---
title: "FoxESS ECS2900-H6 vs Sigenergy SigenStor BAT 8.0 system (2 modules) - Battery Comparison | ComparePV"
description: "Compare FoxESS ECS2900-H6 vs Sigenergy SigenStor BAT 8.0 system (2 modules) side by side: usable energy, round-trip efficiency, power, cycle life and the full specification."
source: "https://comparepv.com/compare-batteries/fox-ess-ecs2900-h6/sigenergy-sigenstor-bat-8-0-system-2-modules"
updated: 2026-01-11
---

# FoxESS ECS2900-H6 vs Sigenergy SigenStor BAT 8.0 system (2 modules)

SigenStor BAT 8.0 system (2 modules) leads on the differences that matter

The largest is max system capacity: 28.2 kWh more room to expand. 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 | [FoxESS ECS2900-H6](https://comparepv.com/battery/fox-ess-ecs2900-h6) | [Sigenergy SigenStor BAT 8.0 system (2 modules)](https://comparepv.com/battery/sigenergy-sigenstor-bat-8-0-system-2-modules) |
| Manufacturer | FoxESS | Sigenergy |
| Usable energy | 15.55 kWh | 15.6 kWh |
| Cells and voltage | LFP HV | LFP |

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

[See 15 Sigenergy offers](https://comparepv.com/offers?manufacturer=sigenergy&product_type=battery)


## Where they differ

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


| Parameter | ECS2900-H6 | SigenStor BAT 8.0 system (2 modules) | Difference |
| --- | --- | --- | --- |
| Max system capacity | 20.2 kWh | 48.4 kWh | +28.2 kWh for SigenStor BAT 8.0 system (2 modules) |
| Nominal energy | 17.28 kWh | 16.12 kWh | 1.16 kWh apart |
| Weight | 196.3 kg | 164.0 kg | -32.3 kg for SigenStor BAT 8.0 system (2 modules) |
| Weight per kWh | 12.6 kg/kWh | 10.5 kg/kWh | -2.1 kg/kWh for SigenStor BAT 8.0 system (2 modules) |
| Usable energy | 15.55 kWh | 15.60 kWh | 0.05 kWh apart |
| Inverter | None (battery only) | Built in (all-in-one) | None (battery only) vs Built in (all-in-one) |
| Ingress protection | IP65 | IP66 | IP65 vs IP66 |
| Modules per stack | 2-7 | 1-6 | 2-7 vs 1-6 |
| Dimensions | 830x570x380 mm | 910x850x260 mm | 830x570x380 mm vs 910x850x260 mm |


## Every compared parameter


| Parameter | ECS2900-H6 | SigenStor BAT 8.0 system (2 modules) |
| --- | --- | --- |
| Usable energy | 15.55 kWh | 15.60 kWh |
| Nominal energy | 17.28 kWh | 16.12 kWh |
| Depth of discharge | 90 % | - |
| Max system capacity | 20.2 kWh | 48.4 kWh |
| Modules per stack | 2-7 | 1-6 |
| Continuous discharge power | - | 8.00 kW |
| Continuous charge power | - | 8.00 kW |
| Peak discharge power | - | 12.00 kW |
| Power per kWh | - | 0.51 kW/kWh |
| Round-trip efficiency | 95.0 % | - |
| Cycle life | 6000 cycles | - |
| Cycle test depth | 90 % | - |
| Capacity at end of life | - | - |
| Self-discharge | - | - |
| Voltage class | High voltage | - |
| Nominal voltage | 346 V | - |
| Operating voltage | 291.6-394.2 V | - |
| Cell chemistry | LFP | LFP |
| Active cell balancing | - | - |
| Thermal management | - | - |
| Inverter | None (battery only) | Built in (all-in-one) |
| Inverter power | - | - |
| Grid connection | - | - |
| Backup power | - | - |
| Weight | 196.3 kg | 164.0 kg |
| Weight per kWh | 12.6 kg/kWh | 10.5 kg/kWh |
| Dimensions | 830x570x380 mm | 910x850x260 mm |
| Ingress protection | IP65 | IP66 |
| Outdoor-rated | Yes | - |
| Min operating temperature | -20 °C | -20 °C |
| Max operating temperature | 55 °C | 55 °C |
| Warranty | - | - |
| Warranted throughput | - | - |


## Related comparisons

- [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 Solplanet Ai-HB 175A](https://comparepv.com/compare-batteries/fox-ess-ecs2900-h6/solplanet-ai-hb-175a) - 10 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
- [Sigenergy SigenStor BAT 8.0 system (2 modules) vs Sigenergy SigenStor BAT stack (2 modules)](https://comparepv.com/compare-batteries/sigenergy-sigenstor-bat-8-0-system-2-modules/sigenergy-sigenstor-bat-stack-2-modules) - 3 differences, the largest is usable energy


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Source: https://comparepv.com/compare-batteries/fox-ess-ecs2900-h6/sigenergy-sigenstor-bat-8-0-system-2-modules

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