kmkrreeves27 November 2025 Verified Purchase
Nice cabinet
The buss bars are sturdy just mind the torque values.
EG4 3-Slot Enclosed Battery Rack for Server Rack Batteries, Welded & Pre-Assembled Battery Storage
SKU: EG4ABR00V003S
Product Summary
The EG4 3-slot enclosed battery rack is a pre-assembled, welded steel cabinet that holds up to three server rack batteries in a compact, secure enclosure. Ships fully assembled with 300A busbars, protective covers, and removable casters.
Specifications:
- Holds up to 3 standard 19-inch server rack batteries
- Heavy-duty welded steel with black powder-coated finish
- Included 300A busbars with protective covers
- Lockable, vented front door for security and passive airflow
- Top and side cable routing knockouts
- Removable casters with adjustable leveling feet
- Dimensions: 23.6 x 26.8 x 26.5 in
- Weight (empty): 94 lbs
$433.99
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Current Connected is YOUR EG4 Electronics product specialist
About the EG4 3-Slot Enclosed Battery Rack
The EG4 3-slot rack is the smaller counterpart to the 6-slot enclosed battery rack, built for systems that need three or fewer batteries. At 26.5 inches tall (29.6 inches with casters), it fits under workbenches, in closets, and in tight mechanical rooms where the full-height 6-slot cabinet wouldn't work. It's the same welded steel construction, powder coat finish, and lockable design as the 6-slot, just half the height.
Busbars and Wiring
The rack includes 300A-rated heavy-duty busbars with protective covers for connecting batteries in parallel. Three EG4 48V 100Ah batteries at full discharge rate draw up to 300A combined, so the busbars are sized to the rack's capacity without headroom issues. Cable routing knockouts on the top and sides of the enclosure accommodate conduit or wire glands for clean cable management to your inverter.
When to Choose the 3-Slot Over the 6-Slot
The 3-slot makes sense for starter systems where you're beginning with one to three batteries and don't plan to exceed 15.36kWh in a single cabinet. It's also the right choice when physical space is the constraint, since it takes up roughly half the vertical space and 60 lbs less weight than the 6-slot. If you anticipate growing beyond three batteries, the 6-slot gives you room to expand without buying a second cabinet. The casters on the 3-slot are removable, so you can stack two 3-slot cabinets if your plans change.
Security and Ventilation
The front door is hinged and lockable with a keyed handle. Both front and rear panels are vented for passive airflow to keep batteries within their operating temperature range. Grounding fasteners on the floor of the cabinet connect to pre-installed grounding wires on the door and rear panel.
Installation
The rack ships fully assembled. Casters and hardware are packed inside and bolt on in a few minutes. Lower the adjustable rubber feet on each caster to stabilize the cabinet in its final position before loading batteries. One note from installer feedback: if you're using EG4 LL-S batteries with front handles, consider removing the handles before sliding the batteries in. The spacing around the busbars is tight, and the handles can get in the way during cable connections and firmware updates.
Recommended Accessories
Videos
EG4 3 Slot Rack Overview & Assembly
YouTube
Frequently Asked Questions
The 3-slot holds three batteries with 300A busbars. The 6-slot holds six batteries with 600A busbars. Everything else is the same construction, lockable door, and design. The 3-slot is about half the height (26.5 vs 46.9 inches) and 60 lbs lighter empty. Choose the 3-slot for smaller systems or tight spaces, the 6-slot if you want room to expand.
Yes. Remove the casters from the top cabinet. The flat top surfaces are designed to support stacking.
The rails accept standard 19-inch rack form factor batteries. Vertical clearance per slot is approximately 6 inches (confirm by measuring). The battery securing bolt holes are drilled for EG4 batteries, so other brands will sit on the rails but may not bolt in.
No. This is an indoor cabinet. Install it in a garage, utility closet, basement, or mechanical room. Keep it away from water and high humidity (above 55%).
The cabinet includes busbars, busbar covers, casters, battery securing bolts, and wire glands. Battery-to-busbar cables (6 AWG) come with EG4 batteries, not the rack. You supply the cables from the cabinet to your inverter.
Yes. The 300A busbar matches the combined maximum discharge of three EG4 48V 100Ah batteries at 100A each. No external busbar upgrade needed.
It's compact by design. Installer reviews note that EG4 LL-S battery handles can get in the way when making cable connections or doing firmware updates. Removing the handles before sliding the batteries in makes the process easier.
Customer Reviews
(2)4.5
Glen Nile24 November 2025
Rugged and heavier than it looks!
There is a lot to love about this rack and three EG4 batteries. The construction and assembly are both high quality. The lockable handle is a nice touch. The wheels roll easily and sturdy rubber feet drop easily to stabilize once in its final location. The batteries also slid in easily - though two-person install is recommeded! The main drawback is the spacing around the bus bars and the battery handles (with my LL-S batteries). You might consider removing the handles prior to install if you are doing so with two people. In any position, the handles get in the way of very limited space when installing the battery cables or even during RS232 and RS485 firmware updates. Lastly, while there was some cosmetic damage due to careless handling during the shipment (shocker), I was not bothered enough by it to go through the hassel of putting in a claim. This was not the fault of EG4 or Current Connected.