5kWh Solar Backup: Rubix 48V LiFePO4 Battery + 5kW SRNE 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 5kWh Solar Backup: Rubix 48V LiFePO4 Battery 5kW SRNE Hybrid Inverter ESS Kit is a pre-matched solar battery backup system that pairs 5.12kWh of LiFePO4 storage with a 5,000W 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 RS51100 Stack Series Battery — 1× 51.2V / 100Ah (5.12kWh) LiFePO4 deep cycle battery module
• SRNE HF4850U80-H Hybrid Inverter — 1× 5,000W continuous / 10,000VA peak, 120Vac single-phase
• Rubix Stack 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 RS51100 and HF4850U80-H as a pre-engineered pair: the inverter's 48V battery port and 80A solar charging current align directly with the Rubix battery's 70A max continuous charge rating, and the SRNE's RS485/CAN communication interface pairs with the Rubix's built-in inverter communication selection — no workarounds needed.

Who this kit fits

• Residential home backup — 5.12kWh 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 5,200W to 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 163.84kWh.
• 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 RS51100 connects to the SRNE inverter's 48V battery terminals via M8 bolt-on lugs (torqued to 20 ft-lbs). The inverter charges the battery through its MPPT solar input — accepting up to 5,200W of PV at up to 500Vdc open-circuit — and supplements charging from grid or generator at up to 40A. The Stack Series Base positions the battery horizontally, the required orientation per Rubix, and supports up to 5 additional RS51100 modules in the same physical stack for a single-stack total of 30.72kWh. Additional parallel stacks extend capacity further, up to 32 units and 163.84kWh 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 RS51100 and HF4850U80-H are matched at the spec level — not just at the voltage label. The Rubix battery's UL 9540A certification addresses fire-safety compliance requirements common in permit-pull residential installations, while the SRNE inverter's cETL UL1741 and CSA C22.2 listings 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 Stack 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.