N.J. Stat. Ann. § 54:4-3.116

The enforcing agency, when requested for any such certification, shall certify a system as being a solar energy system whenever he finds the equipment, facility, device, or system installed was designed primarily as a solar energy system, in accordance with regulations prescribed by the commissioner. Said certificate shall contain information identifying the system and the cost thereof and shall be in such form and detail as the Director of the Division of Taxation shall prescribe and, further, said certificate shall be submitted to the applicant therefor, with a copy retained on file by the enforcing agency, and a copy thereof shall be sent to the assessor of the taxing district in which such facilities are located and have been installed; and the exemption from taxation for such equipment, facility or device shall become effective for the tax year following the year in which certification has been granted and thereafter during its use primarily for such purposes.