Be prepared and safe with an Interlock kit for your existing panel
SQUARE D Interlocks
Square D

SD-H200A Square D Generator Interlock Kit Homeline Indoor or outdoor 150 or 200 amp panel
Square D

QOM1 or QOM2 main breaker with a 2-pole breaker back fed from a generator For use on indoor QO 150A - 225A Main Breaker Load Centers