Two big home backup boxes around 3 kWh. BLUETTI is the expandable 120/240 V hub with far more solar input. EcoFlow stores more energy in a lighter box for less money.
BLUETTI Apex 300
- Capacity2764.8 Wh
- AC output3840 W
- Weight83.8 lb
- Cycles6,000
EcoFlow DELTA 3 Ultra
- Capacity3072 Wh
- AC output3600 W
- Weight72.1 lb
- Cyclesn/a
Main differences
Full manufacturer wording
| Spec | BLUETTI Apex 300 | EcoFlow DELTA 3 Ultra |
|---|---|---|
| Capacity | 2,764.8 Wh | 3,072 Wh |
| AC output | 3,840 W total AC (120/240 V); Lifting Power 7,680 W; 4× 20 A, 1× TT-30R, 1× NEMA 14-50R | 3,600 W total AC (120 V, surge 7,200 W); X-Boost up to 4,600 W; 4× 20 A, 1× 30 A |
| Weight | About 83.8 lb (38 kg) | About 72.1 lb (32.7 kg) |
| Chemistry | LiFePO4 | LFP (LiFePO4) |
| Cycle life (mfr.) | 6,000+ cycles to 80% | n/a |
| Max solar input | 2,400 W max (2× 1,200 W, 12–60 V, 20 A each) | 800 W max |
| Expandable | Yes — up to 6× B300K / B300S / B300 batteries per unit | No — expansion is on DELTA 3 Ultra Plus only (US spec table) |
| Charge temp. | 32–104°F (0–40°C) | 32–113°F (0–45°C) |
| Discharge temp. | −4–104°F (−20–40°C) | 14–113°F (−10–45°C) |
| Warranty (mfr. copy) | 5 years | 5 years (3 standard + 2 with app registration) |
Capacity and price
DELTA 3 Ultra stores 3072 Wh, about 11% more than the 2764.8 Wh in Apex 300. On the brand stores on our check date, DELTA 3 Ultra listed at $1,299 (was $1,599) and Apex 300 at $1,499 (was $1,699). That is roughly 42¢ versus 54¢ per Wh. Prices move often, so check both before you buy.
Output
Apex 300 rates 3840 W in total across four 20 A outlets, a TT-30R and a NEMA 14-50R that supplies 120/240 V, with Lifting Power to 7680 W on compatible loads. DELTA 3 Ultra rates 3600 W at 120 V across four 20 A outlets and one 30 A outlet, with a 7200 W surge and X-Boost to 4600 W. DELTA 3 Ultra builds in a 140 W USB-C, two 45 W USB-C, a USB-A and a 12 V car outlet; on Apex 300 the USB-C, USB-A and 12 V ports need the separate Hub D1. UPS switchover: BLUETTI claims 0 ms, EcoFlow lists <10 ms.
Charging and solar
Wall charging: both list 1800 W max AC input on a 120 V 15 A circuit. DELTA 3 Ultra lists 0–80% in about 89 min on the wall. Apex 300 lists Turbo charging up to 3840 W combined (80% in 45 min). Solar is the biggest split: BLUETTI accepts 2400 W across two 1200 W inputs (12–60 V); EcoFlow accepts 800 W. Apex 300 also takes up to six B300-series add-on batteries; DELTA 3 Ultra has no expansion (that is the Ultra Plus).
Weight, cold and warranty
Apex 300: about 83.8 lb (38 kg), 20.67 × 12.87 × 12.6 in. DELTA 3 Ultra: about 72.1 lb (32.7 kg), about 24.6 × 12.9 × 15.5 in. Apex 300 discharges down to −4°F and charges from 32°F to 104°F. DELTA 3 Ultra discharges down to 14°F and charges from 32°F to 113°F. BLUETTI lists 6000+ cycles to 80%; EcoFlow does not publish a cycle count on the US page. Both list 5 years of warranty (EcoFlow’s last 2 years need app registration).
BLUETTI Apex 300 — official storeAmazon search
EcoFlow DELTA 3 Ultra — official storeAmazon search
Sources
BLUETTI US Apex 300 product page tech specs. EcoFlow US DELTA 3 Ultra (3072Wh) product page spec table. Checked 9 November 2026.