H1Z2Z2-K vs. PV1-F: Which Solar Cable Standard Should Your Project Specify?

1. Introduction: The Solar Cable Alphabet Soup

If you've ever looked at a spool of solar cable and wondered what "H1Z2Z2-K" or "PV1-F" actually means, you're not alone. These designations aren't brand names—they're code that describes the cable's construction, voltage rating, and applicable standard. And the difference between them matters a lot more than most buyers realize.

Here's the short version: H1Z2Z2-K (EN 50618) is the current, modern standard. PV1-F (TÜV 2PfG 1169) is the previous generation. For any new installation, especially if it's a 1500V DC system, H1Z2Z2-K is the appropriate choice. But the market is still full of PV1-F cables, and many buyers—particularly in price-sensitive markets—continue to specify them for projects where the voltage and environment would be better served by the newer standard.

The thing is, the cost difference per meter between the two is usually small. What's large is the difference in voltage rating, water ingress protection, and the scope of certified cross-sections. So let's walk through what each standard actually requires, where they diverge, and how to make a specification decision you won't second-guess in year 15 of a 25-year system life.

2. Decoding the Cable Designation

Type designations aren't random. Each letter and number tells you something specific:

H1Z2Z2-K:

• H — Harmonized type (CENELEC)
• 1 — Voltage class: 1.5 kV DC nominal
• Z2 — Insulation: cross-linked polyolefin (XLPO), halogen-free
• Z2 — Sheath: cross-linked polyolefin (XLPO), halogen-free
• K — Flexible conductor (IEC 60228 Class 5)

PV1-F:

• PV — Photovoltaic application
• 1 — Voltage class: historically 1.0 kV DC nominal
• F — Flexible conductor

The PV1-F designation, unlike H1Z2Z2-K, doesn't encode the insulation and sheath material in the name itself. Those are defined by the manufacturer's specification under the TÜV 2PfG 1169 certificate.

3. The Two Standards: Where They Come From

TÜV 2PfG 1169/08.2007 was developed by TÜV Rheinland in the mid-2000s as a certification specification for cables used in photovoltaic systems. At the time, there was no European harmonized standard specifically for solar cables—installers were using generic rubber or PVC cables that degraded quickly under UV exposure. 2PfG 1169 filled that gap and served the industry well for over a decade.

EN 50618:2014 was developed by CENELEC (the European Committee for Electrotechnical Standardization) as the first Europe-wide harmonized standard for photovoltaic cables. It was designed to supersede the various national and third-party specifications—including 2PfG 1169—and to raise the testing bar in several important areas. It's since been adopted across the EU, and many non-European markets also reference it in their national codes.

4. Head-to-Head: Key Technical Differences

* Some manufacturers offer PV1-F cables up to 50 mm² or larger under extended certification. The 35 mm² limit reflects the original 2PfG 1169 specification scope.

5. Testing Deep Dive: What EN 50618 Adds

In my view, the real story is in the testing regime. Both cables will work for basic solar applications. Where EN 50618 raises the bar is in how it tests—the methodology is more clearly defined and the pass criteria are more stringent in several areas.

Ozone Resistance (EN 60811-403)

Ozone is present in the upper atmosphere and around electrical equipment. It attacks unstabilized rubber and polyolefin compounds, causing surface cracking that deepens under mechanical stress. Both standards require ozone resistance testing—EN 50618 via EN 60811-403 and 2PfG 1169 via EN 50396 Method B (typically 250 pphm at 40°C for 72 hours). The test methods differ slightly, but both are designed to prevent surface cracking in ozone-rich environments. For rooftop installations in high-UV areas—where ozone concentrations are naturally elevated—this is a meaningful requirement regardless of which standard you specify.

Thermal Endurance (EN 60216)

Both standards claim a 25-year design life, but EN 50618 requires it to be verified through Arrhenius-style accelerated thermal aging per EN 60216. The cable must demonstrate that its insulation and sheath retain sufficient mechanical properties after aging at multiple temperature points, with the results extrapolated to a 25-year service temperature index. A PV1-F cable might deliver the same field life—but it hasn't been tested to prove it in the same way.

Water Immersion — AD8 vs AD7

The immersion rating difference deserves attention. AD7 means the cable can withstand temporary submersion (think heavy rain or shallow puddles). AD8 means it can handle permanent submersion—relevant for floating solar, cable runs in water-filled trenches, or high-humidity tunnel environments. For a standard rooftop installation, AD7 is probably sufficient. For a ground-mount system where cables enter the soil, or for any floating solar application, AD8 is the safer choice.

6. Market Acceptance: Which Standard Where?

7. The Cost Question

Here's what I've seen across hundreds of procurement RFQs: the price gap between a certified H1Z2Z2-K cable and a comparable PV1-F cable from the same manufacturer is typically $0.02–$0.08 per meter for common sizes (4–6 mm²). For a 500 kW ground-mount system requiring roughly 8,000–10,000 meters of DC cable, that's a total difference of about $200–$800—essentially negligible in the context of the total project cost.

Where the difference isn't negligible is in the cross-section range. PV1-F is generally certified only up to 35 mm². For utility-scale solar farms where DC cable runs use 50–150 mm², H1Z2Z2-K is the only option—not because of preference, but because the certification doesn't exist for PV1-F at those sizes.

8. SORIVO's Approach: Dual-Certified, One Less Headache

At Sorivo, we took the view early on that asking customers to choose between standards wasn't doing anyone any favors. Our solar cables are dual-certified to both EN 50618 and TÜV 2PfG 1169 (depending on size and product variant), which means:

• You don't need to match cable certification to a specific project market. The same cable works for EU, UK, Middle East, and Asian projects.
• Our H1Z2Z2-K cables use Class 5 tinned copper conductors per EN 50618, with double-layer XLPO insulation and sheath. They carry the same cross-section range as the standard allows—from 1.5 mm² up to 240 mm².
• Each production batch is third-party tested to the applicable standard. Test reports are available on request with the batch number.
• For customers who still need PV1-F for legacy system repairs or replacement, we maintain that certification as well—so you're not forced to upgrade your entire stock if you're maintaining an existing installation.

Our dual-certified solar cable range includes:

• H1Z2Z2-K 4 mm² Tinned Copper Solar Cable — EN 50618 + TÜV, most common size for residential strings
• H1Z2Z2-K 6 mm² Tinned Copper Solar Cable — EN 50618 + TÜV, common for commercial strings
• PV1-F 4 mm² Tinned Copper Solar Cable — TÜV 2PfG 1169, for legacy system maintenance

9. Field Identification: How to Tell H1Z2Z2-K from PV1-F

If you're looking at a cable on site and need to confirm which standard it's certified to, here are the quick checks:

Read the cable markings. A certified cable will have its type designation printed along the sheath every meter or so. If it says "H1Z2Z2-K," it's EN 50618. If it says "PV1-F," it's TÜV 2PfG 1169. If it doesn't say either—walk away.

Check the test voltage on the print line. EN 50618 cables are marked with 1.5 kV DC or 1.8 kV DC. PV1-F cables will show 1.0 kV DC or 0.6/1.0 kV AC.

Look for the certification mark. A genuine TÜV-certified PV1-F cable will carry the TÜV Rheinland logo and certificate number on the sheath. An EN 50618 cable may carry a mark from a notified body or the manufacturer's declaration of conformity to the harmonized standard.

10. Choosing the Right Standard: A Decision Guide

11. Frequently Asked Questions

12. Conclusion: The Standard You Choose Shapes Your Project's Risk Profile

To be honest, neither standard is bad. PV1-F served the solar industry well for over a decade and continues to be specified in many markets. But standards evolve for a reason. EN 50618 was developed to address failure modes—ozone cracking, long-term thermal degradation, water ingress—that the earlier specification didn't fully cover, and the industry's experience since 2014 has confirmed those gaps were real.

If you're procuring cable for a new installation today, especially one that will operate for 25 years, H1Z2Z2-K is the standard I'd recommend. The cost premium is small, the certification is current, and the testing is more comprehensive. For legacy system repairs, PV1-F remains a valid choice. But for anything new—H1Z2Z2-K removes questions before they get asked.

Reviewed by Luo Qiang — Senior Cable Application Engineer, Sorivo
15+ years in industrial and renewable energy cable specification. Member of IEC TC 20 (Power Cables). Previously contributed to cable selection for 500MW+ solar PV and BESS projects across Asia, Europe, and the Middle East.