Solar Inverter
NEC 690.7(A) Inverter
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Solar Inverter Sizer verifies inverter-to-array compatibility for solar PV systems per NEC Article 690.
Features:
- DC/AC ratio calculation with optimal range guidance (1.1-1.3)
- NEC 690.7(A): String Voc at minimum temperature vs max DC input voltage
- NEC 690.8(A): Current capacity check (Isc x 1.25)
- MPPT voltage range verification
- Support for string, micro, and hybrid inverter types
- Temperature coefficient adjustment for cold climate sizing
- Compatibility status: compatible, incompatible, oversized, undersized
- Save calculations to history
- Export professional PDF reports
- Works offline
Standards: NEC 690.7(A), NEC 690.8(A)
Contact: support@tradetools.dev
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What's New in Solar Inverter
1.0.2
June 13, 2026
Inverter current check now follows the printed NEC 690.8(A)(1) rule: - Imax = array Isc x 1.25 compared against inverter max DC input (was x1.5625 - the extra 125% continuous factor belongs to conductors/OCPD, not equipment ratings; normal arrays no longer flag as incompatible) - Result cites the rule and reminds to verify the inverter max short-circuit input rating
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