179 微型逆变器与优化器外壳
微逆的安装位置决定了一切
微型逆变器和功率优化器直接装在组件背面，这个位置的温度是全系统最高的：组件背面温度 70-85℃，
加上自身发热，壳体内部可达 90-100℃。同时要 IP67 防护、户外 25 年。
高温 + 密封 + 户外这三条叠加，是微逆壳体选料的全部难点。
散热与防护的根本矛盾
电子产品要散热，IP67 要密封，这两个要求天然冲突。
微逆的解法是壳体本身作为散热器——金属壳（压铸铝）是主流，塑料壳只在小功率（300-600 W）和低发热设计上用。
若用塑料壳，必须走导热改性，导热系数做到 1.5-3.0 W/(m·K)，同时靠外壳散热筋加大面积。
现场还原：屋檐下的逆变器
2025 年 4 月，山东一户用光伏项目的运维上门服务，主人指着屋檐下的微逆问了个外行但要命的问题：「这个东西夏天晒着，里头不怕热坏吗？」
运维答不上来，把问题转给了设备厂。厂里把这个问题当成了客服培训教材——因为答案恰是微逆设计的第一约束。
微逆装在组件背面或屋檐下，环境温度 40℃ 的夏天，壳体附近能到 60℃，而壳内功率器件热点更高。整机设计要在「散热」（开孔、金属壳）和「防护」（IP67 密封、十年免维护）之间找到平衡点——散热开孔大，粉尘水汽进来；
密封做死，热量出不去。
材料在这道平衡题里的角色：壳体料要同时扛住外晒（耐候）、内部高温（长期工作温度）、电气安全（阻燃加绝缘）。
我们给这家厂配的是耐候阻燃 PA66 专用牌，方案上做了两处配合：壳体和散热板分离（热走金属底板出），壳体密封面用低蠕变配方撑住 IP67 压紧力。
这家厂后来在宣传页上写了一句实在话：「微逆的寿命，一半是设计的，一半是壳内温度管理给的。」材料工程师听到这句话会点头——壳内每降 10℃，料的寿命翻倍，这不是比喻，是阿伦尼乌斯规律。
壳体材料的两种选择
阻燃 PC：尺寸稳定、抗冲击好、可做到 IP67，但耐热上限 120℃，导热差。PA66-GF20 无卤阻燃耐候：耐热 140℃、可做导热改性、强度高，但吸湿、低温脆性要注意。目前主流是阻燃 PC，PA66 用于需要导热或更高耐热的型号。
IP67 的密封设计
IP67 要求短时浸水不进，关键是三处：上下壳之间的密封圈（硅胶，
压缩 25-30%）、进出线的防水接头、透气阀（平衡内外压差）。
透气阀是微逆特有的——密封壳体内外温差会产生负压，没有透气阀会把水汽吸进去。这个细节很多新厂家会漏。
深一层：温度每降十度，寿命翻一倍
聊微逆和优化器的寿命设计，有一块化学课的知识是真正的设计基石：阿伦尼乌斯规律。讲清楚它，很多选料决策就有了标尺。
规律本身一句话：化学反应速率随温度指数上升，工程上的粗算是「工作温度每升高 10℃，材料老化寿命减半」。这个减半规律对塑料件的热氧老化基本成立，对电容类器件也基本成立。
放到微逆上算一笔账：壳内热点 95℃ 的设计，和热点 85℃ 的设计，同样材料下寿命差一倍。
而要压这 10℃，靠三条路：散热设计（热沉、导热垫、布局）、降额设计（功率器件留余量）、还有壳体材料的配合——壳体密封压紧力十年不松、密封圈不提前老化、内部支架不蠕变位移，这些全是材料活。
反过来看失效案例：微逆返修的最大宗原因不是功率器件烧毁，是密封失效进水加接插件接触电阻漂移——这两条的背后，一条是壳体密封面蠕变，一条是端子座高温松弛。全都是「温度驱动、材料承担」的失效。
所以微逆选材料，第一问不是阻燃多少、强度多少，是「你按多少度热点、多少年寿命算的」——这个数没定，其他指标都没有锚。
耐候和阻燃要同时过关
微逆壳体要 UL94 V-0，同时户外 25 年。如前所述，溴系阻燃在紫外下会分解，必须无卤阻燃 + 耐候三件套。
这个组合的配方难度大、成本高，但别无选择。验证标准是 3000 h 氙灯老化后强度和阻燃等级双保持。
寿命设计的核心：控制温度
微逆的标称寿命 25 年，但电子元件寿命受温度支配——电解电容温度每升 10℃ 寿命减半。
所以微逆的材料和结构设计，第一目标是降低内部温度而不是降低成本。
能把它装在组件背面通风位置、加遮阳、用导热壳体的方案，比换更耐热的塑料更有效。
工程实测：4 条强制测试
测试1：壳体温度。组件背面 80℃ 时，塑料壳内温度 95℃，金属壳内 82℃——金属散热优势明显。
测试2：导热系数。导热 PA 1.5-3.0 W/(m·K)，普通 PA 0.25——塑料壳必须导热改性。
测试3：氙灯 3000 h。无卤阻燃 PC 加耐候强度保持 85%，溴系阻燃 PC 降至 58%。
测试4：IP67 浸水。加透气阀的壳体浸水试验后内部无凝露，无透气阀的有凝露。
追问三连：采购最常问的三件事
一问：壳体塑料还是压铸铝。 压铸铝散热好但贵、重、要喷涂绝缘；塑料壳轻、便宜、免喷涂，但散热依赖结构设计（导热垫加金属底板）。中小功率微逆走塑料壳加铝底板是主流，全塑方案功率上不去。判断线按瓦数走：400 W 以下塑料壳方案成熟，再往上热设计压力剧增。
二问：IP67 的密封怎么保十年。 密封系统三件套：密封圈材料（压缩永久变形数据）、密封面刚性（壳体料蠕变小）、装配压紧力（螺栓分布加限位）。三者是乘法关系，任何一项归零整机归零。湿热老化后的密封压紧力数据，要比干态数据重要十倍。
三问：耐候和阻燃会不会打架。 会有点：某些阻燃体系不耐紫外，户外几年阻燃件表面粉化、阻燃层析出。解法是配方层面调和（无卤体系加耐候三件套），选型层面验证（阻燃加氙灯双报告）。打架不打架，看的是配方功力，市面上成熟的复合牌值得多问几家。### 算一笔材料账：微逆的十年折现
微逆按十年以上免维护设计，材料账要用折现的思维算。
一台微逆的壳体材料，专用牌比通用牌贵 6 元。这 6 元对应的差异：密封面十年不蠕变、壳体十年不粉化、内部支架十年不松弛——三者都直接关联「第几年开始批量返修」这条曲线。
按分布式光伏的运维口径：屋顶作业的单次上门成本 200 元起，一台微逆返修的完整成本（上门、拆装、设备、新件）超过机器本身价值。返修率每高一个百分点，十年累计的运维成本每台多 20 元以上——是那 6 元差价的三倍多。
再把品牌侧算进去：微逆销售话术里「25 年质保」的底气，一半在电路设计，一半在壳内温度和密封管理。返修率失控的品牌，质保承诺会直接变成财务黑洞。
微逆行业的集中度这几年快速提升，头部品牌的共同点之一是材料验证体系完整——这个行业的洗牌逻辑里，材料是慢变量，但慢变量决定终局。6 元的差价，是慢变量里最便宜的一个。### 边界声明
| 工况 | 推荐材料 |
|---|
| 小功率微逆 | 阻燃 PC 或导热 PA66 |
| 大功率微逆 | 压铸铝壳 |
| 需要散热的塑料壳 | 导热 PA66-GF20 |
| 密封 | 硅胶圈 + 透气阀 |
| 户外长期 | 无卤阻燃 + 耐候三件套 |
工程备忘
微逆壳体量产前必须做导热 + 氙灯 3000 h + IP67 三项。第一目标是降内部温度，不是降成本。
实战案例：常见踩坑与正解
踩坑一：用常规 PA66 做户外微逆外壳，没加耐候体系，两年就粉化开裂。正解：光伏储能件的设计寿命是 25 年，必须走专用耐候牌号——UV 吸收剂 + HALS + 抗氧剂三件套缺一不可，并且要 3000 h 氙灯老化验证。踩坑二：只看常温强度不看湿热老化后的强度。微逆外壳装在户外，湿热老化 1000 h 后强度保持率低于 70% 的料不能用。正解：拿湿热老化后的数据选料，不拿常温数据选料。踩坑三：为了过认证临时换料，换完没重新做老化验证，批量装机后集中失效。正解：换料号必须重跑全套老化，这是光伏行业的基本规矩。
反向案例：密封面蠕变的一毫米
2024 年，华东某品牌微逆集中出现进水返修，返修率从千分之二窜到百分之二。拆机分析：进水位置集中在壳体上盖密封面，密封圈完好，但密封面本身塌了一道浅沟。
根因链：那批壳体换了便宜的阻燃 PA66（降本项目），长期工作温度下密封面区域蠕变，压紧应力逐渐释放，三年后密封线出现微渗——夏天壳内热、冬天冷缩，微渗反复开合，雨水汽沉积进去。
事故时间线：降本换料在 2021 年，批量装机 2022 年，2024 年雨季集中报修。中间隔了两年多——蠕变失效就是这样，账期比所有人的耐心都长。
处理：热区壳体料升级回低蠕变牌，密封面加金属嵌件圈，已装机批次按批次号召回更换。召回的钱够当年降本省下的一百倍。
这家厂后来在项目评审里加了一条流程：任何接触密封面的材料变更，必须带蠕变数据评审，工程一票否决。降本不是不能动材料，是不能动「承担密封和压紧」的部位——这条线划清楚，降本和安全就都有了各自的领地。
延伸判断：两个容易混淆的概念
微逆外壳的选料讨论里，有两个概念常年被混淆。第一个是阻燃和绝缘。
阻燃解决的是不起火，绝缘和耐电痕化解决的是不爬电不击穿，这是两件事。
一个料可以阻燃 V-0 但 CTI 只有 250 V，装在带电件上照样出事。
第二个是强度和韧性。玻纤增强提高强度但降低韧性，增韧提高韧性但降低强度和刚性。
同一个件上，结构部位要强度，卡扣部位要韧性，一般要分成两种料，图省事用一种料的结果，不是卡扣断就是本体裂。
把这三件事写成一张表发给供应商，比打十通电话有用——微逆外壳的选型沟通成本，基本都花在这几项反复确认上。
补记：三个现场判断信号
信号一：壳体密封面出现压痕沟。 蠕变进行时，压紧力在衰减，渗漏是时间问题，整批按批次号排查，别等报修。
信号二：壳体表面粉化。 耐候缺失，同时预警内部料的老化进度——外表面都粉化了，壳内温度更高的部位可想而知。
信号三：接插件接触电阻上涨。 端子座高温松弛，查料的 RTI 和端子压接结构，这一项涨上去，整机效率跟着掉，返修单就在路上。### 验证顺序：三步走完再下单
第一步，定热点：按整机热设计定壳内热点温度，材料耐温档按热点配，不按环温配。
第二步，验密封：密封面蠕变数据加湿热老化后压紧力复测，微逆进水的账都在这一步预防。
第三步，验耐候：外晒面按 3000 小时氙灯验收，屋顶的紫外比人想象的狠。三步走完，微逆的十年设计寿命才有材料的支点。
结语
把料倒进机器之前——选料这件事，越早问越省事。
这类件的选料与试模，可以一起聊。
179 Microinverter and optimizer casing
Microinverter installation position determines everything
Microinverter and power optimizer are installed directly on the back of the module, where the temperature is highest in the system: the back temperature of the module is 70-85°C,
with its own heating, the inside of the enclosure can reach 90-100°C. At the same time, IP67 protection and outdoor durability are required for 25 years.
High temperature + sealing + outdoor — these three factors overlap — the main challenge in selecting micro-inverter housings.
The fundamental contradiction between heat dissipation and protection
Electronic products need heat dissipation and IP67 sealing; these two requirements naturally conflict.
WeiNi's solution is that the shell itself serves as a heat sink—metal shells (die-cast aluminum) are mainstream, while plastic cases are only used for low power (300-600 W) and low heat generation designs.
If using a plastic shell, thermal conductivity modification must be used, with a thermal conductivity coefficient of 1.5-3.0 W/(m·K), and the shell heat sink should be used to enlarge the area.
On-site reconstruction: Inverter under the eaves
In April 2025, a household in Shandong provided on-site maintenance for a photovoltaic project. The owner pointed at the micro-inverter under the eaves and asked an amateurish but harsh question: "Isn't this thing afraid of getting hot inside when exposed to the sun in summer?"
Operations couldn't answer, so they passed the issue to the equipment manufacturer. The factory treated this question as a customer service training material—because the answer is precisely the first constraint in microinverter design.
Microinverter is installed on the back of the module or under the eaves; in summer, when the ambient temperature is 40°C, the temperature near the casing can reach 60°C, and the hotspot for power devices inside the case is even higher. The whole system design must find a balance between "cooling" (perforations, metal casing) and "protection" (IP67 sealed, ten-year maintenance-free) — large ventilation openings allow dust and moisture to enter;
sealing is rigid, so heat can't escape.
The role of materials in this balancing matter: the shell material must withstand external sun (weather resistance), internal high temperatures (long-term operating temperature), and electrical safety (flame retardant plus insulation).
We gave this factory a weather-resistant and flame-retardant PA66 special brand, with two coordinated aspects in the plan: separation of the shell and heat sink (heat dissipation from the metal base plate), and the sealing surface of the shell using a low-creep formula to maintain IP67 compression force.
This factory later wrote a candid statement on their promotional page: "The lifespan of micro-retrograde is half due to design, and half is due to internal temperature management." Materials engineers nod when they hear this—for every 10°C drop inside the shell, the lifespan of the material doubles. This is not a metaphor, but an Arrhenius law.
Two choices of housing materials
Flame-retardant PC: dimensional stability, good impact resistance, can reach IP67, but heat resistance limit is 120°C, poor thermal conductivity. PA66-GF20 halogen-free flame retardant and weather-resistant: heat-resistant up to 140°C, can be modified thermally conductivity, high strength, but moisture absorption and low-temperature brittleness need attention. Currently, the mainstream is flame-retardant PC, and PA66 is used for models requiring heat conductivity or higher heat resistance.
IP67 sealing design
IP67 requires water not to enter during short immersion periods. The key points are three: the sealing ring between the upper and lower shells (silicone,
compression 25-30%), the waterproof connector for the inlet and outlet lines, and the vent valve (to balance the pressure difference between the inside and outside).
The vent valve is unique to microinverters—the temperature difference inside and outside the sealed enclosure creates negative pressure, and without a vent valve, water vapor can be drawn in. Many new manufacturers leak this detail.
Deeper layer: Every ten-degree drop in temperature doubles the lifespan of
Talking about microinverters and optimizer lifespan design. There is a piece of chemistry knowledge that is the true cornerstone of design: Arrhenius's law. By explaining it clearly, many material selection decisions have a benchmark.
The law itself In short: the chemical reaction rate increases with the temperature index. In engineering, the rough calculation is "for every 10°C increase in operating temperature, the material's aging life is halved." This halving law basically applies to thermal and oxygen aging of plastic parts and also to capacitive devices.
Put it on microinverter to calculate: designing a hot spot of 95°C inside the case and an 85°C hot spot for the same material have twice the lifespan difference.
To pressure this 10°C, there are three paths: heat dissipation design (heat sink, thermal pads, layout), derating design (leaving margin for power devices), and the coordination of housing materials—the case seal tightens for ten years, the sealing ring does not age prematurely, and the internal bracket does not creep or shift. All of these are material issues.
Looking at failure cases in reverse mode: The biggest cause of micro-reverse rework is not power device burnout, but seal failure and ingress combined with contact resistance drift in connectors—behind these two factors are creep of the shell sealing surface and high-temperature looseness of the terminal block. All are failures caused by "temperature-driven, material-borne" failure.
So for micro-reverse material selection, the first question isn't how much flame retardant or what strength is, but 'you calculate based on the heating point and the lifespan of a certain number of years'—this number isn't fixed, and other indicators have no anchor.
Weathering resistance and flame retardancy must pass both
Micro retrograde housing must meet UL94 V-0, and be outdoor for 25 years. As mentioned earlier, bromin-based flame retardants decompose under ultraviolet light, so it must be a halogen-free flame retardant + weather-resistant three-piece set.
This combination formula is difficult and costly, but there's no other choice. The verification standard is to maintain both strength and flame retardant rating after 3000 hours of xenon lamp aging.
Core of lifespan design: controlling temperature
Weiiner's nominal lifespan is 25 years, but the lifespan of electronic components is determined by temperature—electrolytic capacitors halve their lifespan at every 10°L temperature.
Therefore, the primary goal of Weiiner's material and structural design is to lower internal temperature, not cost.
Installing it in ventilated areas on the back of the module, adding shading, and using a thermal housing is more effective than replacing heat-resistant plastics.
Engineering Testing: 4 mandatory tests
Test 1: Housing temperature. At 80°C on the back of the module, the temperature inside the plastic shell is 95°C, inside the metal shell is 82°C—metal's heat dissipation advantage is obvious.
Test 2: Thermal conductivity. Thermal conductivity PA 1.5-3.0 W/(m·K), ordinary PA 0.25—plastic shells must be thermally modified.
Test 3: Xenon lamp 3000 hours. Halogen-free flame-retardant PC maintains weather resistance at 85%, brominated flame-retardant PC reduces to 58%.
Test 4: IP67 immersion. After water immersion test on the shell with an air penetration valve, there is no condensation inside; without a vent valve, condensation does.
Follow-up question three times: The three most frequently asked questions in purchasing
First question: Is the shell plastic or die-cast aluminum? Die-cast aluminum has good heat dissipation but is expensive and heavy, requiring spray insulation; Plastic shells are lightweight, inexpensive, and require no coating, but heat dissipation depends on structural design (thermal pads plus metal base plates). Small to medium power slightly reverse flow plastic shells with aluminum base plates are mainstream; all-plastic solutions cannot increase power output. Judgment lines by wattage: plastic case solutions below 400 W are mature; further upheating, design pressure increases significantly.
Question 2: How to maintain an IP67 seal for ten years? The three sealing system components are: sealing ring material (compression permanent deformation data), sealing surface rigidity (small creep of shell material), assembly compression force (bolt distribution plus limit). These three are multiplicative relationships; any one must reset the entire machine to zero. The sealing compression force data after damp heat aging is ten times more important than dry state data.
Question 3: Will weather resistance and flame retardant compete? There are some points: some flame-retardant systems are not UV-resistant, so after several years outdoors, flame-retardant parts have surface chalking and flame-retardant layering. The solution is formulation-level blending (halogen-free system plus weather-resistant three-piece set), and selection verification (flame-retardant plus xenon lamp dual report). Whether it's a fight or not depends on the formula's skill; mature compound brands on the market are worth asking about several more times. ### Doing a Material Account: WeiNi's Ten-Year Discounted Value
WeiNi is designed for maintenance-free over ten years, so the material ledger should be calculated with discounted thinking
The shell material of a microinverter is 6 yuan more expensive than a general-purpose brand. This 6 yuan corresponds to differences like: sealing surfaces remain uncreeped for ten years, shells do not crumble for ten years, internal supports remain unloosened for ten years—all three directly relate to the "year in which year mass rework begins" curve.
Based on distributed photovoltaic operation and maintenance standards: the cost of a single on-site roof visit starts at 200 yuan, and the total cost of a microinverter rework (on-site visit, disassembly, equipment, new parts) exceeds the machine's intrinsic value. For every percentage point increase in the rework rate, the cumulative operation and maintenance cost per unit over ten years is more than 20 yuan—more than three times the 6 yuan price difference.
Further factoring in the brand side: the confidence of the "25-year warranty" in Weiin's sales pitch is half in circuit design, half in internal temperature and sealing management. For brands with uncontrolled repair rates, warranty commitments become financial black holes.
Weiin's industry concentration has rapidly increased in recent years. One common feature of leading brands is a complete material verification system—in this industry's reshuffling logic, materials are slow variables, but slow variables determine the endgame. A 6 yuan price difference is the cheapest among slow variables. ### Boundary Statement
| Operating Condition | Recommended Materials |
|---|
| Low Power Microinverter | Flame Retardant PC or Thermal Conductive PA66 |
| High Power Microinverter | Die-Casted Aluminum Shell |
| Plastic Case Requiring Heat Dissipation | Thermal Conductive PA66-GF20 |
| Sealing | Silicone ring + vent valve |
| Outdoor long-term | halogen-free flame retardant + weather-resistant three-piece set |
Engineering memo
Microinverter housing must be tested for thermal conductivity + xenon lamp 3000 h + IP67 before mass production. The first goal is to lower the internal temperature, not to reduce costs.
Practical Case: Common pitfalls and correct solutions
Pitfall 1: Using conventional PA66 to make outdoor micro-inverter housings without a weather-resistant system, they pulverized and cracked within two years. Correct answer: The design lifespan of photovoltaic energy storage components is 25 years, so they must use a dedicated weather resistance grade—UV absorber + HALS + antioxidant—a three-piece set that is indispensable, and requires 3000 hours of xenon lamp aging for verification. Pitfall 2: Only focus on strength at room temperature, not on strength after damp heat aging. When installing micro-inverter casings outdoors, materials with a strength retention rate below 70% after 1000 hours of damp heat aging cannot be used. Correct answer: Select materials based on data after damp heat aging, not at room temperature. Pitfall 3: Temporary material replacement to pass certification, but no re-aging verification after replacement, resulting in mass failures after assembly. Correct answer: The replacement number must rerun the entire aging process; this is a basic rule in the photovoltaic industry.
Reverse Case: One millimeter of sealing surface creep
In 2024, a certain brand in East China experienced water ingress repairs, with the repair rate jumping from 0.2% to 2%. Disassembly analysis: Water ingress was concentrated on the sealing surface of the top cover of the housing. The sealing ring was intact, but the sealing surface itself had a shallow groove.
Genyin Chain: That batch of shells was replaced with cheap flame-retardant PA66 (cost reduction project). Under long-term operating temperatures, the sealing surface area creeped, and compressive stress gradually released. Three years later, the sealing line showed micro-seepage—heat inside the shell in summer, cold shrinkage in winter, micro-permeability repeatedly opened and closed, rainwater vapor deposited inside.
Accident Timeline: Cost reduction and material change in 2021, mass installation in 2022, and concentrated repair requests during the 2024 rainy season. There was a gap of more than two years—creep failure is just like that, and the payment period is longer than everyone's.
Handling: The hot zone shell material was upgraded back to a low creep brand, with metal insert rings added to the sealing surface. Installed batches were recalled for replacement according to batch number. The recall money was a hundred times the cost savings from that year.
This factory later added a process to the project review: any material change that contacts the sealing surface must be reviewed with creep data, and the project vetoed it with a single vote. Cost reduction doesn't mean the material can't be changed, but the parts that "handle sealing and compression" must not be touched—this line is clearly drawn, and cost reduction and safety each have their own domains.
Extended Judgment: Two easily confused concepts
Weiin's housing material selection discussions, two concepts have long been confused. The first is flame retardancy and insulation.
Flame retardant solves the problem of no fire, while insulation and anti-electric mark protection solve the problem of no electric climbing or breakdown. These are two different things.
One material can be flame-retardant V-0, but CTI is only 250V, so installing it on live parts can still cause problems.
The second is strength and toughness. Glass fiber reinforcement increases strength but reduces toughness; toughening improves toughness but reduces strength and rigidity.
For the same part, structural parts need strength, buckle areas require toughness. Generally, two types of materials are used. Using one material for convenience results in either snap snaps or the body cracks.
Writing these three things into a sheet and sending it to suppliers is more useful than making ten phone calls—the cost of disc inverter housing selection and communication is basically spent on repeated confirmations of these few items.
Supplement: Three on-site judgment signals
Signal One: Indentation grooves appear on the shell sealing surface. During creep, the compression force is decaying; leakage is a matter of time. Inspect the entire batch by batch number, don't wait for repairs.
Signal Two: Shell surface chalking. Loss of weather resistance and an early warning of internal material aging progress—the outer surface has all chalked, so the inner shell temperature is obviously higher.
Signal Three: Contact resistance of connectors is rising. Terminal block is loose at high temperature, inspecting the material RTI and terminal crimping structure. If this item rises, overall machine efficiency drops, and the repair order is on the way. ### Verification sequence: After completing three steps, place an order
Step one, set the hot spot: set the internal hot spot temperature according to the machine's thermal design, match the material resistance temperature according to the hot spot, not the ambient temperature.
Step two, seal inspection: moisturize the creep data of the sealing surface, retest the compression force after thermal aging, and prevent water ingress at this step.
Step three, weather resistance test: the exterior surface is inspected with a xenon lamp for 3000 hours; the roof's ultraviolet radiation is stronger than people imagine. After completing these three steps, the ten-year design lifespan of the micro-inverter will have a fulcrum for the materials.
Conclusion
Before pouring materials into the machine—the earlier you ask about material selection, the easier it is.
For material selection and mold trials for these types of pieces, you can chat together
