TOBOR logoGreen Energy Solutions
PortalTalk to us
C&I storage · MW-scale

Grid-charged MW-scale BESS

1.25 MW / 5 MWh · 440 V three-phase

A modular 5 MWh LFP battery behind ten paralleled 125 kW bidirectional PCS modules (1.25 MW). TOBOR EMS schedules grid charging and discharging through the same PCS path, and on grid failure the isolated 440 V load bus is supplied from the battery through a 400 / 440 V voltage-matching interface.

Request this design for my siteView the diagram
Power
1.25 MW
Energy
5 MWh
Duration
~4 h ideal
Interface
440 V · 3-phase
System power flow

How the energy moves.

Conceptual single-line diagram · grid charging / grid discharging | TOBOR EMS | 1.25 MW / 5 MWh | 440 V three-phase

Grid import / grid dischargeBidirectional BESS charge / dischargeAC power circuits: three-phase; PE to equipmentGRID CONNECTION440 V, three-phase, 50 HzGrid charging / dischargingBidirectional power flowMAIN INCOMER / ISOLATIONMeter + AC protectionClosed: grid availableOpen: islanded / no backfeedPROTECTED AC BUS440 V LOAD SUPPLYThree-phase, 50 Hz1.25 MW design loadProtected load feedersTOBOR EMS manages grid charging and discharging through the same PCS path.On grid failure, the isolated load bus receives battery backup.BATTERY BANK · 5 MWh314 Ah LFP cellsBMS + DC fuse / isolationContactors and pre-chargeString design matched to PCSBIDIRECTIONAL PCS ARRAY125 kW modules · 10-unit basis1.25 MW aggregate nominalAC → DC: grid chargingDC → AC: grid / backup discharge400 / 440 V INTERFACEBidirectional matching transformer400 V PCS side ↔ 440 V load busAC breakers and protectionLoad breakerDC + / −400 V AC440 V AC / PCS feeder

Scroll the diagram sideways →

Concept only. Single lines represent power circuits. Final conductor sizes, protective-device ratings, transformer capacity, neutral / earthing arrangement and transfer sequence require engineering approval. Net 1.25 MW output and four-hour backup must account for losses, reserves and site conditions.

Grid charging / discharging

  • Charge: grid → AC bus → interface → PCS → battery.
  • Discharge: battery → PCS → interface → AC bus → grid / loads.
  • TOBOR EMS sets charge, discharge and export limits.

Grid unavailable

  • Grid isolation opens; the utility is disconnected.
  • Battery → PCS → voltage-matching interface → load bus.
  • BESS supplies the 440 V three-phase loads.
Design basis

Technical specification.

Power conversion

  • PCS10 × 125 kW bidirectional modules in parallel
  • Aggregate PCS1,250 kW nominal at unity PF
  • System interface440 V L-L · 3-phase · 50 Hz
  • Voltage matchingBidirectional 400 / 440 V transformer

Battery

  • Nominal energy5 MWh (5,000 kWh)
  • CellLFP · 3.2 V · 314 Ah
  • Cycle life7,000–8,000 cycles*
  • Indicative backup5,000 kWh / 1,250 kW = 4 h ideal

Scope & protection

  • BatteryRacks / enclosure with BMS · thermal management
  • SafetyFire detection / protection
  • SwitchgearAC/DC switchgear · grid isolation · energy metering
  • ControlTOBOR EMS · grid charge / discharge · export limit

Design-basis values from a TOBOR project offer. *Cycle life depends on cell OEM specification, depth of discharge, temperature, C-rate and end-of-life criterion. Final ratings, certifications and performance guarantees follow the approved project-specific design.

Best for
  • Industrial plants on 440 V buses wanting backup and peak management
  • Time-of-day tariff shifting with export-limited discharge
  • Replacing large DG sets on critical process loads
  • Solar developers and EPCs packaging storage for C&I clients
Built from
Other designs

More project solutions.

EV charging + BESS · all-in-one
EV charger with built-in BESS

120 kWh · 30 kW grid input · 60 kW shared output

EV charging hub + BESS
BESS-backed EV charging hub

125 kW / 250 kWh BESS + 2 × 60 kW DC chargers

Want this design at your site?

Tell us your vehicles, loads and grid connection. Our engineers adapt the design and send a single-line diagram with the offer.

Request this design