Product Evidence Page
Quick verdict
The DELTA Pro 3 backs up its numbers better than almost any large unit — the capacity claim holds, but the surge and recharge claims do not.
Best for whole-home and 240V backup. Main strength: independently measured 3,790 Wh usable of 4,096 Wh rated (93%, OutdoorGearLab) — the tightest claim-to-reality gap in its class. Main weakness: the 8,000 W surge and 50-minute recharge claims were not reproduced in independent testing. Evidence confidence: Medium. SolarGenLab Evidence Score: 8.9/10.
Buy this if / Avoid this if
- You need genuine 240V split-phase output for whole-home or job-site circuits.
- You want the highest independently verified usable-capacity ratio in the large-unit class (93%, OutdoorGearLab).
- You plan to expand capacity with additional battery packs over time.
- You need built-in L14-30, TT-30 and 6-20R outlets.
- You are relying on the 8,000 W surge figure — The Solar Lab sustained roughly 5,100 W for about a minute (measured), short of the claim.
- You expect the advertised 0–80% in 50 minutes — OutdoorGearLab measured about 2 hours 54 minutes for a full recharge.
- You need a 12V car socket (there is none) or simultaneous 120V and 240V operation.
- Weight is a constraint — it was measured at 114.1 lb (OutdoorGearLab), a two-person lift.
Claimed vs measured specifications
| Specification | Manufacturer claim | Independently measured | Difference | Confidence |
|---|---|---|---|---|
| Usable capacity | 4,096 Wh rated claim | 3,790 Wh — OutdoorGearLab measured | −7% (306 Wh) | Medium |
| Continuous output | 4,000 W claim | Unknown Unknown | — | — |
| Surge output | 8,000 W claim | ~5,100 W held ~1 min — The Solar Lab measured | ≈−36% | Medium |
| AC recharge time | 0–80% in 50 min claim | ~2 h 54 min full; input peaked ~1,600 W vs 1,800 W rated — OutdoorGearLab measured | Slower (see note) | Medium |
| Max solar input | 2,600 W claim | Unknown Unknown | — | — |
| Weight | Unknown Unknown | 114.1 lb — OutdoorGearLab measured | — | Medium |
| Idle consumption | Unknown Unknown | Unknown Unknown | — | — |
Note on recharge: the claim (0–80% in 50 min) and the measurement (full 0–100% in ~2 h 54 min) cover different windows, so we do not express the gap as a single percentage. Manufacturer values are labelled claims; measured values name the outlet that recorded them.
Full specification table
| Rated battery capacity | 4,096 Wh claim |
|---|---|
| Measured usable capacity | 3,790 Wh — OutdoorGearLab measured |
| Battery chemistry | LiFePO4 claim |
| Cycle-life claim | Unknown Unknown |
| Continuous AC output | 4,000 W, split-phase claim |
| Surge output | 8,000 W claim claim / ~5,100 W sustained ~1 min measured |
| AC outlets | L14-30, TT-30, 6-20R, plus standard 120V claim |
| USB / DC outputs | Unknown Unknown |
| Max solar input | 2,600 W claim |
| Solar voltage range | Unknown Unknown |
| AC recharge time | 0–80% in 50 min claim claim / ~2 h 54 min full measured |
| Car charging | No 12V car socket reported |
| 240V support | Yes, split-phase; cannot run 120V and 240V simultaneously reported |
| Expansion support | Yes — additional battery packs claim |
| Weight | 114.1 lb measured |
| Dimensions | Unknown Unknown |
| Warranty | Unknown Unknown |
| App / connectivity | Unknown Unknown |
| Noise level | Fan noise reportedly unnoticed running CPAPs/heaters overnight — OutdoorGearLab reported |
| Idle draw | Unknown Unknown |
Documented strengths
Class-leading usable capacity. 3,790 Wh delivered of 4,096 Wh rated (93%) — the tightest claim-to-reality gap in our roundup. measured Source: OutdoorGearLab. Confidence: Medium.
Genuine 240V split-phase output. Rates 4,000 W split-phase with L14-30, TT-30 and 6-20R outlets built in — suited to whole-home and job-site circuits. manufacturer claim (outlets reported present). Confidence: Medium.
Quiet under real overnight loads. Reported running CPAPs and heaters overnight with fan noise going unnoticed. independent observation Source: OutdoorGearLab. Confidence: Low–Medium (qualitative).
Documented weaknesses
Surge falls short of the claim. ~5,100 W sustained for about a minute against an 8,000 W claim — matters for starting large motors or compressors. measured Source: The Solar Lab. Confidence: Medium.
Recharge far slower than advertised. Full recharge measured at ~2 h 54 min, with input peaking near 1,600 W versus the 1,800 W rating, against a 0–80%-in-50-minutes claim. measured Source: OutdoorGearLab. Confidence: Medium.
Missing conveniences. No 12V car socket, and it cannot run 120V and 240V loads simultaneously. reported Condition: matters for mobile/RV use. Confidence: Medium.
Very heavy. Measured at 114.1 lb — a genuine two-person lift. measured Source: OutdoorGearLab. Confidence: Medium.
Owner feedback patterns
Owner-review sample size: Unknown Unknown. We do not report recurring owner-reported patterns (reliability, app issues, fan noise, port failures, firmware, delivery damage) until we have a sufficient verified-owner sample for this exact model. The strongest independent signal to date is OutdoorGearLab’s overnight CPAP and heater run with unobtrusive fan noise. Forum discussion is not treated as verified-owner feedback.
Compatible accessories
| Capacity expansion | DELTA Pro 3 Smart Extra Battery manufacturer-stated |
|---|---|
| Home integration | EcoFlow Smart Home Panel 2 manufacturer-stated |
| Solar panels | EcoFlow 400W portable / rigid panels within the 2,600 W, MPPT input window manufacturer-stated |
| Others (cables, covers, trolley) | 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 |
|---|---|---|---|---|---|---|---|
| OutdoorGearLab | Independent bench test | DELTA Pro 3 (exact) | 3,790 Wh usable (93%); full recharge ~2 h 54 min; input ~1,600 W; 114.1 lb; ran CPAPs/heaters overnight | Unknown | 29 Jul 2026 | Medium | Unknown add URL |
| The Solar Lab | Independent bench test | DELTA Pro 3 (exact) | ~5,100 W surge sustained ~1 min vs 8,000 W claim | Unknown | 29 Jul 2026 | Medium | Unknown add URL |
Update history
- 29 July 2026 — Page created (draft). Compiled claimed-vs-measured specs from OutdoorGearLab and The Solar Lab; every unsourced field marked Unknown.