Differences between Photovoltaic Inverters and Energy Storage Inverters

As an efficient, green and environmentally friendly renewable resource, solar photovoltaic has been gradually used in various fields at this stage. Therefore, the development trend of the photovoltaic industry is in an orderly manner, but photovoltaic power generation only generates power during the day, and the power of power generation is affected by the weather and has unpredictability. When it comes to the above problems, the energy storage inverter can perfectly handle: when the load is low, the output electric energy is stored in the battery, and the stored electric energy is released during the peak load, reducing the pressure on the power grid; when the power grid fails, switch back to off-grid mode powered again.

So what is the difference between (PV) photovoltaic inverters and energy storage inverters?

The key is reflected in the following three points: the self-use rate of the energy storage inverter is as high as 80%, while the self-use rate of the traditional photovoltaic inverter is only 20%; Inverters are still working efficiently; in the context of continuous decline in grid-connected power generation subsidies, energy storage inverters are more profitable.

"GB_T34133-2017 Energy Storage Inverter Test Standard" testing standard

The sustainable development of the energy storage inverter industry is naturally inseparable from the relative national industry standards. "GB_T34133-2017 Energy Storage Inverter Test Standard" is the standard specification for the energy storage inverter industry. China Electric Power Research Institute, Sungrow Power Supply Co., Ltd., Beijing Qunling Energy Technology Co., Ltd., and XJ Power Supply Co., Ltd. were jointly drafted and officially implemented on February 1, 2018.

"GB_T34133-2017 Test Standards for Energy Storage Inverters" specifies charging and discharging inspections, grid-connected and off-grid adjustment inspections, high-efficiency inspections, load capacity inspections, power quality inspections, power control inspections, grid applicability inspections, and low-voltage ride-through capabilities. Testing, anti-islanding protection performance testing, environmental and safety testing, protection function testing, electromagnetic compatibility testing and other testing standards. Senior engineers familiar with this industry will find that most of the test standards are the same as those for photovoltaic inverters, except that the test requirements for dedicated energy storage inverters have been increased in Chapter 6.5 "Power Quality Testing".

After reading this test standard in detail, it is not difficult to find that in addition to testing harmonics and inter-harmonics, it is also necessary to estimate and count the test values of harmonics and inter-harmonics within 10 minutes. The difficulty of the test, and the equipment should have the three functions of detection, storage, and statistical analysis. After mastering the testing requirements of customers, Zhiyuan Electronics developed a special test plug-in on the power analyzer for "power quality testing". Complex test items are converted into one-click operations. Senior engineers only need to use the power analyzer to conduct a complete test on the harmonics and interharmonics of the energy storage inverter, and the test results will be displayed in the form of a report.