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1. Introduction   

1.1 Introduction     

This manual describes solar inverters: 

NAC20K-DT/NAC25K-DT/NAC30K-DT/NAC33K-DT.   

These inverters are transformerless based inverter. 

Please read the safety instructions in this manual first. Throughout the manual it is assumed that the reader is 

familiar  with  AC  and  DC  installations  and  knows  the  rules  and  regulations  for  electrical  equipment  and  for 

connecting  it  to  the  utility  AC  grid.  It  is  especially  important  to  be  familiar  with  the  general  safety  rules  for 

working with electrical equipment. 

 

1.2 Applied designations     

Throughout the manual important information is shown at different levels depending on the character of the 

information, as shown here: 

 

Safety information important for human safety. Violation of warnings may result in injury 

to persons or death. 

 

Information important for the protection of property. Violation of this type of information 

may cause damage and loss of property. 

 

Useful additional information or “Tips and Tricks" on specific subjects. 

 

1.3 Important safety information 

Read this before installing, operating or maintaining the inverter. 

 

 

 

 

 

 

 

 

 

 

 

 

Before installation: 

Check  for  damage  to  inverter  and  packaging.  If  you  are  in  doubt,  please  contact  your 

supplier before installing the inverter. Check the voltages of the solar modules and make 

sure they are within the limits of the inverter specifications before connecting them to the 

inverter. 

Installation: 

Only trained and authorized personnel familiar with local electrical codes may install the 

inverter. For optimum safety, please follow the steps described in this manual. Keep in 

mind that the inverter has two voltage carrying sides, the PV input and the AC grid. 

Disconnecting the inverter: 

Always  disconnect  the  AC  line  first! Afterwards  disconnect  the  PV  lines.  Note  that  the 

inverter can still be charged with very high voltages at hazardous levels even when it is 

disconnected from grid and solar modules. Wait at least 5 min. before proceeding, after 

having disconnected from grid and PV panels. 

Operating the inverter: 

Before  connecting  the  AC  grid  to  the  inverter,  make  sure  that  the  installation  cover  is 

Summary of Contents for R3 Pro NAC20K-DT

Page 1: ...0...

Page 2: ...3 Technical data 5 2 4 Grid codes 6 3 Installation and startup 7 3 1 Package information 8 3 2 Installation environment 8 3 3 Installation position 8 3 4 Mounting procedure 9 3 5 Electrical connectio...

Page 3: ...tion or Tips and Tricks on specific subjects 1 3 Important safety information Read this before installing operating or maintaining the inverter Before installation Check for damage to inverter and pac...

Page 4: ...uring parallel string operation is 950V Higher voltages may result in permanent damage to the inverter The selection of PV string output should be based on the optimum utilization of the invested capi...

Page 5: ...T NAC33K DT Figure 2 2 Electrical Terminals 1 DC Switch 2 DC PV terminal 3 Communication port 4 AC terminal 5 LEDs 6 Display screen 7 Keys For safety reasons the use of a DC switch is recommended Betw...

Page 6: ...ax DC Input Current 20A 20A 20A 30A 30A 30A 30A 30A DC Switch Integrated AC Output Data Rated AC Power 20000W 25000W 30000W 33000W Max output power 22000VA 27600VA 30000VA 33000VA Max AC Current 32A 4...

Page 7: ...0 years Certifications Standards Grid Regulation VDE AR N 4105 VDE 0126 1 1 PEA AS4777 EN50549 NB T 32004 2013 CEI0 21 IEC61727 IEC62116 IEC60068 IEC61683 Safety Regulation IEC 62109 1 IEC 62109 2 EMC...

Page 8: ...s IEC61727 28 Mexico Mexico power Grid meet Grid standards IEC61727 60HZ 29 NZ4777 New Zealand power Grid meet Grid standards NZ4777 30 Philippines Philippines power Grid meet Grid standards IEC61727...

Page 9: ...play and possible maintenance activities please install the inverter at eye level 3 Inverters should NOT be installed near inflammable or explosive items Any strong electro magnetic equipment should b...

Page 10: ...should be no less than the following value Figure 3 4 Distance required of Invertors 3 4 Mounting procedure Setp1 Drill 4 Fix 10 holes in the wall according to the dimensions Step2 Fix the wall mount...

Page 11: ...10 Figure 3 5 mounting the inverter...

Page 12: ...it value inverter will quickly disconnect with the grid If the leakage current protection device is installed externally the action current should be 300mA or higher Connect the inverter to the Grid a...

Page 13: ...itch is turned off 2 Make sure PV string polarity confirms with DC connector otherwise it will cause damage to inverter 3 Make sure the maximum open circuit voltage Voc of each PV string does not exce...

Page 14: ...re 3 9 communication interfaces Figure 3 10 RS485 in multiple series Please make sure the RS485 connecting cables not exceed 1000m Communication lines must be separated from other power lines to avoid...

Page 15: ...ter AC side through AC circuit breaker 2 The DC cable connected correctly to the inverter DC side through DC circuit breaker please be attention to the cable connected to the two string correctly and...

Page 16: ...cally When the next day comes the input voltage reaches the start value it will start again automatically 4 User Interface 4 1 Led and key Figure 4 1 LED display No Name Description 1 ESC Button ESC O...

Page 17: ...ate time setting Language setting Grid info Input Password Serial number Firmware update Recovery setting String info Day Yield PV info Inverter type DSP M SW MCU H SW DSP S SW SFLASH_FS Init Clear en...

Page 18: ...r Detailed information about the entire system modules circuits etc Documentation of previous claim exchanges if applicable In the case of an exchange the remainder of the warranty entitlement will be...

Page 19: ...If grid is ok and the problem exists still maybe the fuse in the inverter is open please call service Over Temperature INV OV Temp BST OV Temp AMB OV Temp 1 The internal temperature of inverter is hig...

Page 20: ...uSwAcOCP SwOCP_PV1 4 HwOCP_BST1 4 UHwOCP_BST HwBusOVP uHwBusOVP BusUVP BusOVP PLL fault BusVolt_Ublc IacRms_Ublc VacRms_Ublc DciOCP GFCI 30mA GFCI 60mA GFCI 150mA GFCI 300mA GFCI 5 times uHw_GFCI Fan...

Page 21: ...20 P N 422 00028 01...

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