Short answer
Choose DELTA Pro 3 for the stronger base unit: it publishes 4,096 Wh, 4,000 W continuous output and dual 120V/240V from one unit. Consider DELTA Pro when 3.6 kWh and 3,600 W cover measured loads, or when its published expansion path up to 25 kWh matters more than higher base output.
The capacity difference is 496 Wh, about 13.8% of DELTA Pro's rating. Runtime does not rise by a fixed percentage because losses, reserve and duty cycle matter.
| Decision point | DELTA Pro | DELTA Pro 3 |
|---|---|---|
| Base capacity | 3.6 kWh | 4,096 Wh |
| Continuous output | 3,600 W | 4,000 W |
| Single-unit 240V claim | Not listed on cited base-unit page | Dual 120V/240V |
| Published capacity range | 3.6-25 kWh | 4-12 kWh |
| Battery | LFP | LFP; 4,000 cycles to 80% |
| Best reason to choose | Loads fit or larger expansion ceiling matters | More base capacity, output or single-unit 240V |
Sources: EcoFlow DELTA Pro and EcoFlow DELTA Pro 3, checked 28 August 2026. Prices are omitted because they change frequently.
The 240V difference matters more than 400 W
The larger distinction is DELTA Pro 3's published dual 120V/240V output from one unit. This may matter for compatible pumps, workshop equipment or home integration. Verify outlet, startup demand, accessories, transfer equipment, code and installer requirements. Never improvise a panel connection.
Runtime comparison
Using the same assumptions, 4,096 Wh gives a modest advantage over 3,600 Wh. Enter both values in the runtime calculator. Enough energy does not guarantee enough output, startup capability, outlet compatibility or integration equipment.
Choose DELTA Pro if
- Essential loads fit below 3,600 W, including startup compatibility.
- 3.6 kWh gives required runtime after losses and reserve.
- You confirmed the exact connection accessories.
- Its like-for-like delivered offer is materially better.
Choose DELTA Pro 3 if
- You need 4,000 W continuous output.
- Single-unit dual 120V/240V fits a verified requirement.
- The extra 496 Wh is useful and expansion above 12 kWh is unnecessary.
- You prefer the newer platform after checking warranty and compatibility.
Compare current manufacturer offers
Check included cables, batteries, delivery and warranty. Do not compare headline prices across unlike bundles.
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Frequently asked questions
Is DELTA Pro 3 more powerful?
Its published continuous output is 4,000 W versus 3,600 W.
Which has more capacity?
4,096 Wh versus 3.6 kWh, a 496 Wh difference before losses.
Which is better for 240V?
DELTA Pro 3 publishes dual 120V/240V from one unit. Verify compatibility.
Methodology and limits
This comparison uses published US specifications. SolarStateData has not physically tested either unit and does not infer surge, noise, efficiency or reliability beyond cited material.