Solar Calibrator vs Deye ESS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Solar Calibrator
This professional toolkit helps PV installers precisely calibrate panel angles, size battery banks and wire gauges, and generate PDF quotes. It includes tools for obstruction analysis and load auditing, all accessible offline.
- Solar compass and tilt angle calibration
- Battery and inverter sizing
- Wire gauge calculation
- Load audit and quote builder
- PV array and string sizing
- Obstruction analysis
- Offline functionality
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Solar Calibrator is a field toolkit for solar installers and serious DIYers. Set the tilt and direction, size the array, battery bank and cables, check strings and shading, then hand the customer a PDF quote, all from one app. One purchase. No ads, no subscription, no account. TILT ANGLE Lay your phone on the panel and use it as a digital level. Get the best year-round angle for your latitude from published formulas, plus seasonal angles for summer and winter, and which way the panels should face. ORIENTATION A smooth, damped compass that tells you when the array faces the equator: south in the northern hemisphere, north in the southern. PV ARRAY SIZING Enter monthly usage in kWh and the share of the bill you want to offset. Peak sun hours are estimated from your GPS location, so there is nothing to look up. You get system size in kW, number of panels and roof area needed. BATTERY BANK Size off-grid and backup storage from monthly usage, backup hours and system voltage. Lithium or lead-acid, with depth of discharge and efficiency built in. WIRE GAUGE Get the right cable size, in AWG and mm², from current, run length and system voltage, for copper or aluminum. It checks both current capacity and voltage drop, and tells you which one set the size. STRING SIZING Find the maximum panels in series without exceeding the inverter's voltage limit on the coldest morning, using panel Voc and temperature coefficient. Add Vmp and the MPPT minimum to get a full min–max range for hot days too. LOAD AUDIT List appliances with quick-add presets and realistic hours per day to get total daily consumption before you size anything. SHADING CHECK Enter the height of a tree or building and its distance to see whether it will shade the panels at the winter solstice, when the sun is lowest. QUOTES Build a customer quote on site: • Search a catalog of common solar parts or reuse recent items with their last price • Hardware and Other sections, with labor as a fixed amount or a % of hardware • Save quotes and reopen them later • Export a clean, professional PDF named after the customer and date BUILT FOR THE JOB • Every result shows the working behind the number • Export any calculation as a PDF report • Currency set from your region, or choose your own • 7 languages: English, Arabic, Hindi, Urdu, Spanish, French and Uzbek, with full right-to-left support • Dark mode for bright sun and dim attics Results are estimates for planning. Always follow local electrical codes and the equipment manufacturer's specifications.
Deye ESS
Manage your power station equipment throughout its lifecycle with real-time monitoring, efficient O&M features, and smart revenue calculations. Access nationwide electricity prices to optimize operations and maximize ROI.
- Full lifecycle equipment management
- All-in-one O&M with fault diagnosis
- Real-time equipment monitoring
- Smart revenue calculator
- Nationwide electricity price lookup
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【Deye Energy Storage】 is a dedicated application designed for power station equipment management, delivering a smart and scenario-based energy storage experience. Here's what you can expect from the core features: 【Full Lifecycle Management】 Manage your energy storage equipment throughout its entire lifecycle, ensuring professional care and maintenance at every stage. 【Efficient All-in-One O\&M】 Integrates all-in-one operations and maintenance features, including fault diagnosis, performance optimization, and AI-powered maintenance scheduling—empowering you to manage daily operations efficiently while reducing costs. 【Reliable Real-Time Monitoring】 Monitor equipment status in real time with live data streams. Stay informed about system health and performance, ensuring stable operation and quick response to potential issues. 【Smart Revenue Calculator】 Calculate power station revenue on the fly. The built-in tool provides real-time financial analysis based on actual power output and local electricity prices, helping you optimize your strategy and maximize ROI. 【Nationwide Electricity Price Lookup】 Access up-to-date electricity prices across regions in China—anytime, anywhere. Stay ahead of market trends and adjust your operational plans accordingly. We believe the 【Deye Energy Storage】 app will become your trusted assistant in power station management. Download now and start your journey toward smarter, more efficient, and more convenient energy operations.
Screenshots
Verdict
The clearest difference is price: Deye ESS at Free against Solar Calibrator's $9.99. Deye ESS also leads on update cadence (every 11 days vs every 10 months) and iOS requirement (13.0 vs 15.1). On rating, ratings volume, ads and in-app purchases 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
Deye ESS is free to download; Solar Calibrator costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Solar Calibrator against 5.0 for Deye ESS. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
Solar Calibrator ships an update every 10 months, Deye ESS every 11 days. The most recent releases landed on November 12, 2026 and November 8, 2026 respectively.
| Parameter | Solar Calibrator | Deye ESS |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 5.0 (2 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 10 months | Every 11 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.1 | 13.0 — better |
| Further details — not scored | ||
| Size | 40 MB | 103 MB |
| Age rating | 4+ | 17+ |
| Developer | Fawzi Fakhro | 萃绩科技(上海)有限公司 |
Customer experience
Solar Calibrator
Deye ESS
In-app purchases
Solar Calibrator
No in-app purchases
Deye ESS
No in-app purchases
Questions
Is Solar Calibrator free?
Is Deye ESS free?
Which has better reviews, Solar Calibrator or Deye ESS?
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