OnSun vs SolarCalc Pro

OnSun predicts your rooftop solar seven days ahead and tells you the best time to use power. Use the app to look ahead and schedule the laundry, the dishwasher and the EV charger on energy you already made, instead of buying it back at night. WHAT ONSUN DOES • 7-day solar forecast: hourly solar generation and daily solar production in kWh, customized for your system • Predicts solar output and solar irradiance for your panels and your location • A confidence range on every solar prediction, so you see best and worst case • Tells you when to run appliances, then sends a solar reminder • Solar savings per appliance - what you save, in dollars and in kWh • Solar usage and solar self consumption shown over time • Sunny days flagged a week out, with the peak hours worth planning around • Rainfall overlaid on the sunshine, so you can pick the best time to dry the laundry if you don't use a dryer SOLAR APPLIANCES YOU CAN SCHEDULE • Washer and dryer • Dishwasher • Solar EV charging - an EV charging schedule built around the sunniest days • Solar pool pump timing • Air conditioning and space heater • Oven and dehumidifier WORKS WITH ANY INVERTER It makes no difference whose inverter you have. OnSun never connects to your inverter. No hardware, no wiring, no login. Your location, panel size and the local weather are all it needs. Compare the forecast against what you actually get and adjust the performance setting to sharpen it. An inverter app only shows what already happened, when the chance to do anything is gone. OnSun looks ahead instead - part calculator, part planner, part weather app. WHY TIMING BEATS EXPORTING Every kWh you use while the sun is up is a kWh you don't buy from the grid at the electricity prices your utility charges. Solar export earns a net metering credit worth a fraction of that, and even off-peak rates cost more than sunshine. Shift the load into daylight and you reduce your electricity bill. SOLAR SCHEDULING, SET ONCE Every appliance draws a different number of watts. A dishwasher runs in short bursts, an EV charger pulls for hours. OnSun matches each power profile against your PV forecast, works out when to run appliances, then sends the notification or alert when it is time. HOW THE PV FORECAST WORKS Professional weather data, modelled against the sunlight your panels actually capture. The same modelling used for large commercial rooftop PV systems, now in your pocket. There is no cheap electricity like the power you already own. FREE vs PRO Free: 3-day forecast, 2 appliances. Pro: full 7-day forecast, unlimited appliances, more frequent forecast updates, and long-term home energy insights so you can watch the power bill and the energy bill come down. You paid for the panels. Download OnSun free and put your home solar to work. Terms of Use: https://onsun.app/terms-of-service.html Review: "I'm terrible at remembering to make the most of my solar and end up giving it all away to the grid, but this sends me reminders and plans the next few days for me. The notifications are great, I actually get up and put the washer on! Even started meal prepping with the oven at peak solar time. Can see this saving me from wasting power real quick." - Andytar

SolarCalc Pro turns your iPhone into a complete off-grid solar design toolkit for installers, PV designers, and renewable energy enthusiasts who can't rely on cell signal in remote builds. Get accurate solar panel sizing, battery bank configuration, daily load estimation, inverter sizing, charge controller selection, and cable gauge calculations — all in one app, 100% offline. Designed for solar professionals, electrical engineers, and DIY off-grid enthusiasts who need fast, reliable calculations in the field or at the desk. Every calculation runs on-device with zero connectivity required. SOLAR CALCULATORS: • Solar Panel Calculator — Calculate the exact number of panels and total wattage needed for your off-grid system. Factor in location, sun hours, system losses, and panel specifications to get precise sizing recommendations. • Battery Bank Calculator — Design your battery bank with confidence. Calculate total capacity (Ah/kWh), determine series/parallel configuration, and account for depth of discharge (DoD) for lead-acid, AGM, gel, and lithium batteries. • Daily Load Calculator — Estimate your total daily energy consumption in watt-hours. Add appliances with their wattage and daily usage hours to build a comprehensive load profile for accurate system sizing. • Inverter Sizing Calculator — Size your inverter based on total load, surge requirements, and system voltage. Supports 12V, 24V, and 48V configurations with proper safety margins and efficiency factors. • Charge Controller Calculator — Determine the right charge controller amperage and type (PWM vs MPPT). Calculates based on panel array voltage, current, and battery bank specifications. • Cable Sizing Calculator — Calculate proper cable gauge (AWG/mm²) for DC and AC runs. Accounts for voltage drop, current capacity, cable length, and temperature derating to ensure safe, efficient wiring. REFERENCE GUIDES: • Solar Panel Specifications — Quick reference for common panel wattages, voltages, and current ratings. Monocrystalline, polycrystalline, and thin-film comparison data. • Battery Technology Guide — Compare lead-acid, AGM, gel, and lithium-ion (LiFePO4) batteries. Cycle life, DoD limits, temperature performance, and cost per kWh. • Wire Gauge Reference — AWG to mm² conversion tables, ampacity charts, and voltage drop percentages for standard cable sizes used in solar installations. BUILT FOR THE FIELD: • Calculation History — Recent calculations saved automatically. Review and compare past results across different projects and system designs. • Unit Toggle — Switch between Imperial (US) and Metric (SI) units with one tap. Watts, amps, volts, AWG/mm², feet/meters. • Dark Mode — Full dark/light mode support for any environment. • 100% Offline — No internet required. Every calculation and reference runs entirely on-device. Use it on the rooftop, at the job site, or at your desk. WHO IS THIS FOR: • Solar Installers & PV System Designers • Electrical Engineers & Contractors • Off-Grid & Tiny Home Enthusiasts • RV & Van Life Solar DIYers • Renewable Energy Students & Educators • Homestead & Cabin Owners • Marine & Boat Solar Installers • Emergency Preparedness Planners Built for solar professionals and enthusiasts by people who understand the industry. SolarCalc Pro uses industry-standard formulas and calculation methods — not guesswork. From beginner to senior engineer, this is the off-grid solar calculator that belongs in your pocket. Terms of Use (EULA): https://solarcalcpro.volvoxmobile.com/terms Privacy Policy: https://solarcalcpro.volvoxmobile.com/privacy