This is important if you want to tie to the grid. Make sure that the Solar system that you are buying are certified not only by the manufacturer but that BOSJ also recognized your inverter and also approves it. Enphase Energy Solution has all tye certifications to meet any standard and is also approved and has been inspected by Bureau of Standard Jamaica. Please also make sure that the techncians you have installing your Solar System are also certified in either Solar or Electrical.