---
title: "Deye BOS-G40 36.86 kWh Battery: Specs & Datasheet | ComparePV"
description: "Deye BOS-G40 36.86 kWh home battery. Specs: 6000 cycles, 420.0 kg, 10 yrs warranty."
source: "https://comparepv.com/battery/bos-g40"
updated: 2026-01-10
---

# Deye BOS-G40


## Identity

- **Manufacturer:** Deye
- **Model:** BOS-G40
- **Series:** BOS-G
- **Usable energy:** 36.86 kWh
- **Voltage class:** High voltage
- **Cell technology:** LFP


## How it compares

Compared against 29 batteries from 20 to 50 kWh. Ranks are within that class.


| Measure | This battery | Class median | Standing | Rank in class |
| --- | --- | --- | --- | --- |
| Round-trip efficiency | - | 95.0% |  |  |
| Power per kWh | - | 0.51 |  |  |
| Cycle life | 6000 | 6000 | Typical | 2 |
| Weight per kWh | 11.4 | 11.1 | Typical | 16 |
| Warranty | 10 yrs | 10 yrs | Typical | 2 |


## Specification


### Capacity

- **Usable energy:** 36.86 kWh
- **Nominal energy:** 40.96 kWh
- **Depth of discharge:** 90 %
- **Module energy:** 5.12 kWh
- **Modules per stack:** 3 to 12
- **Max system capacity:** 61.4 kWh


### Power

- **Max discharge current:** 100 A
- **Max charge current:** 100 A
- **Peak discharge current:** 125 A


### Efficiency and lifetime

- **Cycle life:** 6000 cycles
- **Capacity at end of life:** 70 %


### Cells and voltage

- **Voltage class:** High voltage
- **Nominal voltage:** 409.6 V
- **Operating voltage:** 333 to 467 V
- **Cell technology:** LFP
- **Cell management:** Cobalt-free


### Physical

- **Dimensions:** 1629 × 530 × 602 mm
- **Weight:** 420.0 kg
- **Enclosure:** IP20
- **Mounting:** rack
- **Operating temperature:** -20 to 55 °C


### Compatibility

- **Compatible inverters:** Deye (remote upgrade compatible)
- **Protocols:** CAN2.0, RS485


### Warranty and certificates

- **Warranty:** 10 years
- **Certifications:** CE, IEC62619, VDE2510-50, UL1973, UL9540A, UN38.3


## About this series

The BOS-G series are high-voltage rack-format energy storage units designed for rapid installation and seamless expansion without necessitating a complete system overhaul. Their most distinguishing feature is **modular scalability** - capacity increases by adding further modules, and the system performs effectively both as a UPS backup and for PV self-consumption in businesses or larger homes.

BOS-G utilizes the **LiFePO4 (LFP)** chemistry, which, compared to NMC, is typically more thermally stable, better withstands intensive operation, and promotes a long service life. This translates to a **high cycle count** and **long warranty period** - meaning predictable costs and reduced risk of performance decline after several seasons for the user.

In practice, an **intelligent Battery Management System (BMS)** with cell balancing and a comprehensive safety suite, along with communication (e.g., CAN/RS485), facilitating integration with inverters and hybrid systems, is also crucial. BOS-G is a suitable choice for grid-connected, hybrid, and specific off-grid scenarios where safety, serviceability, and flexible expansion are key.


## Datasheet

[Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/batteries/bos-g-8d1eb7da2fb0.pdf)


## Alternatives


| Battery | Usable energy | Round-trip | Power | Voltage | Difference |
| --- | --- | --- | --- | --- | --- |
| [Deye BOS-G40 Pro](https://comparepv.com/battery/deye-bos-g40-pro) | 36.86 kWh |  | 41.0 kW | HV | Similar on paper |
| [Deye BOS-G35](https://comparepv.com/battery/bos-g35) | 32.25 kWh |  |  | HV | -4.6 kWh |
| [Deye BOS-G45](https://comparepv.com/battery/bos-g45) | 41.47 kWh |  |  | HV | +4.6 kWh |
| [Sigenergy SigenStor BAT 8.0 system (5 modules)](https://comparepv.com/battery/sigenergy-sigenstor-bat-8-0-system-5-modules) | 39 kWh |  | 20.0 kW |  | +2.1 kWh |
| [Sigenergy SigenStor BAT stack (5 modules)](https://comparepv.com/battery/sigenergy-sigenstor-bat-stack-5-modules) | 40.3 kWh |  | 20.0 kW |  | +3.4 kWh |
| [Sigenergy SigenStor BAT stack (4 modules)](https://comparepv.com/battery/sigenergy-sigenstor-bat-stack-4-modules) | 32.24 kWh |  | 16.0 kW |  | -4.6 kWh |
| [Sigenergy SigenStor BAT 8.0 system (4 modules)](https://comparepv.com/battery/sigenergy-sigenstor-bat-8-0-system-4-modules) | 31.2 kWh |  | 16.0 kW |  | -5.7 kWh |


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Source: https://comparepv.com/battery/bos-g40