WATTME SOLAR - Energy Forecast

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About this app

WATTME SOLAR — Free Solar Energy Forecast & Smart Plan for Solar Panel Owners

Your roof generates free energy every day. Are you actually using every Watt of it?

WATTME SOLAR is the solar energy app for solar panel owners that turns hourly forecasts into a daily action plan.

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⚡ WHAT WATTME SOLAR DOES
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☀️ ACCURATE SOLAR FORECAST
Hourly production forecast based on your exact panel configuration: orientation, tilt, peak power (kWp), installation year, and real-time weather data. Supports up to 4 independent strings per home — because no two roofs are the same.

💰 REAL SAVINGS ESTIMATE
See exactly how much free energy you are self-consuming each day and track the real monetary value of every kWh you avoid buying from the grid. Every sunny day has a number — and WATTME SOLAR shows it to you.

🏠 PERSONALISED SMART PLAN
Every day, WATTME SOLAR generates a Smart Plan for your household: washing machine, dishwasher, dryer, oven, EV charger, boiler, heat pump, pool pump and more. It tells you the optimal start time for each appliance — so you run them on free solar power, not grid electricity.

📅 7-DAY WEEKLY OVERVIEW
Plan your week at a glance. See which days will generate the most energy and schedule your heaviest loads accordingly.

🔋 BATTERY-AWARE SCHEDULING
Have a home battery? The app factors in your storage capacity and generates two plans:
- Plan A — Maximize: schedules the most appliances, using the battery as a bridge when needed. Best for maximising savings.
- Plan B — Safety: zero grid draw guaranteed. Solar and battery only. Best when you want certainty on your bill.

📐 BUILT ON YOUR REAL SYSTEM
No generic estimates. WATTME SOLAR uses your actual panel specs combined with real-time irradiance data for your exact location. The more accurately you configure your system, the more precise the forecast.

🎯 SELF-CALIBRATING ACCURACY
After clear sunny days, the app can prompt you to calibrate against your actual inverter reading. Over time, forecast accuracy improves significantly — reaching the level of paid professional services, at zero cost.

🏡 MANAGE TWO HOMES
Beach house, rental, family home? Add a second solar system and switch between them instantly. Each home has its own independent forecast, Smart Plan, appliances and settings.

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✅ EVERYTHING INCLUDED, FREE
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- Daily & weekly solar production forecast
- Smart Plan A (Maximize) & Plan B (Safety)
- Washing machine, dryer, dishwasher, oven scheduling
- EV charger, battery, heat pump, boiler, pool pump support
- Up to 4 strings per home, up to 2 homes
- Season mode: Auto / Summer / Winter
- Forecast confidence indicator
- Self-calibration against your inverter reading
- Savings and self-consumption estimate
- No account required — all data stays on your device
- 100% free

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🔒 YOUR PRIVACY
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WATTME SOLAR does not collect personal data. Your system settings are stored locally on your device only. No login, no cloud sync, no personal data collected by us.

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Whether you have a 3 kWp starter system or a 15 kWp installation with battery and EV, WATTME SOLAR turns every Watt of sunshine into a concrete saving on your electricity bill.
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What’s new

Smarter Smart Plan: battery now influences appliance scheduling more precisely. Improved Annual screen: self-consumption simulator with 0-100% slider and real-time ROI estimate. Production trend based on real PVGIS data, valid worldwide. Various fixes and improvements.