BYD Battery-Box Premium HVS 5.1 vs Enphase IQ Battery 5P with FlexPhase
Usable capacity: BYD Battery-Box Premium HVS 5.1 5.12 kWh, Enphase IQ Battery 5P with FlexPhase 5 kWh. The Enphase IQ Battery 5P with FlexPhase is better on 3 of 6 comparable points.
Who wins where
- BYD Battery-Box Premium HVS 5.1
- Enphase IQ Battery 5P with FlexPhase
Biggest differences
| Fact | Battery-Box Premium HVS 5.1 | IQ Battery 5P with FlexPhase |
|---|---|---|
| Min. operating temperature | -10 °C | -20 °C |
| Warranty | 10 years | 15 years |
| Weight | 91 kg | 83 kg |
| Round-trip efficiency | 96 % | 90 % |
| Usable capacity | 5.12 kWh | 5 kWh |
Score per area = position (0–100) relative to all 39 models in this category; higher is better.
| Technical specifications | BYDBattery-Box Premium HVS 5.1 | EnphaseIQ Battery 5P with FlexPhase |
|---|---|---|
| General | ||
| Cell chemistry | LFP 1 | LFP 2 |
| Wi-Fi / app | – | Yes 2 |
| Performance | ||
| Usable capacity | 5.12 kWh ✓ 1 | 5 kWh 2 |
| Expandable up to | 38.4 kWh 1 | – |
| Efficiency | ||
| Round-trip efficiency | 96 % ✓ 1 | 90 % 2 |
| Electrical | ||
| Coupling | – | AC-coupled 2 |
| Phases | – | 3 2 |
| Backup power | Yes 1 | Yes 2 |
| Off-grid capable | Yes 1 | – |
| Dimensions & weight | ||
| IP rating | IP55 1 | IP55 2 |
| Min. operating temperature | -10 °C 1 | -20 °C ✓ 2 |
| Width | 585 mm 1 | 550 mm 2 |
| Height | 762 mm 1 | 980 mm 2 |
| Depth | 298 mm 1 | 188 mm 2 |
| Weight | 91 kg 1 | 83 kg ✓ 2 |
| Warranty & lifespan | ||
| Warranted cycles | – | 6,000 2 |
| Warranty | 10 years 1 | 15 years ✓ 2 |
Sources
- Battery-Box Premium HVS – datasheet, BCU2.0 V1.0 EN (28.03.2025) — BYD Lithium Battery Co., Ltd. · accessed 27 Sept 2026
- IQ Battery 5P with FlexPhase – EMEA data sheet, DSH-00477-9.0-EN-2026-08-21 — Enphase Energy, Inc. · accessed 27 Sept 2026