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Posted by Bill Farnsworth on 06/07/07 15:27
"Bernie Dwyer" <b_duibhirz@yahooz.comz.auz> wrote in message
news:46679C76.6B5C1C52@yahooz.comz.auz...
> Hi - are there any sparkies (electricians) here?
>
> I'm shooting some rainforest scenes in a couple of weeks and I will
> need
> suitable lighting.
>
> I've worked out the loads and want to confirm that I'm hiring a
> suitable
> 3-phase generator. Here's the details:
>
> All voltages are Australian, i.e. 240VAC, 50Hz. All calculations
> rounded
> up for a safety margin.
>
> Phase 1: unit/makeup. Small lights, airbrush compressors, hot water
> jug,
> etc. Total 14 amps
>
> Phase 2: lights on set, total 29 amps
>
> Phase 3: lights on set, camera power, field monitor, smoke machine,
> etc.
> Total 30 amps
>
> By my calculations, this comes to 17.52 KW of mostly resistive load,
> so
> no power factor to worry about.
>
> I can get a 20KVa generator for a reasonable price, and this would
> seem
> to fit the bill. 17.52 KW shouldn't stress a 20KVa generator. I want
> to
> leave a bit of a reserve. The next one up is a 60KVa generator, and
> it
> costs a lot more.
>
> Any opinions?
>
> (duh, this is the interweb, there'll be opinions, count on it:-)
>
> --
>
> Bernie Dwyer
I am a bit confused.
You show three phases.
Are you using a three phase generator?
If you are, I think you are a wee bit on the low side considering that
generator advertised power is generally peak power, not continuous
power.
Check with the rental company to see if your calculations match up to
the continuous power rating of the generator.
Regards,
Bill Farnsworth
www.billfarnsworthvideo.com
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