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UPS for a fridge?

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  1. #1

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    UPS for a fridge?

    Need to get a UPS for a fridge. Enough to cover 12 hours outage.

    Most of the UPS's for PC's have lots of outlets. Just need one inlet and one outlet - Just need to keep the fridge going

    Any recommendations?


  2. #2

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    For just 12h I would bring the freezer to max freezing and the fridge to just above 0C - and maybe move an icepack from the freezer to the fridge after halftime.


  3. #3

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    Quote Originally Posted by flameproof
    For just 12h I would bring the freezer to max freezing and the fridge to just above 0C - and maybe move an icepack from the freezer to the fridge after halftime.
    For un-planned outages not pre-planned outages.

  4. #4

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    Generator is going to be your best option. Smaller UPS systems aren't designed to be connected to inductive loads (think motors, like the compressor in a fridge/freezer). Reason being the spike in current draw the motor pulls when it switches the compressor on. Larger (3-phase) UPS systems are better at that but even then for the amount of time you need it to run on battery power it makes more sense to look at a generator.

  5. #5

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    Quote Originally Posted by nateliv
    Generator is going to be your best option. Smaller UPS systems aren't designed to be connected to inductive loads (think motors, like the compressor in a fridge/freezer). Reason being the spike in current draw the motor pulls when it switches the compressor on. Larger (3-phase) UPS systems are better at that but even then for the amount of time you need it to run on battery power it makes more sense to look at a generator.
    No where to put a generator hence the UPS request.


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    Can a Tesla powerwall be adapted as a UPS?

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  7. #7

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    Quote Originally Posted by shri
    Can a Tesla powerwall be adapted as a UPS?
    Isn't it just a big UPS with a fancy outer shell and a daft name?

  8. #8

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    Quote Originally Posted by East_coast
    Need to get a UPS for a fridge. Enough to cover 12 hours outage.

    Most of the UPS's for PC's have lots of outlets. Just need one inlet and one outlet - Just need to keep the fridge going

    Any recommendations?
    Is this for personal use or commercial? Because if it's at home, something that can run a fridge for 12 hours is going to be in the vicinity of 12K from a quick Google. That's not taking into account considerations sizing for about inrush current and proper sine waves. You've also got to factor in occasional battery replacements (expensive and a pain in the ass, UPS batteries are heavy and a pain to dispose of).

    For personal use, it might make sense to just dump the food if the fridge stops working.

    Number of outlets is the least of your concerns... not sure why it's mentioned?

    (Disclaimer: this is guesswork, I have never had to seriously think about UPSes.)

    https://www.apc.com/shop/us/en/tools/ups_selector

    Edited to add: That Tesla thing is not a typical UPS. It's based on lilthiums for starters, which should have completely different max amperage characteristics to lead acid.
    Last edited by jgl; 10-12-2018 at 08:42 AM.
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  9. #9

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    Quote Originally Posted by jgl
    Is this for personal use or commercial? Because if it's at home, something that can run a fridge for 12 hours is going to be in the vicinity of 12K from a quick Google. That's not taking into account considerations sizing for about inrush current and proper sine waves. You've also got to factor in occasional battery replacements (expensive and a pain in the ass, UPS batteries are heavy and a pain to dispose of).

    For personal use, it might make sense to just dump the food if the fridge stops working.

    Number of outlets is the least of your concerns... not sure why it's mentioned?

    (Disclaimer: this is guesswork, I have never had to seriously think about UPSes.)

    https://www.apc.com/shop/us/en/tools/ups_selector
    Personal use and not worried about getting a new pint of milk but other items in the fridge are worth a lot more so need to ensure they stay cool.

    Modern inverter fridges hopefully don't have too big a start load but too lazy to work it out and was hoping someone with UPS knowledge would know a little more


  10. #10

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    Quote Originally Posted by East_coast
    Isn't it just a big UPS with a fancy outer shell and a daft name?
    Yes, but more suitable for handling surge requirements of fridges etc? Most UPS that I've seen, actually all are for IT equipment.

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