SolarCalculator4U.com
Smart Solar Power Estimator
Instantly calculate your daily household electricity consumption and get your recommended solar system size in kW, number of 550W panels, inverter capacity, and battery backup storage — 100% free, no sign-up required.
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Click items in the grid above to add them to your solar estimation plan.
Store excess solar energy for use during night-time or power outages.
Add appliances to view load breakdown chart.
Follow these three steps to accurately size your solar power system for home or business use.
Before purchasing solar panels, you must know your actual daily consumption in kilowatt-hours (kWh). Our solar panel calculator allows you to input exact quantities, power ratings (Watts), and daily operating hours for fans, LED lights, air conditioners, and kitchen appliances.
(Watts × Qty × Hours) ÷ 1000 = kWh per dayGrouping appliances gives your total daily and monthly utility footprint.
System size in kW depends on average daily sun hours and efficiency losses. Average global locations receive between 4.0 to 6.0 peak sun hours per day. We assume a standard 5.0 peak sun hours with an 80% system efficiency factor.
Daily kWh ÷ (Peak Sun Hours × 0.8) = Solar kW SizeWe automatically round up to align with whole numbers of modern 550W modules.
Inverters convert DC solar panel power to AC home power. We apply a 20% safety headroom above the system size. For energy storage, we calculate backup requirements during night-time or power outages based on your backup hours target.
Lithium: 85% DoD • Lead-Acid: 50% DoDLead-acid batteries must align with series voltage connection multiples (4× for 48V systems).