Load Calculator
Interactive load calculator pre-populated with sample appliances for a typical 3-bedroom home. Adjust values with sliders.
This calculator uses sample data. Purchase a session to calculate loads with your real address and appliances.
Load Calculator
Add your appliances, adjust the sliders, and see your solar system requirements update in real time.
kWh/m²/day — Peak Sun Hours for solar panel sizing
Monthly Solar Radiation
Combined Load
3.0 kW
All appliances running
Peak Surge
7.0 kW
Worst-case startup
Daily Energy
7.9 kWh
annual usage
Solar Harvest
110.0 kWh
4.4 kW system
Daily Deficit
0 Wh
Self-sufficient!
Battery Needed
0 Wh
1 day autonomy + 20%
Minimum Inverter Size
Your inverter must handle at least 8.7 kW (peak surge + 25% safety margin). An undersized inverter will trip when motor loads start.
System Sizing Summary
Inverter / Charger
Peak surge + 25% safety margin
8.7 kVA minimum
Battery Bank
1 day autonomy + 20% safety margin
0.0 kWh minimum
Daily Production Target
Total energy consumption
7.9 kWh/day
These are minimum sizing recommendations with safety margins applied. Actual component selection should account for temperature derating, depth of discharge limits, and future expansion.
Your Appliances
8 appliancesRefrigerator (18 cu ft)
150 W rated · 600 W surge
Daily energy: 2.4 kWh
Window AC Unit (8,000 BTU)
800 W rated · 2.4 kW surge
Daily energy: 2.4 kWh
LED Lighting (whole house)
200 W rated · 200 W surge
Daily energy: 720 Wh
55" LED TV
120 W rated · 120 W surge
Daily energy: 320 Wh
Washing Machine
500 W rated · 2.0 kW surge
Daily energy: 400 Wh
Microwave Oven (1100W)
1.1 kW rated · 1.5 kW surge
Daily energy: 550 Wh
WiFi Router + Modem
30 W rated · 30 W surge
Daily energy: 600 Wh
Laptop Charger
65 W rated · 65 W surge
Daily energy: 540 Wh