Marine batteries with solar charger takes it notch higher in terms of energy self-sufficiency. However it may or may not be the optimum choice for emergency use. You still have to deal with sunshine to keep the batteries charged. Batteries & solar panels , to lesser extent, have specific shelf life. As they age they drain quicker & hold less charge. My preferred solution was to get a 2500 watt portable gas generator with built in inverter & energy conserving governor. It runs close to 12 hours on 3 gallons of gas at half load, rain or shine. Best of all at only 65lbs I can haul this generator from my main residence to my camping site or any other offsite for instant, cheap electrical access.
Either way any preparation for emergency power outtage is better than none. I think everyone should be prepared. Otherwise you're just a sitting duck waiting for the big bang.