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Author Topic: 4k rectifier A.C. question Jonathan Bodge Film Handler Posts: 83 From: East Dorset, VT Registered: Nov 2006 posted 04-29-2013 02:18 PM                     Does anyone know how much (with single phase 220) amperage a rectifier would draw for a 4000 watt bulb? Or, is 3 phase the only option with this high wattage bulb. Thanks!  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 04-29-2013 04:55 PM                        Unless you find a switcher, you are looking at 3 phase. It is possible to strap 2-2000 watt units in parallel for 4k. If you lose one, you are likely to lose the other since it is then overloaded a bit. 3-2000 watt units works better. I use Strong high reactance rectifiers: Each: 30 amps/230volt. Louis  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 04-29-2013 05:43 PM                     I know of a couple of theatres here in SF that are running 3phase rectifiers (power supplies) on single phase by using a bank of large capacitors to create a 'phantom' 3rd phase. You can find info on how to do this online. They're lamps are only 2K though. But I assume if you had large enough capacitors, you could go higher. There are some trade-offs though. You won't be able to get full rated power output, due to efficiency losses. - - and the rectifier makes a very loud annoying buzz at about 120hz, which might be a problem if your booth isn't too soundproof. But they've been running with this arrangement for over 20 years.  |  IP: Logged

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