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Load balancing


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#1 Rob McGreevy

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Posted 14 August 2014 - 12:48 PM

Here's something I've been wondering about...during my days working at a rental house I was always told that when it came to balancing loads on a generator, no more than 50 amps apart was recommended - that came straight from the genny manufacturers we dealt with. I never questioned it and have always applied that formula anytime I've been in charge of a generator on set.

 

That being said, I've worked a number of big shows with genny ops, and I've noticed that they don't seem to apply that same formula - for example, there have been times when we would have only an Arrimax up on lines 1 and 2, and absolutely nothing on 3, and they never seem to think that that's a concern. The frequently don't even bother to let us know we need to balance until we're over 100 amps apart. I figure the genny ops know what they're doing, do they know something I don't? These are different gennies, typically bigger tractor mounted plants...is that the difference?

 

I'm working as a best boy on a feature right now with a Litepower 500 amp, just want to make sure I'm doing the right thing - Guy Holt, would love to hear your feedback if you're around.


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#2 Edward Lawrence Conley III

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Posted 15 August 2014 - 08:41 PM

For the Arrimax- not a big deal and not a big hit for the 1200amp Tractor genny. But as you're thinking.. just because they do it doesn't mean it is a good idea in all situations.

 

Balancing loads is also keeping an eye on the Neutral return. Again with the Arrimax- since it is 240v there is nothing on the Neutral anyway.


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#3 timHealy

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Posted 06 September 2014 - 10:45 PM

That's assuming you are using single phase and not three phase.

 

Best

 

Tim


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