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Will 300w power inverter blew the fuse?

Discussion in 'General Electronics Chat' started by Carolie, Nov 10, 2017.

  1. Carolie

    Carolie New Member

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    I have a 300W power inverter, can I plug it into my car cigarette holder? Someone says that it will blew the fuse if the power inverter is over 200W, is that right ?
     
  2. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Mine is fused at 10A (it says so on the front), which is only 120W - but as long as you're not drawing too much power from your inverter you 'might' be OK. Try it and see - what are you trying to power from it?.
     
  3. crutschow

    crutschow Well-Known Member Most Helpful Member

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    Depends upon the size of the cigarette lighter fuse.
     
  4. dave

    Dave New Member

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  5. alec_t

    alec_t Well-Known Member Most Helpful Member

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    Since car manufacturers design cost out of cars, I doubt the cig lighter wiring would be rated for prolonged use at the 30A which your inverter would need :(.
     
  6. dr pepper

    dr pepper Well-Known Member Most Helpful Member

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    To get the full power you could either put croc clips on the inverter and connect it direct to the battery via a fuse of course, or if you need to use the inverter while moving put another socket in the car capable of supplying it.
     
  7. tcmtech

    tcmtech Well-Known Member Most Helpful Member

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    The efficiency of the inverter and the total load will determine how much power you can pull but typically a automotive cigarette lighter or power port socket is good for about 100 usable watts at the end given they typically have a 10 amp fuse and that type of socket and plug system is not designed to handle more than that in good working conditions.

    I know of many who put larger fuses in so that they could get more power only to end up with burned out sockets or melted plugs for their efforts.

    As for powering an unloaded inverter I have ran 750 - 1000 watt rated inverters off of such power ports many times, given the actual inverters idle currents were quite low, so your 300 watt unit will likely run just fine until your load passes whatever limit the fuse sets for the system.
     
  8. dr pepper

    dr pepper Well-Known Member Most Helpful Member

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    Also beware that the average lighter plug will only take a few amps, there are some heavy duty ones that will take 15 - 20 amps.
     

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