To know what size solar system do I need for my bill, divide your average monthly cost by your local utility electricity rate per kWh to find your monthly energy consumption. Then, divide your daily consumption by your local peak sun hours and adjust for standard system efficiency drops (0.82). System Size (kW) = (Monthly…
To find out how many solar panels do I need, multiply your target system size in kilowatts (kW) by 1,000 to convert to watts, then divide by the wattage rating of your individual panels. Most US homes need between 15 and 30 panels to offset 100% of their utility bills. Panel Count = (Target kW…
To determine how many kW solar system do I need, divide your home’s total annual electricity consumption (in kWh) by your local geographic peak sun hours, divide by 365 days, and divide by an environmental efficiency loss factor (typically 0.80 to 0.84). System Size (kW) = (Annual kWh ÷ 365) ÷ Daily Peak Sun Hours…
Legal & Financial Disclaimer: The calculators, tools, and content provided on this website are for educational and informational purposes only and do not constitute financial, legal, or tax advice. All calculations are estimates based on user-provided inputs and national averages, and do not guarantee actual solar production, financial savings, or installation costs. State incentives, federal tax credits (such as Section 25D), net metering policies, and utility rates are subject to change. We strongly recommend consulting with a certified solar professional and a licensed tax advisor before making any purchasing or financial decisions.