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Old 05-07-2018, 12:10 AM   #1
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Default What size of generator do I need?

Hi all, I'm looking for a generator for a screener/separator unit I'm putting together, and I'm not sure of what wattage to get. The screener is run with a baldor/reliance motor (3ph, 5hp, 1800 rpm, 60hz, 230/460v). I would also like to power a holiday trailer with some 120v electronics and two large 240v a/c units. It has a 50 amp cord, and seems to draw most of that amperage. I would never need to power both at once. Can you get generators that easily switch between 1 and 3 phase? The salesman I have spoken with recommended a 20 kw unit (wacker g25), but I'm feeling pretty ignorant right now, and fear he may be upselling me. Thanks
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Old 05-07-2018, 12:38 AM   #2
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Call an electrician.
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Old 05-07-2018, 02:04 AM   #3
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[QUOTE = Call an electrician. QUOTE]

Where can I find one ?

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Old 05-07-2018, 05:08 AM   #4
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Old 05-07-2018, 05:24 AM   #5
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Quote:
Originally Posted by adrienne2212 View Post
Hi all,
Hi Adrienne

Quote:
Originally Posted by adrienne2212 View Post
I'm looking for a generator for a screener/separator unit I'm putting together,
Cool. Panning for gold? I want half.

Quote:
Originally Posted by adrienne2212 View Post
and I'm not sure of what wattage to get.
Me either, yet. Let's keep reading.

Quote:
Originally Posted by adrienne2212 View Post
The screener is run with a baldor/reliance motor (3ph, 5hp, 1800 rpm, 60hz, 230/460v).
Ordinarily, that would put you around 12kw to make sure it starts, or a 10kw if you put it on a soft start. It's won't draw near that while it's running.

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Originally Posted by adrienne2212 View Post
I would also like to power a holiday trailer with some 120v electronics and two large 240v a/c units. It has a 50 amp cord, and seems to draw most of that amperage.
Yeah, they usually do. Particularly on hot days. That's puts you into a much larger generator. You're can get away with around a 6500kw if you remember to stagger start the a/c's, but something like a 12kw will give you the headroom you really need.

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Originally Posted by adrienne2212 View Post
I would never need to power both at once.
Good idea.

Quote:
Originally Posted by adrienne2212 View Post
Can you get generators that easily switch between 1 and 3 phase?
Um... if you have 3-phase you already have single phase.

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Originally Posted by adrienne2212 View Post
The salesman I have spoken with recommended a 20 kw unit (wacker g25), but I'm feeling pretty ignorant right now, and fear he may be upselling me.
Yeah, that's his job.

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Originally Posted by adrienne2212 View Post
Thanks.
You're welcome. Just be aware that a generator this size is probably going to burn a gallon or better an hour.
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