BYD Battery-Box Premium HVS 7.7 vs EcoFlow OCEAN 2 LFP Battery 8kWh
Usable capacity: BYD Battery-Box Premium HVS 7.7 7.68 kWh, EcoFlow OCEAN 2 LFP Battery 8kWh 7.76 kWh. The EcoFlow OCEAN 2 LFP Battery 8kWh is better on 3 of 4 comparable points.
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Both models in detail
Who wins where
- BYD Battery-Box Premium HVS 7.7
- EcoFlow OCEAN 2 LFP Battery 8kWh
Biggest differences
| Fact | Battery-Box Premium HVS 7.7 | OCEAN 2 LFP Battery 8kWh |
|---|---|---|
| Min. operating temperature | -10 °C | -20 °C |
| Weight | 129 kg | 67.5 kg |
Score per area = position (0–100) relative to all 140 models in this category; higher is better.
| Technical specifications | BYDBattery-Box Premium HVS 7.7 | EcoFlowOCEAN 2 LFP Battery 8kWh |
|---|---|---|
| General | ||
| Cell chemistry | LFP1 | LFP2 |
| Wi-Fi / app | – | Yes2 |
| Performance | ||
| Usable capacity | 7.68 kWh1 | 7.76 kWh✓2 |
| Nominal capacity | – | 8.03 kWh2 |
| Expandable up to | 38.4 kWh1 | – |
| Charge power (continuous) | – | 4.1 kW2 |
| Discharge power (continuous) | – | 4.1 kW2 |
| Peak power | – | 6.4 kW2 |
| Efficiency | ||
| Round-trip efficiency | 96 %1 | – |
| Electrical | ||
| Coupling | – | DC-coupled2 |
| Backup power | Yes1 | Yes2 |
| Off-grid capable | Yes1 | – |
| Dimensions & weight | ||
| IP rating | IP551 | IP662 |
| Min. operating temperature | -10 °C1 | -20 °C✓2 |
| Width | 585 mm1 | 680 mm2 |
| Height | 995 mm1 | 378 mm2 |
| Depth | 298 mm1 | 196 mm2 |
| Weight | 129 kg1 | 67.5 kg✓2 |
| Warranty & lifespan | ||
| Warranty | 10 years1 | – |
Frequently asked questions
Which is better: the BYD Battery-Box Premium HVS 7.7 or the EcoFlow OCEAN 2 LFP Battery 8kWh?
Usable capacity: BYD Battery-Box Premium HVS 7.7 7.68 kWh, EcoFlow OCEAN 2 LFP Battery 8kWh 7.76 kWh. The EcoFlow OCEAN 2 LFP Battery 8kWh is better on 3 of 4 comparable points.
What is the usable capacity of the BYD Battery-Box Premium HVS 7.7 and the EcoFlow OCEAN 2 LFP Battery 8kWh?
BYD Battery-Box Premium HVS 7.7: 7.68 kWh. EcoFlow OCEAN 2 LFP Battery 8kWh: 7.76 kWh.
Which is better on min. operating temperature: the BYD Battery-Box Premium HVS 7.7 or the EcoFlow OCEAN 2 LFP Battery 8kWh?
EcoFlow OCEAN 2 LFP Battery 8kWh: -20 °C. BYD Battery-Box Premium HVS 7.7: -10 °C.
Which is better on weight: the BYD Battery-Box Premium HVS 7.7 or the EcoFlow OCEAN 2 LFP Battery 8kWh?
EcoFlow OCEAN 2 LFP Battery 8kWh: 67.5 kg. BYD Battery-Box Premium HVS 7.7: 129 kg.
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How we collect and check this data →
Sources
- Battery-Box Premium HVS – datasheet, BCU2.0 V1.0 EN (28.03.2025) — BYD Lithium Battery Co., Ltd. · accessed 27 Sept 2026
- EcoFlow OCEAN 2 Three-Phase – Datasheet (EN), Datasheet_EN, PDF van 08.09.2026 — EcoFlow Inc. · accessed 27 Sept 2026