How much energy does three-day outage need?

The answer band reports the sourced manifest's daily device energy before each station's conversion losses; the editable calculator recalculates it when any load changes.

Why do running power and startup surge both matter?

Running power checks whether every device can operate together. Worst-start surge checks the largest startup event while the other devices remain on.

Can I change the devices or duration?

Yes. The linked sizing calculator opens with this exact manifest, duration, solar, and weight configuration ready to edit.

How are station matches selected?

A station must pass capacity, continuous inverter, surge, and any configured weight constraint using the shared BatteryRank sizing engine.

← All use cases

Calculated scenario · sourced manifest

Portable Power for a Three-Day Outage

1 stations pass every configured check; 48 fail at least one.

Energy per day: 2,952 Wh
Running load: 334 W
Worst-start surge: 1,354 W
Required delivered energy: 8,856 Wh
Stations passing: 1
Stations failing: 48

Edit this plan in the sizing tool →

01 · Load manifest

Every load in the calculation

Average draw applies each sourced duty cycle; energy is average draw × quantity × daily hours × scenario days.

Sourced device loads and calculated energy
Device	Quantity	Hours / day	Average draw	Scenario energy	Source
Refrigerator (full-size)AC	1	24	63 W	4,536 Wh	Source · 2026-07-06
Chest freezerAC	1	24	30 W	2,160 Wh	Source · 2026-07-06
Wi-Fi router + modemAC	1	24	18 W	1,296 Wh	Source · 2026-07-06
LED lamp (60W-equivalent bulb)AC	4	8	9 W	864 Wh	Source · 2026-07-06

02 · Station picks

Three ways to cover the plan

Some links on this page are affiliate links. BatteryRank may earn a commission at no extra cost to you; commission never changes a fit result.

Solar-balanced plan

EcoFlow DELTA Pro Ultra X

Projected runtime: 3.5 days
Headroom: 17.9%
Weight: 135.5 kg
Current price: Not tracked

Why it fits

10,000 W sourced solar-input ceiling; 10,000 W usable in this plan

Main compromise

No measured compromise across 1 eligible models

Open sourced model dossier →

Solar balance

What recharging changes

On EcoFlow DELTA Pro Ultra X, the configured 400 W array harvests 1,120 Wh/day.

The remaining deficit is 2,353 Wh/day, for about 5.2 days of modeled runtime.

Review the published solar method →

Explore passing models by projected runtime

This ordered data view is separate from the three recommended buying strategies above.

01EcoFlow DELTA Pro Ultra X3.5 days

Device decisions

Data rankings

Best for Home Backup →

Complete kits

Refrigerator Outage kit →

Questions from the same calculation

How much energy does three-day outage need?: The answer band reports the sourced manifest's daily device energy before each station's conversion losses; the editable calculator recalculates it when any load changes.
Why do running power and startup surge both matter?: Running power checks whether every device can operate together. Worst-start surge checks the largest startup event while the other devices remain on.
Can I change the devices or duration?: Yes. The linked sizing calculator opens with this exact manifest, duration, solar, and weight configuration ready to edit.
How are station matches selected?: A station must pass capacity, continuous inverter, surge, and any configured weight constraint using the shared BatteryRank sizing engine.