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.
Both models in detail
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 140 models in this category; higher is better.
| Technical specifications | BYDBattery-Box Premium HVS 5.1 | EnphaseIQ Battery 5P with FlexPhase |
|---|---|---|
| General | ||
| Cell chemistry | LFP1 | LFP2 |
| Wi-Fi / app | – | Yes2 |
| Performance | ||
| Usable capacity | 5.12 kWh✓1 | 5 kWh2 |
| Expandable up to | 38.4 kWh1 | – |
| Efficiency | ||
| Round-trip efficiency | 96 %✓1 | 90 %2 |
| Electrical | ||
| Coupling | – | AC-coupled2 |
| Phases | – | 32 |
| Backup power | Yes1 | Yes2 |
| Off-grid capable | Yes1 | – |
| Dimensions & weight | ||
| IP rating | IP551 | IP552 |
| Min. operating temperature | -10 °C1 | -20 °C✓2 |
| Width | 585 mm1 | 550 mm2 |
| Height | 762 mm1 | 980 mm2 |
| Depth | 298 mm1 | 188 mm2 |
| Weight | 91 kg1 | 83 kg✓2 |
| Warranty & lifespan | ||
| Warranted cycles | – | 6,0002 |
| Warranty | 10 years1 | 15 years✓2 |
Frequently asked questions
Which is better: the BYD Battery-Box Premium HVS 5.1 or the 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.
What is the usable capacity of the BYD Battery-Box Premium HVS 5.1 and the Enphase IQ Battery 5P with FlexPhase?
BYD Battery-Box Premium HVS 5.1: 5.12 kWh. Enphase IQ Battery 5P with FlexPhase: 5 kWh.
Which is better on min. operating temperature: the BYD Battery-Box Premium HVS 5.1 or the Enphase IQ Battery 5P with FlexPhase?
Enphase IQ Battery 5P with FlexPhase: -20 °C. BYD Battery-Box Premium HVS 5.1: -10 °C.
Which is better on warranty: the BYD Battery-Box Premium HVS 5.1 or the Enphase IQ Battery 5P with FlexPhase?
Enphase IQ Battery 5P with FlexPhase: 15 years. BYD Battery-Box Premium HVS 5.1: 10 years.
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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
- IQ Battery 5P with FlexPhase – EMEA data sheet, DSH-00477-9.0-EN-2026-08-21 — Enphase Energy, Inc. · accessed 27 Sept 2026