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News & Technical Notes

Selection guides and installation notes from our engineering team.

Connectors

How to Choose MC4 Connectors for 1000V vs 1500V PV Systems

The connector voltage rating must match the maximum system voltage of the array. With 1500V systems becoming the norm in utility-scale projects, here is what to check before you order.

  • Match the connector's rated voltage to the system's maximum voltage (e.g. 1500V DC for 1500V strings).
  • Check the cable cross-section range: 2.5–6 mm² covers most rooftop strings; 4 mm² is typical for 1500V projects.
  • Confirm the IP rating for the installation environment — IP67 is standard, IP68 offers extra protection for wet locations.
  • Ask for the certificate number (our 1500V connector is covered by TÜV Rheinland R 50373614) and keep copies for the project file.
  • Use the same brand of plug and socket pair — mixing brands can cause contact heating and failures.
Cables

H1Z2Z2-K vs PV1-F: Which Solar Cable Fits Your Project?

Both cables are designed for 25 years outdoors, but they serve different markets and standards. A quick comparison to help you specify correctly.

  • H1Z2Z2-K is the European standard (EN 50618) — 1500V DC, XLPE double insulation, TÜV approved.
  • PV1-F 1169 is the UL standard (2pfg 1169) used in North American projects — 1000V DC, UL approved.
  • For Europe, Middle East and most export projects, H1Z2Z2-K is the safest specification.
  • For US/Canada, choose PV1-F 1169 and confirm the UL listing with your inspector.
  • Both are available from us with cut lengths and pre-assembled MC4 connectors.
Quality

Common Causes of PV Connector Failures (and How to Avoid Them)

Most field failures come from installation practice, not the connector itself. These five checks prevent the most common problems.

  • Poor crimping — use the correct crimping tool and check pull force on a sample every day.
  • Incorrect stripping length — too long exposes copper, too short causes high resistance.
  • Mixing brands — plug and socket from different manufacturers may not interlock safely.
  • Water ingress — damaged seals or loose cable glands are the main cause of IP failures.
  • Overheating — undersized cable or loose contact raises resistance; check with a thermal camera during commissioning.
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