Thanks Max, It turns out that the over simplified line in the catalog 1000w/1500VA has to do with the company calim of providing that wattage on a 1500VA draw. it is a battery back up. I am glad it's not my project. Thanks again.
On Tue, 31 Jul 2007, Max Robinson wrote: > Volts times Amps isn't necessarily watts in AC circuits. It has to do with > the phase relationship of the voltage and current. If they are exactly in > phase then volts times amps is watts. But if they are out of phase the > watts are less than volts times amps. How much less depends on how far the > current and voltage are out of phase. Airconditioners are nearly always > inductive loads which makes the current and voltage out of phase. The wire > size and circuit breaker have to be rated for the volt amps not the watts. > The horse power of a motor is related to the watts. > > Regards. > > Max. K 4 O D S. > > Email: [EMAIL PROTECTED] > > Transistor site http://www.funwithtransistors.net > Vacuum tube site: http://www.funwithtubes.net > Music site: http://www.maxsmusicplace.com > > To subscribe to the fun with tubes group send an email to, > [EMAIL PROTECTED] > > ----- Original Message ----- > From: <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Monday, July 30, 2007 11:16 PM > Subject: [BlindHandyMan] watts vs VA > > >> Hi, >> My electrical math is shallow. >> But I thought, that volt times amp will give you a number equalling the >> amount of watts that one can pull from a circuit. >> A standard 117v at 15A is 1750 (1755 to be exact) >> I thought this came up while we were discussing how a (rounded off) 120v >> device can't give the HP that some units claim. So you guys figured that >> it must be momentary, to start, or burst HP, or hype in some of those >> claims. >> >> So wattage vs VA: >> In heavy duty power back up for heavy amplifiers one unit quoted >> 900w/1500VA for 7.5 mins total. >> But shouldn't the wattage and the VA be the same? >> If not, wy? >> We are going overboard, but have been known to lose up to 3 mins in the >> start up needed by the AC units. >> It's not our building, the need a new bigger service. >> So we are just getting back up o\power supply. >> What's the real math, is this right? >> >> Thanks >> >> >> >> To listen to the show archives go to link >> http://acbradio.org/handyman.html >> or >> ftp://ftp.acbradio.org/acbradio-archives/handyman/ >> >> The Pod Cast address for the Blind Handy Man Show is. >> http://www.acbradio.org/news/xml/podcast.php?pgm=saturday >> >> Visit The Blind Handy Man Files Page To Review Contributions From Various >> List Members At The Following address: >> http://www.jaws-users.com/handyman/ >> >> Visit the archives page at the following address >> http://www.mail-archive.com/[email protected]/ >> >> If you would like to join the Blind Computing list, then visit the >> following address for more information: >> http://jaws-users.com/mailman/listinfo/blind-computing_jaws-users.com >> >> For a complete list of email commands pertaining to the Blind Handy Man >> list just send a blank message to: >> [EMAIL PROTECTED] >> Yahoo! Groups Links >> >> >> >> >> >> >> -- >> No virus found in this incoming message. >> Checked by AVG Free Edition. >> Version: 7.5.476 / Virus Database: 269.11.0/929 - Release Date: 7/31/2007 >> 5:26 PM >> > >
