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Solar/ Battery cable (to sockets) specification please.

Discussion in 'Power Electronics' started by Ian Wallis, Feb 8, 2021.

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  1. Ian Wallis

    Ian Wallis

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    Nov 13, 2017
    Hello, I'm about to buy 14 meters (from battery house to lounge tv) of 25mm or 35mm cable, and I need to know what specs they should be to comply with household regs.
    There are a lot of cables out there with junk written down the sides and some with out. I just want to get it correct while I have the floor up.

    I'm only planning to use about 15amps for about 8 hours, from my four 225ah batteries. It may look like overkill but things have a habit of changing.
     
  2. WHONOES

    WHONOES

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    May 20, 2017
    Before anything else is discussed, you absolutely must without fail put a fuse or fast circuit breaker at the battery end of your wiring. The reason being the batteries you are proposing to use will quite literally deliver thousands of amps into your wiring. If your wiring should encounter a short circuit, would have a fire on you hands presumably under your floor boards in seconds. To do otherwise is courting disaster.

    I would advise that you buy yourself a copy of the current Reg's.

    See link below

    Amazon.co.uk : electrical installation regulations
     
    Harald Kapp likes this.
  3. Ian Wallis

    Ian Wallis

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    Nov 13, 2017
    Yes, thank you for your recommendation.
    I will of course be fitting an isolation switch (which I have) and a master fuse (I think it was 30, or 40amp, can't remember), and then a baby fuse box for secondary fuses. One fuse for each spur, which I shall rate just a bit above the estimated amperage that the spur will using. Start at 15 and if it keeps popping go up to 20amp. Each item that I will be using (laptop, satellite receiver etc) will have it's own fuse.

    Your reaction to the battery bank power is puzzling though; I thought that 225ah batteries was a small to mediocre size in the deep cycle battery world of the off gridders. :)

    Thank you for the link.
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,423
    2,620
    Nov 17, 2011
    225 Ah may be small, but this type of battery can nevertheless deliver loads of amperes into a short circuit. Have a look at this video (just an example).
     
  5. WHONOES

    WHONOES

    1,124
    311
    May 20, 2017
    An ordinary 12V car battery is capable of delivering close to a 1000A into a load. They need to as starter motors typically run at several hundred amps. Your 225AH battery is probably 3 times what you would encounter in a car an will deliver a proportionately larger current. If you are using multiple batteries the problem is compounded.
     
  6. Ian Wallis

    Ian Wallis

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    Nov 13, 2017
    Love that video, it reminds me of a guy fixing his motorbike by pouring nuts and bolts in to its engine like it was oil. Yep, it happened.
    TechTips, lol, I'll have to subscribe ha ha.
     
  7. Ian Wallis

    Ian Wallis

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    Nov 13, 2017
    I really don't know what the answer is, other than keeping it under control. Like a gas cooker, we control the gas from exploding.
    It's just the nature of the beast. Just don't let the beast out of it's cage :)
    I wont be going to Youtube for advice anytime soon :)

    Thank you for your advice, I appreciate it.
     
  8. Ian Wallis

    Ian Wallis

    23
    0
    Nov 13, 2017
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