Home Power Facts EcoFlow DELTA Pro Ultra (1 inverter + 1 battery) vs Goal Zero Yeti PRO 4000
The EcoFlow DELTA Pro Ultra (1 inverter + 1 battery) delivers more usable capacity than the Goal Zero Yeti PRO 4000 (about 5,486 Wh vs 3,195 Wh). The EcoFlow DELTA Pro Ultra (1 inverter + 1 battery) has the stronger inverter (7,200 W vs 3,600 W continuous). A typical refrigerator runs about 3.4 days on the EcoFlow DELTA Pro Ultra (1 inverter + 1 battery) and 47.9 h on the Goal Zero Yeti PRO 4000.
Specs verified 2026-10-19. Every value below links to its source.
Where they differ
Better on 5 of 7
EcoFlow DELTA Pro Ultra (1 inverter + 1 battery)
- EcoFlow DELTA Pro Ultra (1 inverter + 1 battery): more usable capacity (5,486 Wh vs 3,195 Wh, Goal Zero Yeti PRO 4000).
- EcoFlow DELTA Pro Ultra (1 inverter + 1 battery): higher continuous AC output (7,200 W vs 3,600 W, Goal Zero Yeti PRO 4000).
- EcoFlow DELTA Pro Ultra (1 inverter + 1 battery): higher surge rating (10,800 W vs 7,200 W, Goal Zero Yeti PRO 4000).
- EcoFlow DELTA Pro Ultra (1 inverter + 1 battery): lower price per usable Wh ($1.06 vs $1.25, Goal Zero Yeti PRO 4000), the fairest value measure across sizes.
- EcoFlow DELTA Pro Ultra (1 inverter + 1 battery): more solar input (5,600 W vs 3,000 W, Goal Zero Yeti PRO 4000).
Better on 2 of 7
Goal Zero Yeti PRO 4000
- Goal Zero Yeti PRO 4000: lighter (115.7 lb vs 181.8 lb, EcoFlow DELTA Pro Ultra (1 inverter + 1 battery)).
- Goal Zero Yeti PRO 4000: lower list price (3,999.95 USD vs 5,799 USD, EcoFlow DELTA Pro Ultra (1 inverter + 1 battery)).
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Specs side by side
| Spec | EcoFlow DELTA Pro Ultra (1 inverter + 1 battery) | Goal Zero Yeti PRO 4000 |
|---|---|---|
| Rated capacity | 6,144 Wh[source]Battery spec in the manual: 'Capacity | 102.4V⎓60A, 6,144Wh'. Base configuration is 1 inverter + 1 battery. | 3,994 Wh[source]'Battery Capacity 3994 Wh(51.2 V, 78 Ah)'. Elsewhere on the page: 'Battery Pack Capacity: 3993.6 Wh'. |
| Usable capacity (measured) | 5,486 Wh[source]Trusted Reviews: 'delivered 89.29% of its rated capacity over AC at a load of 2000W' (best 92.55% at 500W). 89.29% × 6144 = 5486 Wh (calculated). Tested on the UK 230 V version with one battery. Other results: Lakehouse & Cottage (an EcoFlow retailer, so not independent) 5,620 Wh AC / 4,936 Wh DC; The Solar Lab claimed 98% efficiency at ~6,000 W (not used). | Not publishedNo independent measured usable capacity found (searched 2026-10-19). Checked The Solar Lab, CleanTechnica, TechRadar and Outdoor Life; none publishes a discharge figure. |
| AC continuous output | 7,200 W[source]Manual (US): 'AC Output (Discharge Only) | US: 120/240V～60Hz 7200W total'. | 3,600 W[source]'AC (Inverter)(pure sine wave): 3600 W Continuous, 7200 W Surge, 120 V AC, 60 Hz, 30 A'. A single 20 A outlet is limited to 2400 W. |
| AC surge output | 10,800 W[source]Product page specs: 'AC Surge Output 10.8kW'. | 7,200 W[source]'7200 W Surge'. |
| 240 V output | Yes[source]Manual (US): '120/240V～60Hz 7200W total ... 240V～30A (×1)'. Product page: '1 x 120V/240V, 30A Max' socket. Split phase from a single inverter. | No[source]One unit outputs 120 V only. The guide's display icons include 'Yetis Chained in Series (240V)', so 240 V needs two linked units. Its AC input accepts '240V AC up to 13A (3000W max)' in, not out. |
| Battery chemistry | LiFePO4[source]Manual battery spec: 'Cell Material | LFP'. | LiFePO4[source]'Cell chemistry LiFePO4 (Lithium Iron Phosphate)'. |
| Cycle life | 3500 cycles to 80%[source]Manual battery spec: 'The battery maintains 80%+ SOH (state of health) after 3,500 cycles at 0.5C/0.5C at 25°C (77°F)'. | 4,000 cycles to 80%[source]Product page: '4000+ (1C discharge 80% ODC)'. User guide: '4000 (0.5C discharge, climate controlled, 80% original capacity.)'. |
| AC charging | 1,800 W[source]Manual (US) AC input: 'Charge Only | US: 100-120V～15A, 200-240V~12.5A'. 1800 W is 15 A × 120 V (calculated); about 3000 W at 240 V. The separate Power In/Out port is rated '100-120～30A; 200-240V～30A'. | 1,800 W[source]'AC Fast Charge: 1800W (90V-144V, up to 15A)'. Ships set to a 400 W 'Low' charge speed (user guide). |
| Max solar input | 5,600 W[source]Product page: 'Solar Charging Input Total 5600W, 2 ports'. | 3,000 W[source]'HPP High Voltage Input: 3000W Max (13.3-150 V, up to 30A)'. The separate 8 mm input adds at most 275 W. |
| Expandable | Yes[source]Manual: 'An inverter supports up to 5 batteries.' | Yes[source]'Chainable Yes (Up to 4 tank Pros per Yeti Pro)'. |
| UPS / EPS switchover | 20 ms[source]Manual: 'US: Backup UPS <20 ms; online UPS 0 ms'. The 0 ms online-UPS mode only applies to the Online UPS sockets. | 15 ms[source]User guide, Automatic Power Switching: 'switches from grid to battery in under 15ms, but it does not support 0ms switching.' |
| Weight | 181.8 lb[source]Product page: 'Inverter Net Weight 31.7 kg (70 lb)' + 'Battery Net Weight 50.7 kg (111.8 lb)' = 181.8 lb for the base set. The manual gives approx. 70.8 lb + 111.3 lb. Two separate pieces. | 115.7 lb[source]'Weight 115.7 lbs (52kg)'. With the roll cart: '125.7 lbs. (57.0 kg)'. |
| Warranty | 5 years[source]US warranty policy: 'DELTA Pro Ultra Inverter | 5 years' and 'DELTA Pro Ultra Battery | 5 years'. | 5 years[source]'Warranty: 5 years'. |
| List price | $5,799[source]Regular (compare-at) price $5,799 for 'DELTA Pro Ultra (1 × Inverter + 1 × Battery)', sale price $4,199, seen 2026-10-19. | $3,999.95[source]Regular price seen 2026-10-19, no sale (compare-at also $3,999.95). In stock. |
| Usable capacity used for runtimes | 5,486 Wh | 3,195 Wh (est. 80%) |
Runtime on one charge
Runtime = usable capacity ÷ average draw, the same formula for both models (no idle draw added to either), after checking continuous output and startup surge. Usable capacity is an independent test's measured figure, or 80% of rated where none exists. See the methodology.