For the registered base schedule, plan on 3.3 kWh of energy each day and 9.89 kWh over 72 h across the 72-hour planning period. The highest scheduled demand is 1,500 W. Under this scenario's headroom policy, that produces a planning running target of 1,875 W. The one-motor-start estimate is 2,300 W.
The decisive power constraint occurs at 07:00, when the scheduled loads are Coffee maker 1,130 W, Refrigerator 200 W, Chest freezer 150 W, Wi-Fi router + modem 20 W. This overlap—not the sum of every listed appliance—is the relevant base-case constraint. If every enabled AC load ran at once, the total would be 2,688 W, but the registered schedule does not call for that condition.
These are demand and energy targets, not confirmation that a particular generator can run the plan. No generator running or surge rating has been entered. The estimate also does not establish fuel runtime, continuous source coverage, or support for two motors starting together.
Build your home backup schedule
Use the planner in this order:
- Separate essential and optional loads. The default plan treats the refrigerator and chest freezer as critical. Lights, phone charging, the router and modem, coffee maker, and microwave are important. The laptop is a comfort load. Change these priorities to match your household; they are editable defaults, not universal recommendations.
- Enter actual appliance ratings. Look for a nameplate on the back, side, underside, door frame, motor housing, or power adapter. Enter running watts and, when available, starting or surge watts. If a rating is missing, keep it unknown and check the manual or manufacturer information rather than entering zero. If the label gives only volts and amps, use a supported conversion tool or obtain the watt rating instead of guessing.
- Set daily operating times. Schedule appliances for when they need to operate. Refrigeration may cycle throughout the day, while cooking and charging can often be assigned to specific operating windows.
- Mark which loads must run together. The schedule—not the total of every appliance in the list—determines the expected on-power envelope. Pay particular attention to kitchen appliances overlapping with refrigerators, freezers, pumps, or furnace blowers.
- Set the outage length and source windows. The reference case repeats one editorial planning day over 72 hours. Edit the horizon for the expected 1–7 day outage and enter when the generator or other source will be available. The current reference result is still a demand estimate; it does not validate chronological source coverage.
- Add battery support only when its specifications are available. Enter usable capacity in Wh, inverter rating, charge limit, initial and minimum state of charge, charging windows, and applicable efficiency assumptions. Without these inputs, battery runtime, recharge sufficiency, and state of charge cannot be calculated.
- Recalculate after every meaningful change. Shortening an appliance schedule may reduce energy, while moving it may reduce peak demand if the edit removes an overlap. Use the recalculated result rather than estimating the numerical effect yourself.
What determines whether the plan works
A home backup plan must address two different requirements:
- Power, measured in watts (W), is demand at a particular moment. The generator or inverter must support the loads that overlap, including applicable motor-starting demand.
- Energy, measured in watt-hours (Wh) or kilowatt-hours (kWh), is power accumulated over time. Fuel availability, generator operating hours, and battery capacity affect how long a schedule can be maintained.
The base plan's scheduled peak is 1,500 W. We apply the registered scenario policy to produce 1,875 W as the planning running target. That headroom policy belongs to this scenario; it is not a universal generator-loading rule.
Starting demand is a separate check. At 07:00, scheduled loads already total 1,500 W, and the modeled event is: Refrigerator adds 800 W while starting. This produces the 2,300 W estimate. It assumes one motor starts at a time and does not show what happens if the refrigerator and another motor start together.
A source can meet the momentary power target yet still lack enough fuel or stored energy for the outage. Conversely, sufficient total energy does not help if the generator or inverter cannot support the largest scheduled overlap or startup event.
What to change when power is limited
If the available source cannot support the plan, match the change to the constraint:
- For excessive running watts, reduce overlap first. Move the coffee maker or microwave to a time when other deferrable loads are off. Changing run time lowers the peak only when it removes an overlap.
- For excessive starting demand, stagger motor loads. Avoid intentionally starting a pump, refrigerator, freezer, or blower at the same time. Automatic cycling can still create an overlap, so a one-motor-start estimate is not proof that coincident starts are supported.
- For excessive daily energy, shorten operation. Reduce lighting hours, charging time, computer use, or other deferrable use while preserving the loads you marked critical.
- Defer comfort loads. In the reference plan, the laptop is the first optional load to remove. Your priorities may differ.
- Schedule short, high-power tasks deliberately. Coffee making and microwave use are easier to accommodate when they take turns rather than overlap.
- Recalculate the edited schedule. These changes show useful directions, but their numerical effects depend on the revised times and ratings.
Electric space heating and air conditioning are outside this reference plan. Adding either can materially change both running-power and energy requirements.
Lean, higher-demand, small-home, and rural-home variations
| Registered case | Daily energy | Energy over 72 hours | Scheduled peak | Planning running target | Starting estimate |
|---|---|---|---|---|---|
| Lean | 2.67 kWh | 8 kWh over 72 h | 1,500 W | 1,875 W | 2,300 W |
| Base | 3.3 kWh | 9.89 kWh over 72 h | 1,500 W | 1,875 W | 2,300 W |
| Higher demand | 3.85 kWh | 11.56 kWh over 72 h | 1,500 W | 1,875 W | 2,300 W |
These are separately registered plans with several input differences. They show results for three complete schedules; they do not isolate the effect of changing one appliance or one operating time.
For a smaller home: Start with the appliances actually present. Remove absent loads, revise quantities such as the number of bulbs and chargers, and enter the real schedule. A separate generic “Home essentials” preset is not a smaller version of this plan and should not be substituted without comparing its actual load list.
For a rural home with a well pump: The base plan contains no well pump. Add the actual pump using its voltage, running rating, starting information, and required operating schedule. Generic well-pump records in the secondary 2,000 W capacity check require startup and/or 120/240 V verification, so wattage alone does not establish compatibility. That check uses generic records and does not certify this complete home-backup schedule or any particular generator.
Checks the planner cannot complete yet
The reference result is a demand estimate based on an editorial schedule, not measured household consumption or validated electrical dispatch. One specified day is repeated over the 72-hour horizon as a planning simplification.
The following checks remain unresolved:
- Generator running capacity: Unknown because no running or continuous watt rating has been entered.
- Generator startup capacity: Unknown because no surge or starting watt rating has been entered.
- Voltage and connection compatibility: Unknown because the source voltage and connector configuration are not defined. This is especially important for equipment that may require 240 V, including many well pumps.
- Battery operation: Not configured in the current base case. There are no battery, inverter, charger, capacity, state-of-charge, loss, or charging-limit inputs, so battery runtime and recharge behavior are not calculated.
- Fuel and runtime: Not calculated. The plan does not establish fuel consumption, refueling frequency, or runtime from a tank or fuel quantity.
- Chronological source coverage: Not validated. The displayed demand schedule does not prove continuous autonomy, adequate recharging, or an optimal dispatch strategy.
- Multiple simultaneous starts: Not checked. The startup estimate models one motor starting at a time.
The planner also does not validate transfer equipment, permanent wiring, or service-panel work. Use appropriate listed equipment and qualified electrical guidance for a permanent generator connection.
Next: enter your actual ratings and schedule
Before relying on the plan, collect these details:
- Generator running or continuous watts
- Generator starting, surge, or peak watts
- Available 120 V or 120/240 V outlets and each appliance's required voltage
- Appliance running watts or amps
- Motor starting watts, surge current, or locked-rotor information, when listed
- The hours each appliance must operate and which loads must run together
- For battery support, usable capacity in Wh, inverter rating, charge limit, state-of-charge limits, efficiency assumptions, and charging windows
Enter ratings exactly as labeled, and keep missing values unknown rather than entering zero. Then recalculate. Compare the source's running rating with the planning running target, its surge rating with the starting estimate, and its voltage and outlet configuration with the connected equipment.
For critical medical needs or other life-safety loads, do not treat this general planning scenario as an adequacy determination.