Saturday, July 4, 2020

Epever , Epsolar technology

New Pure Sine Wave inverter NPower series has been launched!

Posted On : Tuesday, October 22, 2019

Inverters are employed to convert the DC to AC power, while they also change the output voltage, so inverters can be considered as power adapters. They have two input terminals where positive/negative terminals of the battery are connected to positive/negative input terminals of the inverter and the AC output terminal of the inverter is connected to the AC switch and then is connected to the outlet to supply AC power. The inverter can be applied in many fields, such as household emergency lighting system, vehicle-mounted system, and small field power supply, etc. Several output waveforms are produced by inverters including square wave, sine wave, and modified sine wave.

 

Figure 1- several output waveforms of electrical inverters

 

The output waveform of the power distribution network is a 50Hz Sine wave, so the inverters with sine wave outputs are more expensive since they can connect to the network with minimum power loss. Here, we will introduce a new product of EPEVER named NPower Pure Sine Wave Inverter which is provided in several models which will be discussed by later sections.

NPower is a kind of pure sine wave inverter which can convert 12/24VDC to 220/230VAC. This inverter can benefit its intelligent and full digital design which adopts with the advanced SPWM technology, voltage, and current double closed-loop control and completely isolated inverter technology. These technologies are employed to ensure the product with high-quality electrical parameters, the stronger ability to resist impact load and the input surge prevention design at the same time. Also, the special requirements of lithium battery’s surge limit are considered to achieve the safe and reliable performance by the inverter.

The inverter’s case is designed with the galvanized board, which has the advantages of high strength and corrosion resistance.

The prominent features making this inverter prior to conventional ones are high reliability, high efficiency, simple appearance, complete protection function, easy installation, and easy operation. These features and characteristics of NPower pure sine wave inverters make them suitable for AC load of household appliances, power tools, industrial equipment, electronic audio and video and solar photovoltaic power generation system, such as vehicle inverter application system, solar RV, solar household, solar yacht, and solar power station. In this section, we will introduce the features of Npower series inverters to help the customer to choose the proper inverter for specific applications.

 

Figure 2- EPEVER NPower Series Pure Sine Wave Inverter

 

Features of EPEVER Npower Series Pure Sine Wave Inverter

Some of the important features of EPEVER NPower series pure sine wave inverters are highlighted here which implies the priorities of these inverters over conventional ones.

  • Pure sine wave output and adaptability with advanced SPWM technology.
  • Adopt voltage and current double closed-loop control to enhance the load capacity.
  • The input and output of the Npower series Inverter adopt the completely isolated inverter technology with high reliability.
  • The input adopts the anti-surge design to meet the special requirements of surge limitation for the lithium battery and avoids the dangerous surge current generated by the connection of the startup.
  • Low output harmonic distortion (THD≤3%). 
  • Electromagnetic Compatibility (EMC) tests are considered in the inverter’s design to prevent interference of connected equipment.
  • Optional output voltage (220/230 VAC) and frequency (50/60 Hz).
  • Extensive protections including input reverse polarity, overheating, input overvoltage, input low voltage, output overload, and short circuit.
  • RS485 port can connect the communication module, realize remote start/stop of the inverter and monitor the running status via the APP or PC software.
  • Set the input low voltage and reconnect voltage via the APP or PC software.
  • Set the inverter’s ID via the APP or PC software to monitor several inverters.
  • The case is designed with the galvanized board, with high strength and strong corrosion resistance.
  • Various models are produced to adopt with Chinese dual-socket, Australia/New Zealand and European Terminal.
  • Easy maintenance and repairmen.

 

Structure of the EPEVER DuoRacer MPPT charge controller

In this section, the structure of NPower series inverters and their various ports and terminals will be discussed to help the proper operation and wiring of solar systems.

 

1) DC Input Panel

 

2) AC Output Panel

 

The table below is employed to introduce the terminals of the inverter in both categories of DC input panel and AC output panel.

 

1

 DC input voltage range(1)

7

 Working indicator(green)(3)

2

 Grounding terminal

8

 RS485 communication port(4)

3

 Ventilation fan(2)

9

 External switch connection point

4

 DC input terminal positive

10

 AC output switch

5

 DC input terminal negative

11

 Mode switch(5)

6

 Fault indicator(red)(3)

12

 AC outlet(3)

 

The superscripts demonstrated in the table should be explained in detail to introduce the ports correctly.

(1) Input rated voltage

  • The voltage range is 10.8~16V for 12V system input.
  • The voltage range is21.6~32V for 24V system input.

(2) Ventilation fan

The cooling fan will be automatically turned on if the inverter could reach any conditions which are mentioned below.

  1. Heat sink temperature is higher than 45℃.
  2. Internal temperature is higher than 45℃.
  3. Internal temperature is higher than 10℃, and the output power is larger than half of the continuous power for 25℃.

 

The cooling fan will be automatically turned off if the inverter reaches all the conditions mentioned below.

  1. Heat sink temperature is lower than 40℃.
  2. Internal temperature is higher than 40℃.
  3. The output power is lower than the constant power (details are illustrated in table below).

 

 NP260-12/22

 <80W

 NP400-12/22

 <150W

 NP600-12/22

 <200W

 NP800-12

 <300W

 NP1000-22

 <400W

 NP1200-12/22

 <500W

 

(3) LED Indicator and Buzzer

 

Working indicator

Fault indicator

Buzzer

Status

Green super flashing

Red off

No sounding

Standby

Green on solid

Red off

No sounding

Output is normal

Green slowly flashing

Red off

Sounding

Input under-voltage

Green fast flashing

Red off

Sounding

Input overvoltage

Green on solid

Red on solid

Sounding

Over-temperature

Green off

Red fast flashing

Sounding

load short circuit

Green on solid

Red slowly flashing

Sounding

Overload

Green off

Red off

Sounding

Output voltage abnormal

 

(4) RS485 Communication Port

The picture of the RS485 communication port and the port definition are illustrated here, these communication ports are employed to connect the inverter to optional accessories such as Bluetooth or Wi-Fi modules.

 

 

1

5VDC

5

RS-485-A

2

5VDC

6

RS-485-A

3

RS-485-B

7

GND

4

RS-485-B

8

GND

 

(5) Mode Switch

This feature illustrates the output voltage level and frequency of the EPEVER NPower pure sine wave inverter which includes both 220VAC and 230VAC.

When the switch of number 1 is on the 230V side, the output voltage is 230VAC, otherwise, it is 220VAC.

When the switch of number 2 is on the 60Hz side, the output frequency is 60Hz, otherwise, it is 50Hz.

(6) AC Outlet

In the previous section, we have introduced the ability of EPEVER NPower series to adopt with different countries distribution networks, since different AC outlets are designed to connect the inverter to the domestic appliances. Here, some of these outlets are demonstrated.

Chinese Dual Socket:

 

 

Australia/New Zealand:

 

 

European:

 

 

Terminal:

 

 

After introducing of EPEVER NPower series structure, in this section, we will discuss the naming rule of this product which can define the difference between several models of inverters. An additional table will be provided to emphasize the characteristics of each model including input/output voltage level and output power.

 

 

Models

Input rated voltage

Output rated voltage

Output power

NP260-12

12VDC

220/230VAC

260W

NP260-22

24VDC

220/230VAC

260W

NP400-12

12VDC

220/230VAC

400W

NP400-22

24VDC

220/230VAC

400W

NP600-12

12VDC

220/230VAC

600W

NP600-22

24VDC

220/230VAC

600W

NP800-12

12VDC

220/230VAC

800W

NP1000-22

24VDC

220/230VAC

1000W

NP1200-12

12VDC

220/230VAC

1200W

NP1200-22

24VDC

220/230VAC

1200W

 

From the topology of a solar system, we know that PV solar panels are connected to the charge controller to charge the battery, properly. Several types of batteries such as lithium or lead-acid ones can be employed in a solar system. While the battery is charged, it can launch the inverter to provide AC power for domestic appliances. The schematic diagram of this process is illustrated below.

 

 

It is recommended to connect the DC input of the inverter to the terminals of the battery directly instead of connecting to the charge controller’s battery terminals. Otherwise, the charging frequency spikes of the controller may lead to over-voltage protection of the inverter.

Installation

Proper installation of the NPower series inverter will be achieved by considering the warnings which will be discussed in this section. Also, suitable wire and breaker selection for Npower series will be illustrated through information tables. Let’s speak about the warnings in the installation of inverter:

  • Be very careful when installing the batteries, especially flooded lead-acid batteries. Please wear eye protection, and have fresh water available to rinse if any contact with battery acid.
  • Keep the battery away from any metal objects, which may cause a short circuit of the battery.
  • Loose connections and corroded wires may result in high heat that can melt wire insulation, burn surrounding materials, or even cause a fire. Ensure tight connections and use cable clamps to secure cables and prevent them from swaying in motion.
  • Select the system connection cables according to the current density no higher than 5A/mm2.(In accordance with the National Electrical Code Article 690, NFPA70).
  • For outdoor installation, keep out of the direct sunshine and rain infiltration.
  • Please do not install the inverter in humid, greasy, flammable, explosive, dust accumulative or other severe environments.
  • AC output is high voltage, please do not touch the wiring connection.
  • When the fan is working, please do not touch it to avoid injury.

Warning notes should be considered to avoid any damages to the inverter and also the whole PV system. Wiring and installation mode should comply with national and local electrical code requirements. The table below helps to select the proper wire type according to the battery installed.

 

Model

Battery wire size

Breaker

NP260-12

6mm2/10AWG

DC/2P—40A

NP400-12

10mm2/8AWG

DC/2P—63A

NP600-12

16mm2/4AWG

DC/2P—80A

NP800-12

25mm2/4AWG

DC/2P—125A

NP1200-12

25mm2/4AWG

DC/2P—125A

NP260-22

4mm2/12AWG

DC/2P—20A

NP400-22

6mm2/10AWG

DC/2P—32A

NP600-22

6mm2/10AWG

DC/2P—40A

NP1000-22

16mm2/4AWG

DC/2P—63A

NP1200-22

16mm2/4AWG

DC/2P—63A

 

Thicker wires can be employed to lower the voltage drop and enhance the system performance for long distances between the battery and the inverter. Note that practical application should be considered in the proper selection of wire and breakers.

Air circulation is very important in the proper installation of the inverter, so ensure there is enough space for the installation (wall-mounted or horizontal), at least 150mm space shall be reserved for the outlet and inlet of the inverter.

 

 

 

As illustrated in the wiring diagram of the solar system, several additional accessories can be connected to the inverter by the RS485 communication port. This diagram can be considered as a reference to the proper wiring of the system.

The protection table beside the electrical specification of the EPEVER NPower series pure sine wave inverter will be illustrated from here on. More details can be found in the product’s user manual which is available on EPEVER website.

 

Protection

Condition

Phenomenon

Item

NP****-1*

NP****-2*

Overvoltage protection and

recover

Input voltage

Ui

16V(default)<Ui<16.2V

Modify ranges:15.5~16.2V

32V(default)<Ui<32.2V

Modify ranges:31~32.2V

The output is OFF after 5s

Green indicator fast flashing

Buzzer sounds

Ui≥16.2V

Ui≥32.2V

The output is OFF immediately

Green indicator fast flashing Buzzer sounds

Ui≤14.5V(default)

Modify ranges:14~15V

Ui≤29V(default)

Modify ranges:28~30V

Green indicator on solid

Output is ON

Low

voltage protection and

recover

Input voltage

Ui

10.5V<Ui<10.8V(default)

Modify ranges:10.5~11.3V

21V<Ui<21.6V(default)

Modify ranges:21~22.6V

The output is OFF after 5s

Green indicator slowly flashing

Buzzer sounds

Ui≤10.8V

Ui≤21.6V

The output is OFF immediately

Green indicator slowly flashing Buzzer sounds

Ui≥12.5V(default)

Modify ranges:12~13V

Ui≥25V(default)

Modify ranges:24~26V

Green indicator on solid

Output is ON

Input reverse polarity

Fully protected against battery reverse polarity, no damage will occur to the battery. Correct the wrong wiring to resume normal operation.

Over Temperature Protection and recover

The heat sink or internal temperature is higher than some value, the inverter isn’t working.

The heat sink or internal temperature is lower than some value, the inverter is working.

Overload protection and recover

Output powers

Rated power

Pe

S=1.25Pe

The output is OFF after the60s

Red indicator slowly flashing

Buzzer sounds

S=1.5Pe

The output is OFF after 10s

Red indicator slowly flashing

Buzzer sounds

S=1.8Pe

The output is OFF after 3s

Red indicator slowly flashing

Buzzer sounds

Load short circuit protection①

The output is OFF immediately Red indicator slowly flashing

Buzzer sounds

 

① When the overload protection or load short circuit protection is activated, the AC output would auto-recover for three times (the first time delays 5s, the second time delays for 10s and the third time delays for 15s). The fourth time will not recover.

The electrical and environmental specifications of EPEVER NPower series pure sine wave inverter will be discussed by incoming tables for different models of the inverters. Parameters and features of each model can be found in tables which helps the customer to select the proper inverter for desired application.

 

Electrical Specification

 

Item

NP260-12

NP260-22

Output Continuous Power

260W@25℃;260W@45℃

Surge Power

400W

Output Voltage

220/230 VAC (-8%~+3%)

220/230 VAC (±3%)

Output Frequency

50/60±0.2%

Output Wave

Pure Sine Wave

Output THD

THD≤3%(Resistive load)

Load Power Factor

0.2~1(VA≤ Continuous output power)

Rated input voltage

12VDC

24VDC

Battery Input voltage range

10.8~16VDC

21.6~32VDC

output efficiency of80% rated power①

81%

84%

Max. Rated Efficiency②

79%

82%

Max. Efficiency③

89%(80W)

90%(100W)

No-load Current

<0.4A

<0.3A

Rs485 Com. Port

5DC/200mA

Environmental parameters

Binding Post

Φ6mm

Overall dimension

365×212×97mm(L×W×H)

Mounting Dimension

220×193mm

Mounting hole size

Φ7mm

Weight

6.34kg

6.24kg

 

①DC input voltage is rated voltage, the load power is 80% of the continuous output power (25℃).

②DC input voltage is rated voltage, the load power is as same as the continuous output power (25℃).

③DC input voltage is rated voltage, max power with different load power.

 

Item

NP400-12

NP400-22

Output Continuous Power

400W@25℃;350W@45℃

Surge Power

700W

Output Voltage

220/230 VAC (-8%~+3%)

220/230 VAC (±3%)

Output Frequency

50/60±0.2%

Output Wave

Pure Sine Wave

Output THD

THD≤3%(Resistive load)

Load Power Factor

0.2~1(VA≤ Continuous output power)

Rated input voltage

12VDC

24VDC

Battery Input voltage range

10.8~16VDC

21.6~32VDC

output efficiency of 80% rated power①

81%

85%

Max. Rated Efficiency②

79%

84%

Max. Efficiency③

90%(100W)

91%(100W)

No-load Current

<0.5A

<0.3A

Rs485 Com. Port

5DC/200mA

Environmental parameters

Binding Post

Φ6mm

Overall dimension

386×215×99mm

Mounting Dimension

230×196mm

Mounting hole size

Φ7mm

Weight

6.24kg

7.86kg

 

①DC input voltage is rated voltage, the load power is 80% of the continuous output power (25℃).

②DC input voltage is rated voltage, the load power is as same as the continuous output power (25℃).

③DC input voltage is rated voltage, max power with different load power.

 

Item

NP600-12

NP600-22

Output Continuous Power

600W@25℃; 500W@45℃

Surge Power

1000W

Output Voltage

220/230 VAC (-8%~+3%)

220/230 VAC (±3%)

Output Frequency

50/60±0.2%

Output Wave

Pure Sine Wave

Output THD

THD≤3%(Resistive load)

Load Power Factor

0.2~1(VA≤ Continuous output power)

Rated input voltage

12VDC

24VDC

Battery Input voltage range

10.8~16VDC

21.6~32VDC

output efficiency of 80% rated power①

81%

85%

Max. Rated Efficiency②

80%

83%

Max. Efficiency③

89%(200W)

92%(160W)

No-load Current

<0.6A

<0.4A

Rs485 Com. Port

5DC/200mA

Environmental parameters

Binding Post

Φ8mm

Overall dimension

428×243×121mm

Mounting Dimension

260×220mm

Mounting hole size

Φ9mm

Weight

10.32kg

10.08kg

 

①DC input voltage is rated voltage, the load power is 80% of the continuous output power (25℃).

②DC input voltage is rated voltage, the load power is as same as the continuous output power (25℃).

③DC input voltage is rated voltage, max power with different load power.

 

Item

NP800-12

Output Continuous Power

800W@25℃;800W@45℃

Surge Power

1600W

Output Voltage

220/230 VAC (-8%~+3%)

Output Frequency

50/60±0.2%

Output Wave

Pure Sine Wave

Output THD

THD≤3%(Resistive load)

Load Power Factor

0.2~1(VA≤ Continuous output power)

Rated input voltage

12VDC

Battery Input voltage range

10.8~16VDC

output efficiency of 80% rated power①

83%

Max. Rated Efficiency②

81%

Max. Efficiency③

92%(100W)

No-load Current

<0.6A

Rs485 Com. Port

5DC/200mA

Environmental parameters

Binding Post

20*3mm(Rectangle)

Overall dimension

475×268×139mm

Mounting Dimension

270×245mm

Mounting hole size

Φ9mm

Weight

13.22kg

 

①DC input voltage is rated voltage, the load power is 80% of the continuous output power (25℃).

②DC input voltage is rated voltage, the load power is as same as the continuous output power (25℃).

③DC input voltage is rated voltage, max power with different load power.

 

Item

NP1000-22

Output Continuous Power

1000W@25℃;800W@45℃

Surge Power

1600W

Output Voltage

220/230 VAC (±3%)

Output Frequency

50/60±0.2%

Output Wave

Pure Sine Wave

Output THD

THD≤3%(Resistive load)

Load Power Factor

0.2~1(VA≤ Continuous output power)

Rated input voltage

24VDC

Battery Input voltage range

21.6~32VDC

output efficiency of 80% rated power①

85%

Max. Rated Efficiency②

82%

Max. Efficiency③

92%(200W)

No-load Current

<0.4A

Rs485 Com. Port

5DC/200mA

Environmental parameters

Binding Post

20*3mm(Rectangle)

Overall dimension

475×268×139mm

Mounting Dimension

270×245mm

Mounting hole size

Φ9mm

Weight

12.64kg

 

①DC input voltage is rated voltage, the load power is 80% of the continuous output power (25℃).

②DC input voltage is rated voltage, the load power is as same as the continuous output power (25℃).

③DC input voltage is rated voltage, max power with different load power.

 

Item

NP1200-12

NP1200-22

Output Continuous Power

1200W@25℃;1000W@45℃

Surge Power

2000W

Output Voltage

220/230 VAC (-8%~+3%)

220/230 VAC (±3%)

Output Frequency

50/60±0.2%

Output Wave

Pure Sine Wave

Output THD

THD≤3%(Resistive load)

Load Power Factor

0.2~1(VA≤ Continuous output power)

Rated input voltage

12VDC

24VDC

Battery Input voltage range

10.8~16VDC

21.6~32VDC

output efficiency of 80% rated power①

81%

85%

Max. Rated Efficiency②

78%

84%

Max. Efficiency③

92%(200W)

93%(300W)

No-load Current

<0.6A

<0.4A

Rs485 Com. Port

5DC/200mA

Environmental parameters

Binding Post

20*3mm(Rectangle)

Overall dimension

511×268×139mm

Mounting Dimension

300×245mm

Mounting hole size

Φ9mm

Weight

15.64kg

15.28kg

 

①DC input voltage is rated voltage, the load power is 80% of the continuous output power (25℃).

②DC input voltage is rated voltage, the load power is as same as the continuous output power (25℃).

③DC input voltage is rated voltage, max power with different load power.

 

Environmental Parameters

 

Working Temperature

-20℃~+45℃(Full load)

Storage Temperature

-35℃~ +70℃

Humidity

< 95%(N.C.)

Enclosure

IP20

Altitude

<5000m

(operates according to IEC62040 at a height exceeding 1000m)

 

Overall Dimensions of EPEVER NPower Series Inverters (NP260-12/22)

 

 

More details about the dimensions of the other models can be found in the product’s manual.

 

 

 

 

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