# Sunplan: Solar Forecast — 3-day PV production forecast

> 3-day PV production forecast (iPhone/iPad app by Krystian Bylica.)

- Source: https://appshunter.io/ios/app/sunplan-solar-forecast/id6809924478 (this page in markdown: same URL + `.md`)
- Developer: [Krystian Bylica](https://appshunter.io/developer/954863122)
- Category: Utilities, Weather
- Price: Free
- Age rating: 4+
- Requires: iOS 18.0 · 1 MB
- Languages: American English
- Released: 2026-10-01
- Data updated: 2026-10-12
- User reviews in markdown: https://appshunter.io/ios/app/sunplan-solar-forecast/id6809924478/reviews.md

## What is Sunplan?

Sunplan predicts how much energy your solar installation will produce — hour by hour, seven days ahead.

This is not a weather app with a chart bolted on. Sunplan calculates output from a physical model: the sun's position for your exact coordinates, your roof geometry, and how forecast cloud cover attenuates solar radiation.

HOW IT WORKS

You enter your installation parameters: capacity, azimuth, tilt angle and location. Sunplan computes clear-sky irradiance, then corrects it for forecast cloud cover from Apple WeatherKit. The result is predicted production in kWh, for every hour and as a daily total.

WHAT YOU GET

- 3-day production forecast
- Hourly breakdown with the daily production peak
- Daily totals in kWh
- Day-to-day comparison
- Multiple installations, if you have more than one array

WHO IT'S FOR

For anyone running rooftop solar who wants to plan self-consumption. Know in advance which day is worth running the dishwasher, the washing machine or the EV charger — and when to charge your home battery from the grid instead.

PRIVACY

Sunplan has no server. Every calculation runs on your iPhone. No account, no email, no sign-in. Your installation parameters stay on the device.

I collect nothing. No ads, no tracking.

ABOUT ACCURACY

A production forecast is only as good as the cloud forecast behind it. Next-day predictions are usually close. The further out the day, the wider the uncertainty — especially under broken cloud, when output swings minute to minute.

Sunplan shows a prediction, not a promise. Treat it as a planning tool.

WHAT SUNPLAN DOESN'T DO

It doesn't connect to your inverter or read actual production. It doesn't control anything in your home. Nothing to install beyond the app.

I built Sunplan because I run solar at home and wanted to know what to expect. I'm still developing it — if something's missing, write to me.


## Version history (last 1 release)

### 1.0 — 2026-10-01

No release notes.

## More apps by Krystian Bylica

- [Atlas ćwiczeń KFD.PL](https://appshunter.io/ios/app/atlas-cwiczen-kfdpl/id1292272433)
- [Carotty](https://appshunter.io/ios/app/carotty/id1518972858)
- [RCE Prosument](https://appshunter.io/ios/app/rce-prosument/id6800769784)

All apps by Krystian Bylica: https://appshunter.io/developer/954863122

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-12.*