48V 2.4kW Bidirectional AC/DC Low Power Supply with MPPT Module BIM48-2400C

Abstract

The BIM48-2400C is a 48V bidirectional AC/DC power module from ImaxPWR that integrates a 2400W pure sine wave inverter, a 50A battery charger, an 800W built-in MPPT solar charger, and a UPS bypass with typical 20ms switching into a single 57×161×258mm chassis. Operating from a wide 90~264Vac input and 40~59.5Vdc battery bus, the module supports grid-tied charging, off-grid inverter, and PV-direct charging under a single unit, making it suitable for telecom backup, residential off-grid solar, and mobile energy storage systems.

1. Product Positioning and Model Naming

The BIM series 2400W bidirectional power module uses an efficient soft-switching patented topology with full digital control, packing “charger + inverter + MPPT + UPS bypass” into a standard plug-in chassis. The AC side covers 90~264Vac wide-range input, the DC side covers 40~59.5Vdc wide battery voltage, and three power flow directions (rectifier charge, off-grid inverter, PV MPPT) are managed by an onboard DSP and an external EMS via RS485 or CAN.

2. Key Functions and Operating Modes

Based on the user manual V3.0, the module supports four operating states selected by host commands and the presence of grid/PV:

• Standby mode — communicates with the host, waiting for commands;
• Auto mode — bypass priority when grid is present, off-grid inverter priority when grid fails; the module auto-switches between rectifier and inverter;
• DC/MPPT charging — solar panels connect directly to the DC bus, up to 800W, MPPT tracking efficiency 99.9% (referenced to EN50530); when MPPT and PCS charge together, MPPT power is used first and mains makes up the balance;
• Battery wake-up — if the battery is under-voltage locked, the module detects AC or DC/MPPT input within 5s and ramps up at 40V/3A to wake the BMS.

The specifications below are based on the BIM48-2400C user manual V3.0, Section 5 “Technical Parameters”, and referenced against IEC international standards for grid-tied and EMC requirements, with PV MPPT performance aligned to CENELEC EN50530.

3. Technical Specifications

3.1 Inverter Output (Off-grid Mode)

3.2 Rectifier Charging (Grid-tied Mode)

3.3 Built-in DC/MPPT Solar Charger

3.4 Mechanical, Environmental, and Reliability

4. Appearance and Electrical Terminals

The front panel integrates AC input (L_IN/N_IN), UPS bypass output (L_INV/N_INV), battery DC output (DC+/DC-), MPPT PV input (PV+/PV-), and signal terminals (CANH/CANL, RS485_A/B, 5V, GND, BATT_ON, GND_AUX). The battery port uses an XT90 connector, the PV port uses an XT60 connector, and the AC side uses 6.2mm-pitch locking terminals. Wiring details are documented in the user manual “Module Interface Definition” chapter.

5. Cooling and Reliability Design

The module uses dual ball-bearing fans with NTC closed-loop speed control. At light load and room temperature the fans stop or run at low speed, achieving 45dB ultra-quiet operation. According to IEC 61000 standards, the unit provides input over/under-voltage, output over-voltage, overtemperature, short-circuit, fan-failure, and NTC-failure protection; faults shut down the unit and report to the host, and a clear-fault command is required before restart. EMC is designed to EN55032/EN55035.

6. Typical Applications

• Telecom base station backup — 48V DC bus, parallel modules, seamless off-grid inverter switch on grid loss for UPS-grade backup. The 90~264Vac wide input covers unstable mains in rural and island sites, and the 50A charge current refills batteries quickly during short grid windows.
• Residential / villa off-grid solar — built-in 800W MPPT pairs with 14S NMC or 16S LFP batteries for a compact solar-storage unit. The pure sine wave output powers TVs, lights, and small appliances without hum or interference; 20ms UPS bypass keeps broadband routers and security systems online during grid flicker.
• Mobile energy storage / emergency power — 200% peak for 200ms to handle inrush currents from power tools, pumps, and medical devices. The 2.3kg chassis fits into rack-mounted mobile generator trailers or battery cabinets.
• Battery formation / DC load testing — 50A bidirectional DC, host-programmable, with 0.1A resolution current limit and 0.1Vdc step charge voltage. Supports regenerative discharge to feed energy back to the grid rather than burning it off in resistors.
• Vehicle / marine auxiliary power — DC/MPPT supports 12/24V vehicle cigarette-lighter input current-limited to 10A, and the wide 40~59.5Vdc battery bus works with second-life LFP packs and sodium-ion batteries.

In weak-grid or off-grid sites across Southeast Asia, Africa, and Latin America, the BIM48-2400C is typically deployed three to six modules per cabinet to form a 7~14kW solar-storage power node, with the EMS managing PV yield, battery state of charge, and load priority. For higher-power systems beyond 15kW, refer to the ImaxPWR product center for PCS and all-in-one solar storage cabinets.

7. Frequently Asked Questions (FAQ)

Q1: Can the BIM48-2400C connect a 48V solar panel directly, or do I need an external MPPT?

The module has a built-in DC/MPPT port (PV+/PV-, XT60 connector), rated 12~59Vdc, 12.5A, 800W, with MPPT tracking efficiency of 99.9% (referenced to EN50530). No external MPPT is required; solar panels connect directly. Below 40V the power derates; below 30V the input current is automatically limited to 10A to support 12/24V vehicle inputs.

Q2: What does a 20ms UPS bypass mean? Will IT equipment drop out?

20ms is roughly one mains cycle at 50Hz. Standard power supplies, LED lighting, and PCs ride through 20ms on their internal bulk capacitance. For servers or precision instruments sensitive to any interruption, add a UPS or feed critical loads directly from the battery bus. Bypass current is rated at max 14A; above that, the host calculates the remaining charge current based on cable ampacity.

Q3: What battery does it work with? 14S NMC vs 16S LFP?

The DC operating range is 40~59.5Vdc. A fully charged 14S NMC pack is about 58.8V and a 16S LFP pack is about 58.4V, both inside the operating window. Charge voltage and current are managed by the host BMS over CAN or RS485; the module ramps current based on BMS voltage, temperature, and SOC reports.

Q4: Can it start motors or air conditioners off-grid?

The output is pure sine wave with THDV <3% (linear load). Peak capability is 110% for 20s, 125% for 5s, 150% for 2s, and 200% for 200ms. Typical air conditioner or refrigerator inrush is 3~5× rated for 100~500ms, so a single 2400W module usually starts 1~1.5 HP air conditioners. For larger motors, parallel multiple modules or choose a larger PCS.

Q5: Does it support parallel operation? How is communication handled?

Each module is rated 2400W and communicates with the EMS via RS485 (standard) or CAN (optional), which coordinates charge/discharge power across a parallel string. The host can set on/off, working mode, charge voltage/current, inverter frequency and voltage, and read back DC voltage/current, PCS status, mains input, ambient temperature, and alarms.

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About the Author

About ImaxPWR

ImaxPWR Power Co., Ltd. (Brand: ImaxPWR) is a National High-Tech Enterprise and source manufacturer covering bidirectional converters, DC/DC, energy management, and energy storage cabinet integration, with CE, UL, and ROHS certified products used in telecom backup, residential storage, solar charging, and V2G applications.

© 2026 ImaxPWR Power Co., Ltd. · This is a product introduction. Technical data sourced from the BIM48-2400C user manual V3.0 and international standards.