KEWO Solar Water Pumping System And Solar Pump Drive

Fully automatic system using variable speed drive compatible with AC, 3-phase, submersible and surface mount pumps, and high efficiency PMSM Pumps. The system is composed of a PV generator, a pump and a solar pump drive. Based on the design philosophy that it is more efficient to store water rather than electricity, there is no energy storing device such as storage battery in the system. The system is prepared to be combined with a elevated water storage, e.g. water tower or an uphill tank installation.

Presentation
KEWO Solar Water Pumping Solution is a fully automatic system designed to provide water at affordable cost for people with limited or no access to electricity. It uses the most advanced S300/3200 variable speed drive to regulate the speed of a 3-phase AC motor depending upon the solar energy available from the solar panel.

How does it work ?
An arrays of solar panels generates the power and voltage required for the SG300/3200 Solar inverter to drive the motor. The solar drive converts the DC voltage input to a 3-phase AC output with variable voltage and frequency. The MPPT algorithm of solar drive extracts maximum power available from the solar panels during the day and operates the motor at variable speed based on the power input to the drive. The frequency range in which the drive operates depends upon the motor speed, hydraulic system and the power available from the solar panel. As the sunshine varies during the day, power input to the drive varies and the Solar drive generates variable V/F ratio thus controlling the speed of the motor, which in turn regulates the pump impeller speed. Water Level Sensor is used only when the water is pumped to overhead tank. 
Benefits
• Pumping of water in for irrigation for drinking water supply in off grid areas, easy installation.
• Farmer can cultivate multiple crops through out the year in off grid areas 
• Farmer can save their time spent in collecting and transporting water.
• Lower operation expense compared to diesel pumps 
• Zero emission of green house gases.
• Reduced load on national grid.
Applications
Irrigation of land, domestic water supply, fish farming, livestock, swimming pool, fountain, drip irrigation & sprinkler, industrial application, swimming pool…

Features of solar pumping system


System connection and commissioning.
An enhanced version of KEWO Automation AC Drive( variable speed drive of motor speed and torque control), compatible with DC power and AC grid input.
Note*: Only allow one power source input at a time.
1. Connect DC power Positive ( P ) and Negative ( N ) terminals to input R, T terminals of drive.
2. Connect output U, V, W terminals of drive to 3 phase AC pumps. ( Not drive for DC pumps and Single AC pumps).
3.Connect water level sensor to drive if need water tank level detecting.
4.Connect remote controller GPRS module ( option) if need remote monitor controlling function.
5. IP54 solar pump drive cabinet customization make is available including( AC/DC switchover, AC and DC breaker..), or IP54 module also is available.

Easy installation and commissioning.
1.Dc voltage of solar arrays in serials need large than 1.15 times of Vmpp of drives.
For example: For 4T series, recommend 540V*1.15=621V; For 2S series, recommend 311*1.15=357V. (Voc)
2.The selecting power of solar arrays need large than 1.3 times power of total pumps.
For example, 0.9kw above for 0.75kw pumps, 2.86kw above for 2.2kw pumps.
3.Commissioning steps.( Please wait 30s after switching on for Voc detecting by iverter itself.) 

 Solar arrays module selecting

Selecting Solar Arrays Matching Selecting

Solar pumps inverter model

Maximum Input DC current

Solar arrays open circuit voltage specification

Open circuit voltage range  Voc 21V±2V

Open circuit voltage range Voc 31V±2V

Open circuit voltage range Voc 43V±2V

Power±3WP

Short circuit current

Series, parallel No.

Power±3WP

Short circuit current

Series, parallel No.

Power±3WP

Short circuit current

Series, parallel No.

Inverter rated current

General type 4T series : 350 to 800 VDC or 380 to 460VAC input, (MPPT 486 to 750VDC, Voc 620VDC)

SG320-0K7GB-4T

4.6A

30WP

2.75A

30*1

2.3A

SG320-1K5GB-4T

7A

60WP

3.48A

30*1

3.7A

SG320-2K2GB-4T

10A

90WP

5.5A

30*1

5A

SG320-4K0GB-4T

17A

85WP

4.7A

28*2

8.5A

SG320-5K5GB-4T

23A

180WP

7.33A

19*2

13A

SG320-7K5GB-4T

32A

240WP

8.81A

20*2

200WP

7.32A

15*3

17A

SG320-011GB-4T

48A

180WP

7.33A

20*4

240WP

7.32A

15*4

25A

SG320-015GB-4T

64A

240WP

8.81A

20*4

240WP

7.32A

15*5

32A

SG300-018GB-4T

76A

240WP

8.81A

20*5

240WP

7.32A

15*6

38A

SG300-022GB-4T

80A

240WP

8.81A

20*6

270WP

7.32A

15*7

45A

SG300-030GB-4T

90A

240WP

8.81A

20*8

240WP

7.32A

15*10

60A

General type 2S series : 150 to 450 V DC or 200 to 240 VAC input, (MPPT 280 to 375VDC, Voc 350VDC)

SG320-0K7GB-2S

7A

30WP

2.75A

17*2

4A

SG320-1K5GB-2S

14A

60WP

3.48A

17*2

7A

SG320-2K2GB-2S

20A

90WP

5.5A

17*2

10A

SG320-4K0GB-2S

32A

90WP

5.5A

17*3

16A

Note: The required input solar panel voltage is 1.15 times of solar drive DC bus voltage. For example: For4T series, recommend 540V*1.15=621V; for 2S series, recommend 311*1.15=357V.

The required power of solar arrays is 1.3 times of rated power of drives, shouldn’t less than 1.2 times of rated power of inverter. For example, 7R5G, the required power is 7500*1.3=9750w.

The current of solar arrays selecting approximate to rated current of solar drive is acceptable.

GPRS remote control (optional)

Functions of GPRS module establishing
1. Working Status Monitoring;
2. Inverter Control and parameters review and modify
3. Positioning can see where the solar pump system working
4.History Data Record, possible record 3 months working data of system

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