What if you don't need to build your entire home energy storage system at once?
This is the story of a customer in France who did exactly that — building and expanding his own LiFePO4 battery system step by step, over the course of a year.
A Real DIY Home Energy Storage Project 🇫🇷
We're sharing this project not because it's the largest system we've seen, or because it's a polished showroom installation.
We're sharing it because it's real — a genuine DIY home energy storage build, expanded incrementally by a homeowner who wanted to understand and control his own energy system.
Client Name: Thomas ****
Age: 45 years old
Location:Châteaurenard 13160, France
Family: Married, living in a family home
Occupation: Technical Management / Self-employed
Personality: Practical, rational and technically minded. He enjoys DIY projects, likes understanding how things work, and prefers to solve problems hands-on rather than simply relying on ready-made solutions.
March: The Project Begins with 3 Battery Systems
The customer started his build in March with Deye inverter --Deye SUN-12K-SG04LP3-EU :
- 3 × SEPLOS V4 DIY battery kits
- 48 × EVE 314Ah LiFePO4 cells
- A Deye inverter for system integration
He assembled, installed, and tested the three battery packs himself — no professional installation team, no contractor. Just a homeowner with the right kit and the motivation to build his own energy storage system.
The SEPLOS V4 DIY kit is designed for exactly this kind of project: a modular, expandable 48V LiFePO4 battery system that experienced DIYers can build and commission at home.
June: Growing from 3 to 4
After running the system for a few months, the customer decided he wanted more storage capacity.
So he added a fourth SEPLOS V4 battery system.
No major rewiring. No system overhaul. Just one more battery added when he felt he needed it.
This is one of the key advantages of a modular DIY battery system — you can expand your capacity as your needs grow, rather than over-investing upfront.
November: A Fifth System Planned
The project is still evolving. The customer is currently planning to add a fifth battery system in November.
The full timeline looks like this:
- March 2026 — 3 × SEPLOS V4 systems installed
- June 2026 — Expanded to 4 systems
- November 2026 — 5th system planned
What This Project Tells Us About DIY Energy Storage
The equipment in this build — SEPLOS V4, EVE 314Ah cells, Deye inverter — is well-proven in the DIY energy storage community. But the most interesting part of this project isn't the hardware.
It's the approach.
You don't have to build your entire energy storage system at once.
Many DIYers feel pressure to size their system perfectly from day one. But this project shows a different path: start with what you need, live with the system, learn from real-world performance, and expand when the time is right.
It's a lower-risk, lower-cost entry point — and it's exactly what modular DIY battery kits like the SEPLOS V4 are designed to support.
System Specifications
- Battery kit: SEPLOS V4 DIY (48V LiFePO4)
- Cells: EVE 314Ah LiFePO4
- Inverter: Deye
- Location: France 🇫🇷
- Installation: Owner-built, self-commissioned
Build Your Own Home Energy Storage System
If you're considering a DIY home battery project, the SEPLOS V4 kit is a strong starting point — whether you're planning one battery or five.
We'll be following this customer's project as it continues to grow. Sometimes the best energy storage stories aren't built in a factory or a showroom. They're built at home, one step at a time.
Thanks to our French customer for allowing us to share photos and details from his DIY project.
