I would be happy with a small solar battery installation.
Something that would put out 500-1000 watts@12v an inverter
that would handle any 120v load I can connect to it ( 2 sockets )
and a battery that will support my home for 4-6hours for brown outs. I figure I would only need to run my freezer for 1-1.5hr/day
to keep my food. The fridge would likely take twice that because it will be used more often. other than those items I can shut down our home as needed to cut consumption. Lights are CF, comp.
runs thru a battery, cell phone charger, no heat needed we have a fireplace.
I checked out mysolarbackup and the power it provided for the cost
was prohibitive, IIRC the internal battery only has the capacity to run my freezer for 15-20 min until it is totally dead.