Rubix R-Series RRS51280 14.34kWh 280Ah 48V LiFePO4 Battery

The Rubix R-Series RRS51280 is a 48V LiFePO4 battery delivering 14.34kWh of usable capacity per unit — nearly three times the energy of a standard 5kWh residential module — in a stackable enclosure purpose-built for large residential and commercial energy storage systems. With 200A continuous discharge output, PWM Technology start-up support, and scalability to 917.5kWh across 64 parallel units, the RRS51280 is a high-capacity solar battery storage platform for installations where fewer units, fewer connections, and more energy per footprint are the priority.

Key specifications

• Energy capacity: 14.34kWh (51.2V nominal / 280Ah); max recommended discharge to 51V (20% SOC)
• Cycle life: 3,000 cycles at 100% DOD; 4,500 at 80% DOD; up to 7,000 at 50% DOD — 80% capacity retained at end of rated life
• Scalability: up to 4 units per stack; expandable to 64 parallel batteries for 917.5kWh total system capacity
• Continuous discharge: 200A (10.24kW); PWM Technology start-up capability; 180A max continuous charge rate
• Certification: UL 1973 cells; UN 38.3 transport certified; RPSD compliant

More capacity, fewer units to wire

ESS builds based on smaller-format batteries require more units, more cabling runs, more BMS connections, and more potential failure points. The RRS51280 reduces that complexity at the source — 14.34kWh per unit means a four-battery stack reaches 57.3kWh in the same footprint that smaller formats need far more units to match. Prismatic LiFePO4 (lithium iron phosphate) cells with welded busbar connections and Impactiv balancing at 2A maintain pack consistency across up to 7,000 rated cycles at 50% depth of discharge.

Key Applications

• Large residential solar backup: A single RRS51280 covers substantial daily household consumption; a full 4-unit stack reaches 57.3kWh for extended whole-home backup capability.
• Commercial ESS: Scales to 917.5kWh across 64 parallel units for light commercial, agricultural, and microgrid storage applications.
• High-consumption off-grid properties: Provides the kind of capacity that remote properties with significant daily loads need from a manageable number of battery units.
• Solar self-consumption maximization: Stores full-day surplus from large rooftop arrays, reducing grid dependence for energy-intensive households.
• Emergency preparedness: At 14.34kWh per unit, the RRS51280 powers essential loads for days during extended outages rather than hours.

Internet monitoring and multi-layer BMS protection

• Touchscreen LCD with Internet Cell Data displays SOC, pack voltage, charge/discharge current, event log, internal temperatures, and real-time cell data via internet connection — supporting remote monitoring without additional hardware.
• PWM Technology start-up: Built-in support for inverter startup current demands reduces reliance on external soft-start equipment.
• Low voltage protection: BMS low voltage disconnect activates at 41V (±1V) to prevent deep discharge damage; inverter low battery cutout is 48V.
• Thermal cutoffs: Charging halts at 32°F (0°C); discharging halts below 0°F (-17.8°C); BMS disconnects above 135°F (57.2°C).
• Impactiv cell balancing at up to 2A — a higher balancing current than smaller Rubix modules — suited to the larger 280Ah cell configuration.
• RPSD (Rapid Shut Down) function and pressure-vented prismatic cells support residential and commercial installation compliance.

Inverter and system compatibility

The RRS51280 is designed for 48V inverter systems running a LiFePO4 charging profile: recommended absorb 56.8V (57.6V max solar only), float 54.4V, absorb done at 4% of battery capacity over a 10-minute period. PWM Technology start-up is built in for inverter initialization support. Install horizontally using the included base unit indoors only — IP50 rated, not suitable for outdoor installation. Minimum clearances: 1 in. from walls, 1 in. between parallel stacks, 6 in. between the stack top and wall-mounted solar equipment, and 4 ft. from any water source or conductor. Maximum 4 batteries per stack; up to 64 in parallel. Dual M8 stainless steel bolt-on terminals; max terminal torque 18 ft-lbs. Battery weight: 271 lbs. per unit.

Why choose the Rubix R-Series RRS51280?

The Rubix R-Series RRS51280 is the right LiFePO4 deep cycle battery when capacity per unit and installation density both matter. At 14.34kWh per module, it delivers more energy per connection point and per floor footprint than standard residential battery formats — and the 1-inch minimum wall and stack clearances allow large parallel banks to be built in tight spaces. Scalability to 917.5kWh across 64 units, Internet Cell Data monitoring built into the touchscreen, and RPSD compliance make it a well-supported choice for larger permitted residential and commercial installations.