What Size Power Station Do I Need for a House?

Research-based, not lab-tested. Read our research method and match the documented requirements to your household before purchasing.

Start with selected loads

For a house, the useful question is which appliances must run and for how long. A battery that supports phones and a few lights may be useful without supporting a refrigerator, pump or central air conditioner. House area does not establish those electrical requirements.

This worksheet is research-based, not lab-tested. It calculates a planning scenario; it does not assess your wiring or guarantee product runtime. The Virginia Tech energy-use guide explains energy calculations and why appliance duty cycles matter.

Static capacity calculator: fill in your own values

There is no new interactive script. Copy these steps to paper or a spreadsheet, or print the page from your browser.

1. For each device, record its voltage and average input watts while operating.
2. Multiply average watts by the hours required. Add the results to get delivered energy in watt-hours (Wh).
3. Choose an explicit usable-energy fraction to account for conversion and standby losses.
4. Choose the fraction of usable energy you will keep in reserve.
5. Divide delivered Wh by both fractions: rated capacity = delivered Wh ÷ [usable fraction × (1 − reserve fraction)].

Use measured or documented energy for your own appliances. A nameplate maximum is not necessarily a refrigerator’s average draw, and a utility bill includes loads you may disconnect during an outage. Measure plug-in devices safely during normal use or consult their manufacturer. Do not open an electrical panel to fill in this table.

Worked example: selected household essentials

Every load and duration below is hypothetical. The assumed 80% usable-energy fraction and 20% reserve are planning choices, not a manufacturer’s efficiency claim or measured household profile.

Hypothetical load	Assumed average watts	Hours	Delivered energy
Refrigerator, cycle-averaged	60W	12	720Wh
Router and modem together	15W	12	180Wh
LED lighting together	10W	5	50Wh
Phone charging session	10W	2	20Wh
Total			970Wh

The arithmetic is 970 ÷ (0.8 × 0.8) = 1,515.625Wh, or about 1,516Wh rated capacity under these assumptions. Round up to a suitable available capacity and still complete the electrical checks below. A unit near that threshold may fail your real scenario if your appliance draw or losses are higher.

See how duration changes the budget

The same formula, with the same hypothetical loss and reserve assumptions:

Average combined load	Duration	Delivered Wh	Calculated rated Wh, rounded up
50W	8 hours	400Wh	625Wh
100W	8 hours	800Wh	1,250Wh
100W	16 hours	1,600Wh	2,500Wh
250W	8 hours	2,000Wh	3,125Wh

These are arithmetic examples, not estimates for a specific home. Increasing hours changes stored-energy needs even when the output in watts stays the same. Medical equipment needs a separate supplier-approved plan; use the CPAP guide for the questions to ask.

Capacity is only one of four checks

• Voltage: a 120V station does not establish support for a 240V appliance. Check the exact appliance and output socket.
• Continuous watts: sum the loads that run at the same time and stay within the output rating.
• Startup demand: compressors and pumps may need more power briefly. Verify the station and appliance requirements together; a special resistive-load boost mode is not a universal solution.
• Energy and replenishment: check delivered energy, required hours, reserve and the time before a suitable recharge source is available.

Apply the worksheet before choosing a model

BLUETTI lists the Elite 200 V2 at 2,073.6Wh with 2,600W continuous output at 120V. Its rated capacity exceeds the worked example’s 1,516Wh result. That comparison makes it a candidate to investigate; it does not prove it will start your refrigerator or deliver twelve hours. It also does not establish support for 240V house loads. Check the ordinary output specification and the exact U.S. configuration before using the purchase links below.

For other candidates, compare home-backup stations. For a compressor appliance, read the refrigerator guide. Keep recharge assumptions explicit: a panel’s rated watts are not a promise of that output for every daylight hour. Use the panel compatibility guide.

Plug-in backup and house circuits

Powering selected appliances directly from a station differs from connecting a house’s circuits. Never feed a house through a wall outlet. Have a qualified electrician assess any transfer equipment, wiring, permits and compatible system. A portable unit’s capacity headline does not authorize a circuit connection.

Frequently asked questions

Will a 2,000Wh power station run my whole house?

It depends on loads, hours, voltage, output and connection equipment. Two thousand watt-hours alone cannot establish whole-house operation. Start with essential appliances and a replenishment plan.

Should I buy extra capacity instead of calculating?

Extra energy can help, but it cannot fix the wrong voltage, an inadequate inverter or an unsafe connection. Calculate first, then check those limits before buying.

Does a product image prove the planned setup works?

No. The image identifies the pictured product. Confirm exact device requirements, connections and the recharge plan independently before relying on the setup.

What changed

Updated Oct 14, 2026: clarified the static worksheet, loss and reserve assumptions, and the checks that capacity alone cannot answer.