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Thread: Size of Generator needed

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    Default Size of Generator needed

    What size of genset would I need to run a 12 foot shelter with 18,000 BTU/HR air conditioner and lights and all. Thanks

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    Chief and Indian 155mm's Avatar
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    Is it a military shelter prewired? If yes, what is thesize of the main breaker?
    "Artillery Brings Dignity to What Would Otherwise Be Just A Vulgar Brawl"

    "Happiness Is A Belt-Fed Weapon"

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    Yes prewired has a small panel but no main breaker. 100 amp panel I think. It was made as a Dental LaboratoryIMG_2134.jpg
    Last edited by staker; 10-22-2019 at 20:19.

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    Chief and Indian 155mm's Avatar
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    Photo the breakers and post
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    Chief and Indian 155mm's Avatar
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    Thats only single ph 240, so 10kw is max
    "Artillery Brings Dignity to What Would Otherwise Be Just A Vulgar Brawl"

    "Happiness Is A Belt-Fed Weapon"

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    Ok thanks alot.

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    Quote Originally Posted by staker View Post
    Ok thanks alot.
    How much stuff do you plan on running at once?

    10kW is generally plenty/overkill for a largish house. For 18,000BTU AC and some lights I doubt very seriously you'll need that much.

    Count up the amps of the largest combination of things you plan to ever have on all at the same time....

    Edit to add example -

    An 18,000BTU AC may draw from 12-20 amps of 120v single phase AC current, depending on efficiency. Assume 20 amps just for purposes of discussion. That's 2.4kW. Running ten 100Watt incandescent bulbs adds another kW (3.4kW total). With all this on and running, want to run a power tool? Say an angle grinder? Maybe another 11 amps (1.3kW) for 4.7kW total.

    I'm betting the lights are not incandescent. If they're LED this will take off almost all your lighting load. (If they're incandescent change them to LED and save thousands on genset cost)

    Even without load management a 5kW MEP802 covers everything easily....
    Last edited by 98G; 10-22-2019 at 21:50.

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    Thanks. I could probably get away with less as don't need air conditioner this time of year. Was thinking 3kw

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    Howdy,

    Since it was military, look at what the wire plug looks like. That should have a sticker nearby, or the type of plug, and how many wires are there.
    ~~Later Mike

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