About this app
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
Latest release
What’s New
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
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Oct 16, 2026 · 4:59 PM $0.99
Screenshots
