Mercury 261
Storage system 261 kWh, 125 kW, lithium iron phosphate cell 314 Ah, 832 V nominal, 1.44 square metre footprint.
CESC battery storage
261kWh
- 125 kW of power
- LFP cell, 314 Ah, 832 V
- Footprint of 1.44 m²
Sold, delivered, installed and commissioned by Alpha Service 33, throughout France.
Manufacturer data sheet provided with the quote.
Specifications
| Specification | Value | Source |
|---|---|---|
| Electrical | ||
| Capacity | 261 kWh | CESC manufacturer |
| Power | 125 kW, external hybrid inverter | CESC manufacturer |
| Cell | LFP 314 Ah | CESC manufacturer |
| Nominal DC voltage | 832 V | CESC manufacturer |
| Grid connection | 400 V three-phase, 3P+N+PE | European distributor |
| Solar oversizing | native 2:1 ratio, integrated transfer switch | CESC manufacturer |
| Mechanical | ||
| Footprint | 1.44 m² | CESC manufacturer |
| Ingress protection | IP55 | European distributor |
| Environment | ||
| Anti-corrosion | up to C5, coastal sites | CESC manufacturer |
| Standards cited | ||
| Standards | UN 38.3, IEC 62619, IEC 63056, IEC 61000, IEC 62477 | Manufacturer documentation |
- Capacity
- 261 kWh
- CESC manufacturer
- Power
- 125 kW, external hybrid inverter
- CESC manufacturer
- Cell
- LFP 314 Ah
- CESC manufacturer
- Nominal DC voltage
- 832 V
- CESC manufacturer
- Grid connection
- 400 V three-phase, 3P+N+PE
- European distributor
- Solar oversizing
- native 2:1 ratio, integrated transfer switch
- CESC manufacturer
- Footprint
- 1.44 m²
- CESC manufacturer
- Ingress protection
- IP55
- European distributor
- Anti-corrosion
- up to C5, coastal sites
- CESC manufacturer
- Standards
- UN 38.3, IEC 62619, IEC 63056, IEC 61000, IEC 62477
- Manufacturer documentation
Electrical
Mechanical
Environment
Standards cited
Specifications recorded on 15/09/2026. Source given line by line. The precise source is provided with the quote.
Specifications taken from CESC manufacturer documentation. Full datasheets are provided with the quote.
This document is a record drawn up by Alpha Service 33 on the date shown, from the sources cited next to each value. It is not a manufacturer data sheet and does not replace one. The contractual characteristics are those of the quote.
What the manufacturer highlights
The Mercury 261, as CESC presents it
- 314 Ah
- Lithium iron phosphate cells
- 24 hours a day
- Operating conditions, seven days a week
- 3 levels
- Of fire protection
- 100%
- Of cells monitored for temperature
- 1.5 hours
- Of fire resistance at cabinet level
- Three-phase
- Unbalanced three-phase output permitted
- 1 year
- Of local data retention
- C4
- Anti-corrosion class, beyond 5 km from the coastline
Manufacturer CESC, September 2026 data sheets
The enclosure and the climate
Anti-corrosion class C4
The C4 treatment is intended for sites located more than 5 km from the coastline. The manufacturer states a nominal service life of 15 years, protected from corrosion.
For a coastal site, the data sheet of this model cites a treatment up to C5.
- > 5 km
- from the coastline
- 15 years
- of nominal service life, protected from corrosion
Scalability
Expandable up to 5.22 MWh by combining 20 units. CESC manufacturer data.
A quote for the Mercury 261
Tell us what your site needs to power, where it is and on which dates: we come back to you with a costed proposal.
Have a project? Let's talk!
Our teams are here to advise you and offer the solution best suited to your needs.