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Fogstar Energy 12V DIY Kit (Envision Grade B 315Ah)

Fogstar Energy 12V DIY Kit (Envision Grade B 315Ah)

by Fogstar
Sold out
£429.96 - £429.96
£429.96
£429.96 - £429.96
£429.96

Build your own powerful and reliable energy storage solution with our complete 12V DIY kit. Ideal for campervans, caravans, boats, off-grid, and back-up power scenarios.

Key Features:

  • Comprehensive Kit: Includes everything needed to assemble a 12V Fogstar battery, including the case, LiFePO4 cells, accessories, and BMS.
  • Capacity: Grade B Envision 315Ah.
  • Smart BMS: The included JK 200A Smart BMS with 2A Active Balancing and Bluetooth ensures optimal battery performance and safety.
  • Durable Construction: The metal case with recessed terminals and ON/OFF switch provides a rugged and reliable housing for your battery.
  • Warranty: Backed by a one-year warranty on all components, including cells, BMS, and case.
  • Optional touchscreen available - interchange your ON/OFF button for a JK BMS LCD Touchscreen Display (4.3").

Kit Specifications:

  • Voltage: 12V
  • Capacity: Envision Grade B 315Ah
  • BMS: JK 200A Smart BMS with 2A Active Balancing and Bluetooth
  • Case Material: Metal
  • Case Dimensions: L 400 x W 220 x H 265 mm
  • kWh: 4032kWh

Cell Specifications:

  • Manufacturer: Envision
  • Model: HC-L315A 3.2V 315Ah
  • Size: 71mm x 207mm x 174mm
  • Capacity: 315Ah
  • Weight: 5.6KG
  • Standard Charge Voltage: 3.65V
  • Maximum Discharge Power: 1P
  • Nominal Voltage: 3.2V
  • Cycle Life : 8000 cycles @ 0.5C

BMS Specifications:

  • Model: 200A
  • Balance Current: 2A
  • Pack Structure: 4S-8S
  • Nominal Voltage Per Cell: 3.2v
  • Operating Temperature: -30°C~75°C
  • P- / C-Connection Type: M6 Threaded Terminal - 2 each (4 total).

We recommend that users have a solid understanding of electrical systems and components before attempting to build their own battery.


Your Cells Require Top-Balancing

Top balancing makes sure all your battery cells are at the same voltage before you build your pack. This helps them discharge evenly and prevents your battery from shutting down too soon.

How to Top Balance
  1. Connect the Cells in Parallel – Link all cells positive to positive, negative to negative to equalise their voltage.
  2. Charge Slowly to 3.65V – Use a constant voltage power supply with a low current (≤10A). 
  3. Hold at 3.65V Until Current Drops Below 1A – Keep charging until the current naturally drops. This means all cells are fully charged and balanced.
  4. Disconnect and Assemble Your Pack – Once balanced, disconnect the cells and build your battery. Avoid long-term storage at full charge.

More Information:

Supporting documents are available upon request (UN38.3, Specification Reports & MSDS) - contact our Customer Service team for more information.

  • 1 year warranty on all 12V DIY Kits. Fogstar will verify your purchase prior to processing any warranty claims or returns.
  • If it is determined that the product is faulty, we will ship a new product to you immediately, you will only be asked to cover the cost of the shipping. 
  • Our warranty does not cover items that have been damaged due to gross negligence, normal wear and tear, damage due to accident or collision, abuse or incorrect installation.
  • Keep away from animals and children.
  • The Envision 315Ah Prismatic batteries usually have a cycle life >8000 cycles before noticeable capacity drop off. Batteries should be recycled at this time.
  • Do not crush, incinerate or modify.
  • Only use within manufacturers specification.