Mini Split update for Offgrid

1235»

Comments

  • XRingerXRinger Solar Expert Posts: 508 ✭✭✭
    Never got interested in them, not for the DIYer, since you can't buy them off the web and get the warranty.
    And there's been some problems.. https://tedsenergytips.com/2014/01/29/why-i-can-no-longer-recommend-fujitsu-mini-split-heat-pumps/

    The new Gree Crown series is rated for -20 F, so it should be good for most of the winter in the Boston area..
    Not sure what's going to be coming in the next few winters, it might be getting colder, with more snow..
  • Dave AngeliniDave Angelini Solar Expert Posts: 3,340 ✭✭✭✭
    XRinger said:
    The amps go up.. But the KWatt hours are what count. BTU per hour uses how many KW hours, those numbers are what I'm looking at..
    Stuff like the EER, HSPF and COP are the numbers to look for when buying..

     And nope, I don't use grid-tied gear. I own one GTI, because I wanted to experiment with using it off-grid.. :) IIRC, that thing is toast now.. ;)
    What I mean is you are grid-tied!  Maybe not with an inverter but the reason we look at amps offgrid is we are running this mainly off the sun. Sure the larger systems I do have the capacity to run 24/7 and the SEER and amazing HSPS of the Fujitsu come into play. We want offgrid the minamum amps because in the extreme heat we are undersized and run at max on the mini split during the day. This is the strategy and the next larger heat pump would become more of a challenge at night.
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
    E-mail offgridsolar@sti.net

  • XRingerXRinger Solar Expert Posts: 508 ✭✭✭
    My point about power was trying to get the idea over to the causal reader here, that 1200 watts at 120 volts, pulls 10 amps. Whereas a 240vac cooler only uses 5 amps at 1200 watts. Seems like just saying "amps" isn't as accurate as saying power or watts..

    I've seen a few 120vac 9,000 BTUh Mini-splits, that use Less power, than the exact same model using 240vac. (to get the same BTUh out).
    For some reason the smaller 9k models using 120vac can be more economical than the same model using 240vac.. Or so it seems.
    I have no idea why..

    ~~~
    I'm always looking at how to heat.. Not so much how to cool. But, I had one room that always over-heats in summer..
    I may have already posted this here, but here it is again..
    http://ecorenovator.org/forum/renovations-new-construction/1597-suntex-solar-screen-project.html

    These solar screens are still working (since 2011) great! We just took them down for the winter.
    Anyone who lives in the sun belt, and has glass facing the sun, should check out installing some solar screens..
    They are amazing! The reduction in solar heat gain is instantly noticeable.   

  • Dave AngeliniDave Angelini Solar Expert Posts: 3,340 ✭✭✭✭
    Are the screens inside of the glass or outside?  We can't use anything on the outside during fire season.

    Other than your gree, I have never seen a 120vac model that was as good as a 240vac top of line in a brand.
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
    E-mail offgridsolar@sti.net

  • XRingerXRinger Solar Expert Posts: 508 ✭✭✭
    The screens can't be inside, since they get super hot. The absorb solar heat like crazy. Of course they emit IR at a high rate too.
    The only choice for something inside the glass, would be sheets of something that was highly reflective.

    Yeah, I just looked around online and don't see a lot of 120vac models.. I guess they aren't very popular.
    Gree might not have translated the specs correctly.. Some people on another forum, have been seeing problems in Gree Neo  specs.. 
    http://ecorenovator.org/forum/sale-trade-wanted-web-finds/4916-gree-neo-units-sale.html

  • Dave AngeliniDave Angelini Solar Expert Posts: 3,340 ✭✭✭✭
    edited October 2016 #127
    Thanks Rich!  We use black-out fabric on the inside and it is fairly fire resistant.
    Once the window blows out the party is over unless you are there to fight the fire.
    Stay in the East until the drought is over by at least 5 years....
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
    E-mail offgridsolar@sti.net

  • XRingerXRinger Solar Expert Posts: 508 ✭✭✭
    The other thing I was thinking is using screen frames to hold some kind of heat resistant film that's got a mirror finish..

    https://www.amazon.com/Gila-PRS361-Daytime-Privacy-36-Inch/dp/B000H5XTKG
    This inside film looks interesting. Not sure anyone would want it, unless they had a problem with the sun, all year round..

    When I was in the Navy, we did a controlled burn once and I went inside a nearby building
    to make sure it wasn't getting too hot.. I noticed some insulating foam blocks that were near a window were melting..
    The wall felt normal, the glass was warm, but the heat that could be felt inside that window was seriously hot..
    It was so strange, the chief had to see for himself, before we set up a water canon to put some spray between the fire and the building..


  • Dave AngeliniDave Angelini Solar Expert Posts: 3,340 ✭✭✭✭
    Three generations of Navy here. My brother always corrects me when I say that. One Italian Navy and 2 in the US Navy...
    Dad got sunk by a Kamikaze in Leyte Gulf but floated safely until they picked him up.
    There were no mini-splits back then, those guy's just cooked in the tropics!
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
    E-mail offgridsolar@sti.net

  • XRingerXRinger Solar Expert Posts: 508 ✭✭✭
    This summer, I found an audio book called 'Neptune's Inferno' and a paperback book 'The Last Stand of the Tin Can Sailors'. The war in the Pacific was pretty dang vicious. Now I know what my Uncles did in the war.. 
    I did my time at sea on WW2 Essex class carriers in the Atlantic.. 1 year on the USS Wasp and 1 year on the USS Essex.. The oldest and the boldest..  Burning up in the Caribbean, or freezing up around the arctic  circle.. No fun chasing Russian subs.. I should have stayed in the Bermuda FD. Firing fires was a lot easier.. Loved the beaches..
  • Dave AngeliniDave Angelini Solar Expert Posts: 3,340 ✭✭✭✭
    Very cool !  One of my clients is a Nam vet and he was on the Essex class Oriskany. 
    Were you guys flying F4's? My brother was in the last Navy F4 squadron.
    He has been sending me pictures of the new Ford class carrier with the elctromagnetic launch system.
    Navy still shaking down the Ford.
    Loved the beaches but liked it back on board where there were not any bugs!
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
    E-mail offgridsolar@sti.net

  • XRingerXRinger Solar Expert Posts: 508 ✭✭✭
    My ships were never modernized with steam catapults.  https://en.wikipedia.org/wiki/USS_Oriskany_(CV-34)#1957.E2.80.931968
    We also had wooden flight decks, not steel.. Plus, the Essex class isn't really large.. Not sure how well a very large fighter like the F4 would work on an Essex class.. We were anti-sub and had helos and propeller planes..
    When jets were on those WW2 vintage ships, they were not large jets.. Very small actually..  
    https://youtu.be/DOcuOyrMykU
  • XRingerXRinger Solar Expert Posts: 508 ✭✭✭
    edited April 24 #133
    FYI to anyone following this thread.. The Gree Crown (-20F) unit has a smallish surge when cooling, but the heating surges are very high.. Up around 11 amps at 240vac is pretty common in the winter.. Best avoid for solar..
    When it idles (after the area is warmed up), it used Zero watts (almost).. So it works a lot different that a Sanyo heating.
    Because the Sanyo will run at 470 watts for hours, before it will idle down to 40w (crankcase heater).
    Seems like the Gree turns off the crankcase heater.. If it has one... It's over-all power use is about the same as the old Sanyo..
    I like the Gree, I'm getting used to the big surges..  Of course I'm almost fully (98%) on the grid..
  • Dave AngeliniDave Angelini Solar Expert Posts: 3,340 ✭✭✭✭
    Lot's of rainy periods this winter, just over 90" and very little snow.   :) How did you guy's do Rich?
    What BTU is the Gree?  My Sanyo is still humming quietly. When they sold to Panasonic, I believe they just updated the Panasonic solar panels with the Sanyo technology. I have been getting them from my supplier and they are as good as a solar panel can get.
     I hear they are building a plant back by you to build for Tesla. Be well !
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
    E-mail offgridsolar@sti.net

  • XRingerXRinger Solar Expert Posts: 508 ✭✭✭
    I've got to run out right now.. But I just put a review online..  https://www.amazon.com/review/R2V93471F9OQR4
    I'll be back... :)
  • rbrown3rdrbrown3rd Registered Users Posts: 2
    edited October 17 #136
    I know this is an old thread, but I am hoping for some expert advice.  I live in a grid-tie home with the following specs:

    22 Sanyo HIP200-BAE PV Moduldes (4.4kw)
    2 Outback GVFX-3648 Inverters
    2 Outback MX-60 Charge Controller
    8 Concorde PVX-2240T  Batteries

    My system has been operational for ten years.  I live in South Florida and because of hurricane Irma, the grid was down for six days.  My system provided all of my power for those six days, operating perfectly....battery bank at night...PV during the day.'

    My original design included provision for a mini-split A/C in my bedroom, but we didn't install it because we ran out of money.  Now, I am able to do the install, but am faced with choosing a unit that could operated under the restrictions of my existing system.  The original design included a table with the following provision for a mini-split A/C:

    Future mini-split A/C . VA=900, Phase I A =7.5, kWh/day = 6.0

    Is there a unit that could operate from my PV and battery bank under these rather severe restrictions?  

    http://www.bbbrown.com/
    Detailed system description http://bbbrown.com/our-solar-home/4400-watt-system-description/

  • Dave AngeliniDave Angelini Solar Expert Posts: 3,340 ✭✭✭✭
    Definitely!   Nice family webpage!  There is info in this thread.  I left a note on your webpage.
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
    E-mail offgridsolar@sti.net

  • rbrown3rdrbrown3rd Registered Users Posts: 2
    Thanks Dave. I’ll take a look at your note.
1235»
Sign In or Register to comment.