Empowering Clean Energy Decisions
An independent digital toolkit engineered to simplify solar panel sizing, battery storage requirements, and return on investment calculations.
Our Mission & Purpose
Transitioning to solar power is one of the most effective ways for homeowners and businesses to lower electricity bills and reduce carbon emissions. However, sizing a solar photovoltaic (PV) array or battery storage system can feel overwhelming without clear calculations.
Many consumers rely solely on installer sales quotes, often lacking an independent benchmark for panel sizing, annual kWh generation, or realistic payback timelines.
ExpertSolarCalc was created to eliminate guesswork. We provide free, browser-based solar calculators built on verified photovoltaic equations and standard solar irradiance metrics.
Verified Calculation Standards
Our calculators incorporate industry standard formulas used by renewable energy engineers:
- Peak Sun Hours (PSH): Solar generation calculations utilize local peak sun hours and array derate factors (temperature loss, inverter efficiency, wiring losses).
- Battery Depth of Discharge (DoD): Battery sizing accounts for usable capacity standards (Lithium-ion ~80-90% DoD, Lead-Acid ~50% DoD) to protect battery lifespan.
- DC Cable Voltage Drop: Solar DC cable sizing strictly follows Ohm's law and standard voltage drop limits (under 2% target loss).
Our Guiding Principles
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100% Privacy by Design
All calculations execute locally inside your web browser using JavaScript. We do not collect, transmit, or store any of your energy usage figures or financial numbers.
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No Gated Content or Paywalls
All tools are 100% free with no email registration, account creation, or hidden fees. Get instant results without sales follow-up calls.
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Transparency & Neutrality
We are an independent calculation platform. We do not sell solar panels or endorse specific installer brands. Read our full Financial Disclaimer.