Solar Products

NK Serise

Number BK-NK-(3KVA-5KVA)

  • Features
  • Parameters

NK Series Working Principle

Solar home inverter working principle: when the normal work of the solar photovoltaic controller by inverter power supply, then the input dc inverter is transformed into the pure sinusoidal alternating current output. When abnormal PV input, battery to the inverter power supply. When the battery discharge into the low voltage point, system a battery low voltage signals, and then into the grid operation mode; When solar or battery voltage, dc voltage return to set up the system signal dc output is normal, and then into the inverter running mode.( Inside the machine has two 50A built-in solar controller)
Main Features:

● Using industrial-grade intelligent design .
Pure sine wave output, suitable for TV sets, refrigerators, induction cooker, electric fans, microwave ovens, air conditioning and other household equipment .
Technical parameters are conveniently displayed on the LCD.
● Can choose LCD touch screen interface system (Optional).
● Have Intelligent agenda management function.
● Have capacity cumulative function, can view real-time accumulated generating capacity .
● Have overcharge, over-discharge, overload, short-circuit, low voltage, over heat protection function.
● Can choose mobile SMS alarming system (Optional).
● Can choose cloud data system(Optional)
● Can choose Wind & Solar Energy Hybrid power supply system (Optional).
● USB interface setting adjustment via software.
● Can setting charge voltage,current,switch-point etc through LCD.
● Have perfect protection mechanism and self starting function.
Model (NK) Solar Home Inverter
2.5K48 5K48
2500W 5000W
Grid (Mains) Mode Specifications
Input voltage waveform Pure Sine Wave(mains or generator)
Rated output voltage 220Vac
Low voltage protection 180Vac±4%
low voltage recovery point 190Vac ±4%
High voltage protection 260Vac±4%
High voltage recovery point 250Vac±4%
Max AC input voltage 270Vrms
Rated input frequency 50Hz/ 60Hz  (auto)
Low voltage recovery point
by frequency
58+0.3Hz ( 60Hz );
48+0.3Hz ( 50Hz )
Low voltage shut-off point
by frequency 
57+0.3Hz ( 60Hz );
47+0.3Hz ( 50Hz );
High voltage recovery point
by frequency
64+0.3Hz ( 60Hz );
54+0.3Hz ( 50Hz )
High voltage shut off point
by frequency
65+0.3Hz ( 60Hz );
55+0.3Hz ( 50Hz )
Bypass output voltage waveform Same as Input Waveform
Overload protection Breaker On
Short circuit protection Breaker On
Power efficiency >95%
Switching  time (AC to DC) 5ms
Switching time(DC to AC)   5ms
Bypass Max load current 30A
Inverter Mode Specification
Model (NK) NK Model
2.5K48 5K48
Output voltage waveform Pure sine wave
Rated output capacity(VA) 2500 5000
Rated output power(W) 2500 5000
PF 0.9~1.0
Rated output voltage(V) 220Vac
Rated output frequency (Hz) 50Hz ± 0.3Hz
Auto track main frequency(Hz) Yes (from the first start)
50Hz @48-54Hz
60Hz @58-64Hz
Output voltage range ±10% rms
Efficient >85%
Overload protection (SMPS load) (110%150% ±10%: after 1S cut off output voltage
Peak capacity (1s) 7500VA 15000VA
Short Circuit protection Current limit(1s after power off)
Rated DC input voltage 48V
Min DC voltage 40V
Low-voltage alarm 10.5Vdc±0.3Vdc(12V)/21.0Vdc±0.6Vdc(24V)/42.0Vdc±1.2Vdc(48V)
Auto cut off level when DC input voltage low 10.0Vdc±0.3Vdc(12V)/20.0vdc±0.6Vdc(24V)/40.0Vdc±1.2Vdc(48V)
Cut off level when Input over voltage alarm 16.0Vdc±0.3Vdc(12V)/32.0Vdc±0.6Vdc(24V)/64.0Vdc±1.2Vdc(48V)
Input over-voltage recovery 15.5Vdc±0.3Vdc(12V)/31.0Vdc±0.6Vdc(12V)/62.0Vdc±1.2Vdc(48V)
PV Input Specification
PV input working voltage range 24V system DC30~DC100V
48V system DC60~DC150V
Input low-voltage protection point 24V system DC30V
48V system DC60V
Input low-voltage recovery point (start charging voltage point) 24V system DC34V
48V system DC65V
Input over-voltage protection point 48V system DC145V
Charging rated current 48V system 50A
Temperature coefficient 12V/24V/48V system ±0.02%/
Auto temperature compensation 12V/24V/48V system 14.2V-max -25℃)*0.3
Output voltage lines wave-peak 12V/24V/48V system 200mV
Output stab-volt  precision 12V/24V/48V system ±1.5%
Output discharge specification
Output voltage According to battery voltage
Output low-voltage protection Default 10.5V, 11V back to recovery, can be set;
Output rated current 50A
Optional Wind characteristics
Input voltage 48VAC
Wind rating power input 1600W
Wind max power input 35A