Easy Solar Sizer vs Watt

SolarSize helps you estimate the solar panels, inverter and battery you may need for water pumps, farms, container homes, rural houses, small shops and security cameras. Choose your location and use case, get simple offline results, panel direction, tilt guidance and clear safety warnings. No login, no subscription, no internet needed.

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.