Home Power Facts Anker SOLIX F3800 vs EcoFlow DELTA Pro Ultra (1 inverter + 1 battery)
The EcoFlow DELTA Pro Ultra (1 inverter + 1 battery) delivers more usable capacity than the Anker SOLIX F3800 (about 5,486 Wh vs 2,905 Wh). The EcoFlow DELTA Pro Ultra (1 inverter + 1 battery) has the stronger inverter (7,200 W vs 6,000 W continuous). A typical refrigerator runs about 43.6 h on the Anker SOLIX F3800 and 3.4 days on the EcoFlow DELTA Pro Ultra (1 inverter + 1 battery).
Specs verified 2026-10-18. Every value below links to its source.
Where they differ
Better on 3 of 7
Anker SOLIX F3800
- Anker SOLIX F3800: lighter (132.3 lb vs 181.8 lb, EcoFlow DELTA Pro Ultra (1 inverter + 1 battery)).
- Anker SOLIX F3800: lower list price (2,299.99 USD vs 5,799 USD, EcoFlow DELTA Pro Ultra (1 inverter + 1 battery)).
- Anker SOLIX F3800: lower price per usable Wh ($0.79 vs $1.06, EcoFlow DELTA Pro Ultra (1 inverter + 1 battery)), the fairest value measure across sizes.
Better on 4 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 2,905 Wh, Anker SOLIX F3800).
- EcoFlow DELTA Pro Ultra (1 inverter + 1 battery): higher continuous AC output (7,200 W vs 6,000 W, Anker SOLIX F3800).
- EcoFlow DELTA Pro Ultra (1 inverter + 1 battery): higher surge rating (10,800 W vs 9,000 W, Anker SOLIX F3800).
- EcoFlow DELTA Pro Ultra (1 inverter + 1 battery): more solar input (5,600 W vs 2,400 W, Anker SOLIX F3800).
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Specs side by side
| Spec | Anker SOLIX F3800 | EcoFlow DELTA Pro Ultra (1 inverter + 1 battery) |
|---|---|---|
| Rated capacity | 3,840 Wh[source]Tech Specs: 'Capacity: 3,840Wh'. This is the original F3800 (SKU A1790111), not the F3800 Plus, which has generator bypass, 6,000 W AC input and 3,200 W solar. | 6,144 Wh[source]Battery spec in the manual: 'Capacity | 102.4V⎓60A, 6,144Wh'. Base configuration is 1 inverter + 1 battery. |
| Usable capacity (measured) | 2,905 Wh[source]Notebookcheck measured 2,905 Wh at a constant ~260 W load from 100% to auto-off (about 75% of rated). StorageReview measured 2.98 kWh usable on a US unit. The lower figure is used. | 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). |
| AC continuous output | 6,000 W[source]'AC Continuous Output: 6,000W, 120V&240V Dual Voltage'. Two F3800s can be linked for 12 kW. | 7,200 W[source]Manual (US): 'AC Output (Discharge Only) | US: 120/240V～60Hz 7200W total'. |
| AC surge output | 9,000 W[source]'AC Surge Output: 9,000W'. | 10,800 W[source]Product page specs: 'AC Surge Output 10.8kW'. |
| 240 V output | Yes[source]'6,000W, 120V&240V Dual Voltage' from a single unit through NEMA 14-50 and L14-30 outlets; no accessory needed. The 240V outlets cannot be used while the unit is AC charging (official FAQ). | 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. |
| Battery chemistry | LiFePO4[source]'LFP, 3,000+ cycles'. | LiFePO4[source]Manual battery spec: 'Cell Material | LFP'. |
| Cycle life | 3,000 cycles to 80% capacity[source]Tech Specs says 'LFP, 3,000+ cycles'. The official comparison data says '3,000 (At least 80% battery capacity)'. | 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)'. |
| AC charging | 1,800 W[source]'AC Input Recharge: Max. 1,800W' (120 V input). The F3800 Plus accepts 6,000 W AC. | 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'. |
| Max solar input | 2,400 W[source]'Max. 2,400W (2x 1,200W), 25A each' via two XT-60 inputs, 60 V max open-circuit voltage per port. | 5,600 W[source]Product page: 'Solar Charging Input Total 5600W, 2 ports'. |
| Expandable | Yes[source]'Up to 6 x Expansion Batteries (3.84kWh each)' (BP3800). | Yes[source]Manual: 'An inverter supports up to 5 batteries.' |
| UPS / EPS switchover | 20 ms[source]'UPS Switch Time: <20ms'. Official FAQ: while AC charging, only the 120V UPS outlet can power devices. | 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. |
| Weight | 132.3 lb[source]Tech Specs: 'Net Weight: 132.3 lb'. The official comparison data on the same page says '60 kg / 132 lb'. | 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. |
| Warranty | 5 years[source]'5-year warranty'. | 5 years[source]US warranty policy: 'DELTA Pro Ultra Inverter | 5 years' and 'DELTA Pro Ultra Battery | 5 years'. |
| List price | $2,299.99[source]Seen 2026-10-18: list price $2,299.99 with 'Save $100' via an auto-applied code, giving a $2,199.99 sale price (also the price in the page's structured data). | $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. |
| Usable capacity used for runtimes | 2,905 Wh | 5,486 Wh |
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.