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Volcast - Solar Forecast

Volcast - Solar Forecast

by Michal Bartosiak

0 ratings
2 reviews
🔧 Utilities
☀️ Weather
Free
In-App Purchases

Details

  • Released
  • Updated
  • March 24, 2026
  • September 10, 2026

Features

Developer

Michal Bartosiak
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About

Get precise, hour-by-hour solar production forecasts for up to 7 days. Optimize your energy usage by aligning tasks with peak solar availability and integrate with smart home systems. Features advanced physics-based modeling and AI calibration for accurate predictions.

✓7-day hour-by-hour solar forecast
✓Smart home integration (Home Assistant API)
✓Advanced physics-based modeling
✓AI auto-calibration
✓Multi-string and bifacial panel support
✓Notification Center alerts
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What's New in Volcast

1.6.0

September 10, 2026

• Config Doctor: the app checks your panel and inverter settings for common mistakes and suggests fixes. • Forecast model update, rolling out gradually over the coming days: better morning and afternoon shape. Calibration re-learns over a few days. • API key: "Share key" sends the full key to the computer running Home Assistant. • Home Assistant integration 1.7.1: instant feedback on an incomplete key, production sync that survives HA restarts. Changelog: volcast.app/changelog

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Subscriptions & In-App Purchases

Volcast Premium · Monthly

7-day forecast, calibration, alerts & API

$4.991 Month
7 Days trial
How to cancel Volcast subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

Great Solar Forecast app

Best solar forecast app I have found.

Allows multiple panel strings that face different directions which none of the others allow.

Better it integrates live with Home Assistant which feeds back “actual” PV production and allows the app to automatically refine and improve its forecasting.

Probably the best part is it’s 100% setup on your phone no website logins required

Having your solar forecast on your phone is great and allows household planning for running your solar / battery system, lets you plan solar surpluses EV charging

Nice app 👍
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RussellauRussellau

Brilliant for Forecasting

Honestly, this is exactly the app I’ve been looking for to check my solar forecast.

It’s clear, easy to use and has a bunch of features. The fact that it learns from your previous production and adjusts the forecast is an absolute game changer!

Bonus points for the Home Assistant integration too!
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AshGSmithAshGSmith

FAQ

What is Volcast's free forecast accuracy?

The free version of Volcast provides a high-accuracy solar production forecast for 48 hours. This allows users to plan their immediate energy needs effectively.

What are the benefits of Volcast Premium?

Volcast Premium offers a full 7-day forecast, advanced AI calibration for personalized system performance learning, and access to the Home Assistant API for smart home integration. A 7-day free trial is available.

How does Volcast handle different solar panel setups?

Volcast supports multi-string configurations, ideal for complex east-west or multi-roof systems, and specialized modeling for bifacial panels. This ensures accurate forecasts regardless of your system's complexity.

Does Volcast have ads?

No, Volcast is privacy-first and does not contain advertisements. It ensures secure processing without ads or third-party tracking.

How often is Volcast updated?

The app was last updated on June 13, 2026, with version 1.4.2. This indicates a consistent development cycle for improving features and accuracy.

What devices is Volcast available on?

Volcast is available on iPhone, iPad, and iPod, making it accessible to a wide range of Apple users with solar installations.

How can I cancel my Volcast Premium subscription?

Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current period. You can manage your subscriptions directly within your App Store account settings.

What kind of alerts does Volcast offer?

Volcast's Notification Center can provide evening forecasts, snow warnings, and alerts for peak solar production windows, helping you stay informed and optimize energy usage.