" We have the engineering expertise to design and install your specific needs"

Some have never even heard of an EMP, much less have any protection from one. To understand a little more try reading this article from Wikipedia.

 Electromagnetic pulse - Wikipedia 

In most climates, including Tennessee, there will be periods of time when the weather produces very low solar output for a particular day and occasionally, especially in the winter, several in a row. Getting a battery bank to support numerous days in a row of "typical usage" from the sun or another source is typically not financially helpful. For true off-grid life, generators are often the initial source of backup power. A crucial aspect of the design phase is minimizing generator usage and run-time. Nobody wants to go off the grid, have to pay $600 in propane for the generator since the system was undersized, and replace their $150/month power bill. 

Now that Sol-Ark's 15 KW EMP Hardened Inverter is available, we've begun taking reservations for whole home EMP-hardened installation. If you already have a system, we can add EMP Shield production (Made in USA) and also recommend EVERYBODY (with or without a solar system) to contact your provider and consider any whole-home surge protection they offer. Some are surprisingly cheap- such as Lexington Electric's surge suppression device installed at your meter for around $75.