What You Need
Battery Cells
You will need a minimum of 4 Lifepo4 cells to make one 12v battery.
If you buy 4 X 100Ah cells you can make a 12v 100Ah battery.
Should you want to increase voltages and amp hours you will need a minimum of 8 cells.
It is good practice to use a battery shunt/monitor which are listed here.
Battery Management System (BMS)
Choose a suitable BMS for your battery pack.
This device keeps your batteries in good health.
For a 4 cell 12v 100Ah battery you will require a 12v 100 Amp 4s BMS.
If it's 8 cells for 12v then you will need an 12v 8s BMS and so on.
If you have 8 cells, you can make a 24v battery!
I bought mine from Daly on AliExpress but they are also available on Amazon & Ebay.
Busbars
Cells are usually shipped with busbars, but double check! If not you will have to fabricate your own or buy them. These are used to join the cells together.
Essential Tools
You will need ring terminals, battery terminals and suitable crimping and wire cutting tools as listed below. You may also need a good soldering iron. Check out this page!
Wiring & Fuses
Your going to need electrical wires of a suitable size / gauge that's rated for the battery voltage and amp ratings for your battery and don't forget fuses. You can get "PURE" copper cable kits here, do not buy cheap cables! Cheap cables are mostly aluminium and not pure copper.
Do Lots of research
Do as much research as you can on the topic of DIY lifepo4 battery builds. You will need to be 100% confident in what you are doing! Be sure to check the useful downloads link!
Add These To Your Shopping List
Lifepo4 Cells
These affiliate links will take you to suppliers on AliExpress who have good feedback.
1000W Pure Sine Wave Inverter
This 12v pure sine wave power inverter is a powerful, economical and reliable unit used for backup power, RVs, boats, trucks and for most other off grid applications. Simply wire the power inverter to a battery and then connect it to the electrical appliances you want to use.
Mega Fuses
Add a Fuse From Battery Positive wire to inverter. This fuse should be placed as close as possible to the battery. You will need to cut the main wire, add some terminals and your all set. Size the fuse to the wattage of the inverter. Example a 12v 3500w inverter will need a 350a fuse. (3500 / 12v = 291 X 1.25% = 295 rounded up) to 350 Amps
Fuse Block
If you are planning on running 12v lights etc you will need a Fuse Block. You can also fuse the solar charge controller using a 30A fuse to this block.
Battery Monitor
Although it is not required, it is useful to have an idea of what power your system has. This battery monitor will show you capacity available etc
Adjustable Wire Stripper Kit
Make life easier with this 3 in 1 Multifunction Crimp Tool Kit This toolset comes with a multifunction stripper tool and 400pcs Insulated and Non-Insulated wire terminals. Adjustable ferrule Crimping pliers can strip insulation and non-insulating materials, press lines, cut lines, strip lines, and flat workpieces. The wire crimping tool makes your work of terminals and connectors safer
Good Crimping Tool Set
Bullet crimper is suitable for crimping pre-insulated terminals as follows:Red 0.5 mm² - 1.5mm² /AWG 22-16,Blue 1.5 mm² - 2.5 mm² /AWG 16-14,Yellow 4 mm² - 6 mm²/AWG 12-10
10 Amp Power Supply Unit
The DC power supply is a professional power regulation device that designed with crystal clear, backlit 4-digit LED display of voltage, current, and power. Precise accuracy: 00.01V and 0.01A. You can easily tune it within 0-30V and 0-10A
Battery Voltage Meter
Voltage Measuring range: DC 5 - 48V
Measure accuracy: 1% (± 1 digit)
Material: Flame retardant PC
Display method： LED Digital display
Display color : Blue
Suitable for Lead Acid Batteries
Battery Box USB & 12v Outlet
This Bison battery power box is a unique 12 volt power station that quickly, easily and safely stores and distributes power from a 12 volt marine battery directly to your appliance