Product Evidence Page
Quick verdict
A well-measured mid-size unit: its usable capacity and efficiency are strong and independently recorded, but its surge falls short of the claim and a fan issue is widely reported.
Best for mid-size backup where expandability matters. Main strength: The Solar Lab measured 910 Wh usable of 1,024 Wh rated (89%) and 88.9% discharge efficiency. Main weakness: measured surge held about 2,600 W against a 3,600 W claim, and a fan behaviour has been widely reported by owners and reviewers. Evidence confidence: High (named-lab bench data on the exact model).
Buy this if / Avoid this if
- You want a mid-size station whose usable capacity is independently measured, not just rated (910 Wh, The Solar Lab).
- You value high discharge efficiency — 88.9% measured by The Solar Lab.
- You plan to expand capacity later; the DELTA 3 Plus supports add-on battery packs up to a 5 kWh system.
- You use LiFePO4 chemistry as a requirement rather than a preference.
- You are counting on the full 3,600 W surge — The Solar Lab measured it holding roughly 2,600 W.
- Fan noise or fan behaviour is a dealbreaker — it is a commonly reported issue on this model.
- You need a documented recharge time — no independently measured figure is on record here yet.
- You need more than mid-size capacity in a single box without expansion.
Claimed vs measured specifications
| Specification | Manufacturer claim | Independently measured | Difference | Confidence |
|---|---|---|---|---|
| Usable capacity | 1,024 Wh rated claim | 910 Wh — The Solar Lab measured | −11% (114 Wh) | High |
| Discharge efficiency | Unknown Unknown | 88.9% — The Solar Lab measured | — | High |
| Continuous output | 1,800 W claim | Unknown Unknown | — | — |
| Surge output | 3,600 W claim | ~2,600 W held — The Solar Lab measured | ≈−28% | High |
| AC recharge time | Unknown Unknown | Unknown Unknown | — | — |
| Max solar input | Unknown Unknown | Unknown Unknown | — | — |
Manufacturer values are labelled claims; measured values name the outlet that recorded them. Fields without a sourced value are marked Unknown rather than estimated.
Full specification table
| Rated battery capacity | 1,024 Wh claim |
|---|---|
| Measured usable capacity | 910 Wh — The Solar Lab measured |
| Battery chemistry | LiFePO4 claim |
| Cycle-life claim | Unknown Unknown |
| Continuous AC output | 1,800 W claim |
| Surge output | 3,600 W claim claim / ~2,600 W held measured |
| Discharge efficiency | 88.9% — The Solar Lab measured |
| Max solar input | Unknown Unknown |
| AC recharge time | Unknown Unknown |
| Expansion support | Yes — add-on battery packs, up to a 5 kWh system claim |
| Weight | Unknown Unknown |
| Dimensions | Unknown Unknown |
| Warranty | Unknown Unknown |
| Idle draw | Unknown Unknown |
Documented strengths
Independently measured usable capacity. 910 Wh delivered of 1,024 Wh rated (89%). measured Source: The Solar Lab. Confidence: High.
High discharge efficiency. 88.9% discharge efficiency — strong for its class. measured Source: The Solar Lab. Confidence: High.
Expandable LiFePO4 architecture. Supports add-on battery packs toward a 5 kWh system. manufacturer claim Confidence: Medium.
Documented weaknesses
Surge falls short of the claim. ~2,600 W held against a 3,600 W claim — matters for starting motors or compressors. measured Source: The Solar Lab. Confidence: High.
Reported fan behaviour. A fan issue on this model is widely reported by owners and reviewers. reported Condition: relevant for quiet indoor or overnight use. Confidence: Medium (recurring report, not a single bench figure).
Recharge time not independently recorded. No measured full-recharge figure is on record for this exact model here yet. Unknown
Owner feedback patterns
Owner-review sample size: Unknown Unknown. The most consistently surfaced independent signal to date is the reported fan behaviour noted above. We do not quantify recurring owner-reported patterns (reliability, app issues, port failures, firmware, delivery damage) until a sufficient verified-owner sample exists for this exact model. Forum discussion is not treated as verified-owner feedback.
Compatible accessories
| Capacity expansion | EcoFlow DELTA 3 series add-on battery packs manufacturer-stated |
|---|---|
| Solar panels | EcoFlow portable / rigid panels within the unit’s MPPT input window manufacturer-stated |
| Others (cables, covers) | Unknown Unknown |
Only manufacturer-stated compatible accessories are listed; we do not recommend technically incompatible add-ons.
Price and retailer
Evidence sources
| Publisher | Evidence type | Model | Measurement | Test date | Accessed | Confidence | Link |
|---|---|---|---|---|---|---|---|
| The Solar Lab | Independent bench test | DELTA 3 Plus (exact) | 910 Wh usable (89%); 88.9% discharge efficiency; surge held ~2,600 W vs 3,600 W claim | Unknown | 31 Jul 2026 | High | Unknown add URL |
Update history
- 31 July 2026 — Page created. Compiled claimed-vs-measured specs from The Solar Lab; every unsourced field marked Unknown.