Solar · UL 4703 · 1500 V DC · MC4 · IP68 Outdoor
PV STRINGS & ESS HARNESSES
RATED TO 1500 VOLTS DC.
PV string cables with UL 4703 PV wire and MC4 connectorization. ESS (Energy Storage System) battery harnesses up to 1500 V DC. Inverter AC and DC-side cables, UV-resistant outdoor jackets, IP68 sealed connectors for 25-year array deployment lifespans.
UL 4703
PV Wire Compliant
1500V
DC System Voltage
MC4
Connector Default
25 yr
Field Lifespan Target
UL 4703
PV Wire Spec Compliant
TÜV 2 PfG 1169
EU Solar Cable
1500 V DC
System Voltage Rating
IP68
Outdoor Sealed Default
What We Build for Solar & ESS OEMs
FROM ROOFTOP STRING
TO UTILITY-SCALE ESS.
XUDONG Cavite serves residential / commercial / utility-scale solar installers, energy-storage system integrators and inverter OEMs across the United States, Australia, Japan, Korea and Europe. Active programs include rooftop PV string cables, utility-scale array harnesses, ESS battery interconnects (LiFePO4 and NMC chemistries) up to 1500 V DC, hybrid inverter AC and DC-side cables and microgrid distribution harnesses.
Our solar cable library is anchored in UL 4703 PV wire (US market) and TÜV 2 PfG 1169 (EU / TÜV Rheinland spec). We carry multi-strand tinned-copper conductors 10 AWG to 4/0 AWG with cross-linked polyolefin (XLPO) jackets that are UV-stabilized for 25-year field deployment. MC4 connectors are sourced from Stäubli (the original-equipment manufacturer) — Multi-Contact / MC4 compatible OEM clones available at lower price point on contractor-grade programs.
ESS battery harnesses route through our high-voltage harness line for 1500 V DC system topology. Outdoor sealing routes through waterproof harness cells with IP68 air-decay validation. Customer programs use our custom wire harness workflow for non-standard topologies.
Solar Capability Matrix
SIX ENERGY-GRADE
SPECIALIZATIONS.
Built to UL 4703 and TÜV 2 PfG 1169 — for 25-year field lifespans.
PV String Cables · UL 4703
10 AWG to 6 AWG tinned-copper PV wire. UL 4703 listed jackets, UV-stabilized XLPO compound, -40 to +90 °C ambient.
1500 V DC ESS Battery Harness
Battery-pack interconnects for LiFePO4 / NMC ESS. 35 mm² to 240 mm² conductor range. BMS comm-bus separated and shielded.
Inverter AC + DC Cables
Hybrid inverter cables (AC grid-side and DC battery / PV side). Anderson SBE / Powerlock connectors for fast-disconnect topologies.
MC4 Connectorization
Stäubli MC4 (original) and MC4-compatible OEM clones. Crimp + torque seating to TÜV 2 PfG 1169 / IEC 62852 spec.
IP68 Outdoor Sealing
Air-pressure decay validation per IEC 60529. UV-resistant TPU strain-relief overmold. Salt-fog 96 h compliant.
Microgrid Distribution
Off-grid / hybrid microgrid AC / DC distribution harnesses. Combiner-box wiring with surge-protector device pre-termination.
Buyer Pain Points
FOUR THINGS THAT KILL
25-YEAR PV WARRANTIES.
Challenge #1
Jacket UV-degradation in 5 years instead of 25
Cheap PV wire sources use a non-cross-linked PE jacket that the spec sheet calls UV-resistant. After 4–5 years of equatorial sun, the jacket cracks at the MC4 strain relief, water ingress kills the string, you absorb the warranty cost on a 25-year promise.
How XUDONG addresses it
We carry only UL 4703-listed PV wire with cross-linked polyolefin (XLPO) jackets stabilized for 25-year lifespan. Material certs traceable to compound supplier. Salt-fog 96 hour test on each new wire lot before SOP. Jacket compound locked across program lifetime.
Challenge #2
MC4 connector counterfeits causing arc-fault
A Multi-Contact MC4 lookalike from an unauthorized source enters your BOM. Crimp profile is off by 0.2 mm, contact resistance climbs over 18 months, arc-fault detector trips and the string goes offline — sometimes with fire damage.
How XUDONG addresses it
We source MC4 connectors only from Stäubli (the OEM) for grid-tied and utility programs. MC4-compatible clones from authorized distributors like AMPHENOL HELIOS H4, used only for residential / contractor-grade work where customer accepts the alternate. Crimp profile verified against IEC 62852 every shift.
Challenge #3
1500 V DC ESS arc flash without proper de-rating
ESS battery interconnects sized to spec on paper, but the bundling factor in the cabinet pushes ambient temp above conductor de-rating curve. IR drop climbs, BMS faults trigger early, and the cabinet itself becomes a safety review item.
How XUDONG addresses it
We size ESS battery harnesses with thermal model accounting for cabinet ambient (50 °C), bundle de-rating (NEC 310.15 or IEC 60364-5-52), and conductor IR drop budget (<2% at peak current). Per-program thermal validation report supplied. BMS comm-bus runs in separate shielded sleeve.
Challenge #4
IP68 fails after 18 months in coastal install
Salt aerosol attacks unsealed cable glands, water ingress reaches MC4 backshell, leakage current sets off ground-fault detector. Maintenance crew opens 200 modules to find the failure point. Total install reliability drops below contractual SLA.
How XUDONG addresses it
Coastal-deployed harnesses use stainless-steel cable glands and IP68-rated TPU overmold. Salt-fog 96 hour test on samples before SOP. Air-pressure decay test per IEC 60529 on every production lot of outdoor harnesses. Field-failure rate below 50 PPM at 3 years on coastal installs.
Production Timeline
FROM RFQ TO
FIELD-READY LOT.
RFQ + Topology DFM
Engineering reviews PV array / ESS battery topology, system voltage, ambient deployment.
Wire + Connector Spec
UL 4703 / TÜV 2 PfG 1169 wire selected; MC4 / Anderson SBE connector locked.
Sample + Salt-Fog
First-article sample 5–7 days. Salt-fog 96 h on outdoor variants before customer review.
MC4 Crimp + Overmold
Torque-controlled MC4 crimp per IEC 62852. TPU overmold UV-rated.
100% Continuity + IP68
Cirris continuity + dielectric. Air-pressure decay test on outdoor harnesses per IEC 60529.
Field-Pack + Ship
Coiled with weather-protective wrap. UL 4703 listing mark printed on every cable.
Anonymized Case Study
AUSTRALIAN UTILITY-SCALE
ESS INTEGRATOR.
Customer: ASX-listed Australian utility-scale energy-storage integrator. They were deploying 200 MWh of LiFePO4 battery cabinets at 1500 V DC across a Queensland solar farm. They needed an Asian dual-source for the battery interconnect harness after their incumbent supplier had two production lots fail air-pressure decay testing on the IP68 cable glands.
We took over Q4 2023. Specified Stäubli MC4 (battery side) and Amphenol PowerLock (cabinet bus). 70 mm² tinned-copper conductors with XLPO jacket. Stainless-steel cable glands for the coastal Queensland ambient. Through 2024, shipped 32,000 battery harnesses with zero IP68 field returns and 26% cost reduction year-on-year.
32,000
Harnesses Shipped 2024
0
IP68 Field Returns
26%
YoY Cost Reduction
200 MWh
ESS Capacity Deployed
Solution Stack Applied
UL 4703 + TÜV 2 PfG 1169 wire
Dual-listing on conductor for US + EU regulatory cover.
Stäubli MC4 (battery side)
Original-equipment connectors; no clone risk on a 25-year deployment.
Amphenol PowerLock (cabinet bus)
Quick-disconnect for service, IP67 sealed in mated condition.
Stainless cable glands
316L stainless for coastal Queensland salt aerosol; no rust signature.
Salt-fog 96 hour validation
Per IEC 60068-2-11; report shared with customer per lot.
IEC 60529 IP68 air-pressure decay
Every production lot tested; failure rate below 50 PPM at 3 years.
Founder Note · Mr. Fei Bo Hu
“Solar buyers learn the hard way that a 25-year warranty is paid not in the first year but in the twenty-fifth. Most jacket compounds will pass UL 4703 on day one and crack at year five under equatorial sun. We refuse to substitute compound suppliers across a program lifetime — once a jacket is locked in week one, it stays locked at week 1,300. That is the only way to keep a 25-year promise credible.”
— Mr. Fei Bo Hu, President · Xudong Group
Solar Buyer FAQ
SIX QUESTIONS ENERGY
ENGINEERS ALWAYS ASK.
Q.01Are you UL Recognized for PV wire output?
+
Are you UL Recognized for PV wire output?
Q.02What MC4 connector grades do you offer?
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What MC4 connector grades do you offer?
Q.03Can you build harnesses for 1500 V DC ESS systems?
+
Can you build harnesses for 1500 V DC ESS systems?
Q.04What is your salt-fog test protocol for coastal deployments?
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What is your salt-fog test protocol for coastal deployments?
Q.05How do you handle MC4 clone risk on residential / contractor programs?
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How do you handle MC4 clone risk on residential / contractor programs?
Q.06Lead time for a typical PV string harness program?
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Lead time for a typical PV string harness program?
Related Services
HARNESS TYPES
FOR SOLAR.
High-Voltage Harness
1500 V DC ESS battery interconnects with partial-discharge testing and HV interlock options.
Read moreWaterproof Harness
IP68 outdoor PV harnesses with stainless-steel cable glands for coastal salt-aerosol environments.
Read moreCustom Wire Harness
Microgrid distribution, combiner-box wiring and non-standard PV array topologies.
Read moreSolar / Energy Storage
Solar & Energy-Storage Harnesses.
HV-rated cable assemblies for solar inverter, ESS battery, and PV string interconnect programs.
HV battery cable + LV
Orange HV jacket + sealed LV pigtail
Real Project Snapshot · US · electrical-supply · 2024
A Build We Already Shipped In This Lane.
Scenario
A US electrical supply distributor required custom wire harnesses with specific Molex connectors, but a production batch had a dyeing/color deviation on the connector housings.
Challenge
Approximately 200 pieces of the wire harness assembly had connector coloring that did not match the strict aesthetic and technical requirements, risking rejection and project delay.
Outcome
Successfully reworked and delivered the batch without losing the client's trust; the client continued to place repeat orders in the following months without quality complaints.
Anonymized customer detail. Concrete numbers preserved verbatim.
Next Step
Solar Strings. ESS Harnesses. UL 4703 Out of the Box.
Send your PV array layout, ESS battery topology and inverter specs. Our energy engineering desk replies within 12 hours with a UL-aligned BOM. Quote returned within 12 hours. NDA on file. No obligation.