Description
ATMOCE M-ELV 7 kWh Battery | MS-7K-U
The ATMOCE M-ELV MS-7K-U 7 kWh battery is an AC-coupled energy storage solution designed to improve energy utilisation and simplify the addition of battery storage to existing photovoltaic installations. Its compatibility with third-party PV and energy management systems allows storage to be added while retaining the existing inverter, depending on the installation configuration.
It incorporates lithium iron phosphate (LFP) cells, a maximum internal voltage of 28.8 V DC and galvanic isolation between the battery and the grid. The same model can be integrated into single-phase and three-phase installations, with a maximum continuous output power of 4.5 kVA and a maximum output power of 5 kVA.
Select the appropriate energy management kit
To integrate this battery with an existing inverter, the ATMOCE MA-ESSKits-S kit for single-phase installations or the MA-ESSKits-T kit for three-phase installations is required. These kits are sold separately. For backup power during grid outages, the M-Backup MU100-S or MU100-T must also be added, depending on the installation type.
Key features
7 kWh of energy storage
A nominal capacity of 7 kWh for storing energy and using it when photovoltaic generation and consumption do not coincide.
AC coupling
Integration with third-party photovoltaic systems to add storage to existing installations, depending on the system design.
LFP technology and extra-low voltage
Lithium iron phosphate chemistry, cell-level management and an internal voltage below 30 V DC, with galvanic isolation from the grid.
One battery for single-phase and three-phase systems
The MS-7K-U model can be used with either grid configuration by selecting the corresponding management and backup components.
Energy management and monitoring
Self-consumption and time-of-use (TOU) modes, with monitoring via ATMOCE Cloud and ATMOZEN through the ATMOCE gateway.
IP66 protection and flexible mounting
An IP66-rated enclosure with wall or floor mounting options to suit the available space, following the manufacturer’s installation instructions.
Technical specifications
Capacity and performance
| Parameter | MS-7K-U |
|---|---|
| Product range | ATMOCE M-ELV |
| Nominal capacity | 7 kWh |
| Battery chemistry | Lithium iron phosphate (LFP) |
| Coupling type | Alternating current (AC) |
| Maximum continuous output power | 4.5 kVA |
| Maximum output power | 5 kVA |
| Maximum continuous input power | 3.75 kVA |
| AC round-trip efficiency | 90%* |
| DC round-trip efficiency | 96%** |
| Ingress protection rating | IP66 |
| Dimensions without bracket (height × width × depth) | 830 × 480 × 195 mm |
| Weight without bracket | 73.5 kg |
* AC efficiency measured under laboratory conditions at a charge and discharge rate of 0.1 C. ** DC efficiency measured under laboratory conditions at a charge and discharge rate of 0.2 C. Power values are expressed in kVA, as specified in the datasheet.
Electrical specifications and grid connection
- Single-phase grid: 220 / 230 V AC, 1/N/PE.
- Three-phase grid: 220/380 or 230/400 V AC, 3/N/PE.
- Operating voltage range between phase and neutral: 176–276 V AC.
- Nominal frequency: 50 / 60 Hz.
- Frequency range: 45–55 Hz at 50 Hz; 55–65 Hz at 60 Hz.
- Maximum input current at 230 / 400 V: 16.30 A single-phase / 5.41 A three-phase.
- Maximum output current at 230 / 400 V: 21.74 A single-phase / 7.25 A three-phase.
- Adjustable power factor: 0.8 capacitive to 0.8 inductive.
- Total harmonic current distortion (THDi): below 3%.
- Nominal capacity: 280 Ah.
- Nominal internal voltage: 25.6 V DC.
- Maximum internal voltage: 28.8 V DC.
The 25.6 V voltage refers to the internal battery. The unit connects to the installation on the AC side.
Installation and operating conditions
- Mounting: floor or wall mounting.
- Operating ambient temperature: −20 to +55 °C.
- Optimal operating temperature: 0 to +30 °C.
- Storage temperature: −20 to +55 °C.
- Cooling: intelligent air cooling.
- Operating noise: below 35 dB.
- Operating relative humidity: 4–100%, condensing.
- Maximum altitude: 3,000 m.
- Protection class: I.
- Pollution degree: PD3.
Energy management, communication and expansion
- Battery communication: CAN.
- Monitoring: ATMOCE Cloud and the ATMOZEN app via the ATMOCE gateway.
- Modes and services: self-consumption, time-of-use (TOU) management and grid ancillary services, depending on configuration and availability.
- Indicators: status and state-of-charge (SOC) LEDs.
- Scalability stated by the manufacturer: up to 126 kWh with one M-Gateway, subject to system design and installation limits.
Required components and backup option
- Single-phase installation with an existing inverter: MS-7K-U battery and MA-ESSKits-S management kit.
- Three-phase installation with an existing inverter: MS-7K-U battery and MA-ESSKits-T management kit.
- Single-phase backup: add M-Backup MU100-S.
- Three-phase backup: add M-Backup MU100-T.
The management kits and M-Backup boxes are sold separately. The battery alone does not constitute a complete management and backup system.
The available power and runtime during a grid outage depend on the number of batteries, their state of charge and the connected loads. Integration of the third-party PV inverter during backup operation must be verified for each configuration.
Warranty and service life
- Warranty stated in the datasheet: 15 years.
- Stated cycle life: 10,000 cycles.
Warranty coverage is subject to ATMOCE’s terms and conditions. The stated cycle life does not constitute a guarantee of constant capacity throughout the unit’s service life.
Protection and regulatory compliance
- Galvanic isolation: between the battery and the grid.
- Insulation resistance monitoring: integrated.
- AC surge protection: Type II.
- AC port overvoltage category: III.
- Standards listed in the datasheet: IEC 62619, ISO 13849, IEC 61000-6-1, IEC 61000-6-3, IEC 63056, IEC 62477-1 and VDE-AR-E 2510-50.
ATMOCE storage for professional installations
The ATMOCE MS-7K-U combines LFP storage, AC coupling and energy management for self-consumption projects that require battery integration or increased storage capacity. Its single-phase or three-phase configuration and the option to add M-Backup allow the solution to be adapted to the project’s requirements.
At Vico Export Solar Energy, we supply photovoltaic equipment to installers, engineering companies and distributors. Check the availability of the battery and its complementary components to prepare a complete solution, with domestic and international supply.
Consult the documentation for the ATMOCE M-ELV MS-7K-U battery or contact our team to select the appropriate management kit and backup option for your installation.
