Why temperature matters / Por qué importa la temperatura
At low cell temperature, PV module open-circuit voltage (Voc) typically rises and can exceed an inverter's absolute DC input limit. At high cell temperature, maximum-power voltage (Vmp) typically falls and may drop below the MPPT tracking window. Parallel strings also increase operating and short-circuit current.
En frío, Voc normalmente aumenta; en calor, Vmp disminuye. Las cadenas en paralelo suman corriente. Por eso el número de paneles en serie debe revisarse con los límites reales del inversor y la ficha del módulo.
Compare temperature-adjusted string Voc against absolute DC maximum.
Compare both operating extremes against the MPPT tracking window.
Check Imp and Isc against per-MPPT input limits.
Print PDF, export CSV, save/restore project JSON.
Free worked example / Ejemplo gratuito
Illustrative inputs only, not a real inverter or module recommendation. Replace with exact manufacturer data.
| Input / Dato | Example / Ejemplo |
|---|---|
| PV module Pmax / Potencia | 550 W |
| Module Voc / Vmp (STC) | 49.9 V / 41.9 V |
| Voc / Vmp temperature coefficients | −0.275%/°C / −0.350%/°C |
| Cell temperature min / max | 0°C / 70°C |
| MPPT range; absolute DC max | 120–450 V; 500 V |
| Series × strings/MPPT × MPPTs | 8 × 2 × 1 = 16 modules |
| Calculated cold string Voc | 426.65 V (< 500 V) |
| Calculated hot string Vmp | 282.41 V (> 120 V) |
| Calculated operating current / MPPT | 26.26 A (Imp 13.13 A × 2) |
| Array nameplate DC power | 8.80 kWp |
Formula: V(T) = V(STC) × [1 + coefficient (%/°C)/100 × (cell temperature − 25°C)]. Example cold Voc = 8 × 49.9 × [1 + (−0.275/100) × (0 − 25)] = 426.65 V.
What the licensed worksheet includes / Qué incluye
Editable project, customer and equipment information; temperature-corrected voltage results; indicative series range; seven validation checks; comparison against module inventory and inverter current limits; browser autosave; JSON backup/restore; CSV export; and a print-ready bilingual report.
Herramienta local para instaladores solares, proyectos de bombeo, técnicos y presupuestistas. Sin mensualidades, servidor ni conexión a Internet.
Important engineering limitations / Limitaciones
The software is a preliminary calculation worksheet, not electrical design approval or safety certification. Cell temperature differs from ambient temperature. Check manufacturer startup requirements, exact MPPT ratings, allowable strings per MPPT, wire sizing, fuses, overcurrent protection, grounding, surge protection, installation rules and local codes. The worked example is not a procurement recommendation.
Request the licensed tool / Solicitar herramienta
US$9 one-time. Receive one offline HTML application, quick-start guide and single-business internal-use license. Payment and delivery are arranged manually by email; this page does not process payments.
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