Principle 1

Less than 30CM, maintenance channel width

Principle 2

Less than 1CM, the distance from sealing strip to the pv panel

Principle 3

Less than 4CM, the maximum dislocation of the upper、lower、left and right of the adjacent pv panel

Principle 4

50CM barrierfree, PV array at four sides

Principle 5

5*8CM barrierfree, the identification area at the bottom of pv array