13kWh Solar Backup: SimpliPHI 48V LiFePO4 Battery + 12kW 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 13kWh Solar Backup: 2× SimpliPHI 48V LiFePO4 Battery 12kW Sol-Ark Hybrid Inverter ESS Kit is a pre-engineered solar battery backup system that pairs two 6.65kWh stackable LiFePO4 battery modules (13.3kWh total) with a 12,000W hybrid inverter and a dedicated battery controller — every component confirmed compatible and ready to install together. Offered through A1 SolarStore as a matched set, this energy storage system eliminates the compatibility research and sourcing friction that comes with assembling a backup power system from separate parts.

What's included

• SimpliPHI 6.6 Battery (SPHI-6.6-LO) × 2 — 6.65kWh LiFePO4 battery modules, 48V nominal; 13.3kWh combined capacity
• Sol-Ark 12K-2P — 12kW single-phase/split-phase hybrid solar storage inverter
• Briggs & Stratton (SimpliPHI) 6.6 Battery Controller — battery management controller unit

One purchase, one verified system

Building a home energy storage system from individual components means verifying inverter voltage compatibility, battery communication protocols, controller firmware, and charge-rate limits — then hoping everything works together on first power-up. This kit removes that process entirely. The two SimpliPHI 6.6 Battery modules and the Sol-Ark 12K-2P share a matched 48V architecture, and the Briggs & Stratton Battery Controller bridges them over CAN or RS485 so the inverter reads real-time battery state and manages charge and discharge cycles automatically — no additional configuration required.

Who this kit fits

• Whole-home backup — 13.3kWh of usable LiFePO4 storage covers essential and non-essential loads (refrigerators, HVAC, EV charging circuits, lighting) through a full overnight outage without a generator
• Solar self-consumption — pair with a rooftop or ground-mount PV array (up to 13,000W) to eliminate daytime grid draw and store surplus energy for evening or overnight use
• Off-grid and hybrid operation — the Sol-Ark 12K-2P supports fully off-grid and grid-tied hybrid configurations, with an industry-leading 4ms transfer switch that keeps sensitive electronics running through brief outages
• Mid-size to large residences — sized for homes of 2,000–4,000 sq ft that need substantial backup capacity without overbuilding the inverter side
• Scalable starting point — expand to 18 SimpliPHI battery modules (~119kWh) as energy needs grow, with no inverter replacement required; stack up to 9 Sol-Ark 12K-2P units in parallel for commercial applications

How the system connects

The two SimpliPHI 6.6 Battery modules stack wire-free on a single Briggs & Stratton Battery Controller, which links to the Sol-Ark 12K-2P over CAN or RS485 — enabling the inverter to read real-time battery state of charge and regulate charging from PV, grid, or generator sources automatically. Solar panels feed into the inverter’s dual MPPT inputs (150–500Vdc, up to 500Vdc OCV, 2 strings per tracker), which charge the 48V battery bank and simultaneously supply connected loads at 120/240Vac split-phase. When grid or generator power is available, the inverter uses it as a secondary charge source or pass-through, with automatic generator start via the integrated 2-wire AGS. The 4ms transfer switch keeps all connected equipment running through brief outages. Buyers will also need DC and AC breakers, conduit, mounting hardware, and all interconnect wiring sized to their specific installation — contact our team for a custom equipment list before installation.

Why choose this solar backup kit?

This kit takes the sourcing and compatibility work out of residential energy storage: every component is pre-matched and confirmed to operate together at 48V, so installation teams can focus on wiring rather than troubleshooting. The SimpliPHI 6.6 Battery’s LiFePO4 chemistry delivers up to 6,000 cycles at 80% depth of discharge and ≥96% round-trip efficiency — a meaningful lifespan advantage over standard lithium-ion cells. Paired with the Sol-Ark 12K-2P’s dual MPPT inputs, 185A battery charge/discharge current, 9,000W continuous AC output, and industry-leading 10-year warranty, and managed by the Briggs & Stratton Battery Controller’s CAN/RS485 communication loop, this 13kWh Solar Backup kit available through A1 SolarStore is one of the most capable pre-verified 48V ESS pairings at this capacity and price point.