How to Build a 12V 100Ah LiFePO4 Battery with EVE LF100LA Cells
Nov 5, 2026 . Alobari Team
Quick answer: Connect four 3.2V EVE LF100LA 100Ah LiFePO4 cells in series (4S) to make a 12.8V 100Ah, 1.28kWh battery. You also need a 4S LiFePO4 BMS rated above your maximum current (for example 100A for a 1,000W inverter), the supplied bus bars, a main fuse, proper cables and lugs, and a sturdy enclosure. Top-balance the cells to the same voltage before connecting them.
Parts list
- 4 × EVE LF100LA 3.2V 100Ah cells (bus bars and M6 bolts included at Alobari)
- 4S LiFePO4 BMS — continuous rating above your load current; 12V × 100A ≈ 1,200W
- Main fuse or DC breaker near the positive terminal
- Battery cable (e.g. 16–25mm² for 100A) with crimped lugs
- Enclosure with compression (end plates or straps) and insulation sheets
- Multimeter; optional capacity tester or active balancer
Step-by-step
- Check each cell: measure voltage — they should be close (within ~0.05V).
- Top-balance: connect all cells in parallel and charge to 3.60–3.65V with a bench supply, or leave them in parallel for 24h so voltages equalise.
- Arrange in series: place cells in a row alternating + and −; use bus bars to join cell 1 (−) to cell 2 (+), cell 2 (−) to cell 3 (+) and cell 3 (−) to cell 4 (+); torque bolts to the datasheet value and do not over-tighten.
- Wire the BMS: balance leads first (B−, B1, B2, B3, B+) in order, then the main negative.
- Fuse and terminals: fuse on the positive output; insulate exposed metal.
- Test: confirm ~13.0–13.4V at rest, then charge with a LiFePO4 profile (14.2–14.4V) and check the BMS cuts off correctly.
Charging settings
| Setting | 12.8V LiFePO4 (4S) |
|---|---|
| Bulk/absorb | 14.2–14.4V |
| Float | 13.4–13.6V (or off) |
| Low-voltage cut-off | ~11.0–12.0V |
EPEVER TRC MPPT controllers have a LiFePO4 profile — e.g. TRC3210 or TRC4210.
Going bigger: 24V and 48V
8 cells in series (8S) give 25.6V 100Ah (2.56kWh); 16 cells (16S) give 51.2V 100Ah (5.12kWh) — the common choice for 48V solar and easy-bike conversions. Use a BMS matching the series count.
Safety
- Never short the terminals — a 100Ah cell can deliver hundreds of amps.
- Do not solder to cell terminals; use the bolts and bus bars.
- Keep the pack away from direct sun and moisture.
বাংলায় সংক্ষেপে
৪টি EVE LF100LA সেল সিরিজে লাগালে 12.8V 100Ah (১.২৮ kWh) ব্যাটারি হয়। সাথে লাগবে 4S LiFePO4 BMS, ফিউজ, মোটা তার ও বক্স। জোড়ার আগে সব সেল সমান ভোল্টেজে ব্যালেন্স করুন এবং LiFePO4 প্রোফাইলে (14.2–14.4V) চার্জ দিন।
Need help choosing?
Call or WhatsApp Alobari at +880 1611-846093 with your panel size, battery and the appliances you want to run — we will recommend the right setup. Cash on delivery and delivery to all 64 districts of Bangladesh.
