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Three flagships leave out the people searching “backup under $1,000” and “3 kWh portable.” EcoFlow already sells those. Stay in one family so extras, panels, and transfer gear actually plug in.
| Model | Energy | AC output | House path | Price snapshot (Aug 2026) |
|---|---|---|---|---|
| DELTA 3 | 1.02 kWh · to 5 kWh | 1,800 W (X-Boost 2,200 W) | Cords. Extra battery first. | $599 / $699 |
| DELTA 3 Plus | 1.02 kWh · to 5 kWh | Same 1,800 W | Same, plus dual 500 W solar ports | $669 / $799 |
| DELTA 3 Max Plus | 2.05 kWh | 3,000 W (X-Boost 3,800 W) | Cords; extra pack $899 / $1,329 | $1,199 / $1,899 |
| DELTA 3 Ultra Plus | 3.07 kWh · 3–11 kWh | 3,600 W (X-Boost 4,600 W) | Transfer switch or inlet box | $1,599 / $2,199 |
| DELTA Pro 3 | 4 kWh · expandable | 4,000 W · 120/240 V | Portable 240 V + EcoFlow extras | $2,799 / $3,699 |
| DELTA Pro Ultra X | 12 kWh start | 12 kW | Smart Home Panel 3 ($3,099) | $7,999 · $10,999 with SHP3 |
Sources: us.ecoflow.com product pages checked August 18, 2026. Sale/list snapshots move. Confirm checkout. DELTA 3 Max Plus extra-battery photo is a manufacturer kit image, not a lab shot.
DELTA 3 is the fridge / CPAP / router box. It is not a well-pump machine. Buy the $389 / $499 extra pack before you buy a second brand.
DELTA 3 Plus is the same energy and watts with dual solar input (1,000 W) and faster USB-C. Worth it if you already plan a 220 W or 400 W panel.
DELTA 3 Max Plus doubles energy and jumps to 3 kW. Use it when a window AC or microwave is in the plan and you still want a cart, not a stacked inverter.
DELTA 3 Ultra Plus is the mid portable that EcoFlow documents with a transfer switch or inlet. 3.6 kW / 3 kWh. Do not confuse it with Ultra X.
DELTA Pro 3 is the 240 V portable. Ultra X + SHP3 is the automatic-house stack. Those two do not share batteries with DELTA 3.
1,024 Wh, 1,800 W, LFP, 5-year page warranty. Extra pack lists $389 sale / $499. Expand EcoFlow’s way to 5 kWh.
Keep this over base DELTA 3 only if you will actually hang two solar inputs. Watts and watt-hours are the same.
3,072 Wh / 3,600 W. EcoFlow lists a transfer-switch bundle. This is not Ultra X and does not use SHP3.
Step here when 240 V matters and you are not ready for a 12 kW stack.
Different battery line. Pair Smart Home Panel 3 if you want circuit-level shed.
Same-brand add-ons are how a $599 box becomes a weekend kit. Cross-brand 48 V packs are not a recommendation.
First add-on for DELTA 3 / Plus. Host required. Expand toward 5 kWh.
Check extra pack How to add it →
2,048 Wh add-on EcoFlow lists for Max Plus and Ultra Plus.
Check Max extra
After the storm, not during landfall. Maybe 1–2 kWh on a clear day.
Check 400 W panel Solar how-to →
Ultra Plus / Pro path uses the $399 kit. Ultra X automatic house uses SHP3.
Transfer kit SHP3 guide →