Buyer's guide: solar DC accessories for Australia and New Zealand

Seven questions our buyers ask most, answered straight — cable standards, connector compatibility, cable sizing, fuses, Y-branches, certificate numbers, and what to check before you import.

1. Is H1Z2Z2-K cable required in Australia?

Australian installations follow AS/NZS 5033 and each state's electrical rules, and DC strings are wired in a flexible, double-insulated cable that resists UV and ozone. In practice the market treats H1Z2Z2-K to EN 50618 as the safe answer: 1500V DC rated, tinned copper, cross-linked insulation that survives a Queensland roof.

AIYI Energy supplies H1Z2Z2-K in 4 mm² and 6 mm² — TÜV SÜD certificate B 121070 0001, CE certificate 4Q240227.ZPTU058.

2. Which certificate numbers prove the connectors and cable are compliant?

Ask for the number, not the logo. Our connectors carry CE certificate 4Q240331.ZPTUN26, tested to IEC 62852. Our cable carries TÜV SÜD certificate B 121070 0001 and CE certificate 4Q240227.ZPTU058 to EN 50618.

Every number can be checked with the issuing body, and the PDFs are on our certificates page. If a supplier cannot give you a number you can look up, you are buying a photo of someone else's certificate.

3. What is the difference between MC4 connectors and "MC4-compatible" connectors?

MC4 is a connector type originally created by Multi-Contact (now Stäubli). Other manufacturers make MC4-compatible connectors to the same mating dimensions. Used within one brand, they work.

The failure case is mixing: one brand's plug into another brand's socket on the same string. That is the most common source of hot joints and callbacks, along with crimping with the wrong die. Standardise on one brand per project and use the matching crimp tool.

4. Should I use 4 mm² or 6 mm² solar cable?

4 mm² H1Z2Z2-K is the normal choice for residential strings. Go to 6 mm² when the run is long, when strings are paralleled, or when voltage drop starts costing more than the cable.

Both sizes are 1500V DC rated and take the same MC4 connectors — the decision is ampacity and voltage drop, not connector size.

5. When should an in-line fused connector be used?

Wherever a smaller cable feeds a larger current source: battery leads, combiner tails, and parallel branches that need protection. The fuse must be DC rated and matched to the cable it protects, not to the load.

We make sealed in-line fuse holders with replaceable fuses for solar and battery applications, so a blown fuse is a five-minute fix instead of a new harness.

6. What is an MC4 Y-branch and when is it used?

A Y-branch (2-to-1 or 4-to-1) parallels two or four strings into one cable without a combiner box — useful on roofs and carports where space is tight and the string count is low.

Choose moulded branch connectors rated 1500V DC, and keep the combined current inside the branch rating. If you are paralleling more than four strings, a combiner is usually the better answer.

7. What should I check before importing solar DC accessories into Australia or New Zealand?

Four things: a certificate number you can verify with the issuing body; the standard the product is tested to (IEC 62852 for connectors, EN 50618 for cable); the IP rating and temperature range on the datasheet; and whether the supplier will do a small trial order before a full container.

AIYI Energy quotes FOB Ningbo, 13% VAT invoice available, sample sets before volume orders, and we can meet you in Brisbane or on the Gold Coast.