Biwatt sodium-ion home storage system enters the residential market with a 58 V modular platform built for flexible home energy storage. Moreover, the new Nest R5 Series uses sodium iron pyrophosphate chemistry. It comes in two versions for different installation needs. As a result, homeowners and installers can choose either an all-in-one setup or a battery-only configuration.
Biwatt sodium-ion home storage system overview
Biwatt designed the Nest R5 Series for residential applications. First, the PowerNest R5i combines battery modules with a single-phase hybrid inverter. In contrast, the PowerNest R5 works as a standalone battery system for use with third-party hybrid inverter ecosystems. Therefore, the product line supports both integrated and flexible home storage designs.
Both versions use a wire-free and stackable structure. This design removes inter-module cabling. Consequently, installers can work faster and reduce wiring complexity. In addition, the architecture helps lower the chance of field errors during setup and commissioning.
Biwatt sodium-ion home storage system battery specs
Each floor-standing module offers 4.5 kWh of storage capacity. The module uses 170 Ah NFPP sodium-ion cells. In addition, each module delivers 3 kW of continuous power output and supports a maximum current of 55 A. The system operates at 58 V, which supports a low-voltage residential design.
Biwatt says the battery can reach up to 8,000 cycles at 25 C. The test conditions use 0.5C charge and 0.5C discharge rates with 80% depth of discharge. Furthermore, the platform supports a recommended depth of discharge of 90%. This combination helps users access strong usable energy over long operating periods.
Biwatt sodium-ion home storage system scalability
The platform scales in several ways. A single stack can hold up to four modules. Since each module stores 4.5 kWh, one stack can reach 18 kWh. In addition, users can connect up to four stacks in parallel. Therefore, the total installed capacity can reach 72 kWh across a larger residential setup.
The maximum stack current reaches 220 A. This scalable format gives installers more flexibility. It also helps homeowners size a system around changing backup or self-consumption needs.
Biwatt sodium-ion home storage system design and installation
Biwatt focuses heavily on easy installation. The wire-free module format simplifies physical assembly. As a result, installers do not need to manage interconnecting cables between modules. This approach can shorten commissioning time. It can also improve overall installation neatness.
Each unit weighs 65 kg and measures 670 mm × 420 mm × 250 mm. The floor-standing form factor suits residential energy rooms and utility spaces. Moreover, the system carries an IP65 rating. That means it offers strong protection against dust and water ingress in suitable installation environments.
Biwatt sodium-ion home storage system temperature range
The system supports operation across a wide temperature window. For discharge, it works from −30 C to 55 C. For charging, it works from −20 C to 55 C. Therefore, the system covers a broad range of residential climate conditions.
Biwatt sodium-ion home storage system power management
Each module includes a dedicated DC-DC optimizer and a custom battery management system. Together, these components enable active balancing at the module level. As a result, the system can support better voltage stability during operation.
Biwatt also says this architecture increases usable energy and helps maintain more consistent power delivery across different states of charge. In practical terms, that means the storage platform aims to deliver stable performance throughout daily cycling.
Biwatt sodium-ion home storage system safety and compliance
Safety remains a central part of the product positioning. The Nest R5 Series uses NFPP chemistry, which supports strong thermal stability. In addition, the 58 V low-voltage design adds another layer of residential suitability.
Biwatt says it is pursuing UL1973 certification and UL9540A fire safety testing. At the same time, the system already holds CE and RCM compliance. Therefore, the company is aligning the platform with key residential storage safety and market requirements.
Biwatt sodium-ion home storage system monitoring features
The platform includes two service and monitoring pathways. When users pair the system with Biwatt inverters, they gain remote monitoring, system diagnostics, and over-the-air firmware updates. Consequently, owners and service teams can manage system performance more easily.
For local field service, the unit includes RS485, CAN, and USB-C communication interfaces. In particular, the built-in USB-C port gives technicians direct access to diagnostic data. This feature can simplify on-site troubleshooting and maintenance.
Biwatt sodium-ion home storage system summary
The Biwatt sodium-ion home storage system combines modular design, residential flexibility, and detailed control features in a 58 V platform. It offers 4.5 kWh per module, 3 kW continuous output, and expansion up to 72 kWh. In addition, it supports up to 8,000 cycles, IP65 protection, active module balancing, and broad inverter compatibility. For homeowners and installers, the Nest R5 Series presents a clear residential storage option built around scalable sodium-ion technology.
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