Weather-Resistant Gel Potting for Photovoltaic Inverters and Power Optimizers

INTRODUCTION

String inverters, microinverters and power optimizers sit under solar modules or on outdoor walls for 25-year design lives, facing daily thermal cycles from minus 40 nights to 80C enclosure peaks, condensation, rain and dust. Power boards carry high-voltage DC terminals, inductors and SMT controllers where moisture-driven corrosion and solder fatigue drive field failures. Hard potting gives weather protection but its modulus stresses large components through thousands of cycles and makes warranty repair impossible. Hong Ye HY-9405 jelly gel provides the compromise: the 1:1 addition-cure gel (penetration 170 plus or minus 30) seals terminal blocks and board assemblies against condensation, absorbs thermal-expansion mismatch between aluminum heat-sink housings and PCBs, insulates above 20 kV/mm for DC spacing, and remains peelable for component-level repair during warranty service. Flame-retardant UL94 V-0 grade meets PV safety requirements. A typical string inverter uses 1-3kg of gel.

PRODUCT REQUIREMENTS

PV inverter potting requires: condensation sealing for high-voltage DC terminals; absorption of thousands of daily thermal cycles; dielectric strength above 20 kV/mm; UL94 V-0 flame rating; peelable warranty repair; resistance to humidity and UV; and production-line cure compatibility.

CORRESPONDING PRODUCT MODEL PARAMETERS

Recommended model: HY-9405 - Blue medium-tack grade for electronic potting, meter sealing, waterproofing and vibration damping

GRADE SELECTION GUIDE

FREQUENTLY ASKED QUESTIONS

Q: Will gel interfere with inverter heat dissipation?

A: No. Gel is applied to terminal and control zones while power devices stay mounted to heat sinks; thin-section soft gel adds negligible thermal resistance.

Q: Can potted inverters be repaired under warranty?

A: Yes. The gel peels from the fault area and bonds to fresh gel after repair, so units return to service instead of being scrapped.

Q: Does the gel meet solar fire safety?

A: The UL94 V-0 flame-retardant grade is specified for PV applications, with RoHS/REACH and batch COA documentation.

QUALITY ASSURANCE & CERTIFICATION

Every batch of Hong Ye HY-94 series jelly gel is produced under ISO 9001 certified quality management in a dedicated silicone workshop, with incoming raw-material inspection, in-process mixing control and finished-product testing on every batch. Before release each lot is checked for viscosity, mix ratio, cure time, penetration, color and tack, and a Certificate of Analysis (COA) listing the actual measured values ships with every order. Standard grades carry RoHS 2.0 and REACH SVHC test reports; skin-contact and baby-care grades can be supplied with FDA 21 CFR 177.2600 and LFGB Section 30/31 reports and, on request, ISO 10993 biocompatibility testing; flame-retardant grades meet UL94 V-0. Food-contact, medical and export orders are supported by the corresponding compliance files for customer qualification. Hong Ye has manufactured and supplied jelly gel to contractors, filter builders and equipment makers in over 60 countries since 2005, with monthly capacity above 500 tons, batch traceability and multi-language documentation. Application engineers provide grade selection, sample evaluation, on-site or video pouring guidance and after-sales follow-up, and technical data sheets (TDS), safety data sheets (SDS) and test reports are available before order to support tender and audit processes.

CONCLUSION

The market for tank sealant jelly gel in this application area continues to expand as cleanroom construction, electronic encapsulation, automotive electrification, energy storage and consumer product manufacturing drive demand for reliable two-component addition-cure silicones. Hong Ye supports this growth with ISO 9001 certified production, 500-plus ton monthly capacity, complete compliance documentation and responsive application engineering. Buyers evaluating suppliers are advised to look beyond unit price and compare batch-to-batch consistency, documentation completeness, delivery stability and technical service responsiveness, because the cost of a sealing or potting failure - rework, downtime, certification delay or product recall - far exceeds the incremental cost of a quality gel. Choosing the correct grade for the channel, operating temperature and service environment, following the 1:1 mixing and pouring procedure and validating with a small trial batch all help secure a durable seal. Hong Ye welcomes sample requests and application enquiries; our engineers will recommend the HY-9400, HY-9405 or HY-9409 grade that matches the sealing or potting requirement and support qualification from first sample through volume production.