Innovative BCU Power Solution for Energy Storage System


As the shift to new energy continues and the need for improving the utilization efficiency of energy grows, the proportion of solar photovoltaic power generation systems in the power grid is gradually increasing. How to ensure the reliability and safety of the power supply draws a big challenge for the Power Grid. Energy storage systems not only ensure the stability and reliability of the solar PV system, but also brings an effective way to solve dynamic power quality problems such as voltage pulses, inrush currents, voltage dips, and momentary power interruptions.

In energy storage systems, batteries are generally installed in the battery container according to the international standards, which consists of batteries, battery series control unit(BCU), HVAC, fire suppression system, etc.

MORNSUN is always providing you with the diverse up-to-date power solutions for the energy storage industry. Check out below the BCU Power Solution for the battery container and see how we can guarantee we'll provide the ideal fit for your system. 

Power Requirements for BCU of The Battery Container


Figure 1: Block diagram of energy storage system

1. DC/DC Solution Requirements

●  Ultra-wide input voltage range of 500-1500VDC that depends on the voltage of Battery Racks

●  High isolation voltage, reinforced insulation and high level of safety

●  Input reverse protection

●  Meets complicated environmental requirements


2. AC/DC Solution Requirements

●  High requirements for surge voltage input

●  PFC function

●  Avoid harmonic interference

●  Excellent EMC performance

MORNSUN Innovative Power Solution


Figure 2: Block diagram of BCU for battery container

The block diagram circuit above shows a more detailed look at the BCU power solution for a battery container. As the core of the battery management, BCU power design includes many components from Mornsun’s power solution line. With our wide selection in the 200W 300-1500VDC ultra-wide input voltage DC/DC converter PV200-29Bxx series and AC/DC enclosed switching power supply LMF150-20Bxx series, the design features redundant power supplies that provide excellent reliability for the entire energy system.


The BCU collects battery voltage, current signals and fuse status signals for system monitoring. It keeps communication with the battery Racks and the power conversion system through the CAN bus. When the battery fails, the contactor can be quickly controlled to cut off the battery line to ensure the safety of the whole system.

The design requires a 500 to 1500VDC input voltage isolation DC/DC converter and Mornsun’s 200W PV200-29Bxx series is ideal for this application. This line of isolation converters features ultra-wide 300-1500VDC input voltage range, input reverse polarity protection. With a 285VDC under-voltage protection threshold, it keeps the power supply safe during battery discharge. In addition, with double insulation and high isolation voltage of 4000VAC and a safe distance that meets CSA-C22.2 No.107.1 and EN62109 certification, this converter ensures the insulation level of the whole system.


The Mornsun’s LMF150-20Bxx series is an excellent choice for the BCU power supply with its input voltage range of 85-264VAC, the capability to withstand 300VAC surge input for 5s, which meets the requirements of the power grid system and greatly improves the reliability of the power supply. Besides, it’s built-in active PFC function not only provides a power factor of 0.99, but also meets the harmonic current requirements of IEC / EN61000-3-2 Class A. Specifically, it’s EMI meets CISPR32/EN55032 CLASS B that brings very high electromagnetic compatibility to the entire energy storage system.

Product Features

1.  200W 300-1500VDC Ultra-wide Input DC/DC Converter PV200-29Bxx Series


* Offer flexible solutions tailored to the customer and specific project requirements 

●   Ultra-wide 300-1500VDC input voltage range

   High isolation voltage 4000VAC

   Industrial grade operating temperature -40℃ to +70℃

   Multiple protections: input reverse polarity and under-voltage protection, output short circuit, over-current and over-voltage protection

   CSA-C22.2 No.107.1, EN62109 safety approved

   Operating up to 5000m altitude

2.  150W Active PFC Enclosed AC/DC LMF150-20Bxx Series


    Universal 85-264V AC or 120-373VDC input

    Accepts AC or DC input (dual-use of same terminal)

    Withstand 300VAC surge input for 5s

    High isolation voltage up to 4000VAC

    Operating temperature range: -30℃ to +70℃

    Built-in active PFC function(0.99 power factor)

    Low ripple & noise

    Output short circuit, over-current, over-voltage, over-temperature protection(Built-in constant current limiting circuit)

    Remote ON-OFF control

    Over-voltage class Ⅲ(designed to meet EN61558)

    Meets IEC/EN62368, UL62368(pending), EN60335(pending) standards

    EMI meets CISPR32/EN55032 CLASS B

For more information, feel free to contact us.

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