Skip to content

SEPLOS Mason 280L and x16 Grade B Envision 280Ah Battery Bundle

£1,539.83

This Seplos Mason 280L battery bundle provides everything you need to create a DIY 48V 14.3kWh battery system, but with a more cost-effective cell option.

What's Included:

  • SEPLOS Mason 280L (vertical) kit
  • 16 Grade B Envision 280Ah Lithium Iron Phosphate (LiFePO4) cells
  • SEPLOS Grade B Busbars
  • V3 Seplos BMS

Ideal for DIY Home Energy and Solar Storage:

This DIY kit offers a modular design, allowing you to parallel additional units for increased capacity.

Communication and Compatibility:

The included Seplos BMS (with Bluetooth) facilitates communication with various inverters via CAN & RS485 protocols, including Victron, Growatt, Sofar, Solis, and more (refer to the manufacturer's website for a complete inverter compatibility list).

Envision Grade B Cells:

This upgraded bundle utilises Grade B Envision cells, offering a balance between performance and affordability. While they may have slight cosmetic imperfections, they still deliver reliable energy storage.

  • Exceptional lifespan: Delivers at least 6,000 cycles when used at a depth of discharge (DOD) of 80%. 
  • Safe and efficient: Operates within a 0.5C charge and discharge rate, with a voltage range of 2.5V to 3.65V.

Envision Cell Specifications:

  • Manufacturer: Envision
  • Capacity: 280Ah
  • Size: 72mm x 200mm x 172.5mm 
  • Weight: Approximately 5.35KG
  • Maximum Discharge: 280A (1C)
  • Nominal Voltage: 3.2V
  • Cycle Life: 6,000 cycles at 80% DOD.


16 * Grade B Envision 280 Cells
1 * Battery Case (Bottom case, Top Bracket, Top cover)​
1 * 48V 200A 16S Seplos V3 BMS
1 * 58V 400A Fuse
4 * Handle
2 * PCB Board for BMS and Cell Connection
3 * Upper and Lower Latch lock
1 * LCD Screen
1 * LCD Screen Sticker
4 * Button Cap
3 * Wires (LCD Screen wire, PCB board A and PCB board Connector)
2 * Battery Terminals (P+ Terminal and P- Terminal)

Other components included:

6 * Copper bus bars (BMS connection)
15 * Aluminium bus bars (cell connection)
10 * Epoxy sheet (between cell and the case)
26 * EVA Tape (between cells)
1 * PC sheet (top cover)

Screw details:

12 * Phillip Hex M4 * 8mm (PCB board fix)
9 * Phillip Hex M5 * 8mm + Washer + Spring Set (ground cable and top bracket fix)
7 * Phillip Hex M6 * 25mm + Washer + Spring Set (front Panel fix)
10 * Phillip Round M3 * 8mm + Washer + Spring Set (BMS and LCD Screen fix)
12 * Phillip Pan M5 * 10mm (latch fix)
16 * Hexagon Socket Pan M4 * 10mm (P+/P- Terminals fix)
42 * Hexagon Socket Countersunk M4 * 10mm (Handle and battery case)
4 * Phillip Hex M6 * 14mm + Washer + Spring Set (foot fix)
5 * Phillip Hex M8 * 10mm + Washer + Spring Set (P+/P- Bus bar fix)
8 * Phillip Round M5 * 10mm + Washer


What is not included in this kit that you will need:

Inverter Connection Cables
CAN or RS485 Communication Cables (often supplied with inverter)
Seplos RJ45 to USB Cable (to connect to PC for BMS software).