Deye GB-L20

18.4 kWh usable LFP High voltage Outdoor-rated

Compare with closest alternative Datasheet PDF

Usable (kWh)

18.40

Strong · top 18%

Round-trip (%)

Not published

Power (kW)

20.5

Strong · top 5%

Cycles

6000

Typical · median 6000

Weight (kg)

214.0

Typical · median 189.8 kg

Warranty (yrs)

Typical · median 10 yrs

The GB-L series is a modular high-voltage system designed for battery tower construction and easy capacity expansion as energy consumption increases. Its main advantage is the LiFePO4 (LFP) chemistry - compared to NMC, it ensures higher thermal safety, more stable performance, and longer lifespan, which has real significance in daily residential and commercial installations.

In practice, users gain high cyclic durability and a long warranty, meaning predictable operational costs and less risk of capacity degradation over time. The system offers smart battery management - monitoring key parameters, cell balancing, and communication features that facilitate integration with automation systems.

GB-L is a scalable solution (from smaller setups to larger configurations) and is ready for cooperation with hybrid inverters as well as on-grid and off-grid systems. It’s an excellent choice for homes with PV systems, small businesses, and facilities requiring backup power supply.

Ranking

36 batteries from 12 to 20 kWh

Metric This battery Median Position in class Rank in class

Round-trip efficiency - 95.0% Not published -

Power per kWh 1.11 0.68 Strong · top 5% 1

Cycle life 6000 6000 Typical 5

Weight per kWh 11.6 12.4 Typical 12

Warranty 10 yrs 10 yrs Typical 3

Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

See 44 Deye offers

Specifications

Open datasheet PDF

Usable energy 18.4 kWh What the battery delivers, full to empty

Nominal energy 20.45 kWh What the cells hold

Depth of discharge 90 %

Module energy 4.09 kWh

Modules per stack 2 to 6

Max system capacity 24.5 kWh

Continuous discharge power 20.48 kW 1.11 kW per kWh

Continuous charge power 20.48 kW

Peak discharge power 25.60 kW For 120 s

Max discharge current 40 A

Max charge current 40 A

Peak discharge current 50 A

Cycle life 6000 cycles

Capacity at end of life 70 %

Voltage class High voltage

Nominal voltage 512.0 V

Operating voltage 166 to 700 V

Cell technology LFP LiFePO4 (LFP)

Cell management Cobalt-freeThermal management

Dimensions 1310 × 540 × 385 mm Height × width × depth

Weight 214.0 kg 11.6 kg per kWh

Enclosure IP65

Mounting floor

Outdoor installation Yes

Operating temperature -20 to 60 °C

Protocols CAN2.0RS485

Warranty 10 years

Certifications CEIEC62619VDE2510-50UL1973UL9540AUN38.3

Pros and cons

5 positive · 2 caution

What owners get

Modular high-voltage architecture

The system is built from 4.09 kWh LFP modules (GB-LM4.0, 102.4 V) connected in series without extra inter-module cabling, enabling flexible battery tower expansion as household or commercial power demand grows.

10-year warranty with strong cycle life

The manufacturer rates the system for at least 70% retained capacity after 6,000 cycles at 25°C, backed by a 10-year comprehensive warranty, in line with other Tier-1 HV LFP residential/commercial storage systems.

LiFePO4 chemistry for improved safety

Compared to NMC cells, LFP chemistry offers greater thermal stability and lower thermal-runaway risk, which matters for indoor installations in homes and small businesses.

Wide operating voltage range

The system operates across roughly 166-180 V up to 700-750 V (depending on configuration and variant), allowing module count to be matched to different Deye hybrid inverters for both on-grid and off-grid setups.

IP66 protection on newer variants

The GB-L Plus line features an IP66-rated enclosure, improving dust and moisture resistance and widening installation options, such as unconditioned utility rooms.

Trade-offs

Fragmented product lineup complicates selection

The series spans several sub-variants (GB-L, GB-L Plus, GB-L Lite, GB-L Pro, GB-SL) with differing warranty terms (5 to 10 years) and voltage ranges, raising the risk of mismatched components when installers expand an existing system.

Shorter warranty on the Lite variant

The GB-L Lite variant carries only a 5-year warranty despite sharing the same rated 6,000-cycle durability as other models backed by a 10-year warranty, putting this specific variant at a disadvantage within the series.

Alternatives

All Deye batteries

Battery Usable Round-trip Power Voltage Difference

Deye GB-L20 18.4 kWh - 20.5 kW High voltage You are here

GB-SL-EU (5 modules in series) 18.4 kWh - - HV Similar on paper

Ai-HB 200A 18.43 kWh 95.0% 12.3 kW HV -8.2 kW

BOS-G20 18.43 kWh - - HV Similar on paper

Tower Pro TP19 18.24 kWh 95.0% 19.2 kW HV -0.2 kWh, -1.3 kW

ECS2900-H7 18.14 kWh 95.0% - HV -0.3 kWh

ECS4300H-H5 18.67 kWh 95.0% - HV +0.3 kWh

Tower T17 17.76 kWh - 10.7 kW HV -0.6 kWh, -9.8 kW

HS20 19.06 kWh - - HV +0.7 kWh

About the GB-L series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this model's own.

What is the capacity of the Deye GB-L energy storage system and can it be expanded?

The GB-L system is built from modules with a capacity of approximately 4.09 kWh each, connected in series from 2 up to 6 units. This allows configurations ranging from 8.18 kWh to 24.56 kWh of total energy, with usable energy ranging from 7.36 kWh to 22.10 kWh. Thanks to its modular design, you can start with a smaller setup and add more modules later, increasing capacity as energy consumption grows at home or in a business.

How does the LiFePO4 chemistry in Deye GB-L differ from common NMC batteries?

LiFePO4 (LFP) chemistry used in GB-L is significantly more thermally stable than NMC, meaning a lower risk of overheating or fire even under intensive daily use. LFP cells also handle full charge-discharge cycles better, resulting in a longer battery lifespan. In practice, this means safer operation of the storage unit in a garage or boiler room and less capacity degradation after several years of use.

What warranty does the Deye GB-L energy storage system come with?

The GB-L series is covered by a standard 10-year manufacturer warranty, valid until whichever comes first - the warranty period or the energy throughput limit specified in the datasheet. Note that the GB-L Lite variant comes with a shorter 5-year warranty, while GB-L Plus retains the full 10 years, so it's worth checking the specific model's current datasheet with your supplier before purchasing.

Does the Deye GB-L battery work properly in low temperatures, e.g. in an unheated garage?

According to manufacturer data, discharging the GB-L is possible from -20°C to 60°C, while charging is permitted from 0°C to 55°C. This means the battery can safely operate and supply power in winter even in an unheated room, but it needs above-freezing temperatures for effective charging. The built-in BMS monitors cell temperature and automatically limits or blocks charging outside the safe range, protecting the battery from damage.

Which inverters is the Deye GB-L energy storage system compatible with?

GB-L is a high-voltage system designed to work with Deye hybrid inverters that support the appropriate battery input voltage range, in both on-grid and off-grid installations. Communication runs over CAN or RS485 bus, enabling full integration with the inverter's automation - parameter monitoring, cell balancing, and remote state-of-charge readout. Before purchasing, it's worth verifying compatibility between the specific inverter model and the system's voltage range.

Who is the Deye GB-L energy storage system designed for - homes or businesses?

Thanks to its scalability from about 8 kWh up to over 24 kWh in a single tower, GB-L works well both in single-family homes with PV installations and in small businesses with higher energy demands. The system is also well-suited for buildings requiring backup power during grid outages, thanks to its off-grid capability. The modular design lets you match capacity to current needs without replacing the entire system in the future.

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