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NABCEP Solar: String Sizing - Voltage, Current, Temperature Limits
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Avg score: 80% • Most missed: “NEC requires conductor sizing based on:”

String sizing ensures:
• Voc at lowest temperature does NOT exceed inverter max DC voltage.
• Operating voltage stays within MPPT window.
• Current limits are respected.
Worked example:
If inverter max DC input is 600V and cold-corrected Voc per module is 50V,
Maximum modules in series = 600 ÷ 50 = 12 modules.

NABCEP Solar: String Sizing - Voltage, Current, Temperature Limits
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8 Questions

1. Series wiring increases:
2. NEC requires conductor sizing based on:
3. Parallel wiring increases:
4. Cold temperatures cause module voltage to:
5. Exceeding inverter max DC voltage can:
6. Overvoltage risk is greatest during:
7. MPPT window defines:
8. Temperature correction uses:

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