POWERTIME / BACKUP POWER FOR YOUR HOME
MARSTEK Venus-E V3.0
More stability for your home. More peace of mind during outages.
A home energy storage and backup power system for an apartment or house. It charges from the grid and, in a compatible backup setup, powers essential devices when the power goes out.
- 5.12 kWhCapacity: the battery's stored energy
- 2500 WPower: rated backup load
- LiFePO₄Battery type: 6000+ cycles, DoD up to 90%
Price: 62,000 ₴
Delivery time up to 21 days · Payment by card online or bank transfer (IBAN)
HOW THE BACKUP WORKS
What happens when the power goes out
Venus-E connects to your home's electrical grid and a backup circuit. While the power is on, the station charges. When it goes out, in a compatible backup setup it powers the backup circuit from its battery.
- RouterRunning
- LightingRunning
- FridgeRunning
Power is on: Venus-E is charging and, in a compatible backup setup, powers the backup circuit together with the grid.
Power is out: in a compatible backup setup the backup circuit runs on Venus-E's battery while there is charge.
Important conditions
- In a compatible backup setup with the SmartBox, switching to battery takes about 20 ms (per the manufacturer).
- Without a SmartBox, Venus-E only powers a separate backup circuit through its own backup socket, not the whole apartment or house.
- Internet access also depends on your provider's network, not just the router and the station.
CALCULATOR
How long will it last for you?
Pick a scenario or build your own set. The estimate is approximate and works for any device on the backup circuit - from a router and a fridge to a boiler, a pump or a workstation.
Devices
The list is empty. Add a device or pick a scenario.
Wattages in the scenarios are illustrative examples, not measurements. For the PC we used a gaming load, not the power supply rating: an 850 W PSU does not mean the PC draws 850 W. Enter the values for your own devices.
“Works, % of time” is the share of time a device really draws the stated power: a kettle - a few minutes a day, a boiler or router - all the time. The runtime uses the average consumption, while the 2500 W check uses the power of all devices that may switch on at the same time.
A fridge runs in cycles: we use the average taken from its daily consumption (printed on the label), and the compressor's starting current must be checked separately. The station's short-term peak power is up to 3.5 kVA (10 s) - enough for most fridges, but this is not a guarantee of compatibility.
The sum of the power of all devices that will run at the same time.
Pick a duration and we will show whether the charge is enough.
Result
Within the rating: 7% of 2500 W.
For small loads the station's own consumption noticeably cuts the runtime, so the real result may be much lower.
How we calculate
We take the battery's rated capacity of 5.12 kWh, a depth of discharge (DoD) of up to 90% and a battery-to-AC conversion efficiency of about 93.5% (per the manufacturer's spec), plus the share of charge you choose (from the starting level to your reserve). Together that gives roughly ≈4.3 kWh of usable energy at a full charge. This is our estimate, not a manufacturer guarantee: real runtime depends on the load, temperature, operating mode and battery condition.
A sum of watts does not prove compatibility: starting current and device type matter too, and backup power only works in a compatible backup setup. We check that during a consultation.
LOOK AT THE DETAILS
What is on the station's body
Tap a number on the photo or an item in the list. Explanations follow the manufacturer's official specifications.
CAPABILITIES
What the station does for your home and beyond
Backup power for an apartment or house, a gaming PC, a workspace and important household devices. Conditions and limits are listed next to each capability.
5.12 kWh of stored energy
The LiFePO₄ battery's rated capacity. The energy actually usable for a load is lower - it accounts for DoD and conversion efficiency (see the calculator).
Note: Real runtime depends on the load, temperature and battery condition.
2500 W of backup power
The rated power of the backup output. Short-term peak is up to 3.5 kVA for 10 seconds (per the manufacturer's spec).
Note: This is not a portable station with several free sockets: power runs through a backup circuit or a compatible backup setup.
Backup during an outage
In a compatible backup setup with the SmartBox, the station powers the backup circuit when the grid goes out.
Note: Switching takes about 20 ms per the manufacturer; without a SmartBox, backup is limited to the separate backup output.
LiFePO₄, 6000+ cycles, 90% DoD
Battery chemistry and lifespan per the manufacturer's spec: over 6000 charge-discharge cycles at 25 °C, depth of discharge (DoD) up to 90%.
Note: Cycle life is a manufacturer figure under defined conditions; real lifespan depends on how you use it.
IP65 enclosure protection
Protected against dust and water jets, cooled by natural convection with no active fan. Operating temperature from -20 to +55 °C (per the manufacturer's spec).
Note: IP65 covers the station's enclosure; still choose an installation spot sheltered from direct rain.
Smart control and scaling
Wi-Fi, Bluetooth and RS485, the MARSTEK app, and the CT002 smart meter for 100% self-consumption mode. Up to 3 units in parallel on one phase - 7.5 kW / 15.36 kWh.
Note: A CT002 meter is required for anti-feed-in; whether it is included depends on the supplier - we confirm before you order.
THOUGHT THROUGH IN DETAIL
Built for a fixed installation
This is not a portable station: Venus-E weighs about 60 kg and connects to the electrical grid and a backup circuit. Plan the spot in advance and keep ventilation clear.
- 3Dimensions 480 × 153 × 624 mmA compact profile for installing near a wall. Cooled by natural convection with no active fan, so keep the space clear.
SPECIFICATIONS
Full specifications from the official manufacturer data
Source: the official MARSTEK Venus-E V3.0 specification (model MST-BIE5-2500). Values taken only from the manufacturer's documentation are marked.
Power and capacity are different things
Sets the load the station can carry at any moment: how many devices it can power at once. Here it is 2500 W rated (up to 3.5 kVA for 10 seconds, short-term).
Sets the stored energy, and therefore the runtime. Here it is 5.12 kWh of rated battery capacity. The smaller the load, the longer the station runs.
Battery
- Capacity
- 5120 Wh (51.2 V, 100 Ah)
- Battery type
- LiFePO₄ (LFP)
- Depth of discharge (DoD)
- up to 90%
- Lifespan
- over 6000 cycles at 25 °C (manufacturer spec)
- Battery-to-AC efficiency
- at least 93.5% (manufacturer spec)
Outputs
- Rated backup output power
- 2500 W
- Short-term peak power
- up to 3.5 kVA for 10 s (manufacturer spec)
- Rated voltage / frequency
- 230 V, 50 Hz
- Waveform
- pure sine wave
- Backup output
- Schuko-type socket (manufacturer spec)
Charging
- Charging method
- From the home electrical grid (AC-coupled), rated input power 2500 W (manufacturer spec)
- Solar system compatibility
- Works alongside a compatible home solar system through the grid; there is no direct solar (MPPT) input
- Anti-feed-in / 100% self-consumption
- With the MARSTEK CT002 smart meter (Shelly meters are also compatible)
Control
- Remote control
- Wi-Fi, Bluetooth, RS485, LAN; the MARSTEK app
- Display
- LED indicators (no screen)
- Operating modes
- AI optimization, self-consumption, manual (manufacturer spec)
- Backup power
- in a compatible setup with the SmartBox, switching takes ≈20 ms (per the manufacturer)
Size and weight
- Dimensions
- 480 × 153 × 624 mm
- Weight
- 60 ± 0.5 kg
- Enclosure protection
- IP65
- Operating temperature
- -20 to +55 °C (manufacturer spec)
Expansion
- Parallel connection
- up to 3 units on one phase - 7.5 kW / 15.36 kWh (manufacturer spec)
- Three-phase setup
- up to 9 units total - 22.5 kW / 46.08 kWh (manufacturer spec)
- Smart meter
- MARSTEK CT002 - for anti-feed-in and 100% self-consumption
The number of units, the SmartBox and the smart meter depend on your needs and what the supplier offers. We confirm the exact configuration before you order.
PURCHASE TERMS
What to know before you order
QUESTIONS AND ANSWERS
Frequently asked questions
What is MARSTEK Venus-E V3.0?
A home AC-coupled energy storage and backup power system: a 5.12 kWh LiFePO4 battery that connects to your home's electrical grid. It is not a portable power station - it is installed as a fixed unit.
How much battery capacity does it have?
5120 Wh (51.2 V), LiFePO4 chemistry, depth of discharge (DoD) up to 90%. Accounting for DoD and the battery-to-AC conversion efficiency (about 93.5%), roughly 4.3 kWh is actually usable - calculate your own case in the calculator.
How much power does the system deliver?
The rated backup output is 2500 W, with a short-term peak of up to 3.5 kVA for 10 seconds (per the manufacturer's spec).
What can I connect, and is 2500 W enough for a gaming PC?
For a typical gaming PC + monitor + router set (about 452 W), 2500 W is well within range. But the station powers a backup circuit or a compatible backup setup, not any random socket: calculate your own set in the calculator or send us the details.
How does backup power work?
In a compatible backup setup with the SmartBox, the station switches to battery in about 20 ms per the manufacturer and powers the backup circuit. Without a SmartBox, backup is limited to a separate backup socket, not the whole apartment or house.
Does it work for an apartment or a private house?
Yes, for both - what matters is having a fixed installation spot near the electrical panel and clear ventilation access. We confirm the exact connection scheme before you order.
Is it compatible with solar panels?
Yes, Venus-E is an AC-coupled system: it works alongside a compatible home solar system through the grid and stores excess generation. The station itself has no direct solar (MPPT) input.
Can I control it from my phone? What is the CT002?
Yes, through the MARSTEK app (Wi-Fi/Bluetooth). The CT002 is a MARSTEK smart meter for anti-feed-in and 100% self-consumption mode; it is needed for some operating modes and may be included or sold separately depending on the supplier.
How many cycles does the battery have, and can I add more capacity?
Over 6000 charge-discharge cycles at 25 °C (manufacturer spec). Capacity scales: up to 3 units on one phase (7.5 kW / 15.36 kWh), or up to 9 units total with a three-phase connection (22.5 kW / 46.08 kWh).
Where can I buy the MARSTEK Venus-E V3.0 in Ukraine?
You can buy the MARSTEK Venus-E V3.0 on powertime.me: the station is in stock at UAH 62,000. Delivery across Ukraine is by Nova Poshta to a cargo branch or to your address within 21 days, and the delivery cost is paid by the buyer at the carrier's rates. Pay by card online (LiqPay) or by an IBAN invoice. A fiscal receipt is issued for every order.
What is the price, and how do I order?
UAH 62,000. Place the order right on the site: choose Nova Poshta delivery and a payment method - card online or an IBAN invoice. The station is in stock and delivery takes up to 21 days. If you need advice on contents, a SmartBox or a meter, choose “Need a consultation”.
POWERTIME
Calculate your setup and get the price
Pick a scenario, see the estimated runtime and place your order. In stock, delivery takes up to 21 days.
POWERTIME - Powering it back.