Watt - Solar System Calculator

Panels, Batteries & Inverters

Free · Designed for iPad. Not verified for macOS.

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.

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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.

Version 1.4.1

The developer, Abdulrasool Al-Hilo, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Location
    • Contact Info
    • User Content
    • Identifiers

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
Abdulrasool Al-Hilo
Size
58.3 MB
Category
Utilities
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPad
    Requires iPadOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
Languages
English and Arabic
Age Rating
4+
Copyright
© 2026 AbdulRasol Al-Hilo
  • Developer Website
  • Privacy Policy