How much power do I need

Discussion in 'Motorhome Chat' started by Wildman, Jul 16, 2013.

  1. Wildman

    Wildman Read Only Funster

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    How much power is a commonly asked question, when running via an inverter the power required is double that listed to allow for startup current on a lot of things.
    The number of amps drawn from your battery is W(atts) divided by V(olts in this case 12V)
    [​IMG]
    I hope the table is useful in answering some questions. As your batteries are given as amp/hrs the battery capacity divided by answer from the above will tell you how long a particular applience will run from your battery but do remember batteries should only be used down to 50% so a 110amp/hr battery has a useful charge of 55amp/hours
     
    Last edited: Jul 16, 2013
  2. cmcardle75

    cmcardle75 Read Only Funster

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    I'd ignore the figures for any electronics. They appear to be circa-1990. 500W for a TV? Really? A typical 32" TV these days takes about 40W. The 800W for a desktop computer would be more like 200W these days, unless it is a high end gaming machine. 50W for a radio is pretty spectacular, unless it had a built in heater. 2W might be more normal, unless you like it loud.
     
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  3. pappajohn

    pappajohn Funster Life Member

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    was thinking the same thing myself.
     
  4. BritStops

    BritStops Trader BritStop Owner

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    Well, there you go!

    Thanks to Wildman for posting it though, as it did lead to some more up-to-date figures. :thumb:

    I don't suppose anyone's got a similar chart that's more current*, then?

    Steve :Smile:

    *pun unintended, but I like it anyway
     
  5. BwB

    BwB Funster Life Member

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  6. BritStops

    BritStops Trader BritStop Owner

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    Interesting! Looking at the list though, I reckon (apart from LED lighting and the water pump) we only use a laptop, 15" TV and a travel DVD out of that lot.

    Can't imagine anyone using anything off the DIY list in their van while away.

    *stands back in anticipation of the next post being someone who trims hedges regularly when travellling*

    Steve :Smile:
     
  7. thehutchies

    thehutchies Funster

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    :Laughing:

    As I posted recently we have (on the entertainments side):

    Nintendo Wii.
    Xbox.
    Xbox 360.
    Two Playstation Portables.
    Flat screen TV.
    Two laptops and a desktop PC.
    Various tablets and smartphones.
    Washing machine and spindrier.
    Macerator to empty 350 litres of waste every ten days or so.

    Then we have, on the DIY side,:

    Angle grinder
    Electric saw
    Air compressor and tools
    Hammer drill
    And much more

    There are even the Christmas tree and fairy lights in a locker somewhere. :Smile:
     
    Last edited: Jul 16, 2013
  8. BritStops

    BritStops Trader BritStop Owner

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    I guess that's only to be expected from someone who by their own admission drives a "wheeled shed" :Laughing:

    Steve :Smile:
     
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  9. thehutchies

    thehutchies Funster

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    'The Wheelèd Shed', in fact.

    The grave accent makes all the difference :BigGrin:
     
  10. BritStops

    BritStops Trader BritStop Owner

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    If a grave accent is anything like a Scottish one, that'll be a Wee Lead Shed then?


    Steve :Smile:

    I'll get me coat...
     
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