You may be able to run the pump with a 5KW machine but I would opt for a 7.5 KW. It is usually the starting amps that causes the problem with home generators. At 280 feet you are working against a 120lb head, now add to this the working pressure of the system, typically 40 psi and you can see that the pump must draw enough current to buck at least 160 to 180 psi working pressure. Since the water column is always setting on the pump, "if you have a foot or check valve which prevents the pipe bleed back" then the pump is working against that pressure at start-up. Before investing in a generator you might want to run a few test with an amprobe to get a feel for the loads you will be addressing. I found an inexpensive amprobe on Amazon for $20.00 which would be adequate to give you a working ball park figure. Starting amps are many times greater than the running amps and can easily load down a portable generator.
Dale in the Flatlands.Ed wrote:
My well has a submersible 240V 1 1/2 HP pump about 280 feet down in the hole. Can anyone tell me how big a generator I'd need to run it? Thanks, Ed
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