---
title: "FoxESS ECS2900-H3 vs Sigenergy SigenStor BAT 8.0 - Battery Comparison | ComparePV"
description: "Compare FoxESS ECS2900-H3 vs Sigenergy SigenStor BAT 8.0 side by side: shop prices, 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-8-0"
updated: 2026-01-11
---

# FoxESS ECS2900-H3 vs Sigenergy SigenStor BAT 8.0

SigenStor BAT 8.0 leads on the differences that matter

The largest is max system capacity: 28.2 kWh more room to expand. 5 of 15 comparable parameters are identical, with 18 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 8.0](https://comparepv.com/battery/sigenergy-sigenstor-bat-8-0) |
| Manufacturer | FoxESS | Sigenergy |
| Usable energy | 7.78 kWh | 7.8 kWh |
| Cells and voltage | LFP HV | LFP HV |


## Price offers


| Shop | Country | ECS2900-H3 | SigenStor BAT 8.0 |
| --- | --- | --- | --- |
| solarbatterysupermarket.com.au | Australia |  | 3 895 A$ |

[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 8.0 | Difference |
| --- | --- | --- | --- |
| Max system capacity | 20.2 kWh | 48.4 kWh | +28.2 kWh for SigenStor BAT 8.0 |
| Nominal energy | 8.64 kWh | 8.06 kWh | 0.58 kWh apart |
| Weight | 100.3 kg | 73.0 kg | -27.3 kg for SigenStor BAT 8.0 |
| Weight per kWh | 12.9 kg/kWh | 9.4 kg/kWh | -3.5 kg/kWh for SigenStor BAT 8.0 |
| Cycle test depth | 90 % | 100 % | 10 pp 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 |
| Operating voltage | 145.8-197.1 V | 300-600 V | 145.8-197.1 V vs 300-600 V |
| Dimensions | 470x570x380 mm | 270x767x260 mm | 470x570x380 mm vs 270x767x260 mm |


## Every compared parameter


| Parameter | ECS2900-H3 | SigenStor BAT 8.0 |
| --- | --- | --- |
| Usable energy | 7.78 kWh | 7.80 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 | - | 0.51 kW/kWh |
| Round-trip efficiency | 95.0 % | - |
| Cycle life | 6000 cycles | - |
| Cycle test depth | 90 % | 100 % |
| Capacity at end of life | - | - |
| Self-discharge | - | - |
| Voltage class | High voltage | High voltage |
| Nominal voltage | 173 V | - |
| Operating voltage | 145.8-197.1 V | 300-600 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 | 100.3 kg | 73.0 kg |
| Weight per kWh | 12.9 kg/kWh | 9.4 kg/kWh |
| Dimensions | 470x570x380 mm | 270x767x260 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 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
- [FoxESS ECS2900-H3 vs Deye GB-L8](https://comparepv.com/compare-batteries/fox-ess-ecs2900-h3/gb-l8) - 9 differences, the largest is usable energy


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Source: https://comparepv.com/compare-batteries/fox-ess-ecs2900-h3/sigenergy-sigenstor-bat-8-0

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