Technical Specifications
| Brand | EcoFlow |
| Model | Delta 2 |
| Price | $999 |
| AC Output | 1024 W |
| Capacity | 1024 Wh |
| Battery Chemistry | LFP |
| Cycle Life | 3000 cycles |
| AC Charge Time | 1.6 h |
| Weight | 12 kg |
EcoFlow Delta 2: Technical Specifications and Performance Review
Core Electrical Specifications
The EcoFlow Delta 2 is a 1024Wh lithium iron phosphate (LFP) portable power station rated at 1800W continuous AC output with a 2700W surge capacity. LFP chemistry delivers approximately 3,000 charge cycles to 80% capacity — a measurable durability advantage over NMC-based competitors at comparable price points.
Key electrical parameters:
- Capacity: 1024Wh (usable)
- AC Output: 1800W continuous, 2700W surge
- AC Charge Time: approximately 1.6 hours (0–80% in under 1 hour with X-Stream charging)
- Solar Input: 500W maximum, 11–60V input voltage range, 15A maximum current
- MPPT Efficiency: >99% (rated)
- Output Waveform: Pure sine wave, THD <3%
- Weight: 12.0 kg
Solar Input Specifications: 11-60V, 15A, 500W
This is the specification that determines panel compatibility. The Delta 2’s MPPT controller accepts:
- Input voltage window: 11–60V (Voc must remain below 60V under all conditions)
- Maximum input current: 15A
- Maximum solar input power: 500W
Practical panel configuration: Two 200W panels in series produce a combined Voc of approximately 48–50V and Vmp around 40V — within the MPPT window and close to optimal efficiency. A single 400W panel with Voc around 49.6V also falls within the safe range.
Critical constraint: Cold temperatures increase Voc. In sub-zero conditions, a panel rated at 49.6V Voc at 25°C may exceed the 60V ceiling. Always calculate worst-case Voc using the panel’s temperature coefficient before wiring in series.
Real-World Off-Grid Use Cases
Camping and Van Life
At 1024Wh usable capacity, the Delta 2 sustains realistic off-grid loads:
- 50W compressor refrigerator: ~18 hours
- 65W laptop: ~13 hours
- CPAP device (30W, DC mode): ~28 hours
- LED lighting (10W): ~80 hours
With 500W solar input, a full recharge from 20% under strong irradiance (900–1000 W/m²) takes approximately 2.5–3 hours.
Emergency Home Backup
The Delta 2 covers essential loads during outages: refrigerator, lighting, phone charging, and router simultaneously for 6–10 hours depending on draw. It does not support split-phase 240V loads or whole-home backup.
ROI Analysis
At $999 USD, the Delta 2’s cost-per-watt-hour is approximately $0.98/Wh. Compared to generator fuel costs averaging $0.40–0.60/kWh equivalent, payback in regular-use scenarios occurs within 1,600–2,500 kWh of displaced generation — roughly 3–5 years under weekend off-grid use. LFP chemistry supports the full payback window and beyond.
Pros and Cons
Pros
- LFP chemistry: 3,000-cycle rated lifespan
- X-Stream fast charging: 0–80% in under 1 hour
- 500W solar input with MPPT (11–60V, 15A)
- Pure sine wave AC output, THD <3%
- Expandable via EcoFlow DELTA 2 Extra Battery add-on
Cons
- 60V Voc ceiling restricts series panel configurations in cold climates
- 1800W continuous output insufficient for high-draw loads above 15A
- Single 30A output ceiling limits simultaneous high-draw appliances
Related Reviews
Looking for more off-grid power solutions? Check out these technical deep-dives: