☀️ Solar System Calculator — Free Tool for Solar Panel, Battery & Load Sizing

Welcome to the Solar System Calculator — designed specifically for homes and small businesses. Enter your appliances, and we’ll calculate the solar panel size, battery capacity (Ah), and daily energy needs based on sun hours. Perfect for off-grid, hybrid, or backup solar systems.

🔌 Step 1: Enter Your Electrical Loads

💡 Tip: Check appliance labels or Google “device wattage” (e.g., “electric fan wattage PH”)

Appliance Name

Power (Watts)

Usage per Day (Hours)

Appliance Name

Power (Watts)

Usage per Day (Hours)

🔋 Step 2: System Voltage (V)

🌤️ Step 3: Average Peak Sun Hours per Day (4–5.5)

⚡ Step 4: Days of Autonomy (Battery Backup)

🔄 Step 5: Inverter Efficiency (%)

📉 Step 6: Battery Depth of Discharge (DoD %)

📊 Results

Total Daily Energy: - Wh

Required Solar Panel Size: - W

Required Battery Capacity: - Ah

💡 Note: This calculator provides estimates. Always consult a professional for real installations. Assumes 85% charge controller efficiency.

📍 Designed for all conditions — adjust sun hours based on your region.