Solar-balanced plan
EcoFlow DELTA Pro Ultra X
- Projected runtime
- 3.5 days
- Headroom
- 17.9%
- Weight
- 135.5 kg
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
Power stationsSections
← All use cases
Calculated scenario · sourced manifest
Portable Power for a Three-Day Outage
We size this setup for 72 hours and 8,856 Wh of delivered energy. 1 station passes every configured check; 79 fail at least one.
By the BatteryRank Engineering Team
Does this plan match your setup?
It includes Refrigerator (full-size), Chest freezer, Wi-Fi router + modem, 4 × LED lamp (60W-equivalent bulb). Check the daily hours and dated sources ↓
400 W of panels are configured for the solar projection. The station picks must still cover the stored-energy requirement. Runtime is a projection from the sourced loads and capacity assumptions; check your own equipment before buying.
Station picks
The one station that covers this plan
The smallest rated capacity that passes this exact plan in our catalog is 12,288 Wh: EcoFlow DELTA Pro Ultra X. Capacity alone does not establish fit; we also check continuous output and sourced startup requirements. Calculation sources ↓
Some links on this page are affiliate links. BatteryRank may earn a commission at no extra cost to you. Commission never affects whether a station passes these checks; when two stations tie on every measured criterion, the one with a live retail offer is shown.
01 · Load manifest
Every load in the calculation
Average draw applies each sourced duty cycle; energy is average draw × quantity × daily hours × scenario days.
| 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 · Reading the plan
Making the plan work for a three-day outage
What this situation actually demands
Three days is the point where a battery stops being the answer. The manifest asks for 8,856 Wh delivered, and the two cold appliances are 2,232 Wh of every 2,952 Wh day — 76% of the plan sits in two compressors. Only the largest, heaviest tier of the catalogue carries that on stored energy alone, which is why the useful question here is not "how big a battery" but "how does it get refilled". The 400 W array in this plan is not an accessory to the answer; over 72 hours it is most of it.
The trade-off to plan around
Treating 72 hours as a capacity figure. Multiply the day out, arrive at 8.9 kWh, and you have specified a station that weighs more than most people can move alone and costs more than the food it protects. The second mistake is subtler: the always-on Wi-Fi router draws 18 W around the clock, which is 432 Wh a day — half again what four LED lamps burn in eight hours, and 1,296 Wh across the outage. Nobody budgets for the router, and it is the third-largest line on this plan.
What to check for your household
The 0.35 and 0.30 duty cycles behind those compressor figures describe appliances holding temperature in a conditioned house. Three days into a summer outage the house is not conditioned, and both cabinets will cycle harder than modelled. The solar side is looser still: the harvest shown assumes usable sun, and a multi-day grid failure is usually caused by the weather that removes it. Neither figure knows your latitude, your season, or the storm that started this.
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 single recommended buying strategy above.
- 01EcoFlow DELTA Pro Ultra X3.5 days
Device decisions
Data rankings
Complete kits
Questions from the same calculation
- How much power do you need for a three-day outage?
- 8,856 Wh of delivered energy over 3 days, drawing 334 W if every device runs at once. Refrigerator (full-size) alone is 51% of that energy, so it is the load worth measuring first — the rest of the manifest barely moves the answer.
- What decides whether a station can start this setup?
- Refrigerator (full-size). Its sourced 1,200 W startup demand, arriving while the other devices keep running, sets a worst-case moment of 1,354 W — well above the 334 W running total. A station sized only to the running figure will carry this plan right up until that device restarts.
- Why is every load on this plan running through the inverter?
- None of the devices in this manifest has a manufacturer-supported DC input, so each one pays the DC-to-AC conversion cost. Where a device does offer a native 12 V cord — camping fridges especially — using it is the cheapest runtime you can buy.
- Do I really need three days of stored energy?
- Almost certainly not, and planning that way is what makes this scenario unaffordable. The 8,856 Wh figure assumes both compressors and the router run untouched for the full 72 hours. In practice people run cold appliances in blocks and watch a thermometer instead of a clock, which is a rationing decision rather than a purchase decision — and it moves the requirement far more than any station in the catalogue does.
- Why does adding solar change this more than adding capacity?
- Because capacity is spent once and an array is spent daily. A station that covers one day of this manifest and recharges each morning covers three days; a station holding three days of energy with no way to refill covers exactly three days and then stops. At the 2,952 Wh daily figure, an array that closes even half the gap turns a fixed deadline into an open-ended one.
- What can I cut from this plan, and what has to stay?
- The four LED lamps are 288 Wh a day between them — under 10% of the plan, and the cheapest comfort you can keep. The router is 432 Wh, and unlike the lamps it buys nothing while you sleep, so a timer on it is the single easiest saving here. The refrigerator and the freezer are the plan; everything else is noise around them.