---
title: "BYD Battery-Box Premium HVS 12.8 vs FoxESS ECS2900-H5 - Battery Comparison | ComparePV"
description: "Compare BYD Battery-Box Premium HVS 12.8 vs FoxESS ECS2900-H5 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/fox-ess-ecs2900-h5"
updated: 2026-01-11
---

# BYD Battery-Box Premium HVS 12.8 vs FoxESS ECS2900-H5

ECS2900-H5 leads on the differences that matter

The largest is usable energy: 0.16 kWh apart. 4 of 19 comparable parameters are identical, with 14 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 ECS2900-H5](https://comparepv.com/battery/fox-ess-ecs2900-h5) |
| Manufacturer | BYD | FoxESS |
| Usable energy | 12.8 kWh | 12.96 kWh |
| Cells and voltage | LFP HV | LFP HV |


## Price offers


| Shop | Country | Battery-Box Premium HVS 12.8 | ECS2900-H5 |
| --- | --- | --- | --- |
| Solaris Energy | Poland | 21 370 zł |  |

[See 121 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 | ECS2900-H5 | Difference |
| --- | --- | --- | --- |
| Usable energy | 12.80 kWh | 12.96 kWh | 0.16 kWh apart |
| Max system capacity | 12.8 kWh | 20.2 kWh | +7.4 kWh for ECS2900-H5 |
| Round-trip efficiency | 96.0 % | 95.0 % | +1.0 pp for Battery-Box Premium HVS 12.8 |
| Nominal energy | 12.80 kWh | 14.40 kWh | 1.60 kWh apart |
| Depth of discharge | 100 % | 90 % | +10 pp for Battery-Box Premium HVS 12.8 |
| Nominal voltage | 512 V | 288 V | 224 V apart |
| Weight | 205.0 kg | 164.3 kg | -40.7 kg for ECS2900-H5 |
| Weight per kWh | 16.0 kg/kWh | 12.7 kg/kWh | -3.3 kg/kWh for ECS2900-H5 |
| Min operating temperature | -10 °C | -20 °C | -10 °C for ECS2900-H5 |
| Cycle test depth | 100 % | 90 % | 10 pp apart |
| Max operating temperature | 50 °C | 55 °C | +5 °C for ECS2900-H5 |
| Ingress protection | IP55 | IP65 | IP55 vs IP65 |
| Modules per stack | 2-5 | 2-7 | 2-5 vs 2-7 |
| Operating voltage | 400-600 V | 243-328.5 V | 400-600 V vs 243-328.5 V |
| Dimensions | 1461x585x298 mm | 710x570x380 mm | 1461x585x298 mm vs 710x570x380 mm |


## Every compared parameter


| Parameter | Battery-Box Premium HVS 12.8 | ECS2900-H5 |
| --- | --- | --- |
| Usable energy | 12.80 kWh | 12.96 kWh |
| Nominal energy | 12.80 kWh | 14.40 kWh |
| Depth of discharge | 100 % | 90 % |
| Max system capacity | 12.8 kWh | 20.2 kWh |
| Modules per stack | 2-5 | 2-7 |
| 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 % | 95.0 % |
| Cycle life | - | 6000 cycles |
| Cycle test depth | 100 % | 90 % |
| Capacity at end of life | - | - |
| Self-discharge | - | - |
| Voltage class | High voltage | High voltage |
| Nominal voltage | 512 V | 288 V |
| Operating voltage | 400-600 V | 243-328.5 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 | 164.3 kg |
| Weight per kWh | 16.0 kg/kWh | 12.7 kg/kWh |
| Dimensions | 1461x585x298 mm | 710x570x380 mm |
| Ingress protection | IP55 | IP65 |
| Outdoor-rated | Yes | Yes |
| Min operating temperature | -10 °C | -20 °C |
| Max operating temperature | 50 °C | 55 °C |
| Warranty | 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 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
- [BYD Battery-Box Premium HVS 12.8 vs FoxESS HS12.5](https://comparepv.com/compare-batteries/byd-battery-box-premium-hvs-12-8/foxess-hs12-5) - 9 differences, the largest is usable energy
- [FoxESS ECS2900-H5 vs BYD Battery-Box Premium HVM 13.8](https://comparepv.com/compare-batteries/fox-ess-ecs2900-h5/byd-battery-box-premium-hvm-13-8) - 9 differences, the largest is usable energy


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Source: https://comparepv.com/compare-batteries/byd-battery-box-premium-hvs-12-8/fox-ess-ecs2900-h5

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