“We are getting an off grid system. Grid ties will get fried along with everything else.”
There might still be trouble even on an isolated system. The wires leading from the panels (and perhaps the panels themselves) may act as antennas to harvest the EMP pulse, frying the charge controllers and inverters.
Most of this EMP talk is hype.
All signals weaken exponentially with distance.
If you try to calculate how many EMP weapons would be required to cover the country, you get close to looking at infinity.
Be afraid, be very afraid.