# Growatt Off-Peak Planner — With Agile Octopus support!

> Intelligent solar battery charging and monitoring for Growatt systems. (iPhone/iPad app by Marc Haywood.)

- Source: https://appshunter.io/ios/app/growatt-off-peak-planner/id6737279420 (this page in markdown: same URL + `.md`)
- Developer: [Marc Haywood](https://appshunter.io/developer/1775716358)
- Category: Utilities, Productivity
- Price: $4.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 18.6 · 11 MB
- Languages: American English
- Released: 2024-10-30
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/growatt-off-peak-planner/id6737279420/reviews.md

## What is Growatt Off?

This app is not affiliated with or endorsed by Growatt New Energy Technology Limited.

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Intelligently charge your Growatt battery with accurate solar forecasting!

View and control your Growatt battery and inverter system with a new easy to use interface!

Compatible with Growatt SPA, SPH and MIX series inverters. We are always looking to work with volunteers to add compatibility with other models.

Key Features:

• Off-Peak Energy Planning: Maximise your savings and green energy usage by intelligently charging your battery during off-peak hours. The app helps you determine the best charging strategy based on your energy needs and solar generation forecast.

• Accurate Solar Forecasting: Get detailed predictions for solar generation, battery usage, and energy consumption based on current conditions and historical data.

• Solcast compatible: Input a free API key from solcast.com for industry leading solar forecasting.

• Broad compatibility: Compatible with all energy providers and tariffs with a fixed daily off-peak period.

• Further support for Octopus UK's Agile tariff: We can charge your battery during your cheapest time blocks.

• Better UI: Stay informed with a real-time view of your home battery and solar performance with an improved energy dashboard.

• Customisable Alerts: Set reminders for when it's time to make your off-peak energy plan.

• Seamless Integration: Designed to work with Growatt SPA, SPH and MIX systems, ensuring seamless monitoring and control of your solar energy setup.

Growatt Off-Peak Planner empowers you with detailed data on how your solar system performs day-to-day. Avoid unnecessary grid charges, ensure your battery is always charged at the right time, and minimise wasted solar energy. It's not just about savings, it's about making smarter, greener energy choices.

Currently works with Growatt SPA, SPH and MIX inverters. Please contact us if you have a different model - we are looking to support more.

## Key features

- Off-peak energy planning
- Accurate solar forecasting
- Solcast API integration
- Energy provider compatibility
- Octopus UK Agile tariff support
- Improved energy dashboard
- Customizable alerts

## Pricing and in-app purchases

Base price: $4.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Tall Coffee | $1.99 | one-time |
| Grande coffee | $2.99 | one-time |
| Venti Coffee | $4.99 | one-time |
| Short Coffee | $0.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/growatt-off-peak-planner/id6737279420/reviews.md

### 5/5 — Login Issues

*2025-11-06*

Marc guided me through the process of re-installing the app and normal service resumed. The app is great and so is the customer support

**Developer response:** EDIT: I appreciate you updating the review to 5* (I didn’t even have to ask!) Glad to have helped John

### 5/5 — Forecast how much grid power to charge batteries with

*2025-09-13*

Very useful utility if you have a Growatt inverter and batteries. The app reminds you each day to use Solcast to forecast the next day’s solar input to your PV system and recommends the % amount of charge you should put into your batteries in the overnight off peak period. You can opt to take that recommendation, or choose your own % charge and the app will instruct your inverter to set itself for the relevant charge amount. No more guessing what your PV might generate the next day and how much grid electricity you need to consume. Brilliant!!

## Frequently asked questions about Growatt Off

### What Growatt inverters does Off-Peak Planner support?

Off-Peak Planner currently supports Growatt SPA, SPH, and MIX series inverters. The developer is actively seeking volunteers to add compatibility with other models.

### How does Off-Peak Planner help save money?

The app intelligently charges your battery during off-peak hours, maximizing savings and green energy usage. It helps determine the best charging strategy based on your energy needs and solar generation forecast.

### Can Off-Peak Planner forecast solar generation?

Yes, it provides detailed predictions for solar generation, battery usage, and energy consumption. You can input a free API key from solcast.com for industry-leading solar forecasting.

### Is Off-Peak Planner compatible with all energy providers?

The app is compatible with all energy providers and tariffs that have a fixed daily off-peak period. It also offers further support for Octopus UK's Agile tariff, charging your battery during the cheapest time blocks.

### What is the price of Growatt Off-Peak Planner?

Growatt Off-Peak Planner is a paid application priced at $4.99. There are no in-app purchases or subscriptions mentioned.

### Does Growatt Off-Peak Planner have ads?

No, Growatt Off-Peak Planner does not contain advertisements. It is a paid application designed to be ad-free.

### What devices can I use Off-Peak Planner on?

Off-Peak Planner is available for iPhone and iPad devices. It is designed for iOS users.

### How often is Off-Peak Planner updated?

The app was last updated on January 13, 2026, with version 1.38. This indicates a relatively recent update frequency.

## Version history (last 5 releases)

### 1.51 — 2026-06-12

Increased network timeouts slightly.

### 1.50 — 2026-04-29

Improved onboarding.
Changing active mode now lets you set a duration and set a reminder.
The chart in the background is now a bit more useful.
iOS widget icon can now change to indicate the battery is charging.
Homepage background is now dynamic with sun/moon movement and dynamic cloud coverage based on PV generation.

### 1.38 — 2026-01-13

Added option to adjust the scope of the chart on the home screen.

### 1.36 — 2025-11-24

Various improvements.

### 1.35 — 2025-11-05

Improved networking.
Implementation of some glass effects for iOS 26.
Moved some UI around.

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## More apps by Marc Haywood

- [Growatt UX](https://appshunter.io/ios/app/growatt-ux/id6744642104)

All apps by Marc Haywood: https://appshunter.io/developer/1775716358

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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 2026-08-27.*