We are in the Chicago area and suffered a power outage, which meant our sump pump, fridge and freezer were off for several hours.

We sometimes go out of town for a week or more and therefore cannot use a conventional generator. Does anyone have any reasonably-priced sources we can use for backup power for only a fridge, sump pump and freezer for up to 48 hours? The other electrical items in our home are not much of a problem if the power goes out.