NABCEP Solar: String Sizing - Voltage, Current, Temperature Limits — Flashcards | Solar Technician | FatSkills

NABCEP Solar: String Sizing - Voltage, Current, Temperature Limits — Flashcards

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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.

1 of 8 • Ready
Cold temperatures cause module voltage to:
Increase
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