powerstations.reviews

Sizing

How many watt-hours do I need?

How sizing works

Three numbers decide whether a power station fits: the watt-hours it must store, the watts it must deliver at once, and the surge it must supply when a motor starts. Choose the appliances below or add your own watts, hours and quantity. Check the connection too: enough energy does not make a station suitable for house wiring.

Your devices

Appliances and presets

Tick appliances from the device table, or add your own appliance using its label or a plug-in watt meter. Keep a preset only if it matches the equipment you plan to run.

Any picks earlier on this page use the starting appliances. Your changes update the calculator and its table below.

Capacity1,795 Wh
AC running102 W
AC startup1,360 W
26 units fit · View results ↓

For a well pump, furnace or house inlet, check the connection before choosing by watts. The home-backup guide explains what an electrician needs to check.

Home
Qty h/day rated 90 W
Qty h/day rated 180 W
Qty h/day avg 41 W · start-up 1,300 W
Qty h/day rated 10 W
Qty h/day rated 1,500 W
Qty h/day rated 1,116 W · start-up 2,900 W
Qty h/day rated 89 W
Medical
Qty h/day rated 45 W
Qty h/day rated 53 W · start-up 104 W
Qty h/day rated 120 W
Camp and outdoors
Qty h/day rated 6 W
Work and tools
Qty h/day rated 1,800 W · start-up 2,300 W
Qty h/day rated 40 W
Qty h/day rated 20 W
Qty h/day avg 88 W
Qty h/day rated 24 W

Add your own appliances

Your entries stay in this tab. They are not saved in a link or sent with calculator events.

Use running watts while the appliance is on. For a cycling fridge or pump, enter the hours connected and the percentage of that time it runs. If your watts are already a daily average, leave duty at 100%. Startup watts must include the full startup draw, not just the extra watts.

Rated capacity you need

1,795Wh

AC running peak

102W

AC start-up peak

1,360W

Device energy · conversion loss · headroom

Your devices use 1,271 Wh a day; ÷ 0.85 for inverter losses × 1.2 for headroom = 1,795 Wh to buy.

The loss allowance is an estimate. Headroom adds 20% to the energy requirement. All selected appliances can run together; copies in the same custom row can start together.

DC rows use this separate estimate. The default keeps the same loss allowance as AC; change it only if you know the efficiency of your cable and converter. Port voltage, current and shared limits still need checking.

26 of 56 tracked units fit

View matching units ↓

Units that fit the requirement above, sorted by price per Wh
Unit Verdict Wh AC W Surge W lb Chemistry Price $ $ / Wh Store
OUPES Mega 2 Pro fits 2,048 2,500 – 48.8 LiFePO4 $699 $1,599 at OUPES, checked 7 Oct 2026 $0.34 See it at OUPES
OUPES Mega 2 fits 2,048 2,500 5,400 48.5 LiFePO4 $729 $1,499 at OUPES, checked 7 Oct 2026 $0.36 See it at OUPES
BLUETTI Elite 400 fits 3,840 2,600 5,200 86 LiFePO4 $1,399 at BLUETTI, checked 7 Oct 2026 $0.36 See it at BLUETTI Check price on Amazon
BLUETTI Elite 300 fits 3,014 2,400 4,800 58 LiFePO4 $1,099 $1,199 at BLUETTI, checked 7 Oct 2026 $0.36 See it at BLUETTI Check price on Amazon
EcoFlow DELTA 3 Max fits 2,048 2,400 – 44.8 LiFePO4 $799 $1,199 at EcoFlow, checked 7 Oct 2026 $0.39 See it at EcoFlow
EcoFlow DELTA 3 Ultra fits 3,072 3,600 7,200 72.1 LiFePO4 $1,199 $1,599 at EcoFlow, checked 7 Oct 2026 $0.39 See it at EcoFlow
OUPES Mega 3 fits 3,072 3,600 7,000 83.3 LiFePO4 $1,199 $2,299 at OUPES, checked 7 Oct 2026 $0.39 See it at OUPES
BLUETTI Elite 200 V2 fits 2,074 2,600 – 53.4 LiFePO4 $849 $899 at BLUETTI, checked 7 Oct 2026 $0.41 See it at BLUETTI Check price on Amazon
Anker SOLIX C2000 Gen 2 fits 2,048 2,400 4,000 41.7 LiFePO4 $849.99 $1,499.99 at Anker SOLIX, checked 7 Oct 2026 $0.42 See it at Anker SOLIX
Jackery HomePower 3000 fits 3,072 3,600 7,200 59.5 LiFePO4 $1,284 $1,499 at Jackery, checked 7 Oct 2026 $0.42 See it at Jackery Check price on Amazon
Jackery Explorer 2000 v2 fits 2,042 2,200 4,400 39.5 LiFePO4 $864 $999 at Jackery, checked 7 Oct 2026 $0.42 See it at Jackery Check price on Amazon
Anker SOLIX F3000 fits 3,072 3,600 7,200 91.5 LiFePO4 $1,299.99 $1,699.99 at Anker SOLIX, checked 7 Oct 2026 $0.42 See it at Anker SOLIX Check price on Amazon
Jackery HomePower 3600 Plus fits 3,584 3,600 7,200 77.2 LiFePO4 $1,554 $1,899 at Jackery, checked 7 Oct 2026 $0.43 See it at Jackery Check price on Amazon
BLUETTI AC200L fits 2,048 2,400 3,600 62.4 LiFePO4 $899 at BLUETTI, checked 7 Oct 2026 $0.44 See it at BLUETTI Check price on Amazon
Anker SOLIX F3800 fits 3,840 6,000 9,000 132.3 LiFePO4 $1,799.99 $2,199.99 at Anker SOLIX, checked 7 Oct 2026 $0.47 See it at Anker SOLIX Check price on Amazon
BLUETTI Apex 300 fits 2,765 3,840 – 83.8 LiFePO4 $1,499 $1,699 at BLUETTI, checked 7 Oct 2026 $0.54 See it at BLUETTI Check price on Amazon
Jackery Explorer 5000 Plus fits 5,040 7,200 14,400 134.5 LiFePO4 $2,899 $3,499 at Jackery, checked 7 Oct 2026 $0.58 See it at Jackery Check price on Amazon
Anker SOLIX F3800 Plus fits 3,840 6,000 9,000 136.7 LiFePO4 $2,269.99 $2,699.99 at Anker SOLIX, checked 7 Oct 2026 $0.59 See it at Anker SOLIX Check price on Amazon
DJI Power 2000 fits 2,048 3,000 – 48.5 LiFePO4 $1,299 at DJI, checked 6 Sep 2026 $0.63 See it at DJI Check price on Amazon
EcoFlow DELTA Pro 3 fits 4,096 4,000 8,000 113.5 LiFePO4 $2,799 $3,699 at EcoFlow, checked 7 Oct 2026 $0.68 See it at EcoFlow Check price on Amazon
Anker SOLIX F2600 fits 2,560 2,400 2,800 69.7 LiFePO4 $1,999.99 at Anker SOLIX, checked 7 Oct 2026 $0.78 See it at Anker SOLIX Check price on Amazon
Zendure SuperBase Pro 2000 fits 2,096 2,000 4,000 46.5 NMC $1,999 at Zendure, checked 7 Oct 2026 $0.95 See it at Zendure Check price on Amazon
Goal Zero Yeti PRO 4000 fits 3,994 3,600 7,200 115.7 LiFePO4 $3,999.95 at Goal Zero, checked 7 Oct 2026 $1.00 See it at Goal Zero
Zendure SuperBase V4600 fits 4,608 3,800 5,000 121 LiFePO4 $4,999 at Zendure, checked 7 Oct 2026 $1.08 See it at Zendure
Zendure SuperBase V6400 fits 6,438 3,800 5,000 130 Li-ion (unspecified) $6,999 at Zendure, checked 7 Oct 2026 $1.09 See it at Zendure
4Patriots Patriot Power Solar Generator 2200X fits 2,240 2,200 4,400 57.5 LiFePO4 $3,199 $3,499 at 4Patriots, checked 7 Oct 2026 $1.43 See it at 4Patriots

Add a device
Five numbers, five different jobs
  1. Capacity (Wh). The tank: how much energy is stored.
  2. Output (W). The pipe: how much power can flow at once.
  3. Surge (W). The burst: brief extra power to start a motor.
  4. Solar input (W). The panel: the ceiling on solar charging power.
  5. Weight (lb / kg). The scale: how much you have to carry.

Step 1: watt-hours per device

Watts × hours = watt-hours. A device's draw comes from its label or its maker's spec sheet; for a cycling load like a refrigerator the useful energy figure is the average over a day, which can come from its yearly energy rating: kWh per year × 1,000 ÷ 8,760 hours = average watts. Add every device's watt-hours together, then multiply by the number of days. In a custom row, quantity multiplies the energy and peak power. Time running multiplies energy only: a pump cycling for part of the day still needs its full running and startup watts while it is on. An annual energy average cannot tell you those peak watts.

Step 2: inverter losses

The AC calculation divides device watt-hours by 0.85 as a planning allowance for conversion losses. This is not a measured efficiency for your station. DC and USB rows use the separate efficiency input, which starts with the same allowance. Their energy is calculated separately before adding it to the AC requirement. A compatible DC cable can avoid the AC inverter, but its converter still uses some power.

Step 3: headroom

Multiply by 1.2. The calculator adds 20% to the energy requirement as a planning margin. This allowance is fixed here; it is not a measured reserve or a promise that a particular appliance will finish the night.

Step 4: the two watt checks

Running peak is every device you might run at the same time, added up; it must sit under the unit's continuous AC rating. Start-up peak adds the largest extra startup demand to that running total. Copies in one custom row are assumed to start together; separate rows start one group at a time. If separate motors can start together, size for that combined startup demand. DC demand stays separate from the AC inverter check.

Step 5: match the voltage and connection

The normal fit result is for compatible 120 V plug-in appliances. Hardwired loads and 120/240 V split-phase loads keep their energy estimate, but get no confirmed fit. The home-backup connection guide explains the checks to take to an electrician. For DC equipment, match the voltage, connector, cable and shared port limits before buying.

Worked examples

A refrigerator for a day

  • Refrigerator (full-size, ENERGY STAR, ~18 cu ft top freezer)41 W × 24 h
  • Device Wh992
  • ÷ 0.85 × 1.21,400 Wh
  • Running peak42 W
  • Start-up peak1,300 W

A CPAP with humidifier for two nights

  • CPAP machine (with heated humidifier)53 W × 8 h × 2 d
  • Device Wh848
  • ÷ 0.85 × 1.21,198 Wh
  • Running peak53 W
  • Start-up peak104 W

A laptop and a phone for a working day

  • Laptop (MacBook Air, charging)40 W × 8 h
  • Smartphone charger (USB-C)20 W × 2 h
  • Device Wh360
  • ÷ 0.85 × 1.2509 Wh
  • Running peak60 W
  • Start-up peak60 W

Amp-hours to watt-hours

Batteries are often rated in amp-hours (Ah) at a voltage; watt-hours are amp-hours times volts. A 100 Ah 12 V battery holds 1,200 Wh; a 100 Ah 24 V battery, 2,400 Wh; a 100 Ah 48 V battery, 4,800 Wh. Going the other way, a 1,024 Wh power station is about 85 Ah at 12 V or 20 Ah at 51.2 V, which is the nominal voltage of a 16-cell LiFePO4 pack. Compare batteries in watt-hours, never in amp-hours, unless the voltages match. The watts and watt-hours guide has converters for each.

How long will 2,000 Wh last?

Capacity × 0.85 ÷ the device's watts, by the same arithmetic the calculator uses. On a 2,000 Wh unit: Refrigerator (full-size, ENERGY STAR, ~18 cu ft top freezer) (41 W) about 41 hours; CPAP machine (with heated humidifier) (53 W) about 32 hours; Laptop (MacBook Air, charging) (40 W) about 43 hours; TV, 50-inch LED / Crystal UHD (89 W) about 19 hours; Wi-Fi router (24 W) about 71 hours. Several devices at once share that capacity, so add their watts first. A 2,000 Wh unit is the mid-to-large boundary in the size classes: enough for a refrigerator for about two days, or a working day of laptop, connectivity and a fridge with a margin.

The device draws the calculator uses

Each draw is the device manufacturer's rating, a US government energy figure, or a power station brand's published device table; "average" is a cycling load's daily average, "rated" the steady draw as specified. Your device may differ: read its label and change the hours or the device in the calculator.

Device draws
Device Group Draw W Basis Start-up W Default h/day Source
Box fan, 20 inch (Lasko Pro Power 20 inch box fan, model B20548, 3 speeds: 65 W on low, 90 W on high, and 90 W is used here as the high-speed figure. The same block gives 'Current 0.6 A to 1 A' and 'Voltage 120 V'. Worth noting for sizing: an inverter sees volt-amps, not watts, and 120 V x 1 A = 120 VA on high against the stated 90 W, a power factor of about 0.75 typical of a shaded-pole motor, so size against roughly 120 VA. Lasko publishes no starting figure. Their Cool Colors B20308 box fan is 56-83 W if a lower preset is wanted.) home 90 rated – 8 lasko.com
Electric blanket (full size) (Biddeford Blankets electric warming blanket with digital controller. Their listed electrical specifications give Twin 180 W, Full 180 W, Queen 130 W per side, King 180 W per side, all at 120 Vac. Resistive heating element, so no startup surge. Sunbeam was tried first as the task suggested but publishes no wattage anywhere: their old product URLs 404, their live catalog of 250 products mentions no wattage on any blanket, and three of their heated-bedding manual PDFs state only 'Plug power cord into a 110-120 volt wall outlet'.) home 180 rated – 6 biddeford-blankets.com
Refrigerator (full-size, ENERGY STAR, ~18 cu ft top freezer) (Running: ENERGY STAR Certified Residential Refrigerators dataset (US EPA open data), filtered to non-compact, non-built-in, 18-22 cu ft. 362 kWh/yr = 362,000 Wh / 8,760 h = 41.3 W average. Surge is from a manufacturer: Whirlpool Tech Sheet W11509412 Rev A (27 cu ft) lists 'Current locked rotor 11.3 A +/- 5%' on 115 VAC parts, so 11.3 A x 115 V = 1,299.5 W, rounded to 1,300 W (Whirlpool tech sheet). That same Whirlpool sheet independently cross-checks the average: 'Average Total Wattage' of 90-110 W while the compressor runs, x 45% run time at 70F ambient, is about 45 W, close to the 41.3 W derived from kWh/yr.) home 41 average 1,300 24 data.energystar.gov
LED light bulb, A19 60 W equivalent (GE Classic LED, GEL SKU 67615 (LED10DA19/SWPW/4PK). The '60 Watt' in the product name is the equivalency claim, not the draw; actual draw is 10 W at 120 V for 800 lumens. GE's Basic line of the same A19 60 W replacement is 8.5 W for 700 lumens, so GE's range across lines is 8.5-10 W. Note that ENERGY STAR no longer certifies general-service bulbs; its only remaining bulb dataset covers connected/smart bulbs.) home 10 rated – 5 gelighting.com
Space heater, 1500 W (Lasko 754201 ceramic heater on its high setting. The same spec block gives 'Current 7.5 A to 12.5 A' and 'Voltage 120 V': 12.5 A x 120 V = 1,500 W confirms the high setting and 7.5 A x 120 V = 900 W the low setting. Resistive load, so no startup surge.) home 1,500 rated – 3 lasko.com
Sump pump, 3/10 HP submersible (Zoeller Technical Data Sheet FM2778 (Mighty-Mate series) model comparison chart: the M53 runs on 115 V, 1 phase, 9.7 A, 3/10 HP, which is the closest Zoeller builds to the 1/3 HP class. 9.7 A x 115 V = 1,115.5 W. The 230 V variants draw 4.8 A. Zoeller publishes no locked-rotor figure, so the surge is the top of Jackery's published starting range for a 1/3 HP sump pump, 'Sump Pump 1/3HP | 800W | 1,300-2,900W', a power-station-maker source.) home 1,116 rated 2,900 2 zoellerpumps.com
TV, 50-inch LED / Crystal UHD (Samsung UN50U8000FFXZA, 50-inch Crystal UHD (2025). The same spec block gives Power Consumption (Max) 110 W, Power Consumption (Stand-by) 0.5 W, Power Supply AC110-120V~ 50/60Hz. Samsung's 43-inch U8000F is 85 W typical / 100 W max if a smaller preset is wanted.) home 89 rated – 4 samsung.com
Camp LED light set (4 chainable lights) (Goal Zero Light-a-Life Mini Quad USB Light Set: four chainable LED lights on one cord, NOT a decorative fairy-light string, for which no maker publishes a wattage. 6.3 W is Goal Zero's stated maximum for the whole 4-light set; their LED Rating row repeats '6.3W max, 110 Lumens (High), 30 Lumens (Low)'. Caution: Goal Zero's own figures are internally inconsistent, since 5 V x 1.7 A = 8.5 W and their per-light 1.7 W max x 4 = 6.8 W, neither of which equals the 6.3 W they state. Their stated 6.3 W is reported here rather than either computed value.) camp 6 rated – 4 goalzero.com
Circular saw, 7-1/4 in corded (DEWALT DWE575SB, listed on the same page as Voltage 120V, Corded. 15 A x 120 V = 1,800 W rated draw, which a saw only pulls in a hard cut. DeWalt publishes no startup figure, so the surge comes from Jackery's appliance wattage chart row 'Saw - Circular, 7 1/4in | 900-1,400W | 2,300W' (https://www.jackery.com/blogs/knowledge/appliance-wattage-chart), a power-station-maker source rather than a tool-maker one.) work 1,800 rated 2,300 0.5 dewalt.com
Laptop (MacBook Air, charging) (Apple ships the M5 MacBook Air (13- and 15-inch) with a 40 W adapter rated to 60 W max. 40 W is the sustained rating; the machine draws less once its battery is full.) work 40 rated – 6 apple.com
Smartphone charger (USB-C) (Apple 20W USB-C power adapter as specified in the iPhone User Guide: Line Voltage 100 to 240 VAC, Output Voltage/Current 9 VDC/2.2 A. This is the adapter's maximum output, drawn only while the phone is actively fast-charging.) work 20 rated – 2 support.apple.com
Starlink Standard kit (dish + router) (Starlink's own Standard kit specification sheet. (75 + 100) / 2 = 87.5 W, the midpoint of the stated average band. Size for the full 100 W if the dish may run its snow-melt heater, which the same sheet rates at up to 40 mm/hour.) work 88 average – 12 starlink.com
Wi-Fi router (TP-Link Archer AX55 (AX3000 dual band Wi-Fi 6). 12 V x 2 A = 24 W. Important caveat: this is the bundled power adapter's rating, the ceiling the supply can deliver, not measured draw, and a real AX55 idles well below it. TP-Link publishes no typical-consumption figure, so 24 W is a safe upper bound for sizing but will understate runtime.) work 24 rated – 24 tp-link.com
CPAP machine (no heated humidifier) (ResMed publishes a typical-power figure only for the machine WITH its humidifier, so this configuration falls back to a power-station maker (Bluetti). Bluetti's quick-reference table gives 30-60 W for a basic CPAP: (30 + 60) / 2 = 45 W midpoint. The same table lists 'Startup/Peak Consumption | Up to 100'.) medical 45 rated – 8 bluettipower.com
CPAP machine (with heated humidifier) (ResMed AirSense 10 AutoSet/Elite user guide, the 'device with humidifier' edition. 90W power supply unit, DC output 24V 3.75A. Peak 104 W recorded as the surge figure.) medical 53 rated 104 8 document.resmed.com
Portable oxygen concentrator (Philips Respironics SimplyGo spec sheet. 120 W is the steady draw once the internal battery is charged; budget 150 W if the unit is also recharging its battery. AC input 100-240 VAC, 1.7 A max.) medical 120 rated – 12 documents.philips.com

Sources, with dates

Questions buyers ask

My fridge's label says 120 W. Why does the table use less?

The label is the compressor's running draw; the compressor runs perhaps a third of the day, so the daily average is far lower. The average is what decides watt-hours; the running figure and the start-up surge are what decide the watt checks. Both are in the table.

Should I size for the biggest day or the average day?

For the day that matters most. An outage kit is sized for the longest outage you plan to cover with the fridge running; a camping unit for the heaviest evening. Then add the headroom and, if solar will refill it, check the unit's input against the solar page's arithmetic.

Does running from USB-C or 12 V change the answer?

Use a custom row and choose DC / USB cable. That separates its energy from the AC loads and uses the DC efficiency you enter. A DC converter still has losses, and the voltage, cable and shared port limits need checking before a station is suitable.

Is 20% headroom too much?

It is a fixed planning allowance, not a guarantee of extra runtime. The calculator multiplies the energy requirement by 1.2. If a load must run through the night, use its actual draw and leave enough capacity for the conditions you expect.

How many watt-hours is a 100 Ah battery?

Amp-hours × volts. 100 Ah at 12 V is 1,200 Wh; at 24 V, 2,400 Wh; at 48 V, 4,800 Wh. A power station's rating is already in watt-hours, so compare in Wh.

Your shortlist

Compare power stations

Runtime is rated capacity × 0.85 ÷ watts. Check startup draw and connections separately. Prices are the maker's, with the day they were checked.