The **B300-R** is the ruggedized, rack-mountable expansion battery module designed primarily for the **Bluetti AC300** and **AC500** power stations. It is built to provide high-capacity energy storage using advanced Lithium Iron Phosphate (LiFePO4) technology. Below is a breakdown of its primary electronic components and technical specifications. --- ### 1. Core Electronic Components | Component | Description | | :--- | :--- | | **Battery Cells** | Utilizes **LiFePO4 (Lithium Iron Phosphate)** cells, known for safety, thermal stability, and a long lifecycle (3,500+ cycles). | | **BMS (Battery Management System)** | The "brain" of the unit. It monitors voltage, current, and temperature, protecting against over-charging, short circuits, and overheating. | | **MPPT Controller** | Integrated Maximum Power Point Tracking allows the battery to be charged directly via solar panels (up to 200W) without the main head unit. | | **DC-DC Converter** | Manages voltage regulation for the output ports (USB and Car socket) to ensure stable 12V and 5V power delivery. | | **Communication Bus** | Proprietary data link ports that allow the battery to communicate its State of Charge (SoC) and health status to the AC300/AC500 master unit. | --- ### 2. Technical Specifications | Feature | Specification | | :--- | :--- | | **Capacity** | 3,072Wh (51.2V, 60Ah) | | **Cell Chemistry** | LiFePO4 | | **Cycle Life** | 3,500+ Cycles to 80% Original Capacity | | **Solar Input** | 200W Max (Voc 12-60V, 10A) | | **Car Input** | 12/24V from Cigarette Lighter Port | | **Max Input (AC)** | 500W (Via optional T500 Adapter) | --- ### 3. Integrated Output Interfaces Even when disconnected from a main power station, the B300-R electronics allow it to function as a standalone DC power bank through the following ports: * **USB-C Port:** 1 x 100W Max (Power Delivery 3.0). * **USB-A Port:** 1 x 18W (Quick Charge 3.0). * **DC Outlet:** 1 x 12V/10A (Car Cigarette Lighter Port). --- ### 4. Key Differences: B300 vs. B300-R The "R" in B300-R stands for **Rack-mount**. While the internal cell chemistry remains identical to the standard B300, the electronics and housing are modified for: * **Form Factor:** Designed to fit standard 19-inch server racks. * **Cooling Electronics:** Optimized airflow pathways for stacked environments. * **Wiring:** Connectors are repositioned for easier access when mounted in a cabinet.