Go to the Northern Arizona Wind & Sun - Online Solar Store

Announcement

Collapse
No announcement yet.

smallest, most efficient A/C ?

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • smallest, most efficient A/C ?

    Hi all,

    Im looking for the smallest and most efficient air conditioner available and I dont want a water powered air cooler.

    this will be for a Van RV (very small space) Ive searched a little but guessing the best search phrase for a "tiny ac" is tricky.


    any suggestions? basically I want the smallest A/C unit there is.


    thanks!
    346w total w/4 Kyoceras | 400 total AH w/3 isolated AGMs | 25a MS SSD charge controller w/remote meter | 300w MS SS300 TSW inverter | 1500w Duracell/Xantrex MSW inverter | B&D VEC1093 40A charger | 80a GMC altenator | Honda EU2000i

  • #2

    Re: smallest, most efficient A/C ?

    Re: smallest, most efficient A/C ?

    I don't know that it meets your requirements--but this thread or two lists a small A/C system that plays well with Off-Grid systems:

    Sanyo mini split AC (inverter/variable speed)
    Sanyo Single Split systems (3,000-9,000 BTU)

    -Bill
    20x BP 4175B panels (replacement) + Xantrex GT 3.3 inverter for 3kW Grid Tied system + Honda eu2000i Inverter/Generator for emergency backup.

    Comment


    • #3

      Re: smallest, most efficient A/C ?

      Re: smallest, most efficient A/C ?

      Originally posted by notsobright View Post
      this will be for a Van RV .

      any suggestions? basically I want the smallest A/C unit there is.

      The smallest window unit I've come across is a 5,000 BTU. A mini-split unit installed in an RV van may be difficult, but could be done if you have the skills.

      A high efficiency mini-split beats the pants off any window unit AC as far as operation cost per BTU.

      Comment


      • #4

        Re: smallest, most efficient A/C ?

        Re: smallest, most efficient A/C ?

        Originally posted by notsobright View Post
        Hi all,

        Im looking for the smallest and most efficient air conditioner available and I dont want a water powered air cooler.

        this will be for a Van RV (very small space) Ive searched a little but guessing the best search phrase for a "tiny ac" is tricky.


        any suggestions? basically I want the smallest A/C unit there is.


        thanks!
        I have a Class B camper van I bought a couple of months ago, and I've put some hours into researching this very subject.

        What I came up with is this unit here:

        http://www.frigidaire.com/products/a...ners/FAA055P7A

        It's a 5,200 btu unit - but because it has an EER of 11, it actually uses a bit less power than the Frigidaire 5,000 btu unit which has an EER of 9.

        It also has a feature called "Low Voltage Start-Up". I have no confirmation of what exactly that is...but I'm guessing it is very likely something like this:

        http://www.modmyrv.com/2009/05/27/rv...tart-capacitor


        Best Buy has them, but you can find them all over the place if you look:

        http://www.bestbuy.com/site/olspage....egories&ks=960


        I haven't bought one yet, and since the summer is almost over I'll probably hold off awhile.

        Comment


        • #5

          Re: smallest, most efficient A/C ?

          Re: smallest, most efficient A/C ?

          thanks for the suggestions but those are more than I need. I found this thread:
          http://forum.solar-electric.com/show...light=portable
          where N3quik posted a link to this unit:
          http://www.globalindustrial.com/gcs/...campaignId=T9F

          seems more like what I had in mind but Im wondering.. Ive read about people converting freezers for refridgerator use, would it be possible to convert one (freezer) for air conditioning use? hmmm.
          346w total w/4 Kyoceras | 400 total AH w/3 isolated AGMs | 25a MS SSD charge controller w/remote meter | 300w MS SS300 TSW inverter | 1500w Duracell/Xantrex MSW inverter | B&D VEC1093 40A charger | 80a GMC altenator | Honda EU2000i

          Comment


          • #6

            Re: smallest, most efficient A/C ?

            Re: smallest, most efficient A/C ?

            I thought about the same thing. A co-work gave me a water cooler. They have a small compressor, so gave that a try. Problem was not enough surface area on evaporator coil. It would just freeze up. The ice got 1/4" thick. After that, it seam to stop cooling the air.
            Ken
            Telford,Pa
            Old Homepage: http://home.comcast.net/~n3qik
            Updated 6-7-2009

            Updated Homepage: http://home.comcast.net/~n3qik/site/?/home/
            Updated 12-3-2011

            Home Automation: http://n3qik.homeip.net:5800 Password = guest
            Software/hardware is 100% complete. At least for today. Tomorrow is a different story.
            Updated 2-17-2012

            Comment


            • #7

              Re: smallest, most efficient A/C ?

              Re: smallest, most efficient A/C ?

              Originally posted by notsobright View Post
              thanks for the suggestions but those are more than I need. I found this thread:
              http://forum.solar-electric.com/show...light=portable
              where N3quik posted a link to this unit:
              http://www.globalindustrial.com/gcs/...campaignId=T9F

              seems more like what I had in mind but Im wondering.. Ive read about people converting freezers for refridgerator use, would it be possible to convert one (freezer) for air conditioning use? hmmm.
              The main advantage in converting a chest type freezer to a 'frige is that the cold air doesn't "pour out" when the door is opened. This would be irrelevant if used for AC purposes.

              It takes a lot of power to pump heat energy from one location to another. The only thing that helps is to have a wide temperature difference between the heat you're 'dumping' and the area you're dumping it in. That's why ground-source heat pumps work well; the temperature several feet below ground is much lower than the ambient air in mid-summer.
              1220 Watts of PV, OB MX60, 232 Amp hrs, OB 3524, Honda eu2000.

              Ohm's Law: Amps = Volts / Ohms
              Power Formula: Watts = Volts * Amps

              Comment


              • #8

                Re: smallest, most efficient A/C ?

                Re: smallest, most efficient A/C ?

                Originally posted by notsobright View Post
                thanks for the suggestions but those are more than I need. I found this thread:
                http://forum.solar-electric.com/show...light=portable
                where N3quik posted a link to this unit:
                http://www.globalindustrial.com/gcs/...campaignId=T9F
                I can see that unit being used as described - in a cubicle.

                For a Class B RV (a van) I'd be interested in how well it works. And exactly how would you plan to vent the hot air out of the vehicle without sucking in hot air from the outside?

                If you try it, I'd be interested to know the results.


                Still, at 2.1a for 1000btu vs. 4.9a for 5200btu - I'd still go with the Frigidaire. That little unit will have to work non-stop I think, whereas the larger unit would run less - and no issue with venting the hot air out (simultaneously drawing hot air in).

                Comment


                • #9

                  Re: smallest, most efficient A/C ?

                  Re: smallest, most efficient A/C ?

                  Might look into a Petcool basicly a 2500 btu AC for a dog house, unit lives out side and runs air through an insulated duct, @350 watts as I recall though.

                  If the van has no added insultion you might need 5200 btu during hot weather.

                  I trust you'll run this docked to the grid? I run a 5300 btu for a few hours a night but have 1000 watts of panels more than what would fit comfortably on a van.
                  Home system- 20 - 200W Evergreen blems, 2 Classic Lites, E-Panel, 2 Prosine 1800 watt inverters, 800AH 24V forklift Batt, up and running 1 Classic Lite and 14 Suntech 185W in spare room.
                  Experience with Pulse/Trace PC250 Power Center, Original Rouge CC, 80-4/5watt 6v panels, Odds and extras,

                  Comment


                  • #10

                    Re: smallest, most efficient A/C ?

                    Re: smallest, most efficient A/C ?

                    Originally posted by Photowhit View Post
                    I trust you'll run this docked to the grid? I run a 5300 btu for a few hours a night but have 1000 watts of panels more than what would fit comfortably on a van.
                    Well, as for myself, I have an old Class B camper van that I picked up cheap a few months back (for $200.00...there was no way I could say no). My plan is to A) add a generator, B) add battery capacity, C) add an air conditioner and then D) add solar.

                    There isn't room on the roof of my van for more than perhaps 2 130w panels. I might get three on it if I relocate the 14" roof vent from the middle to the rear.

                    Which means that for the most part, the a/c would only be running when the generator was running. I like that the Frigidaire 5200 only uses 4.9a running, and has the "low voltage start-up", which I believe to be equivalent to a "hard start" kit for an RV a/c.

                    So, I should be able to run that a/c from a small inverter generator. I was just about sold on the Generac Guardian 3600 inverter gen due to its electric start and hard plumbing to the vehicle's fuel system, but now I think it will just be too much generator for such a small RV. (Microwave? Bah! We don't need no steenking microwave!) Also, there is a shelf on the outer left back door which from what I was told was used to carry gas cans for dirt bikes. That is the perfect place to build a box for a generator.

                    Right now, I'm looking very hard at the Honda EU2000i (98.5cc engine, 1600w rated continuous load), the Robin-Subaru R1700i (86cc engine, 1400w rated continuous load) and the Honeywell HW2000i (125cc engine, 2000w rated continuous load).


                    I'm planning to install 2 12v 105ah Deka AGM batteries and probably an Iota 45a or 55a converter/charger. The converter/charger will run from either shore power (usually only at home) or from the gen when camping. The decision about which converter/charger to use will have to come after I decide which generator to buy. The 45a Iota specs show "Maximum AC Current @ 108VAC 11 Amps" whereas the 55a shows 13a.

                    IF there is a problem running (compressor hot starting) the a/c from the gen, then I might add a third battery and put in an inverter to run the a/c - not to actually run it from the batteries, but to buffer the startup load. Even if I do that, the a/c won't be used unless the gen is running (or shore power) and the converter/charger is online.


                    [The pic was taken the day I bought it, it hadn't been moved in 15 years.]

                    [EDIT: As for the a/c, I plan to cut the hole for it in the fiberglass roof above the rear doors, as you can see in the pic it will easily fit.]
                    Attached Files
                    Last edited by dwh; August 28th, 2009, 15:07.

                    Comment


                    • #11

                      Re: smallest, most efficient A/C ?

                      Re: smallest, most efficient A/C ?

                      Looks like you have a rack for a small generator ready to go!

                      For what it's worth, when the fan went out on my semi pure sine wave inverter, basicly a MSW with more steps, I tryed to run my AC a couple times on a 1200 watt MSW inverter. it must be right on the cusp of what it takes to start the AC. When the sun was shinning during the day it kicked off, but it wouldn't start at night. Higher Dc voltage? not sure why. The next day I had the original inverter apart and had a small fan running 24/7 on it to cool it down.

                      Always nice to run motors on a true sine wave inverter. the generators will produce a pure sine wave, but cheap inverters create a MSW, which can be hard on motors.
                      Home system- 20 - 200W Evergreen blems, 2 Classic Lites, E-Panel, 2 Prosine 1800 watt inverters, 800AH 24V forklift Batt, up and running 1 Classic Lite and 14 Suntech 185W in spare room.
                      Experience with Pulse/Trace PC250 Power Center, Original Rouge CC, 80-4/5watt 6v panels, Odds and extras,

                      Comment


                      • #12

                        Re: smallest, most efficient A/C ?

                        Re: smallest, most efficient A/C ?

                        Yes, if I decided to install an inverter to run the a/c, it would be PSW. I am planning to install a Morningstar SureSine 300w PSW which should be quite enough for whatever I need to run on AC in the camper:

                        But a PSW inverter big enough to run (start) that a/c unit won't be cheap and I'm hoping to avoid it if I can. (Unless I can find a used one for lowbucks - I'm always keeping my eyes open.)

                        Comment


                        • #13

                          Re: smallest, most efficient A/C ?

                          Re: smallest, most efficient A/C ?

                          FYI UPDATE

                          I emailed Frigidaire and asked about running that 5200btu EER11 a/c unit from a generator. It took a while, but I finally got a reply.

                          "Product = Air Conditioner
                          Model Number = FAA055P7A

                          Low Voltage Start-Up: Systems are designed to start at 10% below their name
                          plate rated voltage under normal operating conditions.
                          This is the voltage requirements: Read the manual for generator to
                          understand about start up voltages and requirements.
                          Electrical Information
                          Voltage 115
                          Amps - Cooling 4.5
                          Watts - Cooling 475
                          Starting Amps 11.5
                          Starting Watts 1,322.50 Note: Generator must be capable of
                          handling this amount of wattage for start up plus whatever else is on the
                          generator.
                          Fuse/Breaker (Amps) 15
                          Power Cord Amps Min 13"


                          EDIT: I inquired further about how low-voltage start-up is achieved (actually, repeated my original query). I quickly received a reply:

                          "However to answer your question the fan comes on first and about 3 min
                          later the compressor comes on to keep the starting wattage down. The
                          wattage I gave for start up is absolutely required or it could damage the
                          product."



                          So the "low-voltage start-up" on the Frigidaire units is a timer delaying compressor starting until the fan is up to speed.

                          The RV "hard start" mod adds an additional capacitor, and *usually* that capacitor has a timer to delay firing - which achieves both easier compressor starting AND compressor delayed starting.
                          Last edited by dwh; September 1st, 2009, 15:30.

                          Comment


                          • #14

                            Re: smallest, most efficient A/C ?

                            Re: smallest, most efficient A/C ?

                            Sounds like they did it basackwards. (Starting the fan first, then compressor)

                            I would start the biggest load first (compressor) and then after it's spinning, get the fan going. (I think the compressor is the tough load to start)
                            http://tinyurl.com/LMR-Solar
                            http://tinyurl.com/LMR-BigLug
                            http://tinyurl.com/LMR-NiFe

                            Grundfos 10 SO5-9 with 3 wire Franklin motor (1/2hp 240V 1ph # 214505 ) on a timer for 3 hr noontime run - Runs off PV
                            Powerfab poletop PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe battery | 15, Evergreen 205w "12V" PV | Midnight ePanel || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT

                            Comment


                            • #15

                              Re: smallest, most efficient A/C ?

                              Re: smallest, most efficient A/C ?

                              the petcool looks intresting but for what it is the price seems too high.

                              http://www.americas-pet-store.com/de...odid/1486.html

                              what a deal dwh! now if we can find or design a cooling system that will run on 300w!

                              any refridgeration hackers on the board? Im thinking its project time..
                              346w total w/4 Kyoceras | 400 total AH w/3 isolated AGMs | 25a MS SSD charge controller w/remote meter | 300w MS SS300 TSW inverter | 1500w Duracell/Xantrex MSW inverter | B&D VEC1093 40A charger | 80a GMC altenator | Honda EU2000i

                              Comment

                              Working...
                              X