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Information - Battery loading in car: power inverter

Discussion in 'Kit / Clothing / Equipment' started by The Franconian, Jul 30, 2015.

  1. The Franconian

    The Franconian 28DL Regular User
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    I thought maybe some people don't even know that this exists, so I post it as an info here:
    Bought me a power inverter 12 to 230 volts, to be able to charge my camera batteries or phone when on tour.
    My inverter is using the cigarette lighter socket, stronger ones need to be connected directly to car battery I think.
     

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  2. Coxieboy

    Coxieboy 28DL Full Member
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    Er... that's connected to the car battery. Unless you are aware about electronics (Ohms law and stuff) stick to the cigar lighter. You could knacker your battery or cars electrics.
     
  3. Oxygen Thief

    Oxygen Thief Admin
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    I've used some big-ass inverters for running computers and GPRS kit straight from the cig socket.
     
  4. Bellman

    Bellman 28DL Full Member
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    Yes your correct, the more powefull inverters ie 1000 are better connected directly to the battery, thats why they have clamps instead of a cigerette lighter plug. I have known the cigarette lighter fuse to blow, or worse wiring can burn out.
     
    #4 Bellman, Jul 30, 2015
    Last edited: Jul 30, 2015
  5. The Franconian

    The Franconian 28DL Regular User
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    My one is good for 75W and I think this is enough for my needs.
     
  6. Maniac

    Maniac rebmeM LD82
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    You can draw around 200 watts of power from a cigarette lighter socket. @ 230v that's about .6 of an amp, enough to run a few chargers etc. without a problem. If you do the maths that's just under 16-17 amps of power at 12v and most car cigarette lighters are fused at 20 amps. I can tell you thou, draw that much power for a sustained period on your cars loom and it will get a bit warm which is why you'll rarely find an inverter that's more than 150w to plug into your cigarette lighter, anything more powerful should definitely be wired directly to the battery terminals. Do note if you have a powerful inverter that you're intending to run high powered equipment from, it's unlikely your alternator will be able to keep pace with the rate you're draining the battery at and run the car and the inverter, so you will find your battery gradually runs flat. You also stand a risk of knackering your alternator through overloading it, I've done it myself before.

    It's worth noting that inverters are not particularly good for running electronics as the cheaper ones use a modified sine wave which can cause issues with certain transformers and electronics. Saying that I've never had a problem, but I know people that have. It's also worth noting your 230v circuit coming from the inverter does not have an earth, so you should only use double insulated equipment (most chargers etc. are, but some laptop power supplies are not!) again the potential risk is low, but there is stil a risk.

    @Bigjobs has the daddy of all inverters in the limo, it's a beast!
     
    #6 Maniac, Jul 30, 2015
    Last edited: Jul 30, 2015
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  7. The Franconian

    The Franconian 28DL Regular User
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    ok peoples, you see it ain't always as easy as it looks
    follow me to my next thread about car fire extinguishers, please
     
  8. Bigjobs

    Bigjobs Official Smartarse
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    My lab quality pure sine jobbie rocks, although I have to connect it to the battery with 25mm cable.
     
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  9. FreshFingers

    FreshFingers Choose life, choose tunnels
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    Whilst on the topic of electricity, is that a serious case of HV arc burn @Coxieboy ? :eek:
     
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