- 1. computing electrical loads (score: 1)
- Author: Mark Andy <mark@sccaprepared.com>
- Date: Mon, 15 Nov 2004 16:50:23 -0500 (EST)
- Anyone know of a chart or whatnot that lists common amperage loads for things like: 100W lightbulb 3/4 hp garage door opener small 110V hot tub heater/pump Etc. etc. etc.? Just trying to see if I'm
- /html/shop-talk/2004-11/msg00026.html (7,491 bytes)
- 2. RE: computing electrical loads (score: 1)
- Author: "Randall" <tr3driver@comcast.net>
- Date: Mon, 15 Nov 2004 14:31:17 -0800
- I don't know of a chart anywhere, but these are easy. Allow an amp. 7-8 amps if it's really putting out 3/4 hp. Electric motors draw a big start-up surge though, so I'd allow more like 10 amps to be
- /html/shop-talk/2004-11/msg00027.html (8,192 bytes)
- 3. Re: computing electrical loads (score: 1)
- Author: "John T. Blair" <jblair1948@cox.net>
- Date: Mon, 15 Nov 2004 17:42:30 -0500
- Mark, Just the easy way, read the lables. Then do a little math: Power = Voltage * Current Watts = volts * amps So for your 100W light bulb assuming it's on a 110 circuit P = E * I --> using some alg
- /html/shop-talk/2004-11/msg00028.html (9,026 bytes)
- 4. Re: computing electrical loads (score: 1)
- Author: John Miller <jem@milleredp.com>
- Date: Mon, 15 Nov 2004 14:49:40 -0800
- Ohm's law and friends? http://www.angelfire.com/pa/baconbacon/page2.html Best to use mfr nameplate ratings where possible, allow for motor startup current where appropriate, and bear in mind the Nat
- /html/shop-talk/2004-11/msg00030.html (7,829 bytes)
- 5. Re: computing electrical loads (score: 1)
- Author: Larry Spector <lspector@gmail.com>
- Date: Mon, 15 Nov 2004 18:26:33 -0500
- I saw plenty of charts listing various loads when I was shopping for a generator. Here's the first one google turned up: http://www.vmisales.com/voltmaster/appchart.html Hope this helps. -Larry
- /html/shop-talk/2004-11/msg00032.html (7,464 bytes)
- 6. RE: computing electrical loads (score: 1)
- Author: "Randall" <tr3driver@comcast.net>
- Date: Mon, 15 Nov 2004 15:29:25 -0800
- We've had this discussion before ... it takes a lot more than 750 watts to make one horsepower. 1000 volt-amps is a much better approximation (and volt-amps is what we want anyway, since motors are
- /html/shop-talk/2004-11/msg00033.html (7,555 bytes)
- 7. RE: computing electrical loads (score: 1)
- Author: "Larry list account" <list@marketvalue.net>
- Date: Mon, 15 Nov 2004 16:06:37 -0700
- Watts = Amps x Volts Light bulb: 100 watts = Amps x 110 volts Amps = .9 Obviously you'll need to know to of the variables. Many items list amps on the appliance. Your garage door is an example of tha
- /html/shop-talk/2004-11/msg00036.html (8,372 bytes)
- 8. Re: computing electrical loads (score: 1)
- Author: John Miller <jem@milleredp.com>
- Date: Mon, 15 Nov 2004 16:37:45 -0800
- Well, technically, one horsepower IS 746 watts. The problem is that if you're converting electrical current into, the device (motor) and all the other stuff in the way is nowhere near 100% efficient
- /html/shop-talk/2004-11/msg00037.html (7,500 bytes)
- 9. RE: computing electrical loads (score: 1)
- Author: "Randall" <tr3driver@comcast.net>
- Date: Mon, 15 Nov 2004 16:53:57 -0800
- Exactly. Motors are notoriously inefficient (the excess power gets converted into heat, which is why they always get hot); and small motors are almost always heavily inductive (which means the true
- /html/shop-talk/2004-11/msg00038.html (7,776 bytes)
- 10. RE: computing electrical loads (score: 1)
- Author: "Jim Bauder" <jimbpps@cox.net>
- Date: Mon, 15 Nov 2004 19:50:54 -0700
- Not sure about the size of your garage of course, but when I wired up my garage at my old house, I pulled 75 amps into the garage from the main panel to a 24 breaker sub-panel with a back-fed main b
- /html/shop-talk/2004-11/msg00039.html (8,861 bytes)
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