Upright freezer and chest freezer

just startingjust starting Posts: 221Registered Users ✭✭
So I purchased a 6.9 upright freezer to be a fridge the usage with a 7 cf chest freezer is about 600wh per 24 hour so works good
200ah LiFePO4 24v Electrodacus Sbms40 quad breaker chest freezer to fridge- Samlex PST 1524 - Samlex pst3024  - 1hp shallow well pump-Marey 4.3 GPM on demand waterheater - mama bear Fisher wood burning stove, 30" fridgarair oven ,fridegaire dishwasher  Unique 290l stainless D.C. Fridge-unique 120l portable fridge/freezer 

Comments

  • softdownsoftdown Posts: 1,879Solar Expert ✭✭✭✭
    Freezers tend to have much thicker insulation... Refrigerators tend to disappoint me with their 1" sides.
    First Bank:16 180 watt Grape Solar with  FM80 controller and 3648 Inverter....Fullriver 8D AGM solar batteries. Second Bank/MacGyver Special: 10 165(?) watt BP Solar with Renogy MPPT 40A controller/ and Xantrex C-35 PWM controller/ and Morningstar PWM controller...Cotek 24V PSW inverter....forklift and diesel locomotive batteries
  • jonrjonr Posts: 1,068Solar Expert ✭✭✭✭
    Another advantage of an upright freezer as a refrigerator is more compressor reserve capacity.  More reserve capacity combined with thermal mass (water bottles) and good insulation allow more use of load shifting (for example, turning it off for early morning, before sun  hours).  Turn a regular refrigerator off for too long and it may not be able to catch up in any reasonable time frame.
  • just startingjust starting Posts: 221Registered Users ✭✭
    Not sure why someone would unplug the freezers. I just have a 1500watt inverter and can still wash clothes or (dry clothes in the drier with the dishwasher on) , with a tv on and a blue ray with surround sound never had a overload the freezers just surge at about 1200 watts for like 1/30 of a second then drop under 160 watts then down to about 80 over about two to three min I just have it set so if the fridge aka upright freezer turns on the chest freezer shuts off and cannot turn back on until the fridge is done + 5 min so fridge has priority over freezer. And with average draw under .8 kw for 24hours say a day I add meat to freezer. With just a 750 watt array( real power at full sun no clouds) it's easily achievable not to unplug the freezers ever.
    200ah LiFePO4 24v Electrodacus Sbms40 quad breaker chest freezer to fridge- Samlex PST 1524 - Samlex pst3024  - 1hp shallow well pump-Marey 4.3 GPM on demand waterheater - mama bear Fisher wood burning stove, 30" fridgarair oven ,fridegaire dishwasher  Unique 290l stainless D.C. Fridge-unique 120l portable fridge/freezer 
  • mike95490mike95490 Posts: 7,874Solar Expert ✭✭✭✭
    Not sure why someone would unplug the freezers. .....
    I've got a timer set on my freezer, to get batteries through the night in severe winter cloudy conditions. Shuts it off from 4pm to 8am. In the garage where it's cold anyway, and shifts the freezer run time to daylight hours or times I run the genset. 
    In the summer, loads of sun and power - no problem
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

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  • just startingjust starting Posts: 221Registered Users ✭✭
    edited March 8 #6
    I understand in your situation being way up north and having limited sun. Guess I'm just spoiled being next to the only 14er by it just off the plains makes for about 350 days with at least 4 hours of sun.
    200ah LiFePO4 24v Electrodacus Sbms40 quad breaker chest freezer to fridge- Samlex PST 1524 - Samlex pst3024  - 1hp shallow well pump-Marey 4.3 GPM on demand waterheater - mama bear Fisher wood burning stove, 30" fridgarair oven ,fridegaire dishwasher  Unique 290l stainless D.C. Fridge-unique 120l portable fridge/freezer 
  • jonrjonr Posts: 1,068Solar Expert ✭✭✭✭
    edited March 8 #7
    Any time you run directly (vs from batteries), you save wear and tear on the batteries.    Ideal would be a refrigerator that ran only during sun hours and never hit the batteries - without excessive temperature drop, even in summer.

    I suppose the ideal timer device would measure temp drop, ambient temperature and time of sunrise and optimize the whole thing.
  • softdownsoftdown Posts: 1,879Solar Expert ✭✭✭✭
    Temperature fluctuations in a fridge should be acceptable as long as the temp stays below ~46F or so.....depending on the commodities. In a freezer, I think the food would get a lot of ice particles quite quickly. That happens now with the temp. within plus/minus a couple degrees of 0F. 
    First Bank:16 180 watt Grape Solar with  FM80 controller and 3648 Inverter....Fullriver 8D AGM solar batteries. Second Bank/MacGyver Special: 10 165(?) watt BP Solar with Renogy MPPT 40A controller/ and Xantrex C-35 PWM controller/ and Morningstar PWM controller...Cotek 24V PSW inverter....forklift and diesel locomotive batteries
  • jonrjonr Posts: 1,068Solar Expert ✭✭✭✭
    edited March 10 #9
    I calculate that the pumping due to a daily 10F temperature variation in a freezer causes a 2% air change.  So perhaps equivalent in frost to opening the freezer one extra time every month.

    In terms of food damage, no doubt that you need to run a refrigerator/freezer that varies in temp somewhat cooler.   For example, if you normally run at 0F steady, you might have to go to -7/+3F with a timer.
  • EstragonEstragon Posts: 2,773Registered Users ✭✭✭✭
    Temp variance would obviously depend on insulation and use (door opening, adding warmer food, etc). My home-built top load freezer would take days to go from -7 to +3f if left closed and reasonably full.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
  • jonrjonr Posts: 1,068Solar Expert ✭✭✭✭
    edited March 10 #11
    @Estragon :  could you get away with running it only during sun hours?  Perhaps with an over-ride button if you added a lot of warm food.

    Refrigerators/freezers are often a big load on a solar power system.  It's worth talking about optimizations.
  • EstragonEstragon Posts: 2,773Registered Users ✭✭✭✭
    @jonr - yes, I could just run it during daytime hours. It sorta works out that way anyway, because we usually put stuff in and take stuff out to thaw during the day. I don't bother turning it off as it uses so little overnight.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
  • NANOcontrolNANOcontrol Posts: 76Registered Users ✭✭
    I run a chest fridge only during the day and only have a car battery for start surge. Temp is set close to freezing and cold is stored in liquid. Fridge only starts when battery is near full charge and times off after about 12 minutes.  Hot starts are prevented. Works even in rain and clouds.
  • SurfpathSurfpath Posts: 357Solar Expert ✭✭✭
    Like Mike, when it's super rainy and cloudy I turn off my (medium sized upright) fridge late at night. I kinda have to do this because I blew up my generator about 5 years ago and decided to not get a new one. 

    When my fridge was new it used 1.3 KWH/day, now it's up to 1.5kwh/d with a similar amount of stuff in it. I was thinking of putting a timer on it now, since my batteries are also getting on (6 years this November).

    I am trying to stretch another year of life from them.  We shall see.

     
    mike95490 said:

    I've got a timer set on my freezer, to get batteries through the night in severe winter cloudy conditions. Shuts it off from 4pm to 8am. In the garage where it's cold anyway, and shifts the freezer run time to daylight hours or times I run the genset. 
    In the summer, loads of sun and power - no problem

    Outback Flexpower 1 (FM80, VFX3048E-230v, Mate, FlexNetDC) 2,730watts of "Grid-type" PV, 370 AmpHrs Trojan RE-B's, Honda 2000 watt genny, 100% off grid.
  • BB.BB. Posts: 27,788Super Moderators admin
    If you are somebody who stores frozen food for 6 months or longer--Watch for freezer burn (freeze drying the food). "Large" temperature swings in the freezer can draw water vapor from the food and freeze on the plastic wrap/freezer coils and dry out the food.

    Ideally, you want to keep the food near 0F (or lower) for long term storage... Even going to 5-10F is enough to cut the storage life of your food in the deep freezer.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • softdownsoftdown Posts: 1,879Solar Expert ✭✭✭✭
    edited March 14 #16
    It is impossible to be a prepper and not keep food for for lengthy periods. Keeping it cool, dry, and dark helps a tremendous amount. Especially with foods that have oils in them....as so many do. I seen a batch of old food go bad quickly simply because I moved it to my bedroom thinking I would consume it quicker. Exposing the oils to temps over 70F? Bam.....went rancid in snack foods that were well beyond their expiration date but had been stored below 60F....I guess. 

    Ice crystals in the plastic bags will happen over time. To me, they look worse than they are. They seem to get drawn back in during the microwave process. Very little harm done unless one is a postmodern "snowflake".

    Part of the reason that I am a prepper malcontent..... There are a few dozens reasons to become a prepper. Yet it may be impossible to ever quit prepping unless the unlikely happens.....we quit living high off of debt and quit rattling the international saber 24/7. 

    I consider build an underground network at this point in time. Talk about falling off the really deep end. 

    A "fly on the wall/horse" has also "informed the internet" that I am a "spammer". News to me. Now I am pretty well blocked from the internet for most intents and purposes.  So I ordered a PS3 and  XBox with "8000 games". Got to occupy your time somehow.... Being almost broke with loads of time? Not what its cracked up to be.  Can't help but wonder what juicy spygear the "Five Eyes" will install on my newly ordered gaming boxes. Been " sitting" at the same Canadian post office for a couple days now. 
    First Bank:16 180 watt Grape Solar with  FM80 controller and 3648 Inverter....Fullriver 8D AGM solar batteries. Second Bank/MacGyver Special: 10 165(?) watt BP Solar with Renogy MPPT 40A controller/ and Xantrex C-35 PWM controller/ and Morningstar PWM controller...Cotek 24V PSW inverter....forklift and diesel locomotive batteries
  • TucsonAZTucsonAZ Posts: 136Solar Expert ✭✭
    I ran a 5.5cf freezer conversion for two months on my setup and while initially concerned found those concerns laughable in the end.  I was using about 250 watts per day on it with the temps set for like 28 degrees.  It did a fine job of frozen at the bottom and very cold but not frozen on the top.  The 12v fridges are costly and not EnergyStar rated so I saved power and money converting a chest freezer.  I bought this one for my current build:

    https://www.amazon.com/gp/product/B00L7QVT8S/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

    I didn't even have to add a temp controller as there was enough adjustment in the one on it to get it to function at my target temps. 

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