# Solar ROI — Calculates ROI of Solar Panels > Calculates the payback period and ROI for solar panel investments. (iPhone/iPad app by Sander Haanappel.) - Source: https://appshunter.io/ios/app/solar-roi/id944264541 (this page in markdown: same URL + `.md`) - Developer: [Sander Haanappel](https://appshunter.io/developer/603940914) - Category: Productivity, Utilities - Price: Free with in-app purchases - Rating: 4.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 8.0 · 71 MB - Languages: Dutch, English - Released: 2014-12-21 - Data updated: 2026-06-24 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/solar-roi/id944264541/reviews.md ## What is Solar ROI? Solar ROI is the first free independent tool, which calculates the payback period of solar panels without commercial involvement. R.O.I. stands for the term return on investment. ROI = income per year / investment With Solar ROI you can compare tenders and the higher the ROI, the sooner you have recouped your investment. However, the payback time in years is dependent on several factors. In a project, you should compare the result with the situation while you are doing nothing. If you would not buy solar panels, would you leave your money on the bank and receive interest or will you spend it for something else? In the first case, you may also have to take in account the property tax, which you have to pay in some countries. Or would you rather take an additional hypothec on your house to fund your solar panels. In some countries, you may deduct the interest from income tax. The first choice you have to make in the App is whether you will invest as an individual or as a company. The next choice is whether you fund your investment through savings or are you going to invest through a hypothec or loan. The app instantly calculates ROI with some default values for savings, hypothec or loan, but you can change the settings for 'Savings', 'Hypothec' and 'Loan'. Then enter the required budget. You can request estimates from suppliers of solar panels.. The results can be shown in a table or a graph. The tool is not a black box and all calculations are displayed in datasheets and graphs. ## Key features - Calculates solar panel ROI - Compares tenders and funding options - Displays results in tables and graphs - Allows customization of savings, hypothec, and loan settings - Supports individual and company investments ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Solar ROI Full-Version | $2.99 | one-time | ## Frequently asked questions about Solar ROI ### What is Solar ROI? Solar ROI is a free, independent tool designed to calculate the payback period and return on investment for solar panel installations without commercial bias. It helps users compare different investment scenarios and funding methods. ### How does Solar ROI calculate ROI? The app calculates ROI using the formula: income per year divided by investment. It considers various factors like funding through savings, hypothecs, or loans, and allows users to input specific budget details for accurate projections. ### Can I compare different solar panel offers with Solar ROI? Yes, Solar ROI allows you to compare tenders by calculating the ROI for each. A higher ROI indicates a quicker recouping of your initial investment, helping you make informed decisions. ### What funding options can I analyze with Solar ROI? Solar ROI supports analysis for investments funded through savings, hypothecs, or loans. You can adjust settings for each of these to see how they impact your overall return on investment. ### Does Solar ROI show the calculation details? Yes, the app is transparent about its calculations. All results are displayed in datasheets and graphs, so the tool is not a black box and you can see how the ROI is derived. ### What devices is Solar ROI available on? Solar ROI is available on iPhone, iPad, and iPod. It is designed for iOS devices. ### How often is Solar ROI updated? The latest version of Solar ROI is 2.1, which was last updated on March 29, 2018. Future updates may be released to improve functionality or add new features. ### What is the age rating for Solar ROI? Solar ROI has an age rating of 4+, making it suitable for users of all ages. This indicates it contains no mature content. ## Version history (last 5 releases) ### 2.1 — 2018-03-29 This app has been updated by Apple to display the Apple Watch app icon. Bug in loading the PDF for iOS 11 solved. ### 2.0 — 2017-12-12 The PDF report didn’t generate in iOS11. This is issue is solved in this version and the screens have been modified for use on the iPhone X. ### 1.4 — 2015-10-16 On the start screen 'Payback time' and in the side menu, the 'PDF' option is added. The type of reporting depends on the choice of the type of financing (Private or Business) and the funding (by savings, hypothec or loan). After making those choices and the input of the other fields, the results can be displayed as a PDF and send by mail. You can also send the mail to yourself and save the attachment on a PC or print the PDF. ### 1.3 — 2015-03-30 The lifespan of the inverter is now also included in the table and graphs of the hypothec and the loan and a change is realized to fit 25 rows in the table 'Savings' on one screen of the iPad without scrolling. ### 1.2 — 2015-02-16 Two extra fields are added to calculate the savings over 25 years: - Lifespan of inverter after commissioning - Required budget for replacement inverter There is a chance that the inverter will be broken within 25 years. 15 years is filled in as the standard value for the replacement of the inverter after commissioning. The hypothesis is that you buy a new inverter and finance this from your own capital (and therefore this does not affect the screens with the datasheets 'hypothec' and 'loan'). In the datasheet 'Savings' the row of the year after the replacement will be displayed in a different color. ## Apps similar to Solar ROI | App | Rating | Price | Category | | --- | --- | --- | --- | | [AHAsolar One](https://appshunter.io/ios/app/ahasolar-one/id1345910438) | — | Free | Productivity | | [My Solar Energy](https://appshunter.io/ios/app/my-solar-energy/id722405815) | 1.0 (1) | Free | Productivity | | [My Solar Panel](https://appshunter.io/ios/app/my-solar-panel/id1498356619) | 4.6 (108) | Free | Productivity | | [Grace Solar](https://appshunter.io/ios/app/grace-solar/id1489691070) | — | Free | Productivity | | [PV Solar Forecast](https://appshunter.io/ios/app/pv-solar-forecast/id1496274910) | 4.1 (34) | Free | Productivity | | [PV Go](https://appshunter.io/ios/app/pv-go/id1296191020) | — | Free | Productivity | ## More apps by Sander Haanappel - [Solar Consult](https://appshunter.io/ios/app/solar-consult/id603978781) - [Solar Consult Pro](https://appshunter.io/ios/app/solar-consult-pro/id603985129) All apps by Sander Haanappel: https://appshunter.io/developer/603940914 --- *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 2026-06-24.*