--- title: "Deye BOS-G35 vs FoxESS ECS4300H-H7 - Battery Comparison | ComparePV" description: "Compare Deye BOS-G35 vs FoxESS ECS4300H-H7 side by side: usable energy, round-trip efficiency, power, cycle life and the full specification." source: "https://comparepv.com/compare-batteries/bos-g35/fox-ess-ecs4300h-h7" updated: 2026-01-11 --- # Deye BOS-G35 vs FoxESS ECS4300H-H7 10 differences, and they point both ways The largest is usable energy: 6.12 kWh apart. 8 of 18 comparable parameters are identical, with 15 more left out because at least one datasheet does not publish them. ## The two batteries | Attribute | A | B | | --- | --- | --- | | Battery | [Deye BOS-G35](https://comparepv.com/battery/bos-g35) | [FoxESS ECS4300H-H7](https://comparepv.com/battery/fox-ess-ecs4300h-h7) | | Manufacturer | Deye | FoxESS | | Usable energy | 32.25 kWh | 26.13 kWh | | Cells and voltage | LFP HV | LFP HV | [See 44 Deye offers](https://comparepv.com/offers?manufacturer=deye&product_type=battery) [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 | BOS-G35 | ECS4300H-H7 | Difference | | --- | --- | --- | --- | | Usable energy | 32.25 kWh | 26.13 kWh | 6.12 kWh apart | | Max system capacity | 61.4 kWh | 29.0 kWh | +32.5 kWh for BOS-G35 | | Nominal energy | 35.84 kWh | 29.03 kWh | 6.81 kWh apart | | Nominal voltage | 358 V | 403 V | 45 V apart | | Weight | 420.0 kg | 263.5 kg | -156.5 kg for ECS4300H-H7 | | Weight per kWh | 13.0 kg/kWh | 10.1 kg/kWh | -2.9 kg/kWh for ECS4300H-H7 | | Ingress protection | IP20 | IP65 | IP20 vs IP65 | | Modules per stack | 3-12 | 2-7 | 3-12 vs 2-7 | | Operating voltage | 291.2-408.8 V | 340.2-459.9 V | 291.2-408.8 V vs 340.2-459.9 V | | Dimensions | 1629x530x602 mm | 1006x570x380 mm | 1629x530x602 mm vs 1006x570x380 mm | ## Every compared parameter | Parameter | BOS-G35 | ECS4300H-H7 | | --- | --- | --- | | Usable energy | 32.25 kWh | 26.13 kWh | | Nominal energy | 35.84 kWh | 29.03 kWh | | Depth of discharge | 90 % | 90 % | | Max system capacity | 61.4 kWh | 29.0 kWh | | Modules per stack | 3-12 | 2-7 | | 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 % | 90 % | | Capacity at end of life | 70 % | - | | Self-discharge | - | - | | Voltage class | High voltage | High voltage | | Nominal voltage | 358 V | 403 V | | Operating voltage | 291.2-408.8 V | 340.2-459.9 V | | Cell chemistry | LFP | LFP | | Active cell balancing | - | - | | Thermal management | - | - | | Inverter | None (battery only) | None (battery only) | | Inverter power | - | - | | Grid connection | - | - | | Backup power | - | - | | Weight | 420.0 kg | 263.5 kg | | Weight per kWh | 13.0 kg/kWh | 10.1 kg/kWh | | Dimensions | 1629x530x602 mm | 1006x570x380 mm | | Ingress protection | IP20 | IP65 | | Outdoor-rated | - | Yes | | Min operating temperature | -20 °C | -20 °C | | Max operating temperature | 55 °C | 55 °C | | Warranty | 10 yrs | - | | Warranted throughput | - | - | ## Related comparisons - [Deye BOS-G35 vs Deye BOS-G30](https://comparepv.com/compare-batteries/bos-g35/bos-g30) - 5 differences, the largest is usable energy - [Deye BOS-G35 vs Deye BOS-G40](https://comparepv.com/compare-batteries/bos-g35/bos-g40) - 5 differences, the largest is usable energy - [Deye BOS-G35 vs Deye BOS-G40 Pro](https://comparepv.com/compare-batteries/bos-g35/deye-bos-g40-pro) - 9 differences, the largest is usable energy - [FoxESS ECS4300H-H7 vs Deye BOS-G25](https://comparepv.com/compare-batteries/fox-ess-ecs4300h-h7/bos-g25) - 10 differences, the largest is usable energy - [FoxESS ECS4300H-H7 vs Deye BOS-G25 Pro](https://comparepv.com/compare-batteries/fox-ess-ecs4300h-h7/deye-bos-g25-pro) - 10 differences, the largest is usable energy - [FoxESS ECS4300H-H7 vs FoxESS ECS4300H-H6](https://comparepv.com/compare-batteries/fox-ess-ecs4300h-h7/fox-ess-ecs4300h-h6) - 6 differences, the largest is usable energy --- Source: https://comparepv.com/compare-batteries/bos-g35/fox-ess-ecs4300h-h7 Not in this file, on the page: a written summary generated on request.