• @MrEff@lemmy.world
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    1721 year ago

    Looking passed the absolutely insane answer here, no one has even brought up the whole issue of AC vs DC. Batteries are DC, while your fridge that plugs into your wall running on AC. I know they make DC ones, but it isn’t like they are interchangeable.

    • themeatbridge
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      701 year ago

      Funny thing, most modern refrigerators use DC motors for their compressors so that they can run at variable speeds, so there’s likely an inverter that you could bypass if you know the appropriate voltage. The DC ones for RVs are the same internals, just without the inverter.

      • @DreadPotato@sopuli.xyz
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        151 year ago

        Funny thing, most modern refrigerators use DC motors for their compressors so that they can run at variable speeds

        No they don’t…they use AC motors and a VFD to control the speed.

      • @nixcamic@lemmy.world
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        1 year ago

        Correction: they still use AC motors, but those motors don’t use line AC. It goes line AC > rectifier > DC > inverter board > variable frequency AC to run the compressor motor.

        Most RV fridges just use DC motors, but there are some that use VFDs and AC motors.

      • Jojo
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        71 year ago

        I mean it’s probably labeled, right? How hard could it be?

        • themeatbridge
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          11 year ago

          Exactly. Find a hole that’s black and a hole that’s red, and stick some wires in there. How hard could it be?

          • Jojo
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            21 year ago

            (can’t answer, because she was fucking electrocuted)

    • @ColeSloth@discuss.tchncs.de
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      21 year ago

      That part just takes an inverter.

      I’m not sure of the max load output on a car battery, but with a 15 amp 1800 watt dc to ac inverter, you probably can run a fridge off one. It probably just won’t last all that long.

    • @tfw_no_toiletpaper@feddit.de
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      1 year ago

      There are DC-AC converters you can use (might be called inverters in English idk), which are pretty interesting circuits. They are used all the time, e.g. to use solar energy

  • @Worx@lemmynsfw.com
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    2031 year ago

    We know this comment by Shannon Martin is correct and sensible because it was reviewed by Shannon Martin! As a licensed insurance agent, I’m sure she is qualified to talk about uh… electronics… hmm

    • @frezik@midwest.social
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      311 year ago

      This is the sort of person who thinks you need to ground yourself to be safe while working with electricity. Not 100% wrong, but just wrong enough to be very, very dangerous.

      • Transporter Room 3
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        161 year ago

        Some people know just enough to be dangerous.

        For instance, an anecdote:

        A nearby local hardware store put up a sign in 2017 and now this year, in front of the welding equipment, that says “WELDING GOGGLES DO NOT PROTECT EYES AGAINST THE SUN”

        Now if they didn’t block uv from the sun, then they wouldn’t block uv from your welding arc.

        BUT I 100% stand by their choice to put the sign up.

        Because you need a certain shade or darker, and they sell a lot of different shades for different welding applications, including the safety tints people might want if they’re nearby and catch the occasional reflection.

        And some people know enough to know welding arc = UV, sun = uv, and don’t stop to think about intensity.

        In fact, in 2017, I knew someone who tried to use a #3 lense to look at the total eclipse, and as soon as the moon cleared moved enough for the sun to peek back, he deeply regretted not using a darker shade. Now has a weird spot in his vision that isn’t quite right.

        • @DoomsdaySprocket@lemmy.ca
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          31 year ago

          A 3 is what my helmet gives me for grinding mode, that’s nothing.

          I used a 10 or 11 for one eclipse and it worked alright.

      • @RobertoOberto@sh.itjust.works
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        31 year ago

        Working with small ESD-sensitive electronics and using a proper grounding strap and mat with large resistors in series to provide protection from shock? Absolutely.

        Wiring up a car battery or working with mains power? Absolutely not.

        • @frezik@midwest.social
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          21 year ago

          Car battery on its own won’t kill you, though wiring many in series might. There can also be some effects from DC sparks and welding on even 12V, which might cause other problems.

      • @nilloc@discuss.tchncs.de
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        51 year ago

        Just ground your left hand while you work on it with your right hand. That way if it’s live it’ll quickly stop your heart and you won’t even know you died. No half measures!

  • @Naz@sh.itjust.works
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    1 year ago

    Hello, expert solarpunk here.

    TLDR: Car battery is 350Wh. Fridge uses 143W idle, so it’ll run a fridge for 2-3 hours.

    Explanation below:

    Car batteries are lead-acid (sulphuric acid and lead plates).

    They discharge according to Peukert’s Law as the negatively charged plate gets covered in lead via the acid (electrolyte).

    As the battery depletes, the negative plate can begin to take permanent damage, and so you can’t discharge a lead-acid deeper than 10-20%, or about 10.8V, with the safe limit being ~50% discharge.

    Most 12V, 60Ah batteries therefore only safely store and nominally discharge 350 Wh @ 350W.

    You can discharge that as fast as you want but the faster you discharge, the lower the capacity is (with 1000-1500W bringing you way down to like 65 Wh). Fridges have a surge when they start up to fire up the compressor. Starter batteries can take that, but once the refrigerant is cold, the fridge just maintains the temperature which uses a lot less energy - about 143W on average.

    • @baru@lemmy.world
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      411 year ago

      Fridge uses 143W idle

      Isn’t that like 1250 kWh on an annual basis of idle usage? An efficient fridge should use 150-200 kWh per year, this isn’t just idle usage. Even an inefficient fridge would be really high with that kind of idle usage.

        • JohnEdwa
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          1 year ago

          Watt hours are watt hours. Sure the compressor won’t run on 12 volts as is but the energy is there, just needs a converter.

          Fwiw, our 15 year old fridge uses around 1000Wh per day.

          • @genie@lemmy.world
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            01 year ago

            Sure, buy an inverter and burn up 10% of your energy in the conversion if you’re lucky. That inverter will cost roughly as much as the contents of a standard fridge + freezer, by the way :)

            At that point just buy a well insulated cooler and always have some ice on hand. It’ll last much longer.

            • @John_McMurray@lemmy.world
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              51 year ago

              3500 watt inverter is 300 dollars at a Flying J. Mines 7 years old and was used 5 years straight when I was a trucker, as I removed the 12v factory fridge that could kill 4 batteries over night, with a 110v fridge, I could safely leave food in all my days off and the truck would still start. Now it’s hardwired to my pickup as a emergency generator and electric impact wrench power source. People laugh initially when they me pull out the impact and then ask what it cost. I also mounted a coffee maker behind the seat because gas station coffee is fucking garbage and its 4 hours to a major center

            • JohnEdwa
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              1 year ago

              The question wasn’t “Is it efficient or cheap”, it was how much energy is in a battery, and if and for how long would it run a fridge. If you also want to add one more point to why you probably shouldn’t do it, car starter batteries don’t generally like to be deeply discharged, you’d want to get a marine battery for that use.
              As for how much the inverter would cost, depends on the fridge, but Amazon has a 1000W inverter for around $85, that should be enough for most. Ours could run from a 300W one, they cost around $30. Pretty handy devices if you want to run any kinds of electronics from a car anyway, I have one for when I want to charge my laptop and RC batteries on the field.

        • @DogWater@lemmy.world
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          21 year ago

          No it doesn’t. Watts do give a shit what percentage is voltage vs amps. You have to convert between AC and DC as appropriate as well as ensuring the voltage of a 12v battery is stepped if needed, but the watts are the same in any case. (Not figuring for system losses)

            • @suodrazah@lemmy.world
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              61 year ago

              Your comment was ambiguous, stupid, and designed to ridicule. If you are attempting to imply inverter and other loss then be more specific. Regardless, the comment you were referring to already provides arbitrary values that you can assume include loss.

              So please explain to me what the fridge being 12v DC or mains AC powered has to do with anything, when an example uses arbitrary power and energy values? I’m genuinely curious.

              • @genie@lemmy.world
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                -91 year ago

                ooh getting aggressive now are we?

                I owe nothing to you. Enjoy your time being a sad person trying to bring others down on the internet :) I hope this little outlet makes you feel better

    • @Aux@lemmy.world
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      31 year ago

      You have a very inefficient fridge! My fridge is rated for 272 kWh per annum, which is 745 Wh per day or 24 Wh per hour. You need to buy a new fridge.

    • @HeckGazer@programming.dev
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      21 year ago

      You did not answer their question. They asked for Watts, not Watt hours. Average car batteries have a CCA in the range of 500 to 1000 Amps at 12V, so you could reasonably have 12kW in there :D

    • @drathvedro@lemm.ee
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      41 year ago

      Fridge uses 143W idle

      The only thing running in idle is the timer and power led, which consume insignificant amounts of power. By my calculations, the average modern fridge does bursts of ~300W during compression and defrosting cycles, with ~40-50W consumption on average over long periods.

    • Norgur
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      1 year ago

      One running on “Volts” and another running on “Watts” is like refusing to compare two cars because one car runs on Wheels and the other running on Motors

      • @theneverfox@pawb.social
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        21 year ago

        Well, you just have to convert wheels to motors. A car runs on wheels, which is 1/4 motors. A boat runs on motors, and has one, meaning it has 4 wheels and is probably street legal!

    • @dmtalon@infosec.pub
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      1 year ago

      A little more technical, I don’t think your average starting battery is 100ah capacity, and most don’t rate themselves in amp hours either.

      I bought a deep cycle for my little sailboat at the local auto store and it’s around 70-80ah

      You would need an inverter to convert the batteries DC (direct current) into AC (alternating current). This will “cost” some power (watts) to convert that voltage. Your refrigerator runs on AC battery outputs DC.

      That said, it is quite common to run refrigerators on larger boats and RVs off batteries and it would certainly be possible to run your house fridge off a single car battery for a short while if you’ve got an inverter large enough to run it.

      What your not gonna do is just run out to the car, grab your battery and hook it directly to your fridge.

      Our fridge uses between 130-180 watts when running and about 2.9Kw or 2900 watts in 24 hours. Your battery most likely has under 1000 total watt hours til empty, and car batteries are generally not used past 50% capacity (lead acid starting battery). So figure 500 watt hours max (for easy math). So… 4h run time maybe.

      • @Bumblefumble@lemm.ee
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        91 year ago

        In your last paragraph, most of the places you write watts you mean watt hours. Good reminder that Wh is a bad unit, since it’s too easy to confuse with watts.

      • @atrielienz@lemmy.world
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        21 year ago

        While it’s true that it won’t be at max capacity, I will say that batteries these days will rate themselves in amp hours. For instance usually an 800 CCA AGM battery lists itself online as 7.5 AH.

        The conversion process involves using the formula CCA = 7.2 x Ah to convert from Ah to CCA, and Ah = CCA / 7.2 to convert from CCA to Ah.

        • @dmtalon@infosec.pub
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          1 year ago

          I specifically looked at the available specs at the local auto parts stores and couldn’t find Ah details. This was about 2y ago, so maybe this value is becoming more commonplace. I know in the RV/Sailing works Ah is used pretty exclusively. My deep cycle AGM only lists CCA and reserve capacity

          • @atrielienz@lemmy.world
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            11 year ago

            With the rise in power banks and phones being rated in Amp Hours, I think this may be a recent change, and certainly one I have noticed.

    • LazaroFilm
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      321 year ago

      Watt and volt are two different measures for electricity. Also your fridge will not work when hooked up to a car battery for many other technical reasons, including differ t voltages, and current types (AC/CD, not the band)

      • @hddsx@lemmy.ca
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        221 year ago

        That’s wrong. Watt is a measure of power and volt measures…… voltage.

        Charge (electricity) is measured in Coloumbs (sp?)

        You need a complete circuit for Watts as P=iv.

        I is current, measured in amperes

            • @CLOTHESPlN@lemmy.world
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              91 year ago

              Another way to think of it is this: Volts are like water pressure (potential energy) Amperage is like the flow rate of water Ohms (resistance) is like how hard it is to push water from high pressure to low pressure Watts are like the volume of water (a unit of energy)

              A big hose has low resistance, water can move freely A coffee straw has large resistance, it’s hard to pull and push water thru it

              A river has very low water pressure, and the speed of the water can vary, so volume of water moving can be huge so the flow rate of water can be huge as well. A pressure washer might have very high pressure, but use as much water as a kitchen faucet. Certain applications need high pressure, some need low pressure. A car battery is like a river, low pressure (typically 12volts) but move a lot of amps (cold cranking amps of up to 500-600 ish usually), and a wall outlet by comparison is like a pressure washer with 120v, 15A (in the US). A fridge won’t play nice on 12v, it needs 120v. It might need 400 watts which a car battery can do but it cares about how it can get that by requiring higher potential.

              A watt, W=VA, can be thought of as asking how much water is there? 1 minute under a sink verse 1 minute in front a fire hose has two very very different amounts of water.

              A watt hour, which most people are familiar with in the US for billing on their utilities, is like asking how many cups of water an hour. A light bulb needs a fraction of a kilowatt hour, a drier needs multiple kilowatt hours, but might only run for 30 minutes.

              This idea gets a little tricky and falls apart at its edges but as a general idea should hold up for most peoples understanding of electrical stuff unless you work with it daily like an electrical engineer, electrician or something similar. For sanity sake I’m not going to try to apply this to AC verse DC, I don’t have a good analogy for that

              Obligatory mobile formatting heads-up and what not and I’m not caffeinated so meh

              • @hddsx@lemmy.ca
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                51 year ago

                Ugh, you’re getting into the realm in which technicality is hard to explain.

                That’s technically wrong. Even though ampere is coulomb/sec, electrons don’t actually flow.

                • @CLOTHESPlN@lemmy.world
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                  61 year ago

                  Like I said it falls apart on its edges but for most people it’s probably a better understanding of it than they will ever have or need, but most people scrolling thru Lemmy probably don’t need to be understanding electrical concepts like electrons not actually flowing, charge, etc. I’m a controls engineer and while I am aware of the concepts and such, I am not designing electronics so at the end of the day I barely have a use for half of the concepts myself. Sure I could get down to the half semester class of quantum where things get weird, but that won’t easily tell people to not to try to plug their fridge into a car battery

              • @FilterItOut@thelemmy.club
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                41 year ago

                For the AC/DC part, I usually try to tell people it’s like a water wheel that’s been inserted into the hose of water. DC is it spinning one way constantly, while AC is it spinning back and forth. The wheel is turning pretty much the whole time (again, we can try to not be super specific with the way we do phases with AC), and thus you can use it to do stuff on AC or DC.

                • @CLOTHESPlN@lemmy.world
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                  41 year ago

                  Clever, it just breaks down again with my analog of water volume lol. Definitely not saying it’s wrong, I just like to leave it off so there are less questions haha

        • @Serinus@lemmy.world
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          31 year ago

          With the river analogy, Voltage = pressure, Wattage = how much water is passing, Current (Amps) is how wide the river is.

          Pressure * Width of river = Amount of water passing

          Not sure that helps with passing it through the terms and then to variables.

          • @Malfeasant@lemmy.world
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            31 year ago

            Water analogy works better with plumbing. A river, not so much. But people aren’t that much better at understanding plumbing, unfortunately…

        • LazaroFilm
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          131 year ago

          Sure you can use the 12v battery and convert that power but you can’t just connect a 12v battery and expect it to work.

          • @teegus@sh.itjust.works
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            1 year ago

            You stated that you cant connect a car battery to a fridge. You said nothing in your comment about 12v. I can connect my car battery to my fridge no problem.

            • LazaroFilm
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              1 year ago

              You can but it won’t keep your fridge cold. (Unless you use an inverter and you would need to check the amps needed by the fridge when the pump is on and see if your battery and inverter can provide that.)

      • @Diplomjodler@feddit.de
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        61 year ago

        Unless you have an electric car that can do vehicle to load. That means that you can plug in regular household devices like your fridge.

    • TXL
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      1 year ago

      Almost every sentence. But funny self review and other things aside, main problems:

      “Watts… Contains.” Is a fundamental confusion on what a watt is. It’s like asking how much fast there is in a box.

      The answer has a good basic idea, but also a total comprehension failure not just pulling the numbers out of thin air, but badly describing an equation with watts on one side and watt hours on another. The answer is both ignoring realities and getting the hypotheticals wrong. Sounds expertish but is both wrong and useless.

      When they could have just said “yes, you could use a suitable inverter with a suitable battery and a fridge in some cases, but the math and actual connections would be more complicated than that explanation” or something like that.

    • r00ty
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      51 year ago

      I mean, the running on watts vs volts part was nonsense.

      But, did get quite close with the power calculation. Although here in the UK the average car battery seems to be around 60ah. I did see some very expensive large 105ah batteries. But they were definitely the outlier. So if you had a 100ah battery then it would be 1.2kwh with 100% efficiency.

      Also, it doesn’t mention that you’d need an inverter to make the fridge run from a battery. These also have inefficiencies which would reduce the runtime on the battery.

      • downhomechunk
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        11 year ago

        Was about to say inverter until I saw your comment. I think the robot meant to call out AC vs DC.

      • @Malfeasant@lemmy.world
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        11 year ago

        These also have inefficiencies which would reduce the runtime on the battery.

        Not wrong, but the efficiency of inverters is really high, loss is just about negligible.

  • IndiBrony
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    491 year ago

    Now I don’t know enough about electronics to know how wrong this is, but I do know enough about electronics to know that this absolutely sounds wrong.

    The problem comes when someone takes an answer like this, knowing far less than I do, and they try and hook up their fridge to a car battery.

    And this is why I hate LLMs. Being confidently wrong is scary enough when it’s just people, nevermind technology.

    It does make me chuckle, though, that Skynet could have been totally innocent in their destruction of the human race, they just confidently came to the wrong conclusion and had the tools to carry it out.

    Like a toddler whose inner thoughts are telling him to throw a cat out of the window. He doesn’t know he’s going to kill it, he just knows that’s what his brain is telling him to do.

    • @genie@lemmy.world
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      Now I don’t know enough about electronics to know how wrong this is

      Very, assuming the refrigerator in question typically runs on a typical power grid you’d find in the US or Europe (source: am electrical engineer)

      Mainly because most compressors I’m aware of use alternating current (AC) motors, or at a minimum accept AC power. Batteries alone produce direct current (DC). The simplest way to make this work would involve an inverter (converts DC to AC). Cheap ones probably have at least a 10% conversion loss, so you’re looking at an hour or two at most.

      Edit: should also mention that discharging a typical lead-acid battery until it’s all the way flat (realistically below ~11V) does irreparable damage. Might be cheaper to replace the contents of your fridge :)

    • @xantoxis@lemmy.world
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      41 year ago

      From a technical stance, it’s right. This top comment does the math pretty well, and I’ve done it myself recently trying to decide if I should add a battery backup on my fridge. If you can overcome the startup surge (and a car battery definitely can), a modern fridge doesn’t draw very much power.

      Of course, there’s a lot of details missing about how you do this without dying of electrocution. So I think it’s also a fair criticism of the LLM.

  • @Gobbel2000@feddit.de
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    481 year ago

    While reading the question I thought: “That’s not how Watts work”, but then this “answer” hit…

  • @SoleInvictus@lemmy.world
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    1 year ago

    I looked up the page and it gets worse.

    You will need to shop for a car inverter. Find one that is at least 1,500 watts, and it will help you power your refrigerator for up to five hours—usually without damaging your car battery. Considering how much food we keep in our refrigerators, a $200 car inverter is a bargain!

    • @nixcamic@lemmy.world
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      1 year ago

      I mean that’s the least wrong part imo. I’ve ran a fridge off of a car battery and if it starts cold you can go a lot longer than that.

    • @Dultas@lemmy.world
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      91 year ago

      Or spend twice that and get a cheap generator that will actually power your frig and other stuff for more than a few hours.

      • pachrist
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        41 year ago

        Nah, it’s definitely easier during a tornado to go outside, jack up my car, remove the wheel, remove the wheel liner, and then pull the battery from inside the bumper because that’s a really convenient place to keep a car battery. Then I just have to lug the battery inside, hook it up, and keep 2 small children and 3 dogs away from it. Much easier than a generator.

  • @Zink@programming.dev
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    371 year ago

    That answer is like the electronics version of the image with Patrick Stewart and the caption:

    “Use the force, Harry

    -Gandalf”