Should I choose a photovoltaic water pump VFD or a photovoltaic water pump inverter?

The photovoltaic water pump system is a system that directly uses the photovoltaic effect of solar cells to generate electricity, and then through a series of power electronics, motors, water machines and other control and implementation links to achieve water extraction in Rivers and Lakes or deep wells.

In industrial control products, photovoltaic frequency converters(VFD) and photovoltaic inverters are common core devices. This article will systematically analyze the differences between the two and provide selection suggestions to help you make a more suitable choice.  

Main differences

The following comparisons are based on VFD and inverters specifically designed for photovoltaic water pumps.

1. Power matching requirements: The VFDrequires 1.1-1.3 times the power to drive the water pump, while the inverter can drive the water pump with a power ratio of 1:1
2. Requirements for water pump type: The VFDcan drive a low-power DC water pump, with both AC and DC functions; Inverter drives AC water pump, mainly consisting of three-phase water pump.
3. Compatibility Requirements: VFDtypically use synchronous motors, while inverters can only use asynchronous motors
4. Complementary function of mains power: The VFDcan only be connected to the mains power when there is insufficient lighting; Inverters can work online with both mains and photovoltaic power simultaneously.
5. Protection level: The protection level of the frequency converter is IP20, and the protection level of the inverter is IP65
6. Installation environment: Most VFDonly support indoor installation or outdoor installation with protective boxes; The inverter can be installed outdoors normally

The following aspects can better help you decide whether to choose a VFD or an inverter?

1. Price factor: Inverters with the same power will be 4-10 times more expensive than VFD, and machines with higher power will be more expensive.
2. Power and application factors: VFDare generally chosen for civilian or low-power commercial use; High power, government bidding, etc. choose inverters
3. Environmental factors: The working temperature range of the VFDis usually between -10 ℃~50 ℃, and overheating requires heat dissipation (such as fans and heat sinks); Inverters can operate at temperatures ranging from -25 ℃ to 60 ℃; Suitable for outdoor remote areas and high-altitude regions.

TETRANCA H630 series photovoltaic water pump frequency converter, which has a similarity of up to 90% with mainstream I brand frequency converters, can achieve high-performance substitution and has the following characteristics:

-By using the Maximum Power Point Tracking (MPPT) algorithm, the output frequency can be adjusted in real-time according to changes in sunlight intensity, achieving maximum power point tracking and maximizing the use of solar energy. Even in low light conditions, the water pump can still operate;

-Adopting advanced IGBT power modules with high conversion efficiency, module suppliers can be designated;

-It can be upgraded to a waterproof rating of up to IP65, suitable for various environments;

-Internally equipped with lightning protection devices, highly reliable and adaptable to various natural weather conditions;

-LCD display, supporting RS485 and GPRS remote communication;

-Supporting complementary power supply and ensuring uninterrupted operation;