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NK Series Solar Home Inverter

Basic System Architecture

The following illustration shows basic application for this inverter.It also includes following devices to have a complete running system:                                                                                        
This inverter can power all kinds of appliances in home or office environment,including motor-type appliances such as tube light,fan,refrigerator and air conditioner.

Basic System Architecture

The following illustration shows basic application for this inverter.It also includes following devices to have a complete running system:
This inverter can power all kinds of appliances in home or office environment,including motor-type appliances such as tube light,fan,refrigerator and air conditioner.

BKNK-img01

The Principle Diagram

1.DC first mode:
    When the solar energy is sufficient,it will charge the batteries and at the same time power the load in Pure Sinewave AC Output form(Fig 1).
When the Battery Bank has been discharged up to certain level(default 48V) and Grid is available,the system will switch to AC working mode(Bypass).If however,Grid is not available the Battery Bank will continues to discharge until the protection level(Fig 2).
When the battery voltage is recovered to the Recovery point(default 55V) , the system will switch to Inverter mode automatically .
2.AC first mode(Fig 3):
    Whenever AC input is normal,the system will run into AC working mode(Bypass) ,when AC input is abnormal,the system will work as Inverter mode.
3.SAVER mode(Fig 4):

BKNK-jpg01

6.Product Information

The front panel:
If the SAVER switch turn on,the system will work into SAVER mode,at the same time, the output will be shut,and the solar will charge the battery.

①AC indicator(GREEN=Grid Normal;OFF=Grid Abnormal)
② Solar indicator(GREEN=PV normal;OFF=PV abnormal) 
③ Wind indicator(Only available in NKW series)
④ Battery indicator(GREEN=Battery Voltage Normal;RED=Battery Voltage Low)
⑤Inverter indicator(GREEN=System Working Normally;OFF=No Output)
⑥ Fault indicator(RED=System At Fault;OFF=No Fault)
⑦ Power on/off button(Long press 2 seconds or more to turn on,and long press 2 seconds
  until the buzzer ring to shut down .If solar or Grid is normal this button will not work)
⑧ Setting button
⑨ Select button
⑩ Flip screen button
NOTE:Having solar or mains input,the system will start automatically

BKNK-jpg03

Model

BK-NK-3KW

BK-NK-5KW

 

3000W

5000W

 

DC48V

DC48V

Size (mm)

600*310*180

650*360*180

Weight(KG)

30±1

40±1

Grid (Mains) parameters

Input voltage  waveform

Pure Sine Wave(mains or generator)

Input voltage

220Vac

Working voltage range

(165--265)Vac

Frequency range

(45-65)Hz

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 input current

17A/28A

MAX charge BAT current

20A/32A

Inverter parameters

Output voltage waveform

Pure sine wave

Rated output capacity(VA)

3000

5000

Rated output power(W)

3000

5000

PF

0.9~1.0

Rated output voltage(V)

220Vac

Rated output frequency (Hz)

50Hz ± 0.1Hz

Auto track main frequency(Hz)

Yes (from the first start)

50Hz @45-55Hz

60Hz @55-65Hz

Output voltage range

±2% rms

Efficient

>80%

Overload protection

(100%

Peak capacity

6000VA

10000VA

Rated DC input voltage

48V

Min DC voltage

40V

Low DC Alarm Voltage

(44.0±1)Vdc

Low DC Cut-off Voltage

(40--44)Vdc

High DC Cut-off Voltage

(63.0±1)Vdc

High DC Recovery Voltage

(61.0±1)Vdc

No Load Power consumption

≤5%

Standby Power Consumption

≤0.5%

PV parameters

PV input OC voltage range

(75--150)Vdc

MAX input current

40A

MPPT output current(MAX)

60A

100A

 charging bat current

(20--60)A

(20--99)A

Temperature coefficient

-18mV/℃/12V

Auto temperature compensation

Setting value-(MAX -25℃)*0.018

Output voltage lines wave-peak

200mV

Wind parameters

Input voltage

xx

 rating input power

xx

MAX input current

xx

Environment

Humidity

<90%

Operating Temperature

0℃--55℃; within 35℃--55℃,the rated output power had to reduce 2% when the temperature increase 1℃(if overload,the system maybe reduce the power automatically,even shut down)

Storage Temperature

-15℃--60℃

Altitude

<3000m(more than 1000m,the rating power of each increase of 1000m decreased by 10%)

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