So far as powering the freezer, you can either get enough solar panels to produce enough power coupled with enough battery capacity to keep it running continuously or you could increase the battery capacity so that a smaller solar panel will keep them charged enough for short term, part time usage.

You don't need a whole house system to run only a couple of circuits.

Any pre-built or pre-assembled kit is gonna cost more than doing it yourself.

It's fairly simple to figure out the needs for a single use emergency system, it's watts, amps and ohm's law.

One quick and easy thing anyone can do for use in an emergency, pick up a pack of solar powered lawn decoration lights with LED bulbs. For $50-$100 you've got a temporary, battery powered lighting system for use when the grid goes down. Keep the batteries charged up or replace the ones that come with such a kit with some low loss Eneloop type batteries and Bob's your uncle.

The problem with a lot of comparisons of replacing grid fed power is that the infrastructure that is required for the grid fed systems are rarely taken into account. I've read of numerous examples where people thought that it would too expensive to use solar power, the only fair comparison would be to include the hidden costs of those power poles and lines outside your home, along with the guys in the bucket trucks who come along periodically and keep the system working.

There's a similar disconnect when talking about using alternatively fueled vehicles, when one adds up the real costs of the transportation system right down to the roads which are subsidized, then you realize that the alternatives don't actually cost that much more at all. I realize that the alternative fuel vehicles would be using the same roads but there's a huge amount of unseen and usually uncounted costs that have been paid for to allow us relatively cheap fuel and power.