Micro-inverters generally have a single unit capacity of less than 5kW and are applied to a small number of PV modules. They enable precise

adjustment and monitoring of the output power of each module, as well as MPPT, and they are connected to the grid after inverter conversion,

therefore particularly suitable for small PV systems such as those on rooftops or balconies. For micro-inverter testing, Kewell provides testing

equipment that features high accuracy, fast dynamic response, and high efficiency. The DC side supports dynamic and static MPPT testing,

simulation of I-V curves of solar array, capable of simulating PV characteristics under different environmental conditions such as cloudy and sunny

days. The AC side supports testing conditions such as voltage frequency adaptability, power quality, and fault ride-through simulation, true to

real-world application scenarios.

The current market is dominated by string PV inverters, which typically have a power rating of less than 100KW. They operate by performing MPPT individually on multiple photovoltaic modules and then connecting to the grid via string inverters, there by achieving higher power generation efficiency. These inverters are mainly used in smaller distributed PV power stations. In response to string inverter testing, Kewell has launched test equipment with high accuracy, fast dynamic response, and high efficiency. On the DC side, it supports functions such as dynamic and static MPPT testing, simulation of I-V curves of solar array, and precise simulation of photovoltaic characteristics. On the AC side, it supports power quality tests including three phase unbalance and harmonic superposition, as well as high and low voltage ride-through tests. Kewell's string inverter test solution employs high-precision, high-efficiency power supplies to accurately simulate various types of modules and grid characteristics across different regions, enabling precise testing for string inverters.

The pursuit of green and low-carbon development has become a global consensus. Many countries worldwide have explicitly outlined their goals. Central inverters typically feature power ratings above 500kW, with their actual test input and grid-connected power being even higher, and are

mainly used in large-scale above-ground centralized photovoltaic power stations with uniform illumination. Facing the growing testing demands of central inverters, Kewell has launched testing equipment that integrates high power density, high efficiency, and fast dynamic response. On the DC side, it supports simulation of the I-V curve of solar arrays and accurate simulation of photovoltaic characteristics, with built-in standard models including EN50530 and Sandia. On the AC side, it supports power quality tests such as three-phase unbalance and harmonic superposition, as well as high and low voltage ride-through test, providing a simpler testing platform with lower costs. Kewell’s PV testing solutions support around-the-clock simulations for inverter power generation and grid-connection across different scenarios, utilizing high-power/ultra-high-voltage test power supplies to simulate large-scale PV arrays and grid with higher voltage levels, meeting the requirements of PV industry customers and testing institutions.

With the increasingly widespread application of energy storage in power systems, its potential has also been gradually demonstrated, especially in areas such as energy dispatch, peak shaving and valley filling, smooth output of renewable energy, and microgrid support. In response to current testing requirements for energy storage converters, Kewell adopts a new SiC design and introduces equipment featuring ultra-high power density, high accuracy, and fast dynamic response. On the DC side, it supports simulation of seven fixed types of batteries, custom batteries, and 1st/2nd/3rd-order batteries, eliminating the need for additional battery configurations, thereby cutting costs and improving efficiency. On the AC side, it supports power quality tests such as three-phase unbalance and harmonic/inter-harmonic superposition, as well as high and low voltage ride through tests, increasing testing efficiency. Kewell boasts technical expertise and a wealth of applications in the field of energy storage testing, providing customers with safe and reliable PCS testing solutions.

Household photovoltaic and energy storage systems are capable of flexible load regulation. During off-peak periods of electricity consumption, the household battery packs will automatically charge, and they constitute hybrid, coupled, or off-grid household photovoltaic and energy storage systems together with PV modules.

To accommodate the testing requirements of household hybrid PV and storage converters, the DC side of the Kewell equipment satisfies the

testing requirements for both battery simulation and PV simulation, while the AC side supports tests related to power quality, grid adaptability, fault ride-through, and so on. Kewell’s test solution for household hybrid PV and storage converters comprehensively simulates its energy conversion scenarios, ensuring its safe and stable performance.