Off-Grid Solar System Calculator

Daily AC load (kWh/day)kWh/day

Combined running power (W)W

Combined startup demand (W)W

Power running 3+ hours at a stretch (W)W

Enter total startup demand, including other running loads. For loads with no startup surge, enter the running watts again.

• Refrigerator725 WHours/dayRuns 3+ h at a stretch
• Clothes washer500 WHours/dayRuns 3+ h at a stretch
• Clothes dryer (electric)3000 WHours/dayRuns 3+ h at a stretch
• Dishwasher1800 WHours/dayRuns 3+ h at a stretch
• Dehumidifier785 WHours/dayRuns 3+ h at a stretch
• Coffee maker1000 WHours/dayRuns 3+ h at a stretch
• Microwave oven1000 WHours/dayRuns 3+ h at a stretch
• Hair dryer1500 WHours/dayRuns 3+ h at a stretch
• Clothes iron1400 WHours/dayRuns 3+ h at a stretch
• Portable space heater1500 WHours/dayRuns 3+ h at a stretch
• Ceiling fan120 WHours/dayRuns 3+ h at a stretch
• Window fan150 WHours/dayRuns 3+ h at a stretch
• Furnace blower fan750 WHours/dayRuns 3+ h at a stretch
• Whole-house fan500 WHours/dayRuns 3+ h at a stretch
• Laptop50 WHours/dayRuns 3+ h at a stretch
• Desktop computer (tower)120 WHours/dayRuns 3+ h at a stretch
• Computer monitor150 WHours/dayRuns 3+ h at a stretch
• Clock radio10 WHours/dayRuns 3+ h at a stretch
• Stereo / radio200 WHours/dayRuns 3+ h at a stretch
• Electric blanket100 WHours/dayRuns 3+ h at a stretch

Cell or module nominal voltage (V)V

Cell or module capacity (Ah)Ah