relink - micro inverter - fire hazard declaration
TRANSCRIPT
www.relink.com.mt Birkirkara, 2015 May 30th
The RELINK microinverters significantly contribute the reduction of the fire hazard in PV installations, the microinverters strongly contribute to the achievement of the safety objectives required by the European Community regulations, when it comes to the fire hazard risk valuation.
STRING & CENTRAL INVERTERS RELINK MICRO INVERTERS
PROBLEM DESCRIPTION RISK DESCRIPTION RISK
DC cables routing The DC cables (avarage lenght between 15 to 60 meters) probably run inside the building.
HIGH The DC cables lenght is less than 1 meter. Never run inside the building.
NONE
DC circuit unprotected Up the DC String box. The unprotected energized circuit lenght varyes between 15 and 60 meters depending on the strings lenght.
HIGH Up to microinverter. The unprotected energized circuti lenght is in any circumstance less than 1 meter.
LOW
Energized circuit During daylight, in case of fire or problems when the AC main opens, the DC strings will be in any circumstance energized (300 ÷ 900V)
MEDIUMHIGH During daylight, in case of fire or problems when the AC main opens. The DC circuit energized (<60V) the PV mosule cable (only 1 meter).
LOW
Atmosferic induced overvoltage
Strings with long lenght (from 15 to 60 mt) increase the area of the electrical “coil”, increasing the risk of atmosferic induced overvoltages that could result in an electrical arc..
MEDIUMHIGH String with reduced lenght (1 mt) drastically reduces the area of the electrical “coil”, statistically reducing risk of atmosferic induced overvoltages.
LOW
Cause of fire Is demonstrated that use of DC surge arresters, fuses and diodes in DC string box and lack of maintenaince increse causes of fire.
MEDIUMHIGH Not Present NONE
Electrical injuries risk DC Operation Voltages VDC = 300 ÷ 900V HIGH DC operation Voltages VDC < 60 V NONE
RELINK Limited
Vincenzo di Gennaro CTO