LiFePO4 Battery Pack

The LiFePO4 battery is made up of the following parts:

• Four 280Ah LiFePO4 cells ordered from china on AliBaba
• An 4S LiFePO4 1.2A active load balancer from AliExpress
• A JBD Smart BMS 12V 4S 100A
• Two 300A copper terminal posts
• Some fat cabling
• Lugs and stuff
• A plywood box

I opted to purchase the cells on Alibaba because it provides better control over both the product and the supplier. This platform allows for direct communication, facilitating personalized prices, access to datasheets, and more. It offers a significantly enhanced shopping experience compared to AliExpress.

With numerous resources available on the web and YouTube, I won't delve into the process here. I can only express that it was a highly enjoyable experience, and I am exceptionally content with the results.

The only challenges I encountered revolved around determining the optimal positioning of the box and cells to ensure a proper fit within the battery compartment of my RV.

Photos

Planning

Measuring the available space:

Simulation:

Collecting hardware

Active balancer in 3d-printed box:

Manufacturing custom bus bars:

Building the battery box:

The cells has arrived from china:

Initial tests

Charging and balancing the cells:

Testing BMS and BlueTooth:

Load tests:

Checking the BMS status with an app:

Testing the heat film that is going to heat the battery in the winter:

Assembly

Securing:

Wohoo:

Preparing the busbar mounts and cabling:

Install in RV

Preparing to install:

It's in place:

Charging from solar: