SolarCalc PV Pro+ vs Voltbox

SolarCalc PV Pro+ is the ultimate professional toolkit for solar PV system designers, electrical engineers, and solar installation professionals. Packed with 39+ powerful tools, interactive visualizations, and comprehensive reference data — everything you need in one app. ▸ SOLAR PV TOOLS • PV System Sizing - Calculate panel count, inverter size, and battery capacity • Shadow Analysis — Determine shadow length and impact on panel placement • Solar Rooftop — Estimate roof area and panel fitting capacity • Solar Water Pumping — Size PV-powered water pump systems • Off-Grid Load & Sizing — Full off-grid system design with battery backup • Monthly Radiation & Tilt — Optimal tilt angles by month and location • Solar Map — Interactive irradiance map with real-time location data • Sun Path Diagram — Polar sun path visualization with current position • Energy Yield Simulation — Annual energy production with CO₂ savings • Panel Layout Optimizer — Visual roof layout planner with panel grid • Camera Sun Finder — AR overlay showing real-time sun position ▸ ELECTRICAL CALCULATORS • Ohm's Law — V, I, R, P calculations • Voltage Drop — Cable voltage loss analysis • Cable Sizing — Minimum cross-section calculator • DC/AC Power Conversion — Inverter power calculations • Power Factor — cos φ correction analysis • Motor HP — Watt ↔ Horsepower conversion • Inverter Calculator — DC/AC inverter sizing • Conductor Resistance — R = ρL/A calculations • Busbar Current — Current carrying capacity • Transformer Calculator — Ratio and current analysis • Fault Level — Transformer fault MVA • Earthing Conductor — Grounding conductor sizing ▸ REFERENCE TABLES (12) • AWG & SWG Wire Gauge Tables • IP Rating Protection Guide • Material Resistivity Data • PV Cell & Module Specifications • World Electrical Standards • Voltage Classification • AC Breaker Types • Cable Short Circuit Ratings • ANSI Device Numbers • Power Cable Coding • Transmission Conductor Data ▸ PRO FEATURES • Save & Export Projects as PDF • Interactive Solar Map with live irradiance data • AR Camera Sun Finder • Panel Layout Optimizer • Complete reference library ▸ WHY SOLARCALC PV PRO+? • Works offline — no internet required for calculations • Professional-grade accuracy • Beautiful dark/light theme with auto-sunset mode • Location-based solar data • Regular updates with new tools Designed by solar professionals, for solar professionals. Developed by CLK Company https://clk.company Terms of Use: https://solarcalc.net/app/terms Privacy Policy: https://solarcalc.net/app/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Voltbox: PV Installer Toolkit is a professional calculator toolkit for solar/PV installers, built around NEC Articles 690 and 705. Fast, accurate, and yours to own — pay once, keep it forever. 12 CALCULATORS Array & String Design (free) • String Sizing — max modules per string, temperature-corrected (NEC 690.7) • PV Circuit Sizing — conductor & OCPD sizing for source circuits (NEC 690.8/690.9) Interconnection & Safety • 120% Rule — backfeed breaker vs. busbar interconnection check (NEC 705.12) • Rapid Shutdown — array boundary & voltage/time limits reference (NEC 690.12) • DC Arc-Fault Protection — whether 690.11 AFCI protection applies to your install Circuit Installation • Voltage Drop — DC array-to-inverter run (NEC Ch. 9 Table 8) • Conduit Fill — DC source/output conductors in conduit (NEC Ch. 9 Table 1) • Grounding & Bonding — GEC (690.47) and EGC (690.43/250.122) sizing • AC Output Sizing — inverter output circuit conductor & OCPD (NEC 690.8) • Rooftop Temp Adder — ambient temperature correction for rooftop conduit (NEC 310.15(B)(3)(c)) Storage & Estimates • Battery Sizing — ESS backup capacity from critical load & duration • Production Estimate — quick annual output ballpark from peak sun hours WHY VOLTBOX • One-time purchase for Pro — never a subscription, never a recurring fee • Save and organize calculations by project • Built for the job site: fast, no clutter, no login screens, works with no signal • No account required — open the app and start calculating String Sizing and PV Circuit Sizing are free. Unlock Pro once to get every other calculator. Voltbox is a reference tool based on the NEC. Always verify results against the current code edition adopted in your area and confirm compliance with a licensed electrician or installer before performing any installation.