Comparison Marstek Venus E Gen 3.0 vs EcoFlow STREAM Pro
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|---|---|---|
| Marstek Venus E Gen 3.0 | EcoFlow STREAM Pro | |
from $1,807.89 up to $1,997.66 | Outdated Product | |
| User reviews | ||
| TOP sellers | ||
Energy independence system for the home with expandable capacity up to 46.08 kWh. Operates on the Plug & Play principle. Integration with solar systems, supports compensation of three-phase networks. Smart energy management through AI Optimization. System expansion is implemented through Marstek SmartBox. | Energy independence system for home. Built-in Lithium Iron Phosphate (LiFePO4) battery module 19.2 V (100 Ah). Output power to grid 800 W and 2 sockets 1200 W. STREAM Pro and Delta Lite have the same features. The name Delta Lite can be used for marketing purposes. The Lite mode is set through the mobile app, in which the device operates as a charging station. | |
| Device type | hybrid inverter | hybrid inverter |
| In box | with battery pack | with battery pack |
| Network type | 1 phase (230 V) | 1 phase (230 V) |
| Maximum efficiency | 93.5 % | |
AC output | ||
| Rated power | 2.5 kVA | 1.2 kVA |
| Rated power | 2.5 kW | 1.2 kW |
| Peak power | 3.5 kW | |
| Rated AC current | 10.9 A | 5.22 A |
| Output waveform | pure sine | pure sine |
| Number of sockets | 1 | 2 |
Batteries and DC charging | ||
| Connection voltage | 51.2 В | |
| Total battery capacity | 100 Ah | 100 Ah |
| Total battery capacity | 5120 Wh | 1920 Wh |
Solar PV panels | ||
| Max. power | 1.5 kW | |
| Operating voltage PV | 15 – 60 В | |
| Short circuit current | 20 А | |
| Controller | 3xMMPT | |
| Number of strings | 1 | |
Features and control | ||
| Functions | UPS function parallel connection built-in monitoring | UPS function parallel connection built-in monitoring |
| Control interfaces | Bluetooth Wi-Fi RS485 | Bluetooth Wi-Fi |
| Protection | short circuit protection ↑ or ↓ battery voltage protection overload protection overheat protection | reverse polarity protection short circuit protection ↑ or ↓ battery voltage protection overload protection overheat protection |
General | ||
| Display | in absent | in absent |
| Cooling | passive | passive |
| Noise level | 30 dB | 30 dB |
| Casing protection class | IP65 | IP65 |
| Operating temperature | -20 °C ~ +55 °C | -20 °C ~ +55 °C |
| Dimensions (HxWxD) | 624x480x153 mm | 458x255x284 mm |
| Weight | 60 kg | 22.8 kg |
| Added to E-Catalog | february 2026 | august 2025 |
Compare Marstek Venus E Gen 3.0 and EcoFlow STREAM Pro
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Glossary
Maximum efficiency
Inverter efficiency for solar panels.
The efficiency indicator is the percentage ratio between the amount of energy that the device delivers to the load and the energy consumed from the solar panel. The higher this parameter, the more efficient the operation of the device and the lower the losses during conversion. In modern inverters for solar panels, efficiency values of up to 90% are considered average, and above 90% are considered good.
The efficiency indicator is the percentage ratio between the amount of energy that the device delivers to the load and the energy consumed from the solar panel. The higher this parameter, the more efficient the operation of the device and the lower the losses during conversion. In modern inverters for solar panels, efficiency values of up to 90% are considered average, and above 90% are considered good.
Rated power
The nominal power in kVA shows the total electrical load that an inverter can handle in terms of voltage and current, taking into account the characteristics of the connected devices. This parameter is especially important for equipment with motors, transformers, compressors, and other reactive loads, where consumption does not always equal useful power in kW.
kVA should not be directly equated to kW: at a power factor of 0.8, a 5 kVA device is actually designed for approximately 4 kW of active load. For example, a pump, air conditioner, or refrigeration compressor may load the inverter more in kVA terms than it seems based on their usual power in watts.
kVA should not be directly equated to kW: at a power factor of 0.8, a 5 kVA device is actually designed for approximately 4 kW of active load. For example, a pump, air conditioner, or refrigeration compressor may load the inverter more in kVA terms than it seems based on their usual power in watts.
Rated power
The rated power in kW indicates the active load that an inverter or controller can reliably handle in operational mode. This value is closest to the actual consumption of household appliances such as refrigerators, pumps, boilers, lighting, and power tools.
Unlike peak power, the rated power is not calculated for short bursts, but for prolonged operation without overheating and overloading. For example, a 5 kW inverter can supply several devices with a total continuous consumption up to this level, but for a motor or pump, it is advisable to leave a margin for the starting current.
Unlike peak power, the rated power is not calculated for short bursts, but for prolonged operation without overheating and overloading. For example, a 5 kW inverter can supply several devices with a total continuous consumption up to this level, but for a motor or pump, it is advisable to leave a margin for the starting current.
Peak power
The maximum active load that the inverter can withstand briefly, usually during the startup of equipment. This reserve is needed for devices with a high starting current: pumps, refrigerators, compressors, power tools.
Unlike nominal power, peak power is not designed for continuous operation and lasts only a few seconds or even fractions of a second. For example, an inverter with a nominal power of 5 kW and a peak power of 10 kW can briefly handle the startup of a pump, but it should not continuously supply a load of 10 kW.
Unlike nominal power, peak power is not designed for continuous operation and lasts only a few seconds or even fractions of a second. For example, an inverter with a nominal power of 5 kW and a peak power of 10 kW can briefly handle the startup of a pump, but it should not continuously supply a load of 10 kW.
Rated AC current
The current strength that the device is capable of stably and safely delivering when operating in rated mode (i.e. for the longest possible time without the risk of overloads and failures). The indicator is expressed in Amperes (A).
Number of sockets
The number of standard 230 V sockets provided in the inverter design.
The more sockets there are, the more electrical appliances can be connected to the inverter at once. At the same time, the specificity of using inverters is such that they rarely have to be used for several devices at once. In addition, simultaneous connection requires appropriate power (see “Rated output power”), and the sockets themselves also significantly affect the dimensions. Therefore, most often in modern home inverters one socket is used – this, usually, is enough. However, high-quality powerful inverters can have two sockets.
The more sockets there are, the more electrical appliances can be connected to the inverter at once. At the same time, the specificity of using inverters is such that they rarely have to be used for several devices at once. In addition, simultaneous connection requires appropriate power (see “Rated output power”), and the sockets themselves also significantly affect the dimensions. Therefore, most often in modern home inverters one socket is used – this, usually, is enough. However, high-quality powerful inverters can have two sockets.
Connection voltage
The efficiency of the solar system, laid down by the manufacturer of the inverter, directly depends on this parameter. The following battery voltage options are most widely used: 12 V, 24 V and 48 V.
Total battery capacity
The total capacity of the connected batteries in watt-hours (Wh). In fact, this is the amount of energy that is supposed to be stored in the battery. The larger the capacity, the longer the battery life of the connected equipment will be, all other things being equal. On the other hand, this parameter also affects the dimensions, weight and price of the battery. Based on the capacity in watt-hours, batteries can be compared with each other.
Max. power
The maximum allowable input power from solar panels, expressed in kilowatts (kW). Let us remember that 1 kW contains 1000 W.
When selecting an inverter based on this indicator, they are based on the total power of the solar panels involved in generating electricity. Moreover, it often makes sense to select models with an inverter input power slightly less than the maximum power of solar panels - for example, if they are shaded part of the time or for other reasons do not receive enough sunlight during the day. The power of the solar battery should not exceed the power of the inverter by more than 30%. However, for some inverters the excess can be only 10%, while for others it can be up to 100%. It is better to clarify this point in advance.
When selecting an inverter based on this indicator, they are based on the total power of the solar panels involved in generating electricity. Moreover, it often makes sense to select models with an inverter input power slightly less than the maximum power of solar panels - for example, if they are shaded part of the time or for other reasons do not receive enough sunlight during the day. The power of the solar battery should not exceed the power of the inverter by more than 30%. However, for some inverters the excess can be only 10%, while for others it can be up to 100%. It is better to clarify this point in advance.