Figuring power usage ??

Our trailer is factory made and has 2 circuits in it, each with a 30amp breaker. How can I know how much juice I will be using when some of the items don't list amps used. Some of the plates will list the amps but some won't. For instance one of the warmers I'm lookimng to buy simply says 120v/1000 watts and doesn't mention amps

We want to run a 2 head frozen drink machine, a hot dog steamer, a refrigerator, a nacho warmer, a microwave, a couple of crock pots for chili and a heat lamp/warming tray. Does this sould like too much for our system? Probably installing an AC would be out of the question, right?

Also I've had some of the fairs/shows we have applied to ask how much electrical usage we will need. What do I tell them? How long and how heavy of an extension cord should I get to carry with us. I already own a portable generator I use on the farm but it says 5,000 watts and doesn't say anything about amps. I wonder if it would run an AC. Thanks.

Mike S.

120v/1000 watts = approx 8.3 amps. The Bunn Ultra 2 which have 2 dispensers uses 12-15amps so my guess is they would all use around the same. For the air conditioner you take BTU/EEU rating and that will give you the watts example - 5200 BTU, 9.7 EER = 536 watts Hope this helps

I forgot to add, to be safe I would round up the watts to 550. I believe the EEU ratings are a little like the MPG ratings on cars. Maybe not that bad but better safe than sorry

Why not hire an expert on the subject and get his or her advice?

scali71 got the formula reversed. Watts = Volts * Amps Putting the old algebra to use it is Watts/Volts = Amps. Voltage can be 120 unless you are using 220 equipment which is usually heavy duty equipment (Electric home dryers are 220 which is why they have the odd receptacle.) If you see something rated in watts take the watts and divide by 120 volts. So Scali71 example is 1000 watts/120 volts which is 8.33 amps. Scali71 answer is correct so he figured right then transposed the formula when they typed it in. Although the formula needs to be right to figure what you want.

Watts = Volts * Amps or Watts/Amps= volts or Watts/volts = amps Volts for most house voltage can be 120. Plug in the numbers an go to town! RJF

By the way your generator is 5000 watts 120 volts. 5000/120= 41.66 amps. Here is a site that has a chart for wire size.
http://www.rowand.net/Shop/Tech/WireCapacityChart.htm
RJF

RJF, Thanks for the correction. I did not catch that and I double checked it before I posted it

quote:

Originally posted by scali71

RJF, Thanks for the correction. I did not catch that and I double checked it before I posted it

Your welcome, I'm sure I could use your eyes for double check on my posts, (I'm dyslexic!) RJF

Adding a extra bow with more breakers is not hard and a local contractor should be able to do it for you If you do not know how. 5000 seems like it may be cutting kinda close. Some of you items may have surge rates on start up and such.