Short answer: MC4 solar connector models should be matched by DC voltage, current rating, cable size range, contact material, protection rating and connector compatibility.
| 1000V MC4 | Used in many standard photovoltaic string systems. Confirm rated current and cable size. |
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| 1500V MC4 | Used for higher-voltage PV systems. Confirm system voltage, insulation material and certification requirement. |
| Current rating | Common ratings include 30A and 45A. Match to cable size and system design. |
| Compatibility | Do not mix connectors from incompatible systems without project approval and contact resistance verification. |
MC4-compatible appearance is not enough. Locking fit, contact resistance and cable range must match the project requirement.
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