MARSTEK MST-BIE2.5-2500,MST-BIE5-2500 Solar Inverters Energy User Manual
MARSTEK MST-BIE2.5-2500,MST-BIE5-2500 Solar Inverters Energy

Product Overview

Introduction
MARSTEK Venus Series is an AC-coupled energy storage system, offering three working modes: AI Optimization, Self-Consumption, and Manual. It can be charged by grid and supply reliable power to both the grid and household loads.

Model

MARSTEK Venus Series includes two models: Venus-C (2.5 kWh) and Venus-E (5 kWh). The following table lists the MARSTEK Venus Series models to which this document applies.

Product Name Product Model
MARSTEK Venus-C MST-BIE2.5-2500
MARSTEK Venus-E MST-BIE5-2500

Symbol

1 Company name MST: Marstek Energy Co., Limited.
2 Series name BIE: MARSTEK VENUS
3 Power identification XX: 2.5 means 2.5kWH, 5 means 5kWH
4 Communication sign XX: 2500 means 2500W (Maximum output power)

Product Dimensions

Product Name Dimensions (mm)
MARSTEK Venus-C 450*200*550
MARSTEK Venus-E 520*254*640(Excluding handle)

Dimensions
Dimensions

Interface Introduction 

The interface layout and definition for the MARSTEK Venus Series are the same for both the Venus-C and Venus-E models.
Product Overview

A BACKUP: AC socket (EU standard) for powering loads during outages.
B GND: External ground point.
C On/off Button: Press to On/Long Press to Off.
D RS485: 485 protocol communication port.
E Grid: Connecting the system to the household grid.
F Wifi: External wireless device.
G PSV: Pressure relief valve to regulate internal pressure, with waterproof function.

LED Indicators

The indicator is located on the front of the product and is used to display the operating status of  Venus.
Product Overview

  1. Error.
  2. Grid port on.
  3. Backup port on.
  4. Capacity Indicator. Flashing from left to righ in charging, right to left in discharging.
  5. CT(Current Transformer) connected.
  6. WiFi connected.
  7. BT(Bluetooth) connected.
Indicator Status Description
Battery Off Power off
Steady on Power on
lights turn on from left to right Charging in progress
lights turn on from right to left Discharging in progress
Warn Off The device is operating normally
Red light on Device fault
Others Off Function: Not Started
Steady on Function: Started

Working Mode 

  • Self-Consumption: Requires a CT (Current Transformer). When the CT detects an active load, the device immediately supplies power to maximize electricity usage efficiency.
  • AI Optimization: Utilizes AI algorithms to develop a cost-effective charging strategy based on the user’s electricity consumption, solar power generation, and electricity pricing. This mode also includes self-consumption functionality.
  • Manual: Executes the user-defined charge/discharge strategy.
    These three modes can be configured through the app. Please refer to Chapter 3 for detailed operation steps.

System Layout

Plug-in Solution
The MARSTEK Venus Series products are compatible with all photovoltaic systems, enabling functions such as self-consumption and AI-based optimization. Below are household application scenarios integrated with solar systems.
System Layout

Whole-house Backup Solution 
The MARSTEK Venus Series products can also work in coordination with the MARSTEK Smartbox to provide whole-home backup power.
System Layout

Installation Instructions

Pre-installation Checklist

  • Before unpacking the device, inspect the packaging for visible damage—such as holes, cracks, or other signs of potential internal issues—and verify the device’s model number. If the packaging shows any damage or if the energy storage model does not match, do not proceed with unpacking. Instead, contact your dealer immediately.
  • After unpacking the device, inspect it for any visible external damage, such as dents, scratches, or other surface defects. Also, verify that all items shown on the packing list are present. If you notice any damage or missing components, please contact your dealer or email us at xxx@marstek.com for assistance.

Selecting the Installation Site

Floor Installation & Angle Requirements

  • Daily Use Stance: The energy storage device must be installed upright and must not be tilted forward, backward, sideways, or placed horizontally or upside down.

Site Notes

  • Preferred surfaces: Solid brick-concrete structures, concrete walls, or floors.
  • Alternative surfaces: If other materials (e.g., drywall, wood) are used, they must:
    • Flame Icon Be flame-retardant.
    • Weight Icon  Meet the load-bearing requirements of the equipment.

Clearance & Safety Requirements

  • Maintain sufficient clearance around the all-in-one machine to ensure proper heat dissipation and safety isolation.
  • There needs to be at least 150mm of space between the top and rear of the machine to ensure that there are no other devices around and no obstructions to meet the requirements of heat dissipation and safety isolation.
    System Layout
  • Prohibited nearby items:
    • Other equipment (except Venus-compatible devices and approved awnings).
    • Flammable or explosive materials.

Installing Accessories and Required Tools

Required Accessories

  • Before installation, ensure you have the following accessories ready (as listed in the packing list):

AC Cable×1
AC Cable
Omni Wheel×4
Omni Wheel
Handle×2
Handle

Note: Verify all items with the packing list. If any accessory is missing or damaged, contact your immediately.

Installing Tools

  • We are suggesting you to prepare the installation tools but not limited to the recommended tools listed as below:

Screwdrivers
Screwdrivers
Wrench
Wrench
Diagonal pliers
Diagonal Pliers
Insulating gloves
 Insulating Gloves
Measuring tape
Measuring Tape

Installation Steps

Step 1

  • Needed: the Venus device.
  • Actions: Lay down or reverse the Venus device, so you can see the drill holes on the bottom surface for the wheels.

Installation Steps
Installation Steps

Step 2

  • Needed: Wheels, screws, a screwdriver.
  • Actions: Install the wheels with a screwdriver, using provided screws.

Installation Steps

Step 3

  • Needed: the Venus device.
  • Actions: Pull up the Venus device, ensure the wheels can normally function.

Installation Steps
Installation Steps

Step 4

  • Needed: the Venus device, handles, a screwdriver.
  • Actions: Install the handle with a screwdriver, using the provided screws.

Installation Steps

Step 5

  • Needed: the Venus device, AC cable, home-load.
  • Actions: For the Grid socket, use the cylinder-shape-end of the provided AC cable to connect the Venus, and the plug-end to connect the house socket of city network. For the Backup socket, use your home-load wire and plug into the Backup socket.

!! Be careful, DO NOT connect both Venus’s Grid and Backup socket to the city network, which will cause Circuit Break.
Installation Steps

MARSTEK App for Smart Control

QR Code Installation 

Scan the QR code to download the app.
QR Code
APP Download

Registering and Connecting

First Step: Switch Server

  1. Select your current location from the list.
  2. Click OK to proceed, and you will be redirected to the Login Page.
    Registering And Connecting

Second Step: Login Page/Register Page/Forgot Password Page

  • Login Page
    1. If you haven’t registered before, click Register to go to the Register Page.
    2. If you forgot your password, click Forgot Password to go to the Forgot Password Page.
    3. Enter your email and password.
    4. Click Login to proceed.
    5. If your email and password are correct, you will be redirected to the Main Page.
      Registering And Connecting
      Login Page
  • Register Page
    1. Enter your email in the first field.
    2. Click Get Verification Code and check your inbox (including spam) for the code.
    3. Enter the verification code in the second field.
    4. Set your password in the third field and confirm it in the fourth field.
      Note: The password length must be between 8 and 30 characters.
    5. Read and agree to the User Privacy Agreement by checking the box.
    6. Click Register.
    7. Upon successful registration, you will be redirected to the Login Page.
      Registering And Connecting
      Register Page 
  • Forgot Password Page
    1. Enter your email in the first field.
    2. Click Get Verification Code and check your inbox (including spam) for the code.
    3. Enter the verification code in the second field.
    4. Set a new password in the third field.
    5. Click Reset Password.
    6. A success message will appear, and you will be redirected to the Login Page.
      Registering And Connecting
      Forgot Password Page 

Third Step: Add Device

  1. Click Add Device in the top left corner to go to the Add Device Page.
    Registering And Connecting
  2. Click Add via Bluetooth to proceed to the Add via Bluetooth Page.
    Registering And Connecting
    Add Device Page 
  3. Select the device from the list based on its Bluetooth ID (you can find the Bluetooth ID on the side of the product )
    Registering And Connecting
    Add via Bluetooth Page 
  4. Enter a name for the device and click Next.
    Registering And Connecting
  5. Configure Wi-Fi for the device:
    a.
    Select your Wi-Fi network in the first field.
    b. Enter the Wi-Fi password in the second field.
    c.
    Click Next.
    Registering And Connecting
    Wifi Configuration Page 
  6. Select CT
    If you want to use CT with Venus, click on your CT and then click Next. Otherwise, click Skip.
    Tip: Only one CT device should be used within the same WiFi network. Using multiple devices may cause
    Bluetooth interference, resulting in unstable connections or incorrect pairing.
    Registering And Connecting
    Select CT Page 
  7. Choose a Charge/Discharge Strategy Setting and click Configure.
    Registering And Connecting
    Charge/Discharge Strategy Setting Page
  8. OTA Upgrade
    Follow the on-screen instructions to upgrade the OTA to the latest version and click Done. (If it is already up to date, simply click Done.)
    Registering And Connecting
    OTA Upgrade Page

Display Information
Registering And Connecting
Registering And Connecting

Mode Setting

Self Consumption

  1. Click Settings on the top right corner.
    Registering And Connecting
  2. Click Charge/Discharge Strategy and Navigate to Charge/Discharge Strategy Setting Page.
    Registering And Connecting
    Settings Page 
  3. Select Self Consumption and Click Configure.
  4. Return to the Main Page to confirm the current power.
    Registering And Connecting

AI Optimization 

  1. Click Settings on the top right corner.
  2. Click Charge/Discharge Strategy and navigate to Charge/Discharge Strategy Setting Page.
  3. Select Al Optimization, choose your location and Click Configure.
    Registering And Connecting
  4. Return to the Main Page to confirm the current power.
  5. If you have not manually set the charging price, the grid will charge Venus when the actual electricity price is lower than the predicted lowest price.
    a. Click Earning on the Main Page to enter the Profit Statistics Page and view the predicted electricity price curve for today.
    b. The grid will charge Venus when the actual electricity price is lower than the predicted lowest price.
    Registering And Connecting
    Registering And Connecting
    Profit Statistics Page 
  6. If you have manually set the charging price, the grid will charge Venus when the actual electricity price is lower than the set price.
    a. Click Settings on the top right corner.
    b. Click Set Electricity Price and navigate to Set Electricity Price Page.
    Registering And Connecting
    c. Set Currency, Charging Price and Click OK.
    d. The grid will charge Venus when the actual electricity price is lower than the set price.
    Registering And Connecting
    Set Electricity Price Page 

Manual

  1. Click Settings on the top right corner.
  2. Click Charge/Discharge Strategy and navigate to Charge/Discharge Strategy Setting Page.
  3. Select Manual, Click+Add charge/discharge rules and navigate to Edit Page.
  4. Set the Start Time, End Time, Charge or Discharge Power, Days of the Week and Click OK.
  5. Click Configure.
  6. Return to the Main Page to confirm the current power.
    Registering And Connecting
    Edit Page 
    Registering And Connecting

Maintenance

Routine Maintenance 

  • Maintenance work must be performed by authorized personnel, and authorized personnel are responsible for reporting abnormalities.
  • When performing maintenance, be sure to wear personal protective equipment.
  • During normal operation of the MARSTEK VENUS, please check the environmental conditions regularly to ensure that the environmental conditions meet the requirements of the “Technical Specifications” and ensure that the equipment is not exposed to severe weather.
  • If you find any problem, do not use the device. Please wait until the problem is solved before resuming normal use.
  • Check the various components of the MARSTEK VENUS regularly every year to ensure that each component is in good condition and the heat dissipation components are not blocked in any way.
  • To clean the device, use a vacuum cleaner or a special brush.
Danger Do not dismantle the MARSTEK VENUS without authorization! To ensure safety and insulation performance, users are prohibited from repairing internal parts!
Warn The AC output harness (AC tapping cable on the MARSTEK VENUS) must not be replaced. If the wires are damaged, the device should be scrapped.
Warn Unless otherwise specified, the equipment must be disconnected from the grid (disconnect the socket).
Warn Never use rags made of filamentous or corrosive materials to clean the device, as this may generate static electricity or cause corrosion.
Warn Do not repair the product yourself. When repairing, use only qualified parts.
Tips Each branch line should be equipped with a circuit breaker, but it is not necessary to have a central protective device.

Trouble Shooting

Codes Alarm range Alarm status Suggested treatments
400 Inverter Side Overheat Protection
  1. Check whether the ventilation of the inverter installation location is good and whether the ambient temperature exceeds the maximum allowable ambient temperature range.
  2. If there is no ventilation or the ambient temperature is too high, please improve its ventilation and heat dissipation conditions.
  3. If the fault still exists or is triggered frequently, please contact the technical team.
401 Inverter Side Sell-test failed
  1. Please try to power off and restart.
  2. the fault is triggered frequently, please contact the technical team.
402 inverter Side Epsom read and
write exception
  1. Please try to power off and restart.I
  2. f the fault is triggered frequently, please contact the technical team.
405 inverter Side Off-grid output over-power protection
  1. The instantaneous power on the off-grid side is too high, please reduce the power consumption of the off-grid side.
  2. II it is still triggered under low power load, please contact the technical team.
410.430 Inverter Side Abnormality
within the device
  1. The inverter is abnormal inside. Wait hall a minute for the function to return to normal.
  2. II it is triggered frequently, try to power off and restart.
  3. If the fault is still triggered frequently, please contact the technical team.
431 BAT Side Unable to
communicate
with BMS
  1. It may be caused by low battery voltage. Connect and wait for 5 minutes to slowly activate the battery. It disappears after activating the battery.
  2. If the fault still exists or is triggered frequently, please contact the technical team.
432 BAT Side Battery overvoltage If the fault is triggered frequently, please clitact the technical team.
433 BAT Side Battery overcurrent ItIcithen.. fault is triggered frequently, please contact the technical
434 BAT Side Battery under voltage
  1. Please connect the grid-connected interface.
  2. If the fault is triggered frequently, please contact the technical team.
440/441 Grid Side Grid overvoltage
  1. Grid fluctuations and loose lines may trigger this fault.
  2. Check whether the grid is connected correctly and wait for the grid to return to normal.
Gird Side Grid under voltage
  1. Grid fluctuations and loose lines may trigger this fault
  2. Check whether the grid is connected correctly and wait for the grid to return to normal.
Grid Side Grid ova/frequency
  1. Grid fluctuations and loose lines may trigger this fault
  2. Check whether the grid is connected correctly and wait for the grid to return to normal.
Grid Side Grid cadet frerlueneY
  1. Grid fluctuations and loose lines may trigger this fault.
  2. Check whether the grid is connected correctly and wait for the grid to return to normal.
44) Grid Side Grid-connected
velour
  1. Please check whether the grid-side line connection is normal. If there is no problem, it will return to normal within one minute.
  2. Restart the inverter.
  3. If the fault still exists or is triggered frequently, please contact the technical team.
446 Grid Side Grid fluctuations
  1. Grid fluctuations and loose lines may trigger this fault.
  2. Check whether the grid is connected correctly and wait for the grid to return to normal
.:47 Inverter Side DCI protection/ Output DC component protection
  1. Grid fluctuations and loose lines may trigger this fault.
  2. Check whether the grid is connected correctly and wait for the grid to return to normal.
448 Inverter Side DCV protection/grid
voge directprotection
  1. Grid fluctuations and loose lines may trigger this fault.
  2. Check whether the grid is connected correctly and wait for the grid to return to normal.
510/558 Over temperature
limit
  1. Check whether the ventilation of the inverter installation location is good and whether the ambient temperature exceeds the maximum allowable ambient temperature range.
  2. there is no ventilation or the ambient temperature is too high. please improve its ventilation and heat dissipation conditions.
  3. If the fault still exists or is triggered frequently, please contact the technical team.
Low temperature
limit
  1. Check whether the ambient temperature meets the temperature requirements.
  2. If the ambient temperature is ncernal but the fault still exists or is triggered frequently, please contact the technical team.
560 Low battery
  1. It will be triggered when the battery power is too low, please connect the grid interface.
  2. If the fault still exists or is triggered frequently, please contact the technical team.
5C0 Bluetooth status
is abnormal
  1. Please check whether you are using the correct device and the APP to connect the device. The error will be automatically eliminated after a period of time.
  2. If the fault still exists or is triggered frequently, please contact the technical team.
5C1 OTA update failed
  1. It will be triggered when the OTA upgrade fails, and it will be automatically eliminated after a period of time after re-upgrading.
  2. If the fault still exists or is triggered frequently, please contact the technical team.
5C2/5C3
/5C4
Abnormal
WiFi signal
  1. Please check whether the WIFI connection between the device and the home network is normal.
  2. If the fault persists or is triggered frequently, please contact the technical team.
5C8-503 Network abnormal
  1. Check if your home network is normal. It may be triggered occasionally when the network fluctuates and will automatically disappear after a period of time.
  2. If the fault persists or occurs frequently, please contact the technical team.
5D2 CT connection
abnormality
  1. Please check whether the CT is properly connected to the home network and ensure the stability of the home network.
  2. If the fault still exists or is triggered frequently, please contact the technical team.

Technical Specifications

Specification Type MARSTEK VENUS-C MARSTEK VENUS-E
Battery Info
Rated Voltage 51.2V
Battery Energy 2560Wh 5120Wh
Life Cycle (Times) >6000(25°C)
Battery Type LiFePO4
Depth of Discharge 90%
Capacity 50Ah 100Ah
AC Input (On Grid)
Rated Power 2.5kW
Grid Connection Type L/N/PE
Rated Grid Voltage 230V
Grid Voltage Range 187V-253V
Rated Grid Frequency 50Hz
Rated Grid Current 10.9A
Power Factor >0.99(Default)/0.8 Leading~0.8 Lagging(Adjustable)
THDi <3percent
AC Output(Off Grid)
Rated Off-grid Output Power 2.5kVA
Max. Output Power 3.5kVA,10s
Rated Output Current 10.9A
Rated Output Voltage 230V
Rated Output Voltage Freq. 50Hz
THDu(Linear Load) <3percent
Efficiency
Battery-AC Side Max. Efficiency >93.5%
Protection
Protection level
Overvoltage/Voltage Withstand Level DC Ⅱ/AC Ⅲ
General Parameter
Isolation Type Isolated
Operating Temperature Range -20 ~+ 55℃(Store-30 ~+ 85℃)
Relative humidity 0-95%
Ingress Protection IP65
Cooling Strategy Natural Convection
Max. Operating Altitude 2000m
On-grid Connection Standard EN50549-1
Regulatory IEC62040、IEC62477
EMC IEC/EN 61000-6-1/-2/-3/-4
Dimension(L*W*H) 450*200*550mm 520*254*640mm
Weight 44.9kg 65kg
Addition Date
On-grid AC Connection Three-wire Household Plug(Euro16A)
Display LED
Supported Communication Interface WIFI&RS-485(Waterproof Aviation Plug)

Note 1: Rated voltage/frequency range can be changed according to the requirements of local power department.
Note 2: Please refer to local electrical regulations to determine the number of the MARSTEK VENUS that can be
connected to each branch.
*Enabling this function must comply with local regulations and must be performed by professional technicians!

Safety Information

Safety Precaution 

  • The MARSTEK VENUS series has been designed and tested in accordance with international safety standards. However, safety regulations must still be followed during the installation and operation of the MARSTEK VENUS series. Installers must carefully read, fully understand, and strictly comply with all instructions, precautions, and warnings in this installation manual.
  • It is strictly prohibited to reverse engineer, decompile, disassemble, adapt, implant, or perform any other derivative operations on the device software. Studying the internal implementation logic, obtaining the source code, infringing intellectual property rights in any way, or disclosing the results of software performance tests is also forbidden.
  • All operations including transportation, storage, installation, operation, use and maintenance must comply with applicable laws, regulations, standards and specifications.
  • This equipment must be used in an environment that meets the specified design conditions. Equipment failure, malfunction, or component damage caused by improper environments is not covered under the product’s quality assurance. The company will not be liable for any compensation related to personal injury, property loss, etc.

The Company shall not be liable for any of the following circumstances or their consequences: 

  • Equipment damage caused by natural disasters eg. earthquake, flood, volcanic eruption, mudslide, lightning strike, fire, war, armed conflict, typhoon, hurricane, tornado, extreme weather, or force majeure events.
  • Failure to operate the equipment within the conditions specified in this manual.
  • Installation and usage in environments that do not comply with relevant international, national, or regional standards. Installation or operation of the equipment by unqualified personnel.
  • Failure to follow the operating instructions and safety warnings provided in the product documentation.
  • Unauthorized disassembly, modification of the product, or changes to the software code.
  • Damage caused during transportation by you or a third party entrusted by you.
  • Damage resulting from storage conditions that do not meet the product documentation requirements.
  • Use of materials and tools that do not comply with local laws, regulations, or applicable standards.
  • Damage caused by negligence, intentional misconduct, gross negligence, improper operation, or any other reasons not attributable to the company.

Personal Safety

  • Ensure that power is turned off before installation, Do not install or remove cables while the power is on.
  • Non-standard or improper operation on energized equipment may result in fire, electric shock, or explosion, causing property damage, personal injury, or even death.
  • Before beginning any operation, remove conductive objects such as watches, bracelets, rings, and necklaces to avoid electric shock.
  • Use dedicated insulated tools during operation to prevent electric shock or short circuits.
  • Do not make contact with other conductors or indirectly contact power supply equipment through damp or wet objects.
  • Do not power on the equipment until it has been correctly installed or confirmed by a professional.
  • Only qualified professionals or properly trained personnel are allowed to install, operate, or maintain this equipment.
  • if there is any risk of personal injury or equipment damage during operation, stop immediately and report the situation.
  • Do not touch the equipment when energized, as its surface may be hot.

Electricity Safety

  • Before installation, ensure that the equipment is intact. Otherwise, electric shocks or fires may occur.
  • Non-standard and improper operations may result in fire or electric shocks.
  • Prevent foreign matter from entering the equipment during operations.
  • For the equipment that needs to be grounded, install the ground cables first when installing the equipment and remove the ground cables last when removing the equipment.
  • Disconnect the equipment and its switches before installing or removing any power cables.
  • Do not damage the grounding conductors.
  • Equipment terminals should only be used for electrical connections.
  • Ensure all electrical connections comply with local electrical codes and standards.
  • Approval from the local utility company must be obtained before operating in grid-tied mode.
  • Use dedicated insulated tools for all high-voltage operations.
  • Repairs must be performed with qualified and compliant parts, installed by an authorized contractor or service representative of Marstek Energy Co., Limited. These parts may only be used for their intended purpose.
  • Do not expose the equipment to flammable or explosive gas or smoke. Do not perform any operation on the equipment in such environments.
  • Do not store any flammable or explosive materials near the equipment.
  • Install the equipment in a dry, well-ventilated area, away from any liquids.
  • Ensure ventilation openings or heat dissipation systems are not blocked to prevent overheating or fire.

Mechanical Safety

  • Do not drill holes into the equipment.
  • Wear goggles and protective gloves when drilling holes.
  • Be cautious to avoid injury when moving heavy objects.

Appendix

What’s in the box

  • VENUS×1
    Venus
  • AC Cable×1
    AC Cable
  • Warranty Card×1
    Warranty Card
  • 485 Cable×1
    485 Cable
  • Omni Wheel×4
    Omni Wheel
  • Handle×2
    Handle

MARSTEK Logo

Documents / Resources

MARSTEK MST-BIE2.5-2500,MST-BIE5-2500 Solar Inverters Energy [pdf] User Manual
MST-BIE2.5-2500, MST-BIE5-2500, MST-BIE2.5-2500 MST-BIE5-2500 Solar Inverters Energy, MST-BIE2.5-2500 MST-BIE5-2500, Solar Inverters Energy, Inverters Energy, Energy

References

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