1,TUV,UL,CE,ISO CERTIFICATE 2,OVER 30 YEARS LIFE 3,OEM IS ALLOWED 2700 watt ... : 2700Wp Solar panel: 135w * 20pcs Solar Charge controller: 60A/48V Pure Sine wave inverter 1500w/ 48VDC Free-maintenance Sealed Lead Acid Battery: 400Ah/48VDC ... gird is inefficient -Solar panel Component lifetime of 25 years. -2 years warranty for complete system 2700 watt Solar Telecommunication system