Interactive battery tool

Energy Consumption Calculator

Estimate monthly, daily, and annual electricity demand from utility bills and major household load categories.

Methodology

How this calculator works

The estimate compares bill-derived monthly consumption with major usage categories such as appliances, heating or cooling, and lighting.
The calculator uses your electricity rate to convert the monthly bill into estimated kilowatt-hours.
Seasonal loads, electric vehicle charging, heat pumps, and planned efficiency upgrades should be reflected before requesting quotes.

Bill-derived kWh = monthly electric bill / electricity rate.
Modeled kWh combines major appliances, cooling or heating, lighting, occupants, and miscellaneous load assumptions.
The planning baseline uses the higher estimate so incomplete appliance inputs do not understate real usage.

Monthly bill: Your average electric bill. Use several months if your home has strong seasonal cooling or heating swings.
Electricity rate: The price you pay per kilowatt-hour. This converts bill cost into estimated energy use.
Occupants: A household-size input used to sense-check whether the estimate is unusually low or high.
Load categories: Major usage buckets such as appliances, cooling, heating, lighting, electric vehicles, and always-on devices.

Now that you have a monthly usage baseline, estimate the battery storage capacity you need to back up your critical loads.

Review the buying guide to understand how energy consumption affects battery sizing, backup runtime, and system cost estimates.

How this calculator works

The estimate compares bill-derived monthly consumption with major usage categories such as appliances, heating or cooling, and lighting.
The calculator uses your electricity rate to convert the monthly bill into estimated kilowatt-hours.
Seasonal loads, electric vehicle charging, heat pumps, and planned efficiency upgrades should be reflected before requesting quotes.

Bill-derived kWh = monthly electric bill / electricity rate.
Modeled kWh combines major appliances, cooling or heating, lighting, occupants, and miscellaneous load assumptions.
The planning baseline uses the higher estimate so incomplete appliance inputs do not understate real usage.

Monthly bill: Your average electric bill. Use several months if your home has strong seasonal cooling or heating swings.
Electricity rate: The price you pay per kilowatt-hour. This converts bill cost into estimated energy use.
Occupants: A household-size input used to sense-check whether the estimate is unusually low or high.
Load categories: Major usage buckets such as appliances, cooling, heating, lighting, electric vehicles, and always-on devices.

Now that you have a monthly usage baseline, estimate the battery storage capacity you need to back up your critical loads.

Review the buying guide to understand how energy consumption affects battery sizing, backup runtime, and system cost estimates.