Hi Matt. You can find lots of generator work sheets online, but a basic one I used was from Sears at http://www.sears.com/ue/lawn/Sears+Generator-WattageWorksheet.pdfIf I post a list of equipment I need to power in case of an emergencey power outtage, could someone help point me in the right direction of how big a generator I need? Bare with me, I am new to this....
Single phase motors have a very low power factor an high % of slip. All Small single phase generators (except Military) are rated at a power factor of unity (1.0) only. To use the std wattage equations w/o also using the effect of power factor change is a fried gen-set in the making. It's hard to answer the question above, w/o knowing the exact unit (Brand) your looking at. I'm assuming (based on the -80 unit) you need a quality machine for either life safety or a monitory issue. Therefore, I'd suggest a 10KW unit an make sure you balance the load equally also. The load will have to be stepped on even with a 10 KW, if you went with a 15, you could dump it all on at once. Starting motors is much different than running them, an single phase motors are the worst of the bunch. If you want to run the numbers yourself, I'd guess your running PF at .86 lagging, with a starting PF of 0.3-4 Hope this helps. KennethThanks for posting. I was thrown into a facilities roll at my job and I have been tasked to find a generator that will support 3 refrigerators, 3 freezers and an incubator. I have all the voltage and amp readings:
Fridge 1 - 115V, 60Hz, 5A
Fridge 2 & 3 are identical - 115V, 60Hz, 9.1A
Freezer 1 - 115V, 60Hz, 5A
Freezer 2 - 120V, 60Hz, 16A (this is a -80 freezer)
Freezer 3 - 115V, 60Hz, 12A (this is a -20 freezer)
Incubator - 115V, 60Hz, 5A