14kWh Whole Home Backup: Rubix 48V LiFePO4 Battery + 15kW Sol-Ark Hybrid Inverter. ESS kit.

 This kit includes the primary components listed below. Additional wiring, mounting hardware, or balance-of-system equipment may be required depending on your installation requirements. Contact our team for a personalized equipment review and custom add-on pricing.

The 14kWh Whole Home Backup: Rubix 48V LiFePO4 Battery Sol-Ark 15K-2P Hybrid Inverter ESS Kit is a pre-matched solar battery backup system that pairs 14.336kWh of LiFePO4 storage with a 15,000W hybrid inverter — both confirmed compatible on voltage, charging current, and communication protocol so you can skip the component-vetting process entirely. Available through A1 SolarStore, it's sized for residential solar battery backup, off-grid cabins, and small commercial applications that need reliable, scalable energy storage without the compatibility risk of self-sourcing.

What's included

• Rubix RRS51280 R Series Battery — 1× 51.2V / 280Ah (14.336kWh) LiFePO4 deep cycle battery module
• Sol-Ark 15K-2P Hybrid Inverter — 1× 15,000W continuous / 30,000VA peak, 120/240Vac split-phase
• Rubix R Series Base & Lid — 1× structural housing set for horizontal installation and future stack expansion

Component specifications

One purchase, zero compatibility risk

Pairing a 48V LiFePO4 battery with a hybrid inverter requires matching voltage range, max charging current, BMS communication protocol, and cutoff thresholds — and getting any one of those wrong means returns, delays, or underperformance. This solar battery storage system bundles the RRS51280 and 15K-2P as a pre-engineered pair: the inverter's 48V battery port and 275A battery charge/discharge current aligns with the Rubix battery's 180A recommended / 200A max charge rating, and the Sol-Ark's CANBus & RS485 MODBUS interface pairs with the Rubix's built-in inverter communication selection — no workarounds needed.

Who this kit fits

• Residential home backup — 14.336kWh covers lights, refrigeration, and essential appliances through a utility outage, delivered as clean 120Vac single-phase power.
• Off-grid cabin or workshop — pair with a PV array up to 19,500Wto run tools, lighting, and small HVAC loads independently of the grid.
• Whole house battery backup with solar — a starting point for homeowners who want to add storage to an existing PV system and scale capacity as energy needs grow.
• Small commercial or agricultural facility — reliable solar power backup for security systems, refrigeration, or critical equipment with a clear expansion path to 917.5kWh.
• Lead-acid replacements — buyers upgrading an aging 48V bank who want LiFePO4 longevity (4,500 cycles) without sourcing a matched inverter separately.

How the components work together

The Rubix RRS51280 connects to the Sol-Ark inverter's 48V battery terminals via M8 bolt-on lugs (torqued to 18 ft-lbs). The inverter charges the battery through its MPPT solar input — accepting up to 19,500W of PV at up to 500Vdc open-circuit. The Stack Series Base positions the battery horizontally, the required orientation per Rubix, and supports up to 3 additional RRS51280 modules in the same physical stack for a single-stack total of 57.34kWh. Additional parallel stacks extend capacity further, up to 64 units and 917.5kWh system-wide, all fed through the same inverter. You will still need to source interconnecting DC cables, a DC fuse or breaker, an AC breaker for inverter output, and any conduit or mounting hardware required by your local installation code.

Why choose this ESS kit?

A1 SolarStore offers this kit because the RRS51280 and Sol-Ark 15K-2P are matched at the spec level — not just at the voltage label. The Rubix battery's UL 1973 cell certification addresses fire-safety compliance requirements common in permit-pull residential installations, while the UL 1741 SB satisfy utility interconnection requirements across most US and Canadian jurisdictions. For buyers building a solar battery backup system for home or small commercial use, that dual-certification combination reduces the compliance research burden that typically comes with sourcing components individually. And because the Rubix R Series is designed around a modular base-and-lid housing, expanding storage later is a matter of adding modules — not replacing the inverter or rearchitecting the system.