---
title: "Deye BOS-G40 Pro vs Sigenergy SigenStor BAT 8.0 system (5 modules) - Battery Comparison | ComparePV"
description: "Compare Deye BOS-G40 Pro vs Sigenergy SigenStor BAT 8.0 system (5 modules) side by side: usable energy, round-trip efficiency, power, cycle life and the full specification."
source: "https://comparepv.com/compare-batteries/deye-bos-g40-pro/sigenergy-sigenstor-bat-8-0-system-5-modules"
updated: 2026-01-25
---

# Deye BOS-G40 Pro vs Sigenergy SigenStor BAT 8.0 system (5 modules)

BOS-G40 Pro leads on the differences that matter

The largest is usable energy: 2.14 kWh apart. 3 of 16 comparable parameters are identical, with 17 more left out because at least one datasheet does not publish them.


## The two batteries


| Attribute | A | B |
| --- | --- | --- |
| Battery | [Deye BOS-G40 Pro](https://comparepv.com/battery/deye-bos-g40-pro) | [Sigenergy SigenStor BAT 8.0 system (5 modules)](https://comparepv.com/battery/sigenergy-sigenstor-bat-8-0-system-5-modules) |
| Manufacturer | Deye | Sigenergy |
| Usable energy | 36.86 kWh | 39 kWh |
| Cells and voltage | LFP HV | LFP |

[See 44 Deye offers](https://comparepv.com/offers?manufacturer=deye&product_type=battery)

[See 15 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 | BOS-G40 Pro | SigenStor BAT 8.0 system (5 modules) | Difference |
| --- | --- | --- | --- |
| Usable energy | 36.86 kWh | 39.00 kWh | 2.14 kWh apart |
| Continuous discharge power | 40.96 kW | 20.00 kW | +20.96 kW for BOS-G40 Pro |
| Max system capacity | 81.9 kWh | 48.4 kWh | +33.6 kWh for BOS-G40 Pro |
| Nominal energy | 40.96 kWh | 40.30 kWh | 0.66 kWh apart |
| Continuous charge power | 40.96 kW | 20.00 kW | +20.96 kW for BOS-G40 Pro |
| Peak discharge power | 51.20 kW | 30.00 kW | +21.20 kW for BOS-G40 Pro |
| Power per kWh | 1.11 kW/kWh | 0.51 kW/kWh | +0.60 kW/kWh for BOS-G40 Pro |
| Weight | 428.0 kg | 383.0 kg | -45.0 kg for SigenStor BAT 8.0 system (5 modules) |
| Weight per kWh | 11.6 kg/kWh | 9.8 kg/kWh | -1.8 kg/kWh for SigenStor BAT 8.0 system (5 modules) |
| Inverter | None (battery only) | Built in (all-in-one) | None (battery only) vs Built in (all-in-one) |
| Ingress protection | IP20 (battery enclosure) | IP66 | IP20 (battery enclosure) vs IP66 |
| Modules per stack | 5-16 | 1-6 | 5-16 vs 1-6 |
| Dimensions | 1629x530x602 mm | 1720x850x260 mm | 1629x530x602 mm vs 1720x850x260 mm |


## Every compared parameter


| Parameter | BOS-G40 Pro | SigenStor BAT 8.0 system (5 modules) |
| --- | --- | --- |
| Usable energy | 36.86 kWh | 39.00 kWh |
| Nominal energy | 40.96 kWh | 40.30 kWh |
| Depth of discharge | 90 % | - |
| Max system capacity | 81.9 kWh | 48.4 kWh |
| Modules per stack | 5-16 | 1-6 |
| Continuous discharge power | 40.96 kW | 20.00 kW |
| Continuous charge power | 40.96 kW | 20.00 kW |
| Peak discharge power | 51.20 kW | 30.00 kW |
| Power per kWh | 1.11 kW/kWh | 0.51 kW/kWh |
| Round-trip efficiency | - | - |
| Cycle life | 6000 cycles | - |
| Cycle test depth | 90 % | - |
| Capacity at end of life | 70 % | - |
| Self-discharge | - | - |
| Voltage class | High voltage | - |
| Nominal voltage | 410 V | - |
| Operating voltage | 352-467.2 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 | 428.0 kg | 383.0 kg |
| Weight per kWh | 11.6 kg/kWh | 9.8 kg/kWh |
| Dimensions | 1629x530x602 mm | 1720x850x260 mm |
| Ingress protection | IP20 (battery enclosure) | IP66 |
| Outdoor-rated | - | - |
| Min operating temperature | -20 °C | -20 °C |
| Max operating temperature | 55 °C | 55 °C |
| Warranty | 10 yrs | - |
| Warranted throughput | - | - |


## Related comparisons

- [Deye BOS-G40 Pro vs Deye BOS-G40](https://comparepv.com/compare-batteries/deye-bos-g40-pro/bos-g40) - 5 differences, the largest is max system capacity
- [Deye BOS-G40 Pro vs Deye BOS-G35](https://comparepv.com/compare-batteries/deye-bos-g40-pro/bos-g35) - 9 differences, the largest is usable energy
- [Deye BOS-G40 Pro vs Deye BOS-G45](https://comparepv.com/compare-batteries/deye-bos-g40-pro/bos-g45) - 9 differences, the largest is usable energy
- [Sigenergy SigenStor BAT 8.0 system (5 modules) vs Sigenergy SigenStor BAT stack (5 modules)](https://comparepv.com/compare-batteries/sigenergy-sigenstor-bat-8-0-system-5-modules/sigenergy-sigenstor-bat-stack-5-modules) - 3 differences, the largest is usable energy
- [Sigenergy SigenStor BAT 8.0 system (5 modules) vs Sigenergy SigenStor BAT stack (4 modules)](https://comparepv.com/compare-batteries/sigenergy-sigenstor-bat-8-0-system-5-modules/sigenergy-sigenstor-bat-stack-4-modules) - 8 differences, the largest is usable energy
- [Sigenergy SigenStor BAT 8.0 system (5 modules) vs Sigenergy SigenStor BAT 8.0 system (4 modules)](https://comparepv.com/compare-batteries/sigenergy-sigenstor-bat-8-0-system-5-modules/sigenergy-sigenstor-bat-8-0-system-4-modules) - 7 differences, the largest is usable energy


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Source: https://comparepv.com/compare-batteries/deye-bos-g40-pro/sigenergy-sigenstor-bat-8-0-system-5-modules

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