---
title: "FoxESS ECS2900-H3 vs Sigenergy SigenStor BAT stack (1 module) - Battery Comparison | ComparePV"
description: "Compare FoxESS ECS2900-H3 vs Sigenergy SigenStor BAT stack (1 module) side by side: usable energy, round-trip efficiency, power, cycle life and the full specification."
source: "https://comparepv.com/compare-batteries/fox-ess-ecs2900-h3/sigenergy-sigenstor-bat-stack-1-module"
updated: 2026-01-11
---

# FoxESS ECS2900-H3 vs Sigenergy SigenStor BAT stack (1 module)

SigenStor BAT stack (1 module) leads on the differences that matter

The largest is usable energy: 0.28 kWh apart. 4 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-H3](https://comparepv.com/battery/fox-ess-ecs2900-h3) | [Sigenergy SigenStor BAT stack (1 module)](https://comparepv.com/battery/sigenergy-sigenstor-bat-stack-1-module) |
| Manufacturer | FoxESS | Sigenergy |
| Usable energy | 7.78 kWh | 8.06 kWh |
| Cells and voltage | LFP HV | LFP |

[See 31 FoxESS offers](https://comparepv.com/offers?manufacturer=foxess&product_type=battery)

[See 11 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-H3 | SigenStor BAT stack (1 module) | Difference |
| --- | --- | --- | --- |
| Usable energy | 7.78 kWh | 8.06 kWh | 0.28 kWh apart |
| Max system capacity | 20.2 kWh | 48.4 kWh | +28.2 kWh for SigenStor BAT stack (1 module) |
| Nominal energy | 8.64 kWh | 8.06 kWh | 0.58 kWh apart |
| Weight | 100.3 kg | 91.0 kg | -9.3 kg for SigenStor BAT stack (1 module) |
| Weight per kWh | 12.9 kg/kWh | 11.3 kg/kWh | -1.6 kg/kWh for SigenStor BAT stack (1 module) |
| Ingress protection | IP65 | IP66 | IP65 vs IP66 |
| Modules per stack | 2-7 | 1-6 | 2-7 vs 1-6 |
| Dimensions | 470x570x380 mm | 640x850x260 mm | 470x570x380 mm vs 640x850x260 mm |


## Every compared parameter


| Parameter | ECS2900-H3 | SigenStor BAT stack (1 module) |
| --- | --- | --- |
| Usable energy | 7.78 kWh | 8.06 kWh |
| Nominal energy | 8.64 kWh | 8.06 kWh |
| Depth of discharge | 90 % | - |
| Max system capacity | 20.2 kWh | 48.4 kWh |
| Modules per stack | 2-7 | 1-6 |
| Continuous discharge power | - | 4.00 kW |
| Continuous charge power | - | 4.00 kW |
| Peak discharge power | - | 6.00 kW |
| Power per kWh | - | 0.50 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 | 173 V | - |
| Operating voltage | 145.8-197.1 V | - |
| Cell chemistry | LFP | LFP |
| Active cell balancing | - | - |
| Thermal management | - | - |
| Inverter | None (battery only) | None (battery only) |
| Inverter power | - | - |
| Grid connection | - | - |
| Backup power | - | - |
| Weight | 100.3 kg | 91.0 kg |
| Weight per kWh | 12.9 kg/kWh | 11.3 kg/kWh |
| Dimensions | 470x570x380 mm | 640x850x260 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-H3 vs Sigenergy SigenStor BAT 8.0](https://comparepv.com/compare-batteries/fox-ess-ecs2900-h3/sigenergy-sigenstor-bat-8-0) - 10 differences, the largest is max system capacity
- [FoxESS ECS2900-H3 vs BYD Battery-Box Premium HVS 7.7](https://comparepv.com/compare-batteries/fox-ess-ecs2900-h3/byd-battery-box-premium-hvs-7-7) - 15 differences, the largest is max system capacity
- [FoxESS ECS2900-H3 vs FoxESS ECS4300H-H2](https://comparepv.com/compare-batteries/fox-ess-ecs2900-h3/fox-ess-ecs4300h-h2) - 8 differences, the largest is usable energy
- [Sigenergy SigenStor BAT stack (1 module) vs Huawei LUNA2000-7-S1](https://comparepv.com/compare-batteries/sigenergy-sigenstor-bat-stack-1-module/huawei-luna2000-7-s1) - 9 differences, the largest is usable energy
- [Sigenergy SigenStor BAT stack (1 module) vs BYD Battery-Box Premium HVM 8.3](https://comparepv.com/compare-batteries/sigenergy-sigenstor-bat-stack-1-module/byd-battery-box-premium-hvm-8-3) - 6 differences, the largest is usable energy


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Source: https://comparepv.com/compare-batteries/fox-ess-ecs2900-h3/sigenergy-sigenstor-bat-stack-1-module

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