Differences in Champion Inverter model numbers

mrad wrote:
I am looking at the bundle pack that supergen.com is offering on their website.

There is quit a price difference between the 73537i ($1,049/pair) vs 73536 ($1249).

Does anyone know the differences in these two models?

Does anyone know if they refurbish (and what is done to them) the generators in their refurbished pack or if they are refurbished by champion?

$899 looks like a heck of a price