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[Solved] Choosing Cable Cross-Section for 12V DC, 8A Car Fridge: Installation Distance of 120m

mlewan 25137 44
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #31 17827466
    CYRUS2
    Level 43  
    Szyszkownik Kilkujadek wrote:
    distance of 120 meters, now be careful: You need a cable with a minimum cross-section of 25mm2.
    You had a good feel.
    But .... use 2 x 25mm2 aluminum conductor (or cable)
    Price approx. PLN 4 / m gross.

    You also have to pay for the 2 x 4mm2 Cu conductor - about PLN 4 / m gross.
    For this additional converters - you have to pay.
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    #32 17827508
    ptero
    Level 24  
    Hello all.
    First, give a transformer of 230/24, power 160-200VA. 2x6mm2 or 2x4mm2 cable. At the end, next to the refrigerator, a bridge with a capacitor and a step up / step down converter - 2.5-30V / 12V 10-15A, I once bought one on Ali for a solar panel. Even with a voltage drop of a few volts, it can handle it. There is a Peltier module in the refrigerator, which has a fairly wide operating range.
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    #33 17827807
    CYRUS2
    Level 43  
    Can a colleague calculate what will be the cost?
    ptero wrote:
    At the end, a bridge with a condenser next to the refrigerator.
    Such "bungling" as a colleague suggests in a public facility is not acceptable.
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  • #34 17827831
    Szyszkownik Kilkujadek
    Level 37  
    Maybe let's wait for the author with further discussion? :-D
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    #35 17828268
    ptero
    Level 24  
    CYRUS2 wrote:
    Such "bungling" as a colleague suggests in a public facility is not acceptable.


    Yeh, in fact, bungling. But it can be done "professionally" :)
    After all, it's just a loose idea, not a ready-made solution ...
  • Helpful post
    #36 17828581
    William Bonawentura
    Level 34  
    It may also turn out that, for example, the most sensible solution will be to freeze ice at home and bring it to the refrigerator without any power supply. Until the author writes more precisely what he wants to achieve, further prompting is probably pointless.
  • #37 17828587
    alekt77
    Level 40  
    Szyszkownik Kilkujadek wrote:
    Maybe let's wait for the author with further discussion?

    The author of the topic seems to have been effectively discouraged by such a wealth of good advice ;-)
  • Helpful post
    #38 17828913
    CYRUS2
    Level 43  
    ptero wrote:
    Yeh, in fact, bungling. But it can be done "professionally"
    You cannot, there are no such ready-made devices.
    The author got realizable solutions in posts # 15 and # 31.
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    #39 17829456
    Strumien swiadomosci swia
    Level 43  
    The main question is how much it gets at start-up.
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    #40 17829539
    kortyleski
    Level 43  
    The fact that there are no ready solutions does not mean that you cannot implement something new. The condition is proper execution and as-built documentation that will enable subsequent service.
    But the simplest solution will be two large batteries, a charger and a cart. 8A for 10h is 80Ah. For the comfort of the 110Ah battery. No cables, safe.
  • Helpful post
    #41 17829739
    endi1940
    Level 11  
    I suspect that the refrigerator has something like a thermostat and does not work all the time. One large (about 110ah) gel battery is enough, more resistant to cyclic operation. For this low battery alarm, just in case - there are ready for 12 volt batteries. It works as a source during the day and recharges at night. Possibly 2 Batteries to work in shifts. It is not the ultimate in comfort, but an alternative to cables and converters. It can be more expensive in terms of price.
  • Helpful post
    #42 17829816
    Strumien swiadomosci swia
    Level 43  
    mlewan wrote:
    I take the power supply from 230 V AC, the problem is that it is a wet environment where a lot of people hang around (swimming pool). There is a place to lay the cable, but generally wet and a lot of people. If no construction works are to be carried out (and they are not), only safe voltage is involved.

    And I wonder why you need a fridge at the pool, install it in the changing room or.
  • Helpful post
    #43 17830035
    kortyleski
    Level 43  
    Strumien swiadomosci swia wrote:
    I wonder why you need a fridge at the pool,

    So that the customers of the pool have cold ones at hand, not in the changing room. I was making a whole booth in the pools. It was just a ride.
  • #44 17833942
    Szyszkownik Kilkujadek
    Level 37  
    CYRUS2 wrote:
    The author got realizable solutions in posts # 15 and # 31.

    What a modesty. :-D
  • #45 17836293
    mlewan
    Level 20  
    Dear colleagues :)

    Thank you for the hints and solutions, increasing the voltage to 30 V solves the problem. Let me close the topic.

    greetings :)

    Added after 1 [minutes]:

    The problem was solved by increasing the voltage to 30 V, which allowed the use of a cable cross-section of an acceptable size.
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Topic summary

The discussion revolves around selecting the appropriate cable cross-section for a 12V DC car fridge drawing 8A over a distance of 120m. Key considerations include voltage drop calculations, with recommendations ranging from 6mm² to 25mm² depending on the voltage at the source and the acceptable voltage drop at the fridge. The use of a higher voltage (up to 30V) at the beginning of the cable is suggested to minimize losses, allowing for a smaller cable size. Various solutions are proposed, including using a step-down converter at the fridge and considering alternative power sources like batteries or gas-powered refrigerators. The importance of safety in a wet environment is emphasized, along with the need for proper installation practices.
Summary generated by the language model.
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