# Watt - Solar System Calculator — Panels, Batteries & Inverters

> Panels, Batteries & Inverters (iPhone/iPad app by Abdulrasool Al-Hilo.)

- Source: https://appshunter.io/ios/app/watt-solar-system-calculator/id6820459639 (this page in markdown: same URL + `.md`)
- Developer: [Abdulrasool Al-Hilo](https://appshunter.io/developer/6820459641)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 64 MB
- Languages: American English, Arabic
- Released: 2026-10-15
- Data updated: 2026-10-24

## What is Watt?

Don't overpay for a system bigger than you need — or buy one that dies at night.
Watt sizes your solar system step by step: enter your appliances and outage hours, and get the right number of panels, battery capacity and inverter size.

HOME CALCULATOR
• Quick mode: an estimate in a minute from your average usage.
• Detailed mode: add each appliance (AC, fridge, water pump…) and its hours.
• Accounts for grid hours, generator and outage schedule.
• Hybrid, off-grid and on-grid; single- and three-phase.

TOOLS FOR INSTALLERS
• Panel and battery calculators (lithium and gel).
• Inverter sizing for your loads.
• AC/DC cable gauge by current and distance.
• Solar water pump sizing.
• Best tilt and orientation for your location, with a compass.

ROOF DESIGNER
• Draw your roof and lay out panels, with shading and obstacles.
• Monthly production estimate from solar irradiance data for your location.
• Mounting structure design with a dimensioned drawing.
• Export a PDF report to share with your installer.

OFFERS & INSTALLERS (Iraq)
• Request quotes and compare offers from installation companies.
• Browse brands and products.

Fully bilingual: Arabic and English.

Note: results are estimates for planning. Electrical installation must be done by a qualified technician.

## Is Watt safe?

Not enough ratings yet to assess Watt.

## Is Watt legit?

Watt - Solar System Calculator has limited verification signals. The AppsHunter Legitimacy Score for Watt is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 1.5.0 — 2026-10-23

What's new in 1.5:
• More accurate sizing: your system is designed from your real location (PVGIS sun data, with a NASA backup), with the best tilt and direction calculated automatically.
• Outage analysis: see how long your system lasts on sun and battery, with a clearer battery chart.
• Costs and prices for your own country and currency.
• Notification settings you control.
• Store and order improvements, plus general fixes.

### 1.4.1 — 2026-10-16

What's New in Version 1.4.1:
Account & Usability Improvements:
• Background profile and permissions sync, plus pull-to-refresh on your profile page.
• One-tap WhatsApp reminder buttons on order notifications for fast buyer-seller communication.
• Added "Forgot Password" and streamlined email/password sign-in and registration.
• Helpful reminders to complete location details and commercial verification.

### 1.4 — 2026-10-15

No release notes.

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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 2026-10-24.*