hp -> Watts?

[Mark Andy <mark@sccaprepared.com>]

Howdy,

Our power went out last night, so I ran an extension cord from the little 
1000W Honda (EX, not an EU) generator off down to the sump pump, plugged 
it in, and was dismayed to see the pump not work.  Later on, power came 
back on and the pump worked fine.

I can't imagine that pump is anything more than a 1 hp unit, probably more 
like 1/3 or 1/2 hp...  What size generator do I need to make that puppy 
work?

Thanks!

Mark