PV Master vs iEMS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PV Master
This app helps you harness solar energy by providing accurate solar data, weather integration, and tools to optimize your solar panel setup. It offers comprehensive calculators for energy needs, panel requirements, and battery storage, along with guides and a glossary for informed decisions.
- Accurate solar data based on location
- Weather data integration
- Solar potential insights
- Panel positioning tool
- Comprehensive energy calculators
- Guides, FAQs, and glossary
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Thinking about going solar, or trying to get more out of the panels you already have? PV Master turns confusing solar numbers into clear decisions, so you spend less on power and waste less of the sun. Using just your location, PV Master shows you what your roof can really do, when to rely on your own panels, and when to lean on the grid. Whether you are planning your first system or fine tuning an existing one, you get answers you can act on. What PV Master helps you do: Plan with real numbers, not guesses. Get accurate, location based solar data plus a live grid forecast, so you know the best times to use your own power and when cheaper grid power makes sense. Position your panels for maximum output. The built in compass and tilt tool helps you find the angle that captures the most sun all year long. Size your system with confidence. Simple calculators work out how much energy you need, how many panels and batteries it takes, and what it will cost, so you can weigh the ROI before you spend a cent. Get more from every sunny day. Local weather is built in, so you can see how conditions affect production and plan around them. Learn as you go. Clear guides, FAQs, and a plain language glossary explain every solar and photovoltaic term, so nothing holds you back. It all lives in one friendly app, from first idea to finished install, with information that is genuinely easy to read. Download PV Master today and start making smarter, greener energy decisions. Privacy Policy: https://BigBalli.com/privacy Terms of Use: http://www.apple.com/legal/itunes/appstore/dev/stdeula Payment will be charged to your Apple ID at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions in your Account Settings on the App Store after purchase. Any unused portion of a free trial is forfeited when purchasing a subscription. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://BigBalli.com/privacy
iEMS
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Intelligent Energy Management System (iEMS) - Focusing on the new energy fields of photovoltaic and energy storage, it takes efficient and stable monitoring and operation maintenance as the core. By virtue of real-time data analysis and fault prediction, it improves energy output and reduces costs. It provides customized solutions to adapt to multiple scenarios, and helps promote the sustainable prosperity and development of the green energy industry.
Screenshots
Verdict
The clearest difference is in-app purchases: iEMS at none against PV Master's 4. iEMS also leads on iOS requirement (13.0 vs 17.0). PV Master's advantage is update cadence (every 8 days vs every 4 months). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. PV Master sells 4 in-app purchases, starting at $4.99 per month. iEMS asks for nothing beyond the download.
PV Master ships an update every 8 days, iEMS every 4 months. Both last shipped on September 16, 2026.
| Parameter | PV Master | iEMS |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (23 ratings) — better | — |
| Positive reviews | 17.1% of reviews | — |
| Number of ratings | 23 — better | — |
| Update frequency | Every 8 days — better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 25 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | BigBalli Consulting llc | Shenzhen ZTE Software Co., Ltd. |
In-app purchases
PV Master
- Full Unlock$4.991 Month
- Yearly$49.991 Year
- Location Solar Panel Data$0.99
- Lifetime$59.99
iEMS
No in-app purchases





