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INVT Solar Water Pump Inverter Applied in Different Places in the World – GD100-PV Series
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Abstract: With the development of the photovoltaic industry, the working efficiency of PV panel becomes better, benefited from the development of the electronic and internet, INVT invests in R & D resources for developing a new solution, making installation simple and reliable. The new product learns experience from last generation product, and the feedback from end-users all over the world. This article will introduce GD100-PV series solar water pump inverter.

Key words: GD100-PV, Photovoltaic, MPPT, PV water pump

1  Introduction
Received the feedback information from the solar market and end-users, we get the following suggestion:
(1)Reduce the PV panel quantity
Because the general solar inverter need high DC input voltage.
(2)Support single phase pump.
For the civil water pump, many motors are single-phase, but the solar inverter in the market don’t support single phase, only support 3-phase.
(3)Support AC/PV channels input together.
In the night, there isn’t PV input energy, the pump will stop. Some project needs to keep the pump working always.
(4)Easy commissioning
The last generation product, need to modify some parameters to be suitable for different pump, new inverter can work automatically.
(5)Support remote control
People can use mobile APP or website to monitor the running status, and control the system start or stop.
In order to meet the requirement from end-users, and solve the disadvantages of solar inverter in the market, INVT developed a new product GD100-PV. It solves all the problems the users mentioned.

2  Advantages of GD100-PV series
(1)Be suitable for single phase and 3-phase water pump.
(2)Built-in MPPT controller and excellent MPPT algorithm for various photovoltaic panels.
(3)IP54 cabinet solution, meets various harsh outdoor environments, and can be installed in the outdoor directly.
(4)Support the boost modular less than 2.2kW, increase the PV output voltage.
(5)Support PV input and AC grid input together, realize the switching function automatically, without human intervention.
(6)Include water level control logic, avoid dry run status and added full water protection.
(7)Start smoothly for reducing the voltage spike to motor.
(8)Low start voltage and wide input voltage range give more possibilities for accepting multi PV strings configuration and different type of PV module.
(9)Digital intelligent control can flexible adjust and set pump’s speed range. In addition to soft start function also can provide lightning protection, overvoltage, over current, overload protection function.

(10)Support GPRS modular, people can operate the system by website platform or mobile phone apps.

3  Photovoltaic
Photovoltaic (PV) is the name of a method of converting solar energy into direct current electricity using semiconducting materials that exhibit the photovoltaic effect. A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power. The process is both physical and chemical in nature, as the first step involves the photoelectric effect from which a second electrochemical process take place involving crystallized atoms being ionized in a series, generating an electric current.

Figure 1: Principle of photovoltaic

4  Two Solutions of GD100-PV
There are two solutions for different power rating pump, for the pump less than 2.2kW, the solution is as the figure 2, for the bigger power rating pump, the solution is as the figure 3.
For little power rating pump ≤2.2kW, when we configure the solar panels, the PV power is enough, but the PV output voltage is not enough, so it needs to buy more solar panel to increase the PV voltage.
GD100-PV supply the boost modular, support low PV voltage input and high DC voltage output, can reduce the PV quantity.

Figure 2: Boost module + GD100-PV

Figure 3: Auto-switch module + GD100-PV

The auto-switch modular can detect the PV output voltage, and send the signal to GD100-PV, inverter will control the contactor to turn on/off the AC input.

Figure 4: Water pumping system


Because the GD100-PV integrates so many features, such as reduce the PV input voltage, switch power input channel between DC and AC, high IP class IP54, and so on, the end users don’t need to maintain the solar inverter any more after setting the parameters in the first time.
After sunset the light will be weak, GD100-PV can detect the PV voltage is less than the setting point, it will change the power input channel from PV to AC grid automatically. If only PV channel input, GD100-PV will hibernate in the weak sun light and wake up automatically in the morning.

6  Application in site
Site 1
Pump: 2.2kW / 1 phase 220V / 50Hz / 10.3A / 2750rpm
Inverter: GD100-2R2G-SS25-PV-AS
Solar panel: POLY 300W/PC 9 PCS (9 in series)
AC power: single-phase 220V AC, 50Hz.
Address: Bangkok, Thailand

Site 2
Pump: 1.5kW /1phase 220V / 50Hz / 6.5A / 2975rpm
Inverter: GD100-1R5G-SS2-PV
Solar panel: Mono 270W/PC 8 PCS
Address: Pakistan

Site 3
Lacation: A farm in the desert nearby Dubai;
Time: Mar. 2017
Pump: 4KW/380V/9.5A
Inverter: GD100-5R5G-4-PV
Solar Panel: 18*300W/pcs
Save 60% cost for the farmer

Site 4
Lacation: A grapevine and Olive Tree Farm in Morroco
Time: Mar. 2017
Pump: 37kW/380V/74A & 4KW/380V/9.5A
Inverter: GD100-037G-4-PV & GD100-004G-4-PV
Panel: 180*300W/pcs
Used for 1 year
Save 60% cost
Advantage: Commissioning only with 5 minutes, run automatically, switch power grid automatically.

[1] Operation manual of GD100-PV series solar pumping inverter of Shenzhen INVT Electric Co., Ltd.

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