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EcoFlow OCEAN 2 LFP Battery 5kWh vs Marstek Venus E 3.0

Usable capacity: EcoFlow OCEAN 2 LFP Battery 5kWh 4.87 kWh, Marstek Venus E 3.0 –. The EcoFlow OCEAN 2 LFP Battery 5kWh is better on 2 of 7 comparable points.

Who wins where

  • EcoFlow OCEAN 2 LFP Battery 5kWh
  • Marstek Venus E 3.0
GeneralPerformanceElectricalDimensions & weight
General: EcoFlow OCEAN 2 LFP Battery 5kWh 50, Marstek Venus E 3.0 50; Performance: EcoFlow OCEAN 2 LFP Battery 5kWh 42, Marstek Venus E 3.0 44; Electrical: EcoFlow OCEAN 2 LFP Battery 5kWh 50, Marstek Venus E 3.0 50; Dimensions & weight: EcoFlow OCEAN 2 LFP Battery 5kWh 77, Marstek Venus E 3.0 73

Biggest differences

FactOCEAN 2 LFP Battery 5kWhVenus E 3.0
Discharge power (continuous)3.4 kW2.5 kW
Weight46 kg60 kg
All specifications ↓

Score per area = position (0–100) relative to all 39 models in this category; higher is better.

Technical specifications EcoFlowOCEAN 2 LFP Battery 5kWh MarstekVenus E 3.0
General
Cell chemistry LFP 1 LFP 2
Wi-Fi / app Yes 1 Yes 2
Performance
Usable capacity 4.87 kWh 1 –
Nominal capacity 5.02 kWh 1 5.12 kWh ✓ 2
Charge power (continuous) 2.5 kW 1 2.5 kW 2
Discharge power (continuous) 3.4 kW ✓ 1 2.5 kW 2
Peak power 4.08 kW 1 –
Efficiency
Depth of discharge – 90 % 2
Electrical
Coupling DC-coupled 1 AC-coupled 2
Backup power Yes 1 Yes 2
Dimensions & weight
IP rating IP66 1 IP65 2
Min. operating temperature -20 °C 1 -20 °C 2
Width 680 mm 1 –
Height 279 mm 1 624 mm 2
Depth 196 mm 1 –
Weight 46 kg ✓ 1 60 kg 2
Warranty & lifespan
Warranted cycles – 6,000 2

Sources

  1. EcoFlow OCEAN 2 Three-Phase – Datasheet (EN), Datasheet_EN, PDF van 08.09.2026 — EcoFlow Inc. · accessed 27 Sept 2026
  2. MARSTEK VENUS-E (MST-BIE5-2500) – User Manual, 5. Technical Specifications, 2025-05-08 (PDF september 2025) — Marstek Energy Co., Limited · accessed 27 Sept 2026