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MARSTEK MST-BIE2.5-2500,MST-BIE5-2500 Solar Inverters Energy User Manual
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 |
| 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) |
Interface Introduction
The interface layout and definition for the MARSTEK Venus Series are the same for both the Venus-C and Venus-E models.
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.
- Error.
- Grid port on.
- Backup port on.
- Capacity Indicator. Flashing from left to righ in charging, right to left in discharging.
- CT(Current Transformer) connected.
- WiFi connected.
- 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.
Whole-house Backup Solution
The MARSTEK Venus Series products can also work in coordination with the MARSTEK Smartbox to provide whole-home backup power.
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:
Be flame-retardant.
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.
- 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
Omni Wheel×4
Handle×2
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
Wrench
Diagonal pliers
Insulating gloves
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.
Step 2
- Needed: Wheels, screws, a screwdriver.
- Actions: Install the wheels with a screwdriver, using provided screws.
Step 3
- Needed: the Venus device.
- Actions: Pull up the Venus device, ensure the wheels can normally function.
Step 4
- Needed: the Venus device, handles, a screwdriver.
- Actions: Install the handle with a screwdriver, using the provided screws.
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.
MARSTEK App for Smart Control
QR Code Installation
Scan the QR code to download the app.
APP Download
Registering and Connecting
First Step: Switch Server
- Select your current location from the list.
- Click OK to proceed, and you will be redirected to the Login Page.
Second Step: Login Page/Register Page/Forgot Password Page
- Login Page
- If you haven’t registered before, click Register to go to the Register Page.
- If you forgot your password, click Forgot Password to go to the Forgot Password Page.
- Enter your email and password.
- Click Login to proceed.
- If your email and password are correct, you will be redirected to the Main Page.
Login Page
- Register Page
- Enter your email in the first field.
- Click Get Verification Code and check your inbox (including spam) for the code.
- Enter the verification code in the second field.
- 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. - Read and agree to the User Privacy Agreement by checking the box.
- Click Register.
- Upon successful registration, you will be redirected to the Login Page.
Register Page
- Forgot Password Page
- Enter your email in the first field.
- Click Get Verification Code and check your inbox (including spam) for the code.
- Enter the verification code in the second field.
- Set a new password in the third field.
- Click Reset Password.
- A success message will appear, and you will be redirected to the Login Page.
Forgot Password Page
Third Step: Add Device
- Click Add Device in the top left corner to go to the Add Device Page.
- Click Add via Bluetooth to proceed to the Add via Bluetooth Page.
Add Device Page - Select the device from the list based on its Bluetooth ID (you can find the Bluetooth ID on the side of the product )
Add via Bluetooth Page - Enter a name for the device and click Next.
- 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.
Wifi Configuration Page - 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.
Select CT Page - Choose a Charge/Discharge Strategy Setting and click Configure.
Charge/Discharge Strategy Setting Page - 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.)
OTA Upgrade Page
Display Information
Mode Setting
Self Consumption
- Click Settings on the top right corner.
- Click Charge/Discharge Strategy and Navigate to Charge/Discharge Strategy Setting Page.
Settings Page - Select Self Consumption and Click Configure.
- Return to the Main Page to confirm the current power.
AI Optimization
- Click Settings on the top right corner.
- Click Charge/Discharge Strategy and navigate to Charge/Discharge Strategy Setting Page.
- Select Al Optimization, choose your location and Click Configure.
- Return to the Main Page to confirm the current power.
- 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.
Profit Statistics Page - 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.
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.
Set Electricity Price Page
Manual
- Click Settings on the top right corner.
- Click Charge/Discharge Strategy and navigate to Charge/Discharge Strategy Setting Page.
- Select Manual, Click+Add charge/discharge rules and navigate to Edit Page.
- Set the Start Time, End Time, Charge or Discharge Power, Days of the Week and Click OK.
- Click Configure.
- Return to the Main Page to confirm the current power.
Edit Page
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 |
|
| 401 | Inverter Side | Sell-test failed |
|
| 402 | inverter Side | Epsom read and write exception |
|
| 405 | inverter Side | Off-grid output over-power protection |
|
| 410.430 | Inverter Side | Abnormality within the device |
|
| 431 | BAT Side | Unable to communicate with BMS |
|
| 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 |
|
| 440/441 | Grid Side | Grid overvoltage |
|
| Gird Side | Grid under voltage |
|
|
| Grid Side | Grid ova/frequency |
|
|
| Grid Side | Grid cadet frerlueneY |
|
|
| 44) | Grid Side | Grid-connected velour |
|
| 446 | Grid Side | Grid fluctuations |
|
| .:47 | Inverter Side | DCI protection/ Output DC component protection |
|
| 448 | Inverter Side | DCV protection/grid voge directprotection |
|
| 510/558 | Over temperature limit |
|
|
| Low temperature limit |
|
||
| 560 | Low battery |
|
|
| 5C0 | Bluetooth status is abnormal |
|
|
| 5C1 | OTA update failed |
|
|
| 5C2/5C3 /5C4 |
Abnormal WiFi signal |
|
|
| 5C8-503 | Network abnormal |
|
|
| 5D2 | CT connection abnormality |
|
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 | Ⅰ | ||
| 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
- AC Cable×1
- Warranty Card×1
- 485 Cable×1
- Omni Wheel×4
- Handle×2
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 |