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Meta Description: Build a 32kWh 48V LiFePO4 powerwall in one afternoon with the EVE 628Ah 16‑cell kit and pre‑assembled horizontal enclosure. Includes JK BMS, DC air switch, active balancing, and integrated compression. EU stock, fast shipping. Perfect for whole‑home backup, off‑grid, and commercial storage.

Introduction: One Kit, One String, 32 kWh

For years, building a 30 kWh lifepo4 battery bank meant assembling two parallel strings of 16 cells each — 32 cells, twice the busbars, twice the balance leads, and twice the potential failure points. The EVE 628Ah 16‑Cell DIY Kit paired with our 48V Horizontal Battery Box changes that entirely. This all‑in‑one bundle delivers everything you need to assemble a single‑string 51.2V / 32.15 kWh powerwall that is simpler, cleaner, and more reliable than any dual‑string 314Ah build.

The kit includes 16 matched Grade A EVE 628Ah cells — each storing over 2,000 watt‑hours — and a pre‑engineered horizontal enclosure that arrives with a pre‑wired JK BMS (200A/300A), an integrated DC air switch, compression plates, and a 4.3″ LCD touchscreen. You don’t need to fabricate anything. Just drop the cells in, tighten the busbars, and you have a professional‑grade home battery backup or off‑grid energy system that fits neatly on a shelf, under a workbench, or in a rack — all shipped from local EU stock.

If you’re ready to go big without adding complexity, this kit is the most direct path to a 32 kWh powerwall in 2026.

What’s Inside the EVE 628Ah 16‑Cell DIY Kit

Everything arrives in one shipment from our European warehouse. Here’s exactly what you get when you order the EVE 628Ah 16‑Cell Kit with Horizontal Box :

16 x Grade A EVE 628Ah LiFePO4 Cells
Each cell is brand‑new, factory‑matched for voltage, capacity, and internal resistance. Every unit comes with its original QR code and a detailed test report so you can verify authenticity before you start building. Typical tested capacity exceeds 640Ah.

Pre‑Wired JK BMS (200A or 300A)
The legendary JK BMS is already mounted inside the enclosure, with RS485 and CAN communication ports routed to external connectors. Its 2A active balancing continuously transfers energy between cells, keeping your 16 large‑capacity cells within 5–10 mV indefinitely. Closed‑loop communication works out of the box with Victron, Growatt, Deye, Sofar, and Voltronic inverters.

Integrated DC Air Switch (MCCB)
A genuine moulded‑case circuit breaker, pre‑installed on the front panel, provides a single‑action, lockable disconnect directly at the battery. This satisfies the requirements of most residential electrical codes and marine/off‑grid inspections.

4.3″ Touchscreen LCD
Pre‑connected to the BMS, the screen displays individual cell voltages, total pack voltage, state of charge (SOC), temperature, and alarm status in real time.

Heavy‑Duty Copper Busbars & Hardware
Flexible, nickel‑plated copper laminates with laser‑etched polarity markings. All stainless steel M6 bolts, washers, and lock washers are included.

Reinforced Horizontal Enclosure with Compression System
The steel case is specifically designed for the thicker EVE 628Ah cells (approx. 135mm thickness). Heavy‑gauge end‑plates and four 8mm threaded rods deliver uniform pressure across the entire stack, meeting the 600–800 kgf requirement that large‑format prismatic cells need to achieve their full 8,000‑cycle lifespan.

Pre‑Loomed 16S Balance Harness & EVA Foam Separators
Colour‑coded sense wires reach every terminal in the correct sequence. One plug connects the entire harness to the JK BMS. Thick foam separators and epoxy sheets provide electrical isolation and vibration damping.

Why the 628Ah Kit Beats Building with Smaller Cells

1. One String, Zero Parallel Complexity
A 32 kWh bank built with 314Ah cells requires two BMS units, 32 cells, and dozens of extra busbar connections. With the EVE 628Ah kit , you build the exact same capacity with a single 16S string — one BMS, one set of connections, one compression frame. Fewer components mean fewer points of failure and a significantly cleaner installation.

2. Active Balancing That Scales
The included JK BMS pumps 2A of balancing current between cells. On 628Ah cells, a 10mV drift represents several amp‑hours of imbalance. The active balancer eliminates this drift continuously, preserving every watt‑hour of your 32 kWh investment. Passive balancing simply cannot keep up at this scale.

3. Engineered Compression for Thicker Cells
The 628Ah cell is roughly twice as thick as a 314Ah cell. A generic DIY compression rig won’t cut it. This horizontal enclosure uses thicker steel plates and 8mm rods specifically rated for the higher force required, ensuring uniform pressure across the larger cell face. This directly translates to maximum cycle life.

4. EU Stock, Ready to Ship
The complete kit — cells and enclosure — sits in our European warehouse. You receive everything in one delivery, with a transit time of 5–10 working days across the EU. No separate orders, no waiting for a container from overseas.

5. Grade A Cells with Full Traceability
Every cell in the kit is individually tested and matched. Scan the QR code on any cell to verify its capacity, internal resistance, and production date. No rewrapped, no B‑grade — just genuine EVE 628Ah automotive‑grade cells.

628Ah vs 314Ah: Which Kit Is Right for You?

For systems above 25 kWh, the 628Ah kit is the clear winner in simplicity, reliability, and total cost of ownership.

Technical Specifications of the Assembled 32 kWh Battery

Step‑by‑Step Build Overview: From Pallet to Powered‑Up

1. Inspect and Verify All 16 Cells
Lay out the cells. Confirm each reads 3.29–3.30V and the entire batch is within 0.02V. Scan each QR code using our online verification tool . Clean terminals with isopropyl alcohol.

2. Load the Horizontal Enclosure
Place cells into the foam separators following the polarity diagram. The top‑opening design lets you lower each cell into position easily. Insert the heavy‑duty compression plates at each end, thread the 8mm rods through, and tighten gradually in a cross‑pattern until the foam is compressed but not crushed. This delivers the required 600–800 kgf of uniform pressure.

3. Connect Busbars and BMS Harness
Position the flexible copper busbars to create the series string (positive to negative). Torque every M6 bolt to 4–6 Nm. Attach the pre‑labelled balance leads in the numbered sequence, then plug the main harness connector into the JK BMS.

4. Top Balance (Strongly Recommended)
With 628Ah cells, a precise initial top balance is critical. Connect all 16 cells in parallel and charge to 3.65V with a bench power supply until current drops to near zero. This ensures every cell begins at 100% SOC. The JK’s active balancer will then maintain this harmony for years.

5. Power Up and Configure
Close the lid, secure all fasteners, and flip the DC air switch to ON. Using the touchscreen or the JK BMS smartphone app, set:

• Absorption voltage: 55.2V (3.45V per cell)

• Float voltage: 53.6V (3.35V per cell)

• Low‑voltage cutoff: 48.0V (3.00V per cell)

• Low‑temperature charge cutoff: 0°C

Connect your main DC cables to the inverter. Your 32.15 kWh powerwall is live.

Real‑World Feedback

“I needed 30 kWh for my off‑grid house but didn’t want the headache of two separate battery strings. The 628Ah kit with the horizontal box let me build a single 32 kWh pack in one afternoon. The JK BMS keeps all 16 cells within 0.005V. It’s been powering my entire home for six months without a single issue.” — Henrik S., Sweden

“We installed two of these 628Ah kits in our dive centre’s equipment room. The horizontal form factor let us stack them under a workbench. The air switch on the front gives our insurance inspector confidence, and the active balancing means zero maintenance. Outstanding value compared to commercial 48V racks.” — Marco L., Italy

“I upgraded from a 314Ah dual‑string setup to a single 628Ah string. Half the wiring, no more balancing between two BMS units, and the pack runs noticeably cooler under load. The integrated compression system on this box is leagues ahead of my old DIY plywood rig.” — Thomas R., Germany

Best Applications

• Whole‑Home Backup: 32 kWh powers a full household — including heat pump, well pump, and modern kitchen — through a multi‑day outage. Stack two kits for 64 kWh.

• Off‑Grid Homesteads & Farms: One kit covers the daily energy needs of a family with 6–8 kW of solar PV. No generator required on most days.

• Small Commercial & Shop Backup: Keep servers, refrigeration, and point‑of‑sale systems online during grid failures.

• Marine & Heavy RV: For large vessels or luxury motorhomes, one horizontal box provides unmatched autonomy in a space‑efficient package.

Important Considerations Before You Order

• Weight and Placement: The assembled kit weighs approximately 200 kg. Ensure your floor or shelf can support this load. Plan for a permanent installation location.

• Inverter Compatibility: The kit outputs 51.2V nominal (16S LiFePO₄). Confirm your inverter supports this configuration. All modern 48V hybrid inverters from Victron, Growatt, EG4, Deye, Sofar, and Sol‑Ark are compatible.

• Cold Weather Charging: Program the JK BMS to block charging below 0°C if the battery will be located in an unheated space.

• Professional Installation: While the kit is designed for DIY assembly, final connection to your home’s electrical system may require a licensed electrician, depending on local codes.

Conclusion: The Simplest Path to a 32 kWh Powerwall

The DIY Case Kit + EVE 628Ah (16‑Cell) Bundle is the ultimate solution for builders who need 30+ kWh of storage without the complexity of parallel strings. You get a complete, pre‑engineered system — genuine Grade A cells, active balancing, integrated safety disconnect, and a compression system designed specifically for these thicker cells — all in one box, from one supplier, with EU stock that ships immediately.

Whether you’re backing up your entire home, taking a business off‑grid, or building a commercial storage cabinet, this kit delivers the energy, simplicity, and reliability that the DIY community has been asking for.

Ready to build your 32 kWh powerwall? Order the EVE 628Ah 16‑Cell DIY Kit with Horizontal Enclosure today. Need more capacity? Add a second kit for 64 kWh. Visit our EVE 628Ah cell page for individual cell purchases or pallet pricing.