Industry Platform
Photovoltaic cable assemblies engineered for panel arrays, inverters and battery storage — UL 4703 PV wire, 1500V DC rated, MC4-terminated and built for 25+ years of outdoor service.
Application Context
A solar wire harness is not ordinary cable cut to length. A photovoltaic array spends 25+ years outdoors under UV, heat, cold, moisture and thermal cycling, while carrying DC at system voltages up to 1500V. General-purpose hook-up wire degrades, cracks and fails in that environment — so PV harnesses use solar-grade materials, validated connectors and tested terminations from the start.
Across a system the wiring changes job at every stage: module jumpers and string leads on the array, combiner-box harnesses gathering strings, power cable into the inverter and power-conditioning equipment, high-current interconnects for battery energy storage, and shielded comms back to monitoring and tracker controls. We build all of these as custom, pre-terminated assemblies — so your installers bolt them on instead of field-crimping MC4 connectors on a rooftop or in a field. For the deeper engineering detail, see our solar energy wire harness guide.
Applications
UV-resistant cable assemblies for every stage of a PV + storage system.
Module-to-module jumpers, string leads and combiner-box harnesses for residential, commercial and utility-scale arrays. Built with double-insulated UL 4703 PV wire and pre-terminated MC4 / MC4-EVO2 connectors so installers drop them straight onto the racking.
High-ampacity battery interconnects, rack busbar cables and BMS sense harnesses for grid-tied and off-grid storage. Flexible fine-stranded copper handles repeated handling and vibration without conductor fatigue.
AC/DC power cables and control harnesses for string inverters, microinverters, optimizers and power-conditioning units. Low-loss conductors and optional foil+braid shielding keep MPPT and comms signals clean next to switching power stages.
Communication and sensor cables for monitoring platforms, single-axis trackers, irradiance sensors and SCADA/data-acquisition equipment — shielded twisted pairs that run long distances across an array without picking up noise.
Engineering Challenges
Material and jacket validation for 25+ years of direct UV, ozone and moisture exposure and -40°C to +90°C thermal cycling across the array.
Insulation thickness, conductor spacing and connector selection validated for modern 1500V DC string architectures, not just legacy 600/1000V systems.
Factory-terminated MC4 / MC4-EVO2 / Amphenol H4 selection with IP67/IP68 sealing and verified contact resistance so installers never field-crimp on the racking.
Continuity, Hi-Pot dielectric-withstand and MC4 contact-resistance checks planned to the right quality level before shipment.
Technical Capabilities
UL 4703 / IEC 62930 construction with UV-resistant materials, validated for long-term outdoor and 1500V DC service.
Manufacturing Process
Quality & Testing
Every solar harness gets continuity and Hi-Pot (dielectric withstand) testing, with MC4 contact-resistance checks, all documented for lot-level traceability before it ships.
Why WHP
PV cable assemblies that pass inspection and last as long as the modules.
UV-resistant XLPE insulation and tinned copper conductors engineered for 25+ years of outdoor exposure — not repurposed general-purpose wire.
PV wire and assemblies built to the international photovoltaic standards (UL 4703, UL 9703 for PV wiring systems, IEC 62930 / EN 50618) that AHJs and EPCs require.
Dielectric, spacing and insulation choices validated for modern 1500V DC string architectures, not just legacy 600/1000V systems.
Every harness gets continuity and Hi-Pot (dielectric withstand) testing, with MC4 contact-resistance checks, before it ships.
Our PV cable assemblies are built to the international photovoltaic standards inspectors, EPCs and AHJs require.
FAQ
OEM Program Entry
Share drawings, BOM, connector specs, or early-stage requirements. Our engineering team will review manufacturability, connector selection, conductor sizing for voltage drop, testing needs, and production requirements before manufacturing starts.
Related Capabilities
Custom cable assembly and harness services that pair with solar programs.
Case Studies
Real, anonymized programs we delivered in this industry — the actual challenge, solution, and numbers.
Engineering an inner- and outer-jacket material combination with the raw cable maker delivered a TC-ER compliant spec that hit the diameter and flexibility targets.
Read case study
Swapping hard tooling for silicone molds produced five functional overmolded samples in three to four weeks with no upfront tooling investment.
Read case study