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Fogstar Energy 15kWh 48V Rack Battery Bundle

Save 10%
Original price £4,448.97
Current price £3,999.99


Pre-order for your Server Rack Battery can be secured with just a 10% deposit. The remaining balance will be requested when your battery is ready to ship.

Our consignment of Fogstar Energy Rack Bundles is due to arrive 8th December, please allow up to 10 days for your order to ship as these will require a palleted delivery.

Discount codes cannot be redeemed against these products.

Our UK-designed Fogstar Energy SR51.2V Server Rack Batteries comes complete with heating, several pre-loaded inverter protocols, TFT LCD touch screen, 16 Grade A EVE Cells, a DC Rated Breaker and an 8 year warranty.

This 15kWh bundle comes complete with three (3) SR51.2V Server Rack Batteries and one (1) Fogstar ESR51.2V Energy Storage Cabinet either in a three (3) or six (6) battery capacity. If you opt for the 6 battery capacity, this allows you to build your energy storage out over time by adding further rack batteries.

Our racks are built for the UK Climate. They heat themselves when a temperature of <5°c is detected, enabling the user to charge our racks in temperatures of -20C.

The BMS have several pre-loaded inverter protocols with out of the box support for Victron, Pylontech, Growatt, Solis, Sofar and Goodwe. It is crucial to note however, that inverter integration is not required for our server rack batteries to function.

We're so confident about the design, build and components that have gone into making our Fogstar Energy Racks that they all come with an 8 year warranty. As with all Fogstar products, you can expect a superior design quality with a lifecycle of around 10-15 years.

The Fogstar Energy Racks include a 4.3 inch TFT LCD, full colour touchscreen. The screen auto-sleep function ensures the unit retains precious energy when not in use, and when powered on, provides accurate and detailed information into the system status - we have hyperdrive Captain!

We use 16 premium 100Ah Grade A EVE cells in our unit (in comparison to the 15 cells used by other leading manufacturers). Our Grade A EVE cells draw an industry leading 4000 Cycles @ 80% Depth of Discharge (DOD). 

Up to 16 racks can be connected in parallel, however you cannot connect the Fogstar Energy SR51.2V Server Rack Battery in series.

Our Fogstar Energy Racks are fitted with a 125Amp DC Breaker, offering a secure protective feature should any faults occur. The DC Breaker interrupts the power flow, shutting off the electrical current if a critical issue is detected.

We've used the Gold Standard PACE BMS in our Rack batteries, want to know why? Read our blog to find out.

  • Manufacturer: Fogstar Energy
  • Model: ESR51.2V 5.12KWH
  • EVE Cell Model: LF100LA
  • Cell Assembly: 16S1P
  • Cycle Life: 4000 Cycles at 1C to 80%. (After 4000 cycles, you will still have a battery that can deliver 80% of the stated capacity) 5.12Kwh is fully useable.
  • BMS: PACE 100A BMS
  • Maximum Discharge: 100A per unit (300A for a 15kWh system)
  • Balance Current: 0.5A
  • Capacity: 100Ah
  • Weight: 45.2kg
  • Nominal Voltage: 51.2V
  • Rack Unit Size: 3.5U
  • Size: 155mm x 450mm x 440mm
  • Pre-loaded Inverter Protocols: Victron, Sofar, Pylontech, Growatt, Solis, Goodwe.


  • Fogstar ESR51.2V 5.12KWH Rack Battery (x3)
  • Fogstar ESR51.2V Battery Rack Cabinet (x1)
  • PC communication cable RS232 to USB (x1)
  • Battery to Battery (B2B) communication cable (RS485 to RS485) (x3)
  • Positive 'dual' 8AWG cables (x6)
  • Negative 'dual' 8AWG cables (x6)
  • M6 threaded screws, bolts and washers for securing Racks to Cabinets (x18)