---
title: "BYD Battery-Box Premium HVS 12.8 vs FoxESS HS12.5 - Battery Comparison | ComparePV"
description: "Compare BYD Battery-Box Premium HVS 12.8 vs FoxESS HS12.5 side by side: shop prices, usable energy, round-trip efficiency, power, cycle life and the full specification."
source: "https://comparepv.com/compare-batteries/byd-battery-box-premium-hvs-12-8/foxess-hs12-5"
updated: 2026-01-11
---

# BYD Battery-Box Premium HVS 12.8 vs FoxESS HS12.5

HS12.5 leads on the differences that matter

The largest is usable energy: 0.89 kWh apart. 5 of 14 comparable parameters are identical, with 19 more left out because at least one datasheet does not publish them.


## The two batteries


| Attribute | A | B |
| --- | --- | --- |
| Battery | [BYD Battery-Box Premium HVS 12.8](https://comparepv.com/battery/byd-battery-box-premium-hvs-12-8) | [FoxESS HS12.5](https://comparepv.com/battery/foxess-hs12-5) |
| Manufacturer | BYD | FoxESS |
| Usable energy | 12.8 kWh | 11.91 kWh |
| Cells and voltage | LFP HV | LFP HV |


## Price offers


| Shop | Country | Battery-Box Premium HVS 12.8 | HS12.5 |
| --- | --- | --- | --- |
| Solaris Energy | Poland | 21 370 zł |  |

[See 114 BYD offers](https://comparepv.com/offers?manufacturer=byd&product_type=battery)

[See 21 FoxESS offers](https://comparepv.com/offers?manufacturer=foxess&product_type=battery)


## Where they differ

Ranked by how much the difference matters, not by datasheet order.


| Parameter | Battery-Box Premium HVS 12.8 | HS12.5 | Difference |
| --- | --- | --- | --- |
| Usable energy | 12.80 kWh | 11.91 kWh | 0.89 kWh apart |
| Max system capacity | 12.8 kWh | 19.6 kWh | +6.8 kWh for HS12.5 |
| Nominal energy | 12.80 kWh | 12.28 kWh | 0.52 kWh apart |
| Nominal voltage | 512 V | 256 V | 256 V apart |
| Cycle test depth | 100 % | 80 % | 20 pp apart |
| Max operating temperature | 50 °C | 55 °C | +5 °C for HS12.5 |
| Ingress protection | IP55 | IP21 | IP55 vs IP21 |
| Modules per stack | 2-5 | 2-8 | 2-5 vs 2-8 |
| Operating voltage | 400-600 V | 216-292 V | 400-600 V vs 216-292 V |


## Every compared parameter


| Parameter | Battery-Box Premium HVS 12.8 | HS12.5 |
| --- | --- | --- |
| Usable energy | 12.80 kWh | 11.91 kWh |
| Nominal energy | 12.80 kWh | 12.28 kWh |
| Depth of discharge | 100 % | - |
| Max system capacity | 12.8 kWh | 19.6 kWh |
| Modules per stack | 2-5 | 2-8 |
| Continuous discharge power | 12.80 kW | - |
| Continuous charge power | 12.80 kW | - |
| Peak discharge power | 25.60 kW | - |
| Power per kWh | 1.00 kW/kWh | - |
| Round-trip efficiency | 96.0 % | - |
| Cycle life | - | 6000 cycles |
| Cycle test depth | 100 % | 80 % |
| Capacity at end of life | - | - |
| Self-discharge | - | - |
| Voltage class | High voltage | High voltage |
| Nominal voltage | 512 V | 256 V |
| Operating voltage | 400-600 V | 216-292 V |
| Cell chemistry | LFP | LFP |
| Active cell balancing | - | - |
| Thermal management | - | - |
| Inverter | None (battery only) | None (battery only) |
| Inverter power | - | - |
| Grid connection | - | - |
| Backup power | - | - |
| Weight | 205.0 kg | - |
| Weight per kWh | 16.0 kg/kWh | - |
| Dimensions | 1461x585x298 mm | - |
| Ingress protection | IP55 | IP21 |
| Outdoor-rated | Yes | - |
| Min operating temperature | -10 °C | -10 °C |
| Max operating temperature | 50 °C | 55 °C |
| Warranty | 10 yrs | 10 yrs |
| Warranted throughput | - | - |


## Related comparisons

- [BYD Battery-Box Premium HVS 12.8 vs Pylontech Force H2 (FH9637M)](https://comparepv.com/compare-batteries/byd-battery-box-premium-hvs-12-8/pylontech-force-h2-fh9637m) - 10 differences, the largest is nominal energy
- [BYD Battery-Box Premium HVS 12.8 vs FoxESS ECS2900-H5](https://comparepv.com/compare-batteries/byd-battery-box-premium-hvs-12-8/fox-ess-ecs2900-h5) - 15 differences, the largest is usable energy
- [BYD Battery-Box Premium HVS 12.8 vs SMA Home Storage 13.1](https://comparepv.com/compare-batteries/byd-battery-box-premium-hvs-12-8/sma-solar-technology-ag-sma-home-storage-13-1) - 13 differences, the largest is usable energy
- [FoxESS HS12.5 vs Solplanet Ai-HB 125A](https://comparepv.com/compare-batteries/foxess-hs12-5/solplanet-ai-hb-125a) - 8 differences, the largest is usable energy
- [FoxESS HS12.5 vs FoxESS ECS4300H-H3](https://comparepv.com/compare-batteries/foxess-hs12-5/fox-ess-ecs4300h-h3) - 9 differences, the largest is usable energy
- [FoxESS HS12.5 vs Pylontech Force H1 (5 modules)](https://comparepv.com/compare-batteries/foxess-hs12-5/pylontech-force-h1-5-modules) - 7 differences, the largest is usable energy


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Source: https://comparepv.com/compare-batteries/byd-battery-box-premium-hvs-12-8/foxess-hs12-5

Not in this file, on the page: a written summary generated on request.