465/500), which seems plausible to me - it's one-tenth or so of theoretical perfection, and consistent with the reports that I've seen of real equipment performance.

Running a small air conditioner from a battery does not look sustainable on solar, but for a brief run once per travel day, if driving each day provides an effective recharge, it looks like it may be practical. Truckers are now doing this routinely, with a much longer run time, although they use large batteries and have substantial charging systems.
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Old 04-09-2013, 03:46 PM   #64
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I was shopping in Costso the other day and they have this unit with a Yamaha MZ engine for $549 ($599 but $50 instant rebate)



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Old 04-09-2013, 04:07 PM   #65
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I picked up a Yamaha ef 2400... used it over the weekend to keep my batteries topped offfrom the furnace. Worked great and real quiet
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Old 12-27-2013, 05:49 AM   #66
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Yes, I have a bigfoot 25rq also, and am shopping for generators; how often do you use yours and about how many hours do you have on your Yamaha generator? Where do you keep the generator?

thanks.

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Old 12-27-2013, 08:22 AM   #67
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Welcome to FGRV, Mark, please go here and tell us something about yourself Hi, I am.... - Fiberglass RV
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Old 12-27-2013, 08:32 AM   #68
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Our Casita has a 9000 BTU Roof Top A/C(pretty sure). It is a 2005. We just returned from the Quartszite Gathering and almost all the generators I saw there were 2000's.
Update. Since we now have an Escape 19 (2010), I hooked up the Honda 2000 to see how it would handle the A/C.

Not sure off hand the specs on it, but it is much easier on the generator than the one in the Casita, even with the Casita having an extra capacitor.

Not sure if it is a smaller unit, newer or a combination of the two, but the generator would hesitate noticably on the Casita when the compressor kicked in, and not even stutter on the Escape.
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Old 12-27-2013, 09:48 AM   #69
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Mark I keep my Yamaha in the ParkLiner door way. I think I might have 20 some hours on it.
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Old 12-28-2013, 04:35 AM   #70
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Update. Since we now have an Escape 19 (2010), I hooked up the Honda 2000 to see how it would handle the A/C.

Not sure off hand the specs on it, but it is much easier on the generator than the one in the Casita, even with the Casita having an extra capacitor.

Not sure if it is a smaller unit, newer or a combination of the two, but the generator would hesitate noticably on the Casita when the compressor kicked in, and not even stutter on the Escape.
I have an '06 SD with a 9000 series roof AC and wasn't sure if my Honda 2000 would run it. Well, during a hot desert summer night power outage after the winds blew some power poles down I got the chance to find out. Nothing like having bug out space. Anyway, it did a great job, 8 hours fifteen minutes on a full tank of gas. The genny only went to half power as the AC cycled on and off. Much inpressed as the microwave will run the rpm's up to max. DeadEye, I'm not sure of my specs also but when it's 90* - 95* at night and the AC is working so well in the egg.....you just have to smile, life is good
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