---
title: "FoxESS ECS2900-H3 vs FoxESS ECS4300H-H2 - Battery Comparison | ComparePV"
description: "Compare FoxESS ECS2900-H3 vs FoxESS ECS4300H-H2 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/fox-ess-ecs4300h-h2"
updated: 2026-01-11
---

# FoxESS ECS2900-H3 vs FoxESS ECS4300H-H2

ECS4300H-H2 leads on the differences that matter

The largest is usable energy: 0.32 kWh apart. 12 of 20 comparable parameters are identical, with 13 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) | [FoxESS ECS4300H-H2](https://comparepv.com/battery/fox-ess-ecs4300h-h2) |
| Manufacturer | FoxESS | FoxESS |
| Usable energy | 7.78 kWh | 7.46 kWh |
| Cells and voltage | LFP HV | LFP HV |

[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 | ECS2900-H3 | ECS4300H-H2 | Difference |
| --- | --- | --- | --- |
| Usable energy | 7.78 kWh | 7.46 kWh | 0.32 kWh apart |
| Max system capacity | 20.2 kWh | 29.0 kWh | +8.8 kWh for ECS4300H-H2 |
| Nominal energy | 8.64 kWh | 8.29 kWh | 0.35 kWh apart |
| Nominal voltage | 173 V | 115 V | 58 V apart |
| Weight | 100.3 kg | 78.5 kg | -21.8 kg for ECS4300H-H2 |
| Weight per kWh | 12.9 kg/kWh | 10.5 kg/kWh | -2.4 kg/kWh for ECS4300H-H2 |
| Operating voltage | 145.8-197.1 V | 97.2-131.4 V | 145.8-197.1 V vs 97.2-131.4 V |
| Dimensions | 470x570x380 mm | 366x570x380 mm | 470x570x380 mm vs 366x570x380 mm |


## Every compared parameter


| Parameter | ECS2900-H3 | ECS4300H-H2 |
| --- | --- | --- |
| Usable energy | 7.78 kWh | 7.46 kWh |
| Nominal energy | 8.64 kWh | 8.29 kWh |
| Depth of discharge | 90 % | 90 % |
| Max system capacity | 20.2 kWh | 29.0 kWh |
| Modules per stack | 2-7 | 2-7 |
| Continuous discharge power | - | - |
| Continuous charge power | - | - |
| Peak discharge power | - | - |
| Power per kWh | - | - |
| Round-trip efficiency | 95.0 % | 95.0 % |
| Cycle life | 6000 cycles | 6000 cycles |
| Cycle test depth | 90 % | 90 % |
| Capacity at end of life | - | - |
| Self-discharge | - | - |
| Voltage class | High voltage | High voltage |
| Nominal voltage | 173 V | 115 V |
| Operating voltage | 145.8-197.1 V | 97.2-131.4 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 | 78.5 kg |
| Weight per kWh | 12.9 kg/kWh | 10.5 kg/kWh |
| Dimensions | 470x570x380 mm | 366x570x380 mm |
| Ingress protection | IP65 | IP65 |
| Outdoor-rated | Yes | 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 Deye GB-L8](https://comparepv.com/compare-batteries/fox-ess-ecs2900-h3/gb-l8) - 9 differences, the largest is usable energy
- [FoxESS ECS4300H-H2 vs Deye GB-SL-EU (2 modules in series)](https://comparepv.com/compare-batteries/fox-ess-ecs4300h-h2/gb-sl-eu-2-modules-in-series) - 11 differences, the largest is max system capacity
- [FoxESS ECS4300H-H2 vs Dyness Tower Pro TP7](https://comparepv.com/compare-batteries/fox-ess-ecs4300h-h2/dyness-tower-pro-tp7) - 13 differences, the largest is usable energy


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Source: https://comparepv.com/compare-batteries/fox-ess-ecs2900-h3/fox-ess-ecs4300h-h2

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