If you're shopping for residential outdoor power equipment, the first decision is usually about the type of power you need: a fuel-burning generator that can fast-charge EcoFlow's DELTA Pro battery, or a large battery power station that can back up a home on its own. The two EcoFlow families here-the SG4000 dual-fuel generator and the DELTA Pro Ultra 12kWh power station-serve those different roles, and each appears in two listings with different conditions and prices.
Quick take
The SG4000 is positioned as a DC fast-charging companion for DELTA Pro batteries, with a 196cc engine, dual-fuel operation, and up to 56A DC output. The DELTA Pro Ultra is a 12kWh-class battery with a 6144Wh base capacity, expandable to 90kWh, and enough AC output to run heavy household appliances. In this set, the two SG4000 listings are the lower-priced options, while the two DELTA Pro Ultra listings are the higher-priced options. The condition grades differ across all four listings.
Listed price comparison
| Product | Listed price | Price bar | Key spec at a glance |
|---|---|---|---|
| EcoFlow SG4000 DC Fast Charging Dual Fuel Smart Generator for DELTA Pro series | USD 1,261.25 | 196cc dual-fuel, 3200W DC fast charging | |
| EcoFlow SG4000 DC Fast Charging Dual Fuel Smart Generator for Home Power Backup | USD 1,573.75 | 196cc dual-fuel, 3200W DC fast charging | |
| EcoFlow DELTA Pro Ultra 12kWh LiFePo4 Power Station, Whole Home Power-cut Backup | USD 4,799.00 | 6144Wh LFP battery, expandable to 90kWh | |
| EcoFlow DELTA Pro Ultra 12kWh Power Station Lifepo4, Certified Refurbished | USD 4,999.00 | 6144Wh LFP battery, expandable to 90kWh |
Decision matrix
| Product | Suggested role | Consider this if |
|---|---|---|
| EcoFlow SG4000 for DELTA Pro series | Fuel-based DC fast charging for a DELTA Pro battery | You want the certified-refurbished SG4000 listing |
| EcoFlow SG4000 for Home Power Backup | Same fuel-based fast-charging role | You want the SG4000 listed as new |
| EcoFlow DELTA Pro Ultra 12kWh, Whole Home | Whole-home battery backup with expandable storage | You want the Ultra listing with the lower price |
| EcoFlow DELTA Pro Ultra 12kWh, Certified Refurbished | Whole-home battery backup with expandable storage | You want the Ultra listing with the certified-refurbished grade |
Product notes
EcoFlow SG4000 DC Fast Charging Dual Fuel Smart Generator for DELTA Pro series
The SG4000 is a dual-fuel inverter generator with a 196cc engine and up to 56A DC output. It is designed to fast-charge a DELTA Pro battery via 3200W DC fast charging, and its continuous working time on gas is listed as 2.8 hours at full load or 8 hours at quarter load. This particular listing is the certified-refurbished version and sits at the lower-priced end of the SG4000 pair. If you need a fuel-based charger for a DELTA Pro battery and want the certified-refurbished grade, this is the one to start with. The main limitation is that the listing notes it is not CARB-approved and cannot be shipped to California.
EcoFlow SG4000 DC Fast Charging Dual Fuel Smart Generator for Home Power Backup
This new-condition SG4000 listing has the same 196cc dual-fuel engine, 56A DC output, and 3200W DC fast-charging capability as the certified-refurbished version. It also carries the same continuous working times on gas: 2.8 hours at full load and 8 hours at quarter load. The difference is the condition grade-new rather than refurbished-which makes this the more expensive SG4000 listing in this set. If you want the same SG4000 feature set in a new unit, this is the listing that matches that preference. The limitation is that you're paying the higher listed price between the two generator listings for the new condition.
EcoFlow DELTA Pro Ultra 12kWh Power Station Lifepo4, Certified Refurbished
The certified-refurbished DELTA Pro Ultra is the top-priced listing in this comparison. It pairs a 6144Wh LFP battery with expansion ability up to 90kWh, along with LFP chemistry and a listed cycle life of 3500 cycles to 80% capacity. The unit is sold as a certified-refurbished model, which is the reason to choose it if that grade matters to you in the Ultra lineup. On the other side, the listing carries the higher listed price between the two Ultra options, even though the core battery capacity and AC output specs are the same as the other Ultra listing. If the certified-refurbished grade is your priority, this is the direct pick.
EcoFlow DELTA Pro Ultra 12kWh LiFePo4 Power Station, Whole Home Power-cut Backup
The whole-home version of the DELTA Pro Ultra is the lower-priced of the two Ultra listings in this set. It offers the same 6144Wh base capacity, LFP chemistry, and expansion path to 90kWh as the certified-refurbished Ultra, and the condition is described as very good - refurbished. That condition grade is the main trade-off here: you're getting the Ultra's whole-home backup capability at a lower listed price, but the refurbishment grade is not the certified label tied to the higher-priced Ultra listing. It's a reasonable choice if you want the Ultra's capacity and output without going to the top of the price range.
Final recommendation by use case
- If you're pairing a generator with a DELTA Pro battery and want the lower listed price, the certified-refurbished SG4000 for DELTA Pro series at USD 1,261.25 is the one to consider. If new condition matters more to you, the SG4000 for Home Power Backup at USD 1,573.75 is the other SG4000 route.
- If you're looking for whole-home battery backup and want to keep the listed price down, the DELTA Pro Ultra 12kWh Whole Home Power-cut Backup at USD 4,799.00 gives you the Ultra's 6144Wh base and expansion path. If the certified-refurbished grade is worth the higher listed price, the certified-refurbished Ultra at USD 4,999.00 is the alternative.
