Key Component for Enhancing Energy Storage Inverter Efficiency – YMIN Capacitors

01 The Critical Role of Inverters in the Energy Storage Industry

The energy storage industry is an indispensable part of modern energy systems, and inverters play a multifaceted role in contemporary energy storage systems. These roles include energy conversion, control and communication, isolation protection, power management, bidirectional charging and discharging, intelligent control, multiple protection mechanisms, and strong compatibility. These capabilities make inverters a vital core component of energy storage systems.

Energy storage inverters typically consist of an input side, an output side, and a control system. Capacitors in inverters perform essential functions such as voltage stabilization and filtering, energy storage and release, improving power factor, providing protection, and smoothing DC ripple. Together, these functions ensure the stable operation and high performance of inverters.

For energy storage systems, these features significantly enhance overall system efficiency and stability.

02 Advantages of YMIN Capacitors in Inverters

1. High Capacitance Density
   At the input side of micro-inverters, renewable energy devices such as solar panels and wind turbines generate electricity that needs to be converted by the inverter within a short time. During this process, the load current can increase sharply. YMIN capacitors, with their high capacitance density, can store more charge within the same volume, absorb part of the energy, and assist the inverter in smoothing voltage and stabilizing current. This enhances conversion efficiency, enabling the DC-to-AC transformation and ensuring the efficient delivery of current to the grid or other demand points.
2. High Ripple Current Resistance
   When inverters operate without power factor correction, their output current may contain significant harmonic components. Output filtering capacitors effectively reduce harmonic content, meeting the load’s requirements for high-quality AC power and ensuring compliance with grid interconnection standards. This minimizes the negative impact on the grid. Additionally, on the DC input side, filtering capacitors further eliminate noise and interference in the DC power source, ensuring cleaner DC input and reducing the influence of interference signals on subsequent inverter circuits.
3. High Voltage Resistance
   Due to fluctuations in sunlight intensity, the voltage output from photovoltaic systems can be unstable. Moreover, during the switching process, power semiconductor devices in inverters generate voltage and current spikes. Buffer capacitors can absorb these spikes, protecting power devices and smoothing the voltage and current variations. This reduces energy loss during switching, enhances inverter efficiency, and prevents power devices from being damaged by excessive voltage or current surges.

03 YMIN Capacitor Selection Recommendations

1）Photovoltaic inverter

Snap-in Aluminum Electrolytic Capacitor

Low ESR, high ripple resistance, small size

2）Micro-inverter

Liquid lead aluminum electrolytic capacitor:

Sufficient capacity, good characteristic consistency, low impedance, high ripple resistance, high voltage, small size, low temperature rise, and long life.

Supercapacitor

Wide temperature resistance, high temperature and high humidity, low internal resistance, long life

Application Terminal	Series	Products Picture	Heat resistance and life	Rated voltage (surge voltage)	Capacity	Dimension
Micro-inverter (RTC clock power supply)	SM		85 ℃ 1000Hrs	5.6V	0.5F	18.5*10*17
					1.5F	18.5*10*23.6

Liquid chip aluminum electrolytic capacitor:

Miniaturization, large capacity, high ripple resistance, long life

3) Portable energy storage

Liquid lead type aluminum electrolytic capacitor:

sufficient capacity, good characteristic consistency, low impedance, high ripple resistance, high voltage, small size, low temperature rise, and long life.

Summary

YMIN capacitors enable inverters to improve energy conversion efficiency, adjust voltage, current and frequency, enhance system stability, help energy storage systems reduce energy loss, and improve energy storage and utilization efficiency through their high voltage resistance, high capacitance density, low ESR and strong ripple current resistance.