During an Outage: Plan Essential Backup Loads

During an Outage: Plan Essential Backup Loads

When the power goes out, the goal is not to run every device in the home. The goal is to identify the loads that matter most, confirm their power requirements, and estimate whether a backup power system may support them for the intended outage period.

For many households, refrigeration and communication equipment are among the first loads to consider. A refrigerator may require both continuous operating power and additional startup power when its compressor begins running.

Use the Refrigerator Outage Estimator to create a SealedPick Planning Estimate for:

• Required Continuous Output (W)
• Suggested Minimum Capacity (Wh)
• Estimated Startup Surge (W)

These results are planning estimates only. They are not manufacturer ratings, compatibility guarantees, or guaranteed runtime results.

Start With Essential Loads

Essential loads are the devices a household chooses to prioritize during an outage.

Examples may include:

• a refrigerator;
• a router or modem;
• phone-charging equipment;
• basic lighting;
• medically important equipment;
• selected work or communication devices.

Priorities differ by household, climate, season, outage duration, and personal circumstances. A load plan should identify:

1. Which devices are most important?
2. Which devices need continuous operation?
3. Which devices can run intermittently?
4. Which devices have motors, compressors, or pumps that may require additional startup power?

Reducing optional loads can lower total demand and extend the time available for higher-priority devices.

How to Prioritize Essential Loads During a Multi-Day Outage

The length of an outage changes the planning question. A short outage may be managed with a few essential devices, while a multi-day outage requires a plan for energy use, recharging, and load rotation.

These time ranges are planning scenarios. They do not establish a fixed battery-capacity requirement for every household.

For a shorter outage, start with the loads that protect communication, light, food storage, and immediate safety. A phone, router, small light, and refrigerator may have very different priorities depending on the household.

As the outage extends, review energy use in watt-hours rather than focusing only on a power station’s listed capacity. Reduce loads that are convenient but not essential, and avoid assuming that one battery charge will cover every device for multiple days.

For outages lasting longer than a day, add a recharge plan. Depending on the equipment and conditions, this may include solar input, a safely operated generator used during a charging window, vehicle charging, or another approved power source. Estimate the energy that must be replaced each day, then compare it with the usable recharge input available.

For a multi-day outage, it can also help to rotate loads. Run only the equipment needed during each part of the day, preserve battery reserve for overnight priorities, and reassess the plan as weather, available charging, and household needs change.

For refrigerator-specific planning, see the Refrigerator Outage Estimator. For estimating individual device runtime, see the Portable Power Station Runtime Guide.

Refrigerator Continuous Output

Required Continuous Output is the estimated output that a backup system may need to support the refrigerator while it is operating, together with any additional loads entered into the estimator.

Required Continuous Output
= (refrigerator running watts + additional average load watts)
  × 1.20 planning margin

The result is rounded up to the next 50 W step.

Planning assumption

The 20% sizing margin is a SealedPick Planning Assumption. It is included to provide planning reserve in the estimate. It is not a universal industry standard and does not replace the continuous-output requirement listed by a manufacturer.

Always compare the estimate with the specific backup system’s published continuous output specification.

Refrigerator Startup Surge

A refrigerator compressor may require more power when starting than when running normally.

If a manufacturer-listed or measured startup value is available, that information should be considered more specific than a general estimate.

When a verified startup value is unavailable, the estimator uses:

Estimated Startup Surge
= (refrigerator running watts × 3)
  + additional average load watts

The result is rounded up to the next 50 W step.

Planning assumption

3× startup surge — SealedPick Planning Assumption. This factor is used for preliminary planning when a verified startup value is unavailable.

It is not a universal industry standard, and it does not claim that every refrigerator actually requires three times its running wattage. Actual startup demand depends on the refrigerator, compressor, operating conditions, and electrical system.

The estimated surge should be compared with the backup system’s published surge or peak-output specification.

Battery Capacity and Outage Duration

Output power and stored energy answer different questions.

• Output capability asks whether the system may support the connected load at a given moment.
• Battery capacity asks how much energy may be available over the planned outage period.

The estimator uses the following planning model:

Estimated Energy Need
= [(refrigerator running watts × duty cycle)
   + additional average load watts]
  × outage hours

The capacity estimate is then calculated as:

Suggested Minimum Capacity
= (estimated energy need ÷ 0.85)
  × 1.20 planning margin

The result is shown in watt-hours (Wh).

Planning assumptions

• 85% efficiency — SealedPick Planning Assumption for inverter and conversion losses;
• 20% sizing margin — SealedPick Planning Assumption for planning reserve.

These values are not universal standards, product guarantees, or manufacturer specifications. Actual usable energy may vary because of system design, battery condition, temperature, load behavior, conversion losses, and manufacturer operating limits.

The estimate also depends on the refrigerator’s duty cycle. Actual duty cycle varies by model, temperature, contents, ambient conditions, door openings, and settings.

Additional Loads

If other devices will operate during the outage, include their average power demand in the planning estimate.

• a router;
• phone chargers;
• lighting;
• a small computer;
• other selected essential devices.

Additional loads can affect both the required continuous output and the total energy required over time. Devices with motors, compressors, heating elements, or pumps may also create additional startup demand. If their startup requirements are unknown, the estimate may not fully represent the total instantaneous demand of all connected devices.

For a more realistic plan, decide which devices will operate continuously, occasionally, one at a time, or only when battery capacity allows.

When Reducing Load May Matter More Than Adding Battery Capacity

SealedPick Planning Guidance: During an outage, a larger battery is not always the first planning answer. Reducing high-power or nonessential loads can make a limited backup system more useful for the devices that matter most.

Electric space heaters and electric kettles are important examples. Both use heating elements and can require substantial continuous power while operating. A brief kettle use and an all-night space-heating plan create very different energy demands, but either can use a meaningful share of a small battery system. Compare the appliance’s rated input power with the backup system’s published continuous-output limit before connecting it. Then consider how long the appliance would need to operate.

Small devices also deserve separate planning. A phone charger, LED light, router, or fan may have a much lower power demand than an electric heater or kettle, but their combined energy use still depends on how many devices run and for how long.

Before increasing battery capacity, consider whether part of the household need can be met without electricity. Examples may include adding blankets or layers for warmth, using daylight and battery lights instead of lighting every room, preparing shelf-stable food, or using a manual food-preparation method when appropriate. Follow product instructions and applicable safety guidance for any non-electric heating, cooking, or lighting equipment.

For a limited budget, start by listing the devices that protect immediate safety, communication, food storage, or medically important needs. Estimate their power and operating time first. Then add lower-priority loads only if the planned output and battery capacity allow. This approach does not set a universal minimum capacity; it helps households direct available backup power toward their own highest-priority needs.

How to Read the Estimator Results

Required Continuous Output (W)

This is a SealedPick Planning Estimate of the continuous output that may be needed for the refrigerator and entered additional loads. It is not a manufacturer rating and does not confirm that a specific product will operate the refrigerator.

Suggested Minimum Capacity (Wh)

This is a SealedPick Planning Estimate of the stored energy that may be needed for the selected outage duration and entered loads. It is not a guaranteed runtime result.

Estimated Startup Surge (W)

This is a SealedPick Planning Estimate of possible startup demand based on the estimator’s stated assumption. It is not a measured result unless a separate test is explicitly identified as SealedPick Tested.

Three Types of Information

Information type	Meaning
Manufacturer Specification	A value published by the equipment manufacturer, such as rated output, surge output, input requirements, or operating limits.
SealedPick Planning Estimate	A calculation based on stated inputs and labeled planning assumptions.
SealedPick Tested	A result from a documented SealedPick test using identified equipment, conditions, and methods.

The Refrigerator Outage Estimator provides SealedPick Planning Estimates. It does not create manufacturer specifications and should not be presented as SealedPick Tested.

Household Appliance Compatibility Checklist

How to use the worksheet

1. Record the portable power station’s exact model, published continuous AC output, surge or peak wording, voltage/frequency, and the planned outage period.
2. Complete one row for each intended device using its exact model, rated or running watts, startup information, voltage/connection method, planned hours, and evidence source.
3. Use the status labels to identify whether information is complete, whether professional or manufacturer review is needed, or whether the device should not be connected until an issue is resolved.

A completed worksheet is a planning record, not a universal result. Do not use modified plugs, backfeeding, unapproved parallel connections, temporary wiring, or an unapproved connection method to overcome a mismatch. For refrigerator-specific planning, use the Refrigerator Outage Estimator. For general runtime planning, see the Portable Power Station Runtime Guide.

Using a Generator to Recharge a Battery During a Multi-Day Outage

During a multi-day outage, a battery and a generator can support different parts of the power plan. A generator may provide daytime charging or support higher-demand equipment, while a battery can provide selected loads during quieter periods.

Why a Battery and Generator Can Work Together

One possible planning pattern is:

• use the generator during a daytime charging window;
• recharge the portable power station;
• use the battery for selected overnight loads;
• reduce optional loads when the battery reserve becomes limited.

The exact connection method must follow the instructions for both the generator and the portable power station.

Estimate the Overnight Battery Requirement

First, list the loads that must run from the battery overnight.

For each load, estimate:

Energy use (Wh) ≈ Load power (W) × operating time (hours)

Then add the essential loads together.

Planning Estimate: If selected overnight loads require approximately 600 Wh, the battery plan begins with approximately 600 Wh of energy to replace. Additional allowance may be needed for conversion losses, reserve capacity, battery condition, and uncertainty in the load estimate.

For overnight loads and runtime planning, use the runtime guide. For broader battery capacity planning, review the sizing guide.

Estimate Generator Recharge Time

A simple planning relationship is:

Estimated recharge time ≈ Energy to replace (Wh) ÷ Effective charging power (W)

Effective charging power may be limited by:

• the power station’s maximum AC input;
• the generator’s available output;
• other equipment running at the same time;
• connection and cable limits;
• charging behavior near a high state of charge;
• battery-management and thermal limits.

Illustrative Example: If 600 Wh must be replaced and the effective charging power is assumed to be 300 W:

600 Wh ÷ 300 W ≈ 2 hours

This is a Planning Estimate. Actual charging time may be longer when other loads are operating or charging power changes during the session.

Generator Safety and Connection Boundaries

Portable fuel-burning generators must be operated outdoors in a safe, open location and away from doors, windows, vents, and other openings.

Never operate a portable generator inside a home, garage, basement, shed, crawlspace, or similar enclosed area. Do not connect a generator to household wiring through a wall outlet or improvised backfeed connection.

Follow the generator and power-station manufacturers’ instructions for placement, connection, fuel, wet-weather operation, and maximum output. For refrigerator loads and safety and evidence standards, use the linked SealedPick guides.

Can I Use a Generator to Recharge a Portable Power Station?

It may be possible when the generator output, connection method, and power station AC input are compatible. Check both manufacturers’ instructions before connecting them.

Does a Generator’s Rated Wattage Equal the Power Station’s Charging Wattage?

No. The power station’s AC input may be lower than the generator’s rated output, and other loads can reduce the charging power available.

Should I Run the Generator Overnight?

A plan may use a generator during a daytime window and the battery overnight, but safety, fuel, noise, weather, and local requirements must be considered.

What to Check When Grid Power Returns

SealedPick Planning Guidance: Restoring utility power is a separate step from planning backup capacity. Treat remaining battery charge, observed runtime, and recharge time from one outage as a record for future planning—not as a universal result for every outage or power station.

Confirm the Area Is Safe Before Reconnecting Equipment

Before reconnecting equipment, look for damaged service lines, wet electrical equipment, damaged outlets or cords, burn marks, unusual odors, sparking, or other visible electrical hazards. Stay clear of damaged or downed lines and report them to the utility. If wiring, an outlet, or an appliance appears damaged, do not re-energize it. Contact the utility or a qualified electrician as appropriate.

Do not connect a portable power station or generator to home wiring, a transfer setup, or another power source unless the equipment and connection method are specifically approved for that use. Avoid any arrangement that could backfeed utility lines or create an unapproved parallel connection.

Return Devices to Utility Power One at a Time

When the area is safe and utility service has returned, reconnect or turn on devices one at a time. PG&E recommends turning appliances back on one at a time after conditions return to normal. This makes it easier to notice a problem with a particular appliance, cord, or circuit and avoids adding every household load at once.

Start with the loads that matter most to your household, rather than treating all appliances as equal. Keep manufacturer instructions available for equipment that has a specific restart, reset, or charging process.

Check Refrigerators and Priority Equipment

Confirm that priority loads such as the refrigerator, router, essential lighting, and charging devices have returned to normal operation. For medically important equipment, follow the backup-power requirements provided by its manufacturer, care provider, or service provider.

Check refrigerator temperature and make food-safety decisions using current public-health guidance. For power-planning context and refrigerator load estimates, see the Refrigerator Outage Guide. This link does not replace food-safety guidance for the specific outage.

Recharge and Inspect the Backup Power Station

Recharge the portable power station according to the manufacturer’s instructions. Before storing it, review the battery status, remaining charge, fault indicators, charging cable, input port, and output ports. Do not continue using damaged cables, connectors, or equipment.

If a generator was part of the backup plan, allow it to cool and follow its manufacturer instructions for shutdown, refueling, and storage. Fuel-powered generators belong outdoors during operation and must never be used in enclosed or partially enclosed spaces.

Record What Worked Before the Next Outage

Record which devices were used, how long they ran, any displayed energy-use information, and how the system was recharged. Note whether solar charging, vehicle charging, or a generator charging window contributed to the plan.

Use that record to improve the next outage kit: add or replace needed cables, lighting, batteries, charging options, and other emergency supplies. Actual restoration steps must follow the requirements of the utility, the equipment manufacturer, and a qualified electrician.

Important Planning Limitations

• whether a specific power station is compatible with a refrigerator;
• the actual startup demand of a specific compressor;
• the exact runtime during a real outage;
• whether a system will operate safely outside manufacturer limits;
• whether a medically important device will function correctly;
• whether a connection method is approved for a particular installation.

Before using backup power, check the refrigerator’s voltage and frequency requirements, running and startup specifications, the backup system’s continuous and surge-output ratings, approved connection methods, manufacturer operating instructions, and environmental and temperature limits.

Do not connect a backup source to household wiring in a way that can backfeed the electrical system. Follow applicable safety guidance and manufacturer instructions.

For connection and operating procedures, see How to Power a Refrigerator During a Power Outage.

For capacity and runtime planning, use the Refrigerator Outage Guide.

What This Scenario Does Not Do

• recommend a specific product;
• verify a brand or model;
• provide prices;
• claim hands-on testing;
• guarantee runtime;
• guarantee refrigerator compatibility;
• replace manufacturer documentation or professional advice.

It helps users organize essential loads and create a transparent planning estimate before making a purchasing or backup-power decision.

FAQ

How Should I Plan Essential Loads for a Multi-Day Outage?

Start with immediate safety, communication, lighting, and food-storage needs. As the outage continues, reduce optional loads, estimate daily watt-hour use, and create a recharge or load-rotation plan. The right approach depends on the household, weather, available charging sources, and the equipment’s manufacturer specifications.

Sources

• FEMA emergency preparedness resources
• Ready.gov Power Outages
• PG&E Natural Disaster Recovery
• Appliance manufacturer documentation
• Portable power station manufacturer specifications

Related Reading

• Refrigerator Outage Guide
• How to Power a Refrigerator During a Power Outage
• How to Calculate Portable Power Station Runtime
• How We Choose