---
title: "FoxESS ECS4300H-H3 vs FoxESS HS12.5 - Battery Comparison | ComparePV"
description: "Compare FoxESS ECS4300H-H3 vs FoxESS HS12.5 side by side: usable energy, round-trip efficiency, power, cycle life and the full specification."
source: "https://comparepv.com/compare-batteries/fox-ess-ecs4300h-h3/foxess-hs12-5"
updated: 2026-01-11
---

# FoxESS ECS4300H-H3 vs FoxESS HS12.5

ECS4300H-H3 leads on the differences that matter

The largest is usable energy: 0.71 kWh apart. 5 of 14 comparable parameters are identical, with 19 more left out because at least one datasheet does not publish them.


## The two batteries


| Attribute | A | B |
| --- | --- | --- |
| Battery | [FoxESS ECS4300H-H3](https://comparepv.com/battery/fox-ess-ecs4300h-h3) | [FoxESS HS12.5](https://comparepv.com/battery/foxess-hs12-5) |
| Manufacturer | FoxESS | FoxESS |
| Usable energy | 11.2 kWh | 11.91 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 | ECS4300H-H3 | HS12.5 | Difference |
| --- | --- | --- | --- |
| Usable energy | 11.20 kWh | 11.91 kWh | 0.71 kWh apart |
| Max system capacity | 29.0 kWh | 19.6 kWh | +9.4 kWh for ECS4300H-H3 |
| Nominal voltage | 173 V | 256 V | 83 V apart |
| Min operating temperature | -20 °C | -10 °C | -10 °C for ECS4300H-H3 |
| Nominal energy | 12.44 kWh | 12.28 kWh | 0.16 kWh apart |
| Cycle test depth | 90 % | 80 % | 10 pp apart |
| Ingress protection | IP65 | IP21 | IP65 vs IP21 |
| Modules per stack | 2-7 | 2-8 | 2-7 vs 2-8 |
| Operating voltage | 145.8-197.1 V | 216-292 V | 145.8-197.1 V vs 216-292 V |


## Every compared parameter


| Parameter | ECS4300H-H3 | HS12.5 |
| --- | --- | --- |
| Usable energy | 11.20 kWh | 11.91 kWh |
| Nominal energy | 12.44 kWh | 12.28 kWh |
| Depth of discharge | 90 % | - |
| Max system capacity | 29.0 kWh | 19.6 kWh |
| Modules per stack | 2-7 | 2-8 |
| Continuous discharge power | - | - |
| Continuous charge power | - | - |
| Peak discharge power | - | - |
| Power per kWh | - | - |
| Round-trip efficiency | 95.0 % | - |
| Cycle life | 6000 cycles | 6000 cycles |
| Cycle test depth | 90 % | 80 % |
| Capacity at end of life | - | - |
| Self-discharge | - | - |
| Voltage class | High voltage | High voltage |
| Nominal voltage | 173 V | 256 V |
| Operating voltage | 145.8-197.1 V | 216-292 V |
| Cell chemistry | LFP | LFP |
| Active cell balancing | - | - |
| Thermal management | - | - |
| Inverter | None (battery only) | None (battery only) |
| Inverter power | - | - |
| Grid connection | - | - |
| Backup power | - | - |
| Weight | 115.5 kg | - |
| Weight per kWh | 10.3 kg/kWh | - |
| Dimensions | 494x570x380 mm | - |
| Ingress protection | IP65 | IP21 |
| Outdoor-rated | Yes | - |
| Min operating temperature | -20 °C | -10 °C |
| Max operating temperature | 55 °C | 55 °C |
| Warranty | - | 10 yrs |
| Warranted throughput | - | - |


## Related comparisons

- [FoxESS ECS4300H-H3 vs Pylontech Force H1 (5 modules)](https://comparepv.com/compare-batteries/fox-ess-ecs4300h-h3/pylontech-force-h1-5-modules) - 7 differences, the largest is nominal voltage
- [FoxESS ECS4300H-H3 vs BYD Battery-Box Premium HVM 11.0](https://comparepv.com/compare-batteries/fox-ess-ecs4300h-h3/byd-battery-box-premium-hvm-11-0) - 9 differences, the largest is usable energy
- [FoxESS ECS4300H-H3 vs Deye GB-L12](https://comparepv.com/compare-batteries/fox-ess-ecs4300h-h3/gb-l12) - 10 differences, the largest is usable energy
- [FoxESS HS12.5 vs Solplanet Ai-HB 125A](https://comparepv.com/compare-batteries/foxess-hs12-5/solplanet-ai-hb-125a) - 8 differences, the largest is usable energy


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Source: https://comparepv.com/compare-batteries/fox-ess-ecs4300h-h3/foxess-hs12-5

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