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# HelioPeak > HelioPeak is an iPhone and iPad app that also runs on Macs with Apple silicon (the iPad version), for tracking residential solar panel production via PVOutput.org, plus a technical blog about solar monitoring, home batteries, and the data behind residential solar in Belgium and Europe. ## About HelioPeak reads solar production data directly from the PVOutput.org API and displays it with beautiful charts, multi-year analysis, and detailed statistics. Built with SwiftUI and Swift Charts for iPhone and iPad; the iPad version also runs on Macs with Apple silicon. No intermediary HelioPeak server: the API key is sent only from the device to PVOutput.org when retrieving data. Six languages: English, Dutch, French, German, Italian, Spanish. One-time in-app purchase, no subscription. Developed by Sven De Troch (SVDT-Consultancy bv), based in Belgium. ## Key Features - Live dashboard with real-time production curve, peak power, and self-consumption - Five chart periods: day, week, month, year, all-time - Calendar and rolling chart modes - Day, week, month and year arrows and a date picker in Charts - Target line from the owner's PVOutput monthly estimates in the Week, Month and Year charts and System Details - Year-over-year comparison with PDF export - Annual Report PDF for any completed year, on demand - Calendar heatmap of full year production (iPad) - Notes feature with iCloud sync: attach annotations to specific dates - CSV and JSON export with full data history - Export for AI: one Markdown file for the AI assistant of your choice - Home Screen widgets in three sizes and Lock Screen widgets - Siri and Shortcuts: today's, yesterday's and this month's production - Solar Moments: shareable cards for records, milestones and recaps, with statistics, export and import - Multiple systems with drag-to-reorder and system health indicators - CO₂ savings tracking with tree equivalent - Estimated revenue based on configurable electricity price - Built-in demo mode - Dark and light mode - Privacy-first: no cross-app tracking, no ads, no HelioPeak server; anonymous usage data and crash reports (on by default) can be switched off ## Pricing Free with one solar system plus a built-in demo. One-time in-app purchase (€6.99) unlocks unlimited systems. No subscription planned for the core app. ## Requirements - iOS 18.6 or later (iPhone, iPad) - A Mac with Apple silicon runs the iPad version (Macs with an Intel processor cannot run it) - A PVOutput.org account with a read-only API key ## Blog A series of 16 technical articles about residential solar in Belgium and Europe. All articles are originally written in English by the developer; Dutch, French, German, Italian, and Spanish translations are AI-assisted and reviewed. ### Installation and setup - [What to consider before installing solar panels](https://heliopeak.app/blog/what-to-consider-before-installing-solar-panels): Orientation, inverter sizing, and the questions installers don't always ask. - [Self-consumption versus feeding back to the grid](https://heliopeak.app/blog/self-consumption-vs-grid-feed-in-2026): Why the maths changed in Belgium and the Netherlands, and what to do about it. - [Setting up consumption monitoring](https://heliopeak.app/blog/setting-up-solar-consumption-monitoring): P1, Shelly, or inverter CT clamps (the three routes that work in Belgium). ### PVOutput and monitoring - [What is PVOutput.org, and why solar owners keep coming back](https://heliopeak.app/blog/what-is-pvoutput-org): A platform-independent backbone for residential solar data. - [Getting your data into PVOutput](https://heliopeak.app/blog/getting-data-into-pvoutput): Direct push, Auto Uploader, Home Assistant, custom scripts, manual entry. - [Why a smartphone app changes how you understand solar production](https://heliopeak.app/blog/why-a-solar-monitoring-app-matters): The dashboard problem and the case for ambient awareness. - [How HelioPeak fits into the picture](https://heliopeak.app/blog/monitor-pvoutput-on-ios-with-heliopeak): A native iOS app for reading PVOutput data, and the design decisions behind it. ### Equipment and diagnostics - [Home batteries in 2026](https://heliopeak.app/blog/home-batteries-2026-sonnen-vs-marstek): Real-world comparison of Sonnen Battery 10 versus three Marstek Venus E v3 units. - [How to spot a failing solar panel before your installer does](https://heliopeak.app/blog/how-to-spot-a-failing-solar-panel): Failure modes, data signatures, visual signs, and warranty leverage. ### Data and reflections - [Reading your solar charts: what the numbers actually mean](https://heliopeak.app/blog/reading-solar-charts-kwp-specific-yield-performance-ratio): kWh, kWp, Specific Yield, Performance Ratio, and Peak Power. - [Estimates versus reality](https://heliopeak.app/blog/solar-estimates-vs-reality): Why solar panels rarely produce what the brochure promised. - [A year of data: what the seasons taught me](https://heliopeak.app/blog/year-of-solar-data-seasonal-patterns): The rhythm of Belgian solar across a full calendar year. - [We tested 6 AI assistants on the same solar data](https://heliopeak.app/blog/we-tested-6-ai-assistants-on-solar-data): Claude, ChatGPT, Gemini, Google AI Studio, Grok, and Copilot analysed the same export, and their answers diverged so much the prompt had to be redesigned. ### Apps, privacy, and behind the scenes - [Solar monitoring on iOS: comparing the options in 2026](https://heliopeak.app/blog/best-pvoutput-apps-for-ios-2026): Honest comparison of the four PVOutput iOS apps with explicit conflict-of-interest disclosure. - [The privacy question: what data does a solar monitoring app actually need?](https://heliopeak.app/blog/solar-monitoring-app-privacy): Production data is innocuous, consumption data tells a story. - [Building HelioPeak: lessons from indie iOS development](https://heliopeak.app/blog/building-heliopeak-indie-ios-development): The story of building a small native app for a niche audience. ## Translated articles (NL / FR / DE / ES / IT) All 16 articles are available in six languages. Slugs are identical across languages; only the language prefix changes. ### Dutch (Nederlands): /blog/nl/ - https://heliopeak.app/blog/nl/what-to-consider-before-installing-solar-panels - https://heliopeak.app/blog/nl/self-consumption-vs-grid-feed-in-2026 - https://heliopeak.app/blog/nl/why-a-solar-monitoring-app-matters - https://heliopeak.app/blog/nl/what-is-pvoutput-org - https://heliopeak.app/blog/nl/getting-data-into-pvoutput - https://heliopeak.app/blog/nl/setting-up-solar-consumption-monitoring - https://heliopeak.app/blog/nl/monitor-pvoutput-on-ios-with-heliopeak - https://heliopeak.app/blog/nl/home-batteries-2026-sonnen-vs-marstek - https://heliopeak.app/blog/nl/reading-solar-charts-kwp-specific-yield-performance-ratio - https://heliopeak.app/blog/nl/solar-estimates-vs-reality - https://heliopeak.app/blog/nl/how-to-spot-a-failing-solar-panel - https://heliopeak.app/blog/nl/year-of-solar-data-seasonal-patterns - https://heliopeak.app/blog/nl/best-pvoutput-apps-for-ios-2026 - https://heliopeak.app/blog/nl/solar-monitoring-app-privacy - https://heliopeak.app/blog/nl/building-heliopeak-indie-ios-development - https://heliopeak.app/blog/nl/we-tested-6-ai-assistants-on-solar-data ### French (Français): /blog/fr/ - https://heliopeak.app/blog/fr/what-to-consider-before-installing-solar-panels - https://heliopeak.app/blog/fr/self-consumption-vs-grid-feed-in-2026 - https://heliopeak.app/blog/fr/why-a-solar-monitoring-app-matters - https://heliopeak.app/blog/fr/what-is-pvoutput-org - https://heliopeak.app/blog/fr/getting-data-into-pvoutput - https://heliopeak.app/blog/fr/setting-up-solar-consumption-monitoring - https://heliopeak.app/blog/fr/monitor-pvoutput-on-ios-with-heliopeak - https://heliopeak.app/blog/fr/home-batteries-2026-sonnen-vs-marstek - https://heliopeak.app/blog/fr/reading-solar-charts-kwp-specific-yield-performance-ratio - https://heliopeak.app/blog/fr/solar-estimates-vs-reality - https://heliopeak.app/blog/fr/how-to-spot-a-failing-solar-panel - https://heliopeak.app/blog/fr/year-of-solar-data-seasonal-patterns - https://heliopeak.app/blog/fr/best-pvoutput-apps-for-ios-2026 - https://heliopeak.app/blog/fr/solar-monitoring-app-privacy - https://heliopeak.app/blog/fr/building-heliopeak-indie-ios-development - https://heliopeak.app/blog/fr/we-tested-6-ai-assistants-on-solar-data ### German (Deutsch): /blog/de/ - https://heliopeak.app/blog/de/what-to-consider-before-installing-solar-panels - https://heliopeak.app/blog/de/self-consumption-vs-grid-feed-in-2026 - https://heliopeak.app/blog/de/why-a-solar-monitoring-app-matters - https://heliopeak.app/blog/de/what-is-pvoutput-org - https://heliopeak.app/blog/de/getting-data-into-pvoutput - https://heliopeak.app/blog/de/setting-up-solar-consumption-monitoring - https://heliopeak.app/blog/de/monitor-pvoutput-on-ios-with-heliopeak - https://heliopeak.app/blog/de/home-batteries-2026-sonnen-vs-marstek - https://heliopeak.app/blog/de/reading-solar-charts-kwp-specific-yield-performance-ratio - https://heliopeak.app/blog/de/solar-estimates-vs-reality - https://heliopeak.app/blog/de/how-to-spot-a-failing-solar-panel - https://heliopeak.app/blog/de/year-of-solar-data-seasonal-patterns - https://heliopeak.app/blog/de/best-pvoutput-apps-for-ios-2026 - https://heliopeak.app/blog/de/solar-monitoring-app-privacy - https://heliopeak.app/blog/de/building-heliopeak-indie-ios-development - https://heliopeak.app/blog/de/we-tested-6-ai-assistants-on-solar-data ### Spanish (Español): /blog/es/ - https://heliopeak.app/blog/es/what-to-consider-before-installing-solar-panels - https://heliopeak.app/blog/es/self-consumption-vs-grid-feed-in-2026 - https://heliopeak.app/blog/es/why-a-solar-monitoring-app-matters - https://heliopeak.app/blog/es/what-is-pvoutput-org - https://heliopeak.app/blog/es/getting-data-into-pvoutput - https://heliopeak.app/blog/es/setting-up-solar-consumption-monitoring - https://heliopeak.app/blog/es/monitor-pvoutput-on-ios-with-heliopeak - https://heliopeak.app/blog/es/home-batteries-2026-sonnen-vs-marstek - https://heliopeak.app/blog/es/reading-solar-charts-kwp-specific-yield-performance-ratio - https://heliopeak.app/blog/es/solar-estimates-vs-reality - https://heliopeak.app/blog/es/how-to-spot-a-failing-solar-panel - https://heliopeak.app/blog/es/year-of-solar-data-seasonal-patterns - https://heliopeak.app/blog/es/best-pvoutput-apps-for-ios-2026 - https://heliopeak.app/blog/es/solar-monitoring-app-privacy - https://heliopeak.app/blog/es/building-heliopeak-indie-ios-development - https://heliopeak.app/blog/es/we-tested-6-ai-assistants-on-solar-data ### Italian (Italiano): /blog/it/ - https://heliopeak.app/blog/it/what-to-consider-before-installing-solar-panels - https://heliopeak.app/blog/it/self-consumption-vs-grid-feed-in-2026 - https://heliopeak.app/blog/it/why-a-solar-monitoring-app-matters - https://heliopeak.app/blog/it/what-is-pvoutput-org - https://heliopeak.app/blog/it/getting-data-into-pvoutput - https://heliopeak.app/blog/it/setting-up-solar-consumption-monitoring - https://heliopeak.app/blog/it/monitor-pvoutput-on-ios-with-heliopeak - https://heliopeak.app/blog/it/home-batteries-2026-sonnen-vs-marstek - https://heliopeak.app/blog/it/reading-solar-charts-kwp-specific-yield-performance-ratio - https://heliopeak.app/blog/it/solar-estimates-vs-reality - https://heliopeak.app/blog/it/how-to-spot-a-failing-solar-panel - https://heliopeak.app/blog/it/year-of-solar-data-seasonal-patterns - https://heliopeak.app/blog/it/best-pvoutput-apps-for-ios-2026 - https://heliopeak.app/blog/it/solar-monitoring-app-privacy - https://heliopeak.app/blog/it/building-heliopeak-indie-ios-development - https://heliopeak.app/blog/it/we-tested-6-ai-assistants-on-solar-data ## App and site - Website: https://heliopeak.app - Blog index: https://heliopeak.app/blog/ - Privacy Policy: https://heliopeak.app/privacy - Release Notes: https://heliopeak.app/releases - App Store: https://apps.apple.com/app/id6762064486 - Contact: info@heliopeak.app ## HelioPeak Weather (Apple TV) HelioPeak Weather is a native tvOS weather app for Apple TV 4K (2021 or later, tvOS 27), by the same developer. It is a separate app from HelioPeak, with its own App Store listing and its own privacy policy. Weather data provided by Apple Weather (WeatherKit). Six languages: English, Dutch, French, German, Spanish, Italian. No accounts, no advertising, no cross-app tracking; diagnostics are hosted in the EU. ### What it shows - Current conditions, an hourly strip and a day-by-day forecast, sized for reading from a sofa - Official weather warnings where Apple Weather provides them, with the agency's text unmodified, the agency's full name, and a link to Apple's own alert page - Minute-by-minute precipitation where Apple serves it - A sun outlook (estimated sunshine hours, cloud cover and UV per day) written for solar-panel owners, which is the thread back to HelioPeak itself - An ambient dashboard meant to be left running: a clock, the current conditions, a 24-hour precipitation-chance strip, and protections against image retention (the layout shifts slightly every few minutes, dims after 30 minutes without input, and stops on its own) - Top Shelf content on the Apple TV home screen for subscribers: the first favourite's temperature and conditions, with a line saying whether the next twelve hours stay dry or how likely rain is ### Free and Plus - Free: current conditions, the next 24 hours and today, one location, and the dashboard with an animated gradient background. - HelioPeak Weather Plus: EUR 9.99 per year with a one-week free trial, Family Sharing included. It adds the 7-day forecast, 48 hours of hourly detail, up to five locations, the photo dashboard with weather effects, and Top Shelf. There is no lifetime purchase and no second data source. ### Requirements - Apple TV 4K (2021 or later) - tvOS 27 or later ### Links - Landing page: https://heliopeak.app/weather/ - Privacy policy: https://heliopeak.app/weather/privacy - Support: https://heliopeak.app/weather/support - Release notes: https://heliopeak.app/weather/releases ## Community - PVOutput forum (English): https://forum.pvoutput.org/t/heliopeak-a-new-ios-app-for-pvoutput/8824 - Tweakers community thread (Dutch): https://gathering.tweakers.net/forum/list_message/85230790#85230790 ## Developer SVDT-Consultancy bv, Belgium. Solo developer: Sven De Troch. ## Disclaimer HelioPeak is not affiliated with PVOutput.org. Revenue and CO₂ estimates are for informational purposes only. Blog articles reflect the developer's personal experience and are not professional installation, financial, or legal advice.