Rack Mount BMS Master Slave BMS High Voltage BMS 144S460.8V 250A BS for LiFePO4 ESS UPS Battery Storage System

4U rack-level high-voltage BMS supporting 15-rack parallel operation, engineered for UPS cabinets and commercial & industrial energy storage systems.

This is a rack-level controller, not a module-level board. GCE's 4U high-voltage RBMS governs an entire 144-cell LFP string at 460.8V nominal, acting as the middle tier of a BMU-RBMS-SBMS chain and allowing as many as fifteen such strings to feed one cluster controller without competing for current share.

The whole assembly fits a standard 19-inch frame at 482 × 180 × 500 mm and roughly 22 kg, with studs and cable entry on the front face. A pre-charge stage sits inside, together with a breaker able to clear 1000 V at 25 kA inside 20 ms, so trouble on one rack is dealt with locally rather than pushed onto the DC bus.

Two supply inputs, one tapped from the cells and one from site mains with mains taking precedence, keep the controller alive for logging and signalling even after the string itself is isolated. Thresholds are written during commissioning and locked afterwards. Around five thousand events remain in onboard storage, and an SD slot extends history down to individual cell level.

Signal routes are kept apart on purpose: CAN downward to the BMU boards, RS485 or CAN upward to the cluster layer, Ethernet to the monitoring host, RS485/CAN to the converter. Where another maker's PCS, inverter or UPS is already on site, the protocol layer is tailored per project instead of bolting on a gateway.

Voltage tier matters here. A 144S string belongs in the 750 V class, usable from 260 to 750 VDC, topping out at 525.6 V when each cell reaches 3.65 V and bottoming near 360 V at cut-off.

• One controller per 144-cell string rather than one per module, so fewer nodes and shorter harness runs
• Current sharing across paralleled strings is handled automatically, and grid-tie to off-grid transfer needs no operator action
• Fifteen racks accepted under a single SBMS as standard practice
• Headroom to 256 cells in series, or 400 where the bank is lead-carbon
• 125 A, 160 A or 250 A chosen at order
• Firmware refreshed over IAP; protection limits editable before lock
• Volt-free contacts to inhibit charge and discharge, two channels available
• Optional mid-line three-wire topology and insulation supervision from 300 VDC upward
• Remote display in 4.3-inch or 7-inch size; housing in RAL 9005 black with sand texture

Utility PV blocks, islanded grids, factory and commercial storage rooms, microgrids, UPS cabinets, and 220 or 240 V DC plant supply — wherever a 144-cell string needs its own brain before the site controller steps in.

Brand: GCE, built in China. One set minimum. Quotations through bruceliu@hngce.com. Packed in carton, bundle, pallet or wooden crate. Ready in 15 to 20 days. FOB, CFR, or EXW. Capacity: 1000 units monthly. Rating, display size, three-wire midline build, third-party converter protocols, and the companion cluster controller are all selectable.

Commissioning walk-through, threshold setting, protocol mapping, fault diagnosis, firmware updates, and handover training for integration teams.