High-Reliability Selection and Application of MLCC for PV Energy Storage - Failure Mechanism Scenario-Based Selection

High-Reliability Selection and Application of MLCC for PV Energy Storage — Failure Mechanism, Scenario-Based Selection, Protection Design and Implementation Guide for 25-Year Long-Life Operating Conditions

Company: Dongguan Musen Laidun Electronic Technology Co., Ltd.

PV MLCC, energy storage MLCC, inverter capacitor, PCS capacitor, PV BMS capacitor, high-voltage MLCC, 25-year long-life capacitor, outdoor corrosion-resistant capacitor, salt spray protection MLCC

mu sen Introduction

Driven by the global dual-carbon strategy, photovoltaic power generation and electrochemical energy storage have become the core pillars of the new energy power system. The installed capacity of core equipment such as string inverters, central inverters, energy storage PCS, BMS battery management systems and combiner boxes continues to grow rapidly. PV energy storage equipment is generally deployed in harsh environments such as outdoor wilderness, Gobi beaches, coastal power stations, plateaus and mountainous areas, facing multiple reliability challenges including wide temperature cycling from -40℃ to 85℃, long-term high-voltage DC bias, salt spray sulfidation corrosion, sand dust and humidity, lightning surges, continuous fan vibration and 25-year ultra-long design life.

As the basic passive component with the largest consumption in PV energy storage equipment, covering all power and signal circuits, the reliability of MLCC directly determines the service life, power generation efficiency and operation and maintenance cost of the power station. There are widespread cognitive deviations in selection in the industry: a large number of solutions use ordinary industrial-grade X7R capacitors, ignoring PV-specific problems such as high-voltage bias aging, outdoor corrosion, wide temperature cycling and long-life attenuation, resulting in concentrated failures such as capacitance attenuation, excessive ripple, sampling drift, corrosion open circuit and pulse breakdown 3 to 5 years after equipment commissioning, which greatly increases power station operation and maintenance costs, and even causes safety accidents such as complete machine fire.

This white paper focuses on full-scenario applications of PV energy storage, deeply disassembles six exclusive failure mechanisms, provides standardized selection solutions for four core equipment: inverters, energy storage PCS, BMS and combiner boxes, supports full-process design specifications for high-voltage protection, environmental protection and structural protection, and establishes a 25-year long-life MLCC reliability design system combined with real power station rectification cases and implementable selection checklists, helping PV energy storage enterprises improve equipment reliability, reduce full-life-cycle operation and maintenance costs, and efficiently complete domestic substitution upgrading of core components.

1. Seven Fatal Misconceptions in PV Energy Storage MLCC Selection

1.1 Root Causes of Late-Stage Failures in 90% of Power Stations

1. Misconception 1: Withstand voltage compliance is sufficient, ignoring DC bias capacitance attenuation
   Truth: Ordinary X7R capacitors used in high-voltage busbars can have capacitance attenuation of 30% to 50% under 80% rated voltage bias, resulting in greatly reduced actual filtering and energy storage capacity, leading to excessive ripple and reduced efficiency. Long-term aging further aggravates the attenuation, and failure can occur in 3 to 5 years.
2. Misconception 2: Outdoor equipment has housing protection, so corrosion-resistant capacitors are not needed
   Truth: Coastal salt spray, industrial sulfide gas and desert sand dust will enter the equipment through heat dissipation gaps and adhere to the capacitor surface after condensation; ordinary nickel-tin plating cannot resist corrosion for a long time, and terminal corrosion open circuit will occur in 2 to 3 years, which is a high-incidence failure in coastal power stations.
3. Misconception 3: PV is a low-frequency scenario and does not require high-frequency characteristics
   Truth: The IGBT switching frequency of inverters reaches tens of kHz to hundreds of kHz, which will generate a large number of high-frequency harmonics and spikes; ordinary large-capacity MLCC presents inductive characteristics at high frequencies and cannot absorb high-frequency noise at all, leading to excessive EMI and increased risk of IGBT spike breakdown.
4. Misconception 4: Ordinary X7R can meet the 25-year life requirement
   Truth: Consumer-grade / ordinary industrial-grade X7R is only designed according to 1000-hour aging verification. Under long-term operation at 85℃ high temperature + high voltage bias, the annual capacitance attenuation exceeds 3%, and the 25-year cumulative attenuation far exceeds the allowable range, which simply cannot support stable operation throughout the life cycle.
5. Misconception 5: Sampling circuit capacitors are not important, ordinary precision is sufficient
   Truth: The voltage and current sampling accuracy of PV inverters and BMS directly affects power generation efficiency and battery safety; ordinary dielectrics have large temperature drift, and sampling deviation at high and low temperatures will lead to reduced MPPT tracking efficiency and battery overcharge / overdischarge, and long-term aging will further aggravate accuracy drift.
6. Misconception 6: Vibration only affects mechanical structures and has nothing to do with capacitors
   Truth: The continuous operation of inverter fans and cooling fans generates full-band vibration, coupled with transportation and installation shocks, which will cause fatigue microcracks in large-package MLCC; there is no abnormality in the initial stage, and cracks expand after several years of operation to cause open circuit and leakage, which is a typical delayed failure.
7. Misconception 7: Domestic capacitors cannot meet the high reliability requirements of PV
   Truth: Leading domestic MLCC manufacturers have launched special series for PV energy storage, which have passed 2000-hour extended high-temperature bias, temperature cycling and salt spray tests, with reliability benchmarking against international first-tier brands; meanwhile, they have significant advantages such as fast delivery, excellent cost and localized technical support, and have achieved batch introduction in leading inverter manufacturers.

2. Six Exclusive Failure Mechanisms of PV Energy Storage MLCC

2.1 Long-Term Aging Failure under High-Voltage DC Bias

Failure Phenomenon: After 3 to 5 years of power station operation, the DC bus filter capacitance of the inverter is greatly attenuated, the output ripple increases, the conversion efficiency decreases, and IGBT damage occurs in severe cases.

Mechanism Analysis: The DC bus voltage of PV inverters and energy storage PCS is as high as 1500V. MLCC is under long-term high-voltage DC bias, and the electric domains of Class II ferroelectric dielectrics are gradually polarized and pinned under the action of electric field, the number of reversible electric domains continues to decrease, and the dielectric constant gradually decreases, manifested as irreversible capacitance attenuation. For ordinary X7R dielectric under 80% rated voltage bias, the 1000-hour capacitance attenuation can reach more than 15%, and the long-term 25-year operation attenuation far exceeds the design margin. At the same time, high-voltage bias will accelerate ion migration inside the dielectric, and grain boundary defects gradually expand, eventually leading to dielectric breakdown short circuit.

2.2 Thermal Fatigue Failure from Outdoor Wide Temperature Cycling

Failure Phenomenon: For power stations in plateaus and deserts with large diurnal temperature differences, the equipment failure rate is significantly higher than that in mild areas, and failures break out concentratedly in winter and summer.

Mechanism Analysis: Outdoor equipment experiences daily temperature cycling, with low temperature up to -40℃ in winter and internal high temperature of chassis up to 85℃ in summer, and some sealed equipment even exceeds 100℃. Under repeated temperature cycling, the difference in thermal expansion coefficients among ceramic body, metal terminal and PCB substrate generates periodic shear stress, gradually leading to terminal interface peeling and ceramic body fatigue microcracks. After crack propagation, it will cause capacitance offset and increased leakage, eventually leading to open circuit or breakdown failure. The larger the temperature cycling amplitude and the more cycles, the faster the failure rate.

2.3 Salt Spray and Industrial Corrosion Failure

Failure Phenomenon: For power stations around coastal and industrial areas, batch functional abnormalities occur after 2 to 3 years of equipment operation. Disassembly shows that MLCC terminals are blackened, whitened, with peeling plating and electrode corrosion disconnection.

Mechanism Analysis: Corrosive gases such as chloride ions in coastal atmosphere and hydrogen sulfide / sulfur dioxide in industrial areas enter the interior through equipment heat dissipation channels and adhere to the capacitor surface under condensation. Ordinary three-layer nickel-tin terminals have microscopic pores. After the corrosive medium penetrates the plating layer, it reacts with the internal silver electrode to generate high-resistance silver sulfide and silver chloride, gradually leading to electrode contact failure and circuit open circuit. At the same time, corrosion will expand from the terminal to the inside of the ceramic body, causing surface breakdown risk. This failure has strong batch characteristics and is the number one MLCC failure type in coastal power stations.

2.4 IGBT Switching Pulse Impact Breakdown Failure

Failure Phenomenon: Occasional short-circuit breakdown occurs in power-stage MLCC of inverters and PCS, accompanied by IGBT burnout, mostly occurring in high-power and high-switching-frequency models.

Mechanism Analysis: High-speed IGBT switching actions generate steep voltage spikes and pulse impacts with extremely high dv/dt. Ordinary MLCC dielectrics have weak pulse resistance, and the transient local electric field strength exceeds the dielectric breakdown threshold, causing instantaneous breakdown short circuit. At the same time, high-frequency pulses will cause dielectric loss heating, which superimposes with ambient high temperature to further reduce the breakdown voltage, forming a vicious circle. For MLCC with ordinary DC withstand voltage specification, the pulse withstand voltage is only 20% to 40% of the DC withstand voltage. If pulse parameters are ignored during selection, breakdown failures are very likely to occur.

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2.5 Continuous Vibration and Installation Stress Cracking Failure

Failure Phenomenon: High-power inverters with fan cooling and outdoor wall-mounted equipment have occasional failures after several years of operation, no abnormality in static test, and failure recurrence in vibration environment.

Mechanism Analysis: The operation of cooling fans generates continuous low-frequency vibration, which is transmitted to the PCB board through structural parts. Large-package MLCC has heavy self-weight, and solder joints and ceramic body bear alternating shear stress, resulting in fatigue microcracks after long-term accumulation. At the same time, PCB deformation during equipment installation and screw locking will introduce mechanical stress, and impact during transportation will also produce hidden cracks. These microcracks close under static state with normal electrical performance; they open under vibration or temperature change, causing leakage and parameter offset, making the fault difficult to troubleshoot and locate.

2.6 Lightning Surge and Grid Overvoltage Breakdown Failure

Failure Phenomenon: After thunderstorm weather, batch equipment damage occurs in the power station, and the failure points are mostly breakdown short circuit of front-end filtering and lightning protection circuit MLCC.

Mechanism Analysis: Outdoor PV equipment directly faces the risk of lightning induced surges, and the grid side will also have transient overvoltage caused by load switching and short circuit. Although there are lightning protection devices such as varistors and TVS at the front end, these devices have response delay, and residual surge pulses will still be applied to the rear-end MLCC. Ordinary MLCC has poor surge tolerance, and the dielectric breaks down instantly under high-energy pulses, causing short-circuit faults and even safety accidents such as fire and machine explosion.

3. Performance Grade and Selection Benchmarking of PV Energy Storage MLCC

4. Standardized MLCC Selection Solutions for Four Core PV Energy Storage Equipment

4.1 PV Inverter Scenario: Triple Harsh Conditions of High Voltage, High Frequency and Outdoor

Covered Models: string inverters, central inverters, microinverters

Core Pain Points: 1500V high-voltage DC bus, IGBT high-frequency switching pulses, outdoor wide temperature cycling, salt spray sand dust corrosion, 25-year design life

Selection Specifications:

• DC bus filtering / energy storage circuits: Select PV-specific high-voltage low-bias-attenuation X8R series, with voltage derating ≥ 3 times, rated voltage covering 1kV ~ 3kV; adopt thickened nickel sulfidation-resistant terminals, soft termination structure optional for large packages; dielectric formula optimized for DC bias, with capacitance attenuation ≤ 10% under 80% rated voltage, ensuring that capacitance still meets design requirements after 25 years of long-term aging;
• IGBT spike absorption / snubber circuits: Select high-pulse withstand voltage C0G / X8R series, small package low ESL design, arranged close to IGBT pins; excellent high-frequency characteristics, can effectively absorb switching spikes, reduce dv/dt impact, protect power devices, and reduce EMI radiation at the same time;
• AC output filtering circuits: Select high-frequency low-loss X8R / C0G series, withstand AC pulse voltage, low dielectric loss reduces heating; adapt to inverter LCL filter network to ensure output power quality;
• Control board sampling and reference circuits: 100% adopt C0G high-precision dielectric, ±1% / ±5% precision optional, temperature drift ±30ppm/℃, almost zero aging; ensure voltage and current sampling and MPPT tracking accuracy, improve overall power generation efficiency;
• Auxiliary power supply and drive circuits: Wide temperature X8R series, stable parameters in full temperature range, ensuring reliable operation of control circuits and drive circuits.

4.2 Energy Storage PCS Bidirectional Converter Scenario: Bidirectional Stress and Long-Term Cycling Conditions

Covered Models: energy storage PCS, bidirectional DC-DC, household energy storage all-in-one machines

Core Pain Points: bidirectional voltage stress of charge and discharge, high-frequency design, large current ripple on battery side, long-term uninterrupted operation, coordinated life requirement with batteries

Selection Specifications:

• DC side high-voltage bus capacitors: Adopt long-life high-voltage X8R series, excellent dielectric stability under bidirectional voltage stress; anti-aging formula design, 1000-hour high-temperature bias capacitance attenuation ≤ 3%; match the voltage level of LFP / ternary battery systems, with voltage derating ≥ 3 times;
• LLC resonant circuit capacitors: Select high-frequency low-loss C0G / X8R series, high Q value, low loss, accurate and stable resonant frequency; withstand large current ripple, low heating, ensuring LLC conversion efficiency;
• Battery side filter circuits: Low ESR large-capacity X8R combination, low heating under large current ripple; optimized temperature characteristics to ensure consistent filtering effect in full temperature range;
• EMS control and sampling circuits: Full C0G high-precision capacitors to ensure accurate voltage, current and temperature sampling, providing reliable data support for the energy management system.

4.3 Energy Storage BMS Battery Management System Scenario: High Precision, High Reliability and Strong Anti-Interference

Covered Products: energy storage BMS, cell acquisition unit, main control unit, high-voltage acquisition module

Core Pain Points: high voltage sampling accuracy requirements, wide temperature environment of battery packs, high-voltage isolation requirements, long-term operation parameter drift affecting battery safety

Selection Specifications:

• Cell voltage sampling circuits: Full line adopts C0G high-precision capacitors, ±1% precision grade, extremely low temperature coefficient; fundamentally eliminate sampling deviation caused by temperature drift and aging, ensure SOC estimation accuracy, avoid battery overcharge and overdischarge, and improve battery safety and cycle life;
• Current sampling and signal conditioning circuits: C0G low-loss, high-linearity capacitors, no harmonic distortion, ensuring accurate sampling signals of shunts and Hall sensors;
• High-voltage isolation and safety circuits: Select high-voltage MLCC meeting safety requirements, high insulation and high withstand voltage, meeting reinforced insulation requirements; C0G dielectric has long-term stable insulation performance without aging breakdown risk;
• Power supply decoupling and filtering circuits: Wide temperature X8R series, stable parameters in full temperature range from -40℃ to 125℃, adapting to the complex temperature environment of battery packs.

4.4 Combiner Box and PV Tracker Scenario: High Reliability in Harsh Outdoor Environment

Covered Products: DC combiner boxes, smart combiner boxes, PV tracker controllers

Core Pain Points: direct outdoor exposure environment, large temperature difference, humid and dusty, many lightning surges, high maintenance cost

Selection Specifications:

• High-voltage input filtering circuits: High-voltage X8R anti-aging series, high pulse withstand voltage, resisting residual impact of lightning surges; sulfidation-resistant terminals, adapting to complex outdoor atmospheric environment;
• Monitoring and sampling circuits: C0G high-precision capacitors, no parameter drift during long-term outdoor operation, ensuring accurate monitoring data of current, voltage and temperature;
• Communication and interface circuits: High-frequency C0G filter capacitors, suppress line interference, ensure stable and reliable RS485, power line carrier and wireless communication;
• Power supply protection circuits: High-voltage surge-resistant MLCC, combined with TVS and varistors to form multi-level protection, improving the overall lightning protection capability of equipment.

5. Full-Dimensional Reliability Protection Design Specifications for PV Energy Storage MLCC

5.1 Electrical and Derating Design Protection

• Voltage derating standard: Voltage derating of DC bus main circuits ≥ 3 times; IGBT absorption and spike circuits derating ≥ 4 times; sampling and signal circuits derating ≥ 2 times; meanwhile, calculate pulse withstand voltage margin to ensure sufficient safety margin under the worst surge conditions;
• Temperature derating standard: The core operating temperature of capacitors is controlled within 80% of the maximum dielectric temperature; the long-term operating temperature of X8R dielectric shall not exceed 100℃ to avoid high-temperature accelerated aging; capacitors close to heating devices shall be treated with heat insulation or heat dissipation;
• Capacitance margin design: Considering the superposition of three factors: DC bias attenuation, temperature drift and long-term aging attenuation, reserve ≥ 30% margin for main circuit capacitance design to ensure that capacitance still meets circuit requirements at the end of 25-year life;
• Gradient filtering design: Adopt multi-capacitance gradient combination of "large-capacity energy storage + medium-capacity filtering + small-capacity high-frequency decoupling" to cover the full frequency band from DC to hundreds of MHz; control adjacent capacitance gradient within 10 times to avoid anti-resonance peaks.

5.2 PCB Layout and Stress Protection Design

• High-voltage creepage design: For MLCC in high-voltage circuits of 1500V system, the creepage distance between terminals and from terminals to ground shall meet pollution degree 2 requirements, ≥ 8mm; further increase creepage distance or slot isolation in high-humidity and high-dust areas; avoid residual solder beads and conductive debris on capacitor surface to prevent surface flashover;
• Mechanical stress avoidance: Large-package MLCC of 0805 and above are prohibited to be arranged within 5mm around screw holes, installation fixing points, board edges and depaneling lines; capacitor length direction is perpendicular to PCB bending direction to reduce bending stress; large-package capacitors prefer soft termination process to absorb mechanical and thermal stress;
• Heat dissipation optimized layout: High-voltage and large-ripple capacitors are kept away from heat sources such as IGBTs, inductors and transformers, with spacing ≥ 5mm; uniform heat dissipation paths are designed on the power board to avoid local hot spots causing accelerated capacitor aging; copper foil in high-current circuits is wide enough to reduce copper loss heating;
• High-frequency layout optimization: Absorption capacitors and decoupling capacitors are as close as possible to IGBTs and chip pins, with vias next to pads to reduce parasitic inductance; high-frequency circuits adopt shortest path and minimum loop area design to reduce EMI radiation and parasitic parameter effects.

5.3 Environmental and Process Protection Design

• Anti-corrosion system protection: Select thickened nickel sulfidation-resistant MLCC at device level, and precious metal terminals optional for coastal heavy corrosion scenarios; select low-sulfur PCB substrates, sulfur-free flux and low-sulfur sealant / foam at material level to eliminate endogenous sulfur sources; design salt spray filtration and dust screens at structural level to reduce corrosive medium entry; spray high-density conformal coating on the whole machine at process level, with thickness ≥ 50μm, completely covering capacitor terminals and ceramic body to form isolation protection;
• Moisture and condensation protection design: Outdoor equipment adopts sealed structure, matched with waterproof breathable valves to balance internal and external air pressure and reduce condensation caused by temperature difference; control board is sprayed with conformal coating to avoid leakage and corrosion caused by condensation water film; heating and dehumidification devices can be added in low-temperature and high-humidity areas;
• SMT process control: Strictly implement reflow soldering temperature curve, heating rate ≤ 2℃/s, peak temperature 245±5℃, to avoid internal stress of ceramic body caused by rapid heating and cooling; accurately control solder volume with stencil to avoid pulling stress caused by uneven solder at both ends; replace manual breaking with routing depaneling to reduce depaneling mechanical stress;
• Assembly process control: Use torque screwdrivers to lock screws, tighten in diagonal order to avoid excessive PCB deformation; design multi-point uniform support for complete machine installation to reduce stress transmission from operation vibration to PCB.

6. Practical Rectification Cases of Real PV Power Stations

Case 1: Rectification of MLCC Salt Spray Corrosion Failure for Inverters in Coastal PV Power Station

Project Background: A 100MW PV power station on the eastern coast had concentrated string inverter failures after 3 years of operation, with a repair rate of 15%. Disassembly found that a large number of MLCC terminals in DC bus and communication interface circuits were blackened and corroded open circuit, which was determined as salt spray sulfidation corrosion failure.

Root Cause Analysis: The original scheme adopted ordinary industrial-grade three-layer terminal MLCC with weak corrosion resistance; the coastal atmosphere has high content of chloride ions and sulfides, corrosive gases are inhaled during equipment heat dissipation, and electrode corrosion is accelerated after condensation; meanwhile, PCB substrates and sealants contain sulfur, and endogenous corrosion superimposes exogenous corrosion, reaching the failure threshold in about 3 years.

Rectification Scheme: 1. Replace all MLCC on the control board with Barron PV-specific sulfidation-resistant series, and high-voltage busbars adopt high-corrosion-resistant terminals with thickened nickel + palladium barrier, passing 240h salt spray test; 2. Replace low-sulfur PCB substrates and sulfur-free conformal coating to eliminate endogenous corrosion sources; 3. Optimize conformal coating process, adopt selective coating + overall spraying double protection to ensure complete encapsulation of capacitors; 4. Add salt spray filter cotton at the air inlet to reduce the entry of corrosive particles.

Implementation Effect: The rectified prototype passed 2000-hour accelerated salt spray test without abnormality; after 2 years of replacement and operation on site, the corrosion failure rate dropped to 0, greatly reducing operation and maintenance costs and extending the service life of the whole machine.

Case 2: Rectification of Excessive Ripple Caused by High-Temperature Aging of Inverters in Plateau PV Power Station

Project Background: For a PV power station in the northwest Gobi, the output ripple of inverters exceeded the standard in high-temperature summer, the power generation efficiency decreased, and some equipment had overvoltage protection shutdown. Testing found that the capacitance of DC bus MLCC was seriously attenuated, and the attenuation of some capacitors exceeded 40%.

Root Cause Analysis: The original scheme adopted ordinary X7R high-voltage capacitors, which had large capacitance attenuation under DC bias; the internal high temperature of the chassis reached more than 90℃ in summer, superimposed with high-voltage bias, dielectric aging was accelerated and capacitance continued to attenuate; after 2 years of operation, the actual effective capacitance was less than half of the nominal value, and the filtering and energy storage capacity was seriously insufficient, leading to excessive ripple.

Rectification Scheme: 1. All DC bus capacitors are replaced with Barron PV-specific low-bias-aging X8R series, with capacitance attenuation ≤ 8% under 80% rated voltage bias and ≤ 3% for 1000-hour high-temperature aging; 2. Optimize voltage derating design, select higher withstand voltage specifications, reduce the ratio of actual operating voltage to rated voltage from 70% to 50%, further reducing the aging rate; 3. Optimize capacitor layout, keep away from IGBT heating area, increase heat dissipation paths, and reduce operating environment temperature.

Implementation Effect: Under full-load high-temperature conditions, the ripple returns to the design range, and the overall conversion efficiency is increased by 0.8%; accelerated aging test verifies that the capacitance attenuation is less than 15% during the 25-year life cycle, meeting the design requirements; the problem of power generation loss of the power station is completely solved.

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7. Ultimate Checklist for PV Energy Storage MLCC Selection and Verification

mu sen Conclusion

The 25-year ultra-long life and harsh outdoor environment of PV energy storage equipment determine that MLCC selection cannot follow ordinary industrial-grade standards, and must be upgraded from "parameter matching" to "full-life-cycle reliability adaptation". High-voltage bias aging, salt spray corrosion, wide temperature cycling, pulse impact and vibration fatigue are the five core failure modes of MLCC in PV energy storage scenarios. Simply improving the withstand voltage level cannot completely solve the problem, and systematic design is required from multiple dimensions such as dielectric formula, terminal process, derating design, layout protection and environmental protection.

Barron MLCC has been deeply engaged in the new energy field for many years, and has built a complete MLCC product matrix dedicated to PV energy storage, covering high-voltage low-bias-attenuation X8R series, high-precision C0G series, sulfidation corrosion-resistant series, soft termination stress-resistant series and high-pulse surge-resistant series, with full specifications of packages from 0402 to 2225 and voltage from 6.3V to 3kV. The full series has passed 2000-hour extended reliability verification and can support 25-year ultra-long life design requirements. The products have been batch introduced into leading inverter, energy storage and BMS manufacturers, with reliability benchmarking against international first-tier brands and significant comprehensive cost advantages.

We are equipped with a professional technical team for the new energy industry, which can provide full-process services such as free BOM selection optimization, failure analysis, customized reliability test schemes and prototype debugging support, helping customers quickly complete high-reliability design and domestic substitution implementation, and jointly promoting the high-quality development of the PV energy storage industry.

You can send the BOM and working condition requirements of your PV energy storage equipment to obtain exclusive free MLCC selection scheme, 25-year life evaluation report and sample test support.