1.ÿ Structure of Photovoltaic Grid-Connected Inverters SG250K3 DescriptionSG630KTL is using low-frequency isolation transformer for protective purpose. Its wider input voltage range ensures more combinations ofthe PV arrays. Moreover, optical fiber isolation technology has been adopted to increase its anti-interference ability under the circumstancesof multiple inverters installation. In addition, optimized circuit and structural design has improved system thermal efficiency which enhancingsystem reliability and stability. Reinforced protection functions, including the DC ground fault protection, make it the best product for largescale PV power plant.ÿÿ2.ÿ Main Features of the Photovoltaic Grid-Connected Inverters SG250K3ÿ* Advanced Technology, Grid-friendly? LVRT, HVRT and zero-voltage ride through to cope with various grid conditions? SVG function at night, response to grid directives around the clock? Reactive power control with power factor from 0.9 lagging to 0.9 leading* More Compact, Saving Space for PV Plant? Power density enhanced 50%, one of the central inverters with highest power density in the PV industry? Save installation spaces and lower the plant initial cost? Front maintenance, able to install against the wall, convenient installation and maintenance, saving operation cost of the PV plant.* Efficient, More Yields? Max. efficiency at 97.3% with transformer ? Efficient MPPT control strategy, improve power yields? 28335 chips adopted, more accurate calculation, more power yields;?ÿ Intelligent speed regulation cooling concept, low consumption, high efficiency* More Advantages ? Perfect protection and fault alarm system, safe and reliable? User-friendly dynamic graphics LCD? Redundant dual power supply solution improving the system reliability ? Efficient PWM algorithm, low consumption of switch? Operate without power derating at -25? – +55?? Reliable and continues operation in high altitude environment ? Auxiliary heater (opt.)? CGC certification, compliance with BDEWÿÿ3.ÿ Photovoltaic Grid-Connected Inverters SG250K3 Imagesÿÿÿÿ4.ÿ Photovoltaic Grid-Connected Inverters SG250K3 SpecificationMODELÿSG250K3ÿDC SIDE DATAMax. DC Voltageÿ1000VdcÿStart Voltage500VMPP Voltage Range480~850VdcÿMin. DC Voltage480VMax. DC Powerÿ284kWpÿMax. Input Currentÿ592AÿAC SIDE DATARated Output Power250kWÿMax. AC Output Current397ARated Grid Voltage400VacGrid Voltage Rangeÿ310~450VacRated Grid Frequency50Hz/60HzGrid Frequency Range47~52Hz/57~62HzOutput Current THD<3% (at nominal power)DC Current Injection<0.5% of rated inverter output currentPower Factor0.9(lagging)~0.9(leading)SYSTEMÿMax. Efficiencyÿ97.3%(with transformer)Euro Efficiencyÿ96.7%(with transformer)Protection DegreeIP21Power Consumption at Night<80WOperating Temperature-25~+55øCCooling MethodTemperature controlled forced-air coolingRelative Humidity0~95%, non-condensingMax. Working Altitude6000m (operation with derating above 3000m)DISPLAY AND COMMUNICATIONSDisplayÿtouch screen LCDStandard Comm. InterfacesRS485Optional Comm. InterfacesEthernetMECHANICAL DATAÿDimensions(WxHxD)1006x2034x850mmNet Weight1600kgÿÿÿÿ5.ÿ FAQ of Photovoltaic Grid-Connected Inverters SG250K3Q1. What is the difference betweenÿinverterÿandÿsolar inverter?A1. Inverter only has AC inpput, but solar inverter both connect to AC input and solar panel, it saves more power.ÿÿQ2. What is the difference betweenÿMPPT&PWM?A2. MPPT has higher efficiency, it can track the max power point and won't waste energy.