Thanks, jrnymn7 and BFL13, for the explanations :).
So, for the future, could I realistically run the freezer in the OP on 150watts solar? I'd thought that was unrealistic, wuth limited space (and $$) for batteries. But y'all seem to imply otherwise :).
It stays cold for 48 hours without elec, on cool days, so should be able to wait out storms. I mostly camp in deserts and beaches, so lots of sun.
In the past, I just don't bring frozen stuff if I won't have elec! But this trip I thought I would have power. For health readons a freezer is useful to me.
How big a battery would I need?