---
title: "BYD Battery-Box Premium HVM 16.6 vs FoxESS ECS2900-H6 - Battery Comparison | ComparePV"
description: "Compare BYD Battery-Box Premium HVM 16.6 vs FoxESS ECS2900-H6 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-hvm-16-6/fox-ess-ecs2900-h6"
updated: 2026-01-11
---

# BYD Battery-Box Premium HVM 16.6 vs FoxESS ECS2900-H6

Battery-Box Premium HVM 16.6 leads on the differences that matter

The largest is usable energy: 1.01 kWh apart. 3 of 12 comparable parameters are identical, with 21 more left out because at least one datasheet does not publish them.


## The two batteries


| Attribute | A | B |
| --- | --- | --- |
| Battery | [BYD Battery-Box Premium HVM 16.6](https://comparepv.com/battery/byd-battery-box-premium-hvm-16-6) | [FoxESS ECS2900-H6](https://comparepv.com/battery/fox-ess-ecs2900-h6) |
| Manufacturer | BYD | FoxESS |
| Usable energy | 16.56 kWh | 15.55 kWh |
| Cells and voltage | LFP HV | LFP HV |


## Price offers


| Shop | Country | Battery-Box Premium HVM 16.6 | ECS2900-H6 |
| --- | --- | --- | --- |
| Solaris Energy | Poland | 27 290 zł |  |
| www.solar-outlet.nl | Netherlands | 6 989.95 € |  |

[See 119 BYD offers](https://comparepv.com/offers?manufacturer=byd&product_type=battery)

[See 31 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 HVM 16.6 | ECS2900-H6 | Difference |
| --- | --- | --- | --- |
| Usable energy | 16.56 kWh | 15.55 kWh | 1.01 kWh apart |
| Max system capacity | 49.7 kWh | 20.2 kWh | +29.5 kWh for Battery-Box Premium HVM 16.6 |
| Round-trip efficiency | 96.0 % | 95.0 % | +1.0 pp for Battery-Box Premium HVM 16.6 |
| Nominal voltage | 307 V | 346 V | 38 V apart |
| Min operating temperature | -10 °C | -20 °C | -10 °C for ECS2900-H6 |
| Max operating temperature | 50 °C | 55 °C | +5 °C for ECS2900-H6 |
| Ingress protection | IP55 | IP65 | IP55 vs IP65 |
| Operating voltage | 240-354 V | 291.6-394.2 V | 240-354 V vs 291.6-394.2 V |
| Dimensions | 1694x585x298 mm | 830x570x380 mm | 1694x585x298 mm vs 830x570x380 mm |


## Every compared parameter


| Parameter | Battery-Box Premium HVM 16.6 | ECS2900-H6 |
| --- | --- | --- |
| Usable energy | 16.56 kWh | 15.55 kWh |
| Nominal energy | - | 17.28 kWh |
| Depth of discharge | - | 90 % |
| Max system capacity | 49.7 kWh | 20.2 kWh |
| Modules per stack | - | 2-7 |
| Continuous discharge power | - | - |
| Continuous charge power | - | - |
| Peak discharge power | - | - |
| Power per kWh | - | - |
| Round-trip efficiency | 96.0 % | 95.0 % |
| Cycle life | - | 6000 cycles |
| Cycle test depth | - | 90 % |
| Capacity at end of life | - | - |
| Self-discharge | - | - |
| Voltage class | High voltage | High voltage |
| Nominal voltage | 307 V | 346 V |
| Operating voltage | 240-354 V | 291.6-394.2 V |
| Cell chemistry | LFP | LFP |
| Active cell balancing | - | - |
| Thermal management | - | - |
| Inverter | None (battery only) | None (battery only) |
| Inverter power | - | - |
| Grid connection | - | - |
| Backup power | - | - |
| Weight | - | 196.3 kg |
| Weight per kWh | - | 12.6 kg/kWh |
| Dimensions | 1694x585x298 mm | 830x570x380 mm |
| Ingress protection | IP55 | IP65 |
| Outdoor-rated | - | 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 HVM 16.6 vs FoxESS HS17.5](https://comparepv.com/compare-batteries/byd-battery-box-premium-hvm-16-6/foxess-hs17-5) - 6 differences, the largest is usable energy
- [BYD Battery-Box Premium HVM 16.6 vs SMA Home Storage 16.4](https://comparepv.com/compare-batteries/byd-battery-box-premium-hvm-16-6/sma-solar-technology-ag-sma-home-storage-16-4) - 6 differences, the largest is usable energy
- [BYD Battery-Box Premium HVM 16.6 vs Solplanet Ai-HB 175A](https://comparepv.com/compare-batteries/byd-battery-box-premium-hvm-16-6/solplanet-ai-hb-175a) - 8 differences, the largest is usable energy
- [FoxESS ECS2900-H6 vs Huawei LUNA2000-15-S0](https://comparepv.com/compare-batteries/fox-ess-ecs2900-h6/huawei-luna2000-15-s0) - 11 differences, the largest is usable energy
- [FoxESS ECS2900-H6 vs FoxESS ECS4300H-H4](https://comparepv.com/compare-batteries/fox-ess-ecs2900-h6/fox-ess-ecs4300h-h4) - 8 differences, the largest is usable energy
- [FoxESS ECS2900-H6 vs Deye GB-L16](https://comparepv.com/compare-batteries/fox-ess-ecs2900-h6/gb-l16) - 10 differences, the largest is usable energy


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Source: https://comparepv.com/compare-batteries/byd-battery-box-premium-hvm-16-6/fox-ess-ecs2900-h6

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