Comment by nunobrito
Maybe for professional communications. For cases where the grid is gone, you will quickly see how quickly you stop using electricity for luxuries such as that one.
At most you will be able to charge smartphones and small devices with solar panels. Keeping a larger Wi-Fi router running only on solar? Very seldom.
The price of solar panels and batteries keeps falling. You can go an Amazon today and get a setup that can power a switch/router/AP 24/7 in winter for a few hundred dollars.