Franklin WH aPower Plus Specifications & Review

The aPower Plus significantly upgrades the original aPower: capacity increases from 13.6 to 15 kWh, continuous power doubles from 5 to 10 kW, peak power increases from 10 to 15 kW, and the warranty extends from 12 to 15 years. Most importantly, the aPower Plus adds DC-coupled mode support (the original aPower is AC-coupled only), allowing direct solar panel connection. Round-trip efficiency improves from 89% to 90%. The physical form factor remains identical.

Yes. The aGate energy management gateway is required for full backup functionality, automatic grid disconnect during outages, load management, and monitoring. Without the aGate, the aPower Plus functions as a basic AC-coupled battery without backup capability or intelligent energy management. The aGate is a one-time purchase that supports up to 15 aPower Plus units.

Yes. The aPower Plus can simultaneously accept DC-coupled solar input (from panels wired directly to its DC input) and AC-coupled charging (from an existing solar system feeding through the home's AC bus). This dual-mode operation maximizes solar charging efficiency by routing as much solar energy as possible through the more efficient DC path while still accepting AC-coupled excess from an existing system.

The aPower Plus offers slightly larger capacity (15 vs 13.5 kWh), better scalability (15 units/225 kWh vs 4 units/54 kWh), longer warranty (15 vs 10 years), and dual AC/DC coupling flexibility. The Powerwall 3 offers a built-in 11.5 kW solar inverter with 6 MPPTs, higher round-trip efficiency (97.5% vs 90%), the Tesla app ecosystem with Storm Watch, and a more streamlined all-in-one design. The Powerwall 3 is better for new installations wanting simplicity; the aPower Plus is better for retrofits, massive scalability, or mixed coupling scenarios.

Up to 15 aPower Plus units can be combined for 225 kWh of total storage and 150 kW of continuous power output. This is the largest residential battery configuration available from any single manufacturer, exceeding even small commercial battery systems. Systems of this scale are suitable for large estates, small farms, home-based commercial operations, or homeowners pursuing complete energy independence.

The aPower Plus, through the aGate gateway, detects grid outages and switches to backup power within approximately 10-20 milliseconds. This is fast enough to prevent most electronic equipment from restarting, including computers, networking equipment, and televisions. Some sensitive equipment (UPS-protected servers) may still detect the brief interruption, but household electronics will typically experience seamless transition.

Yes. In DC-coupled mode, the aPower Plus can function as a standalone solar-plus-storage system for off-grid applications. With up to 15 units providing 225 kWh of storage and 150 kW of power, the platform can support even demanding off-grid scenarios. The aGate manages load priorities and generator integration for hybrid off-grid setups. Pair with a solar array sized 1.5-2x your daily consumption for year-round reliability.

The Franklin WH monitoring platform (accessible through the FranklinWH app and web portal) provides real-time energy flow visualization, battery state of charge, solar production, grid import/export, backup status, and historical analytics. The aGate gateway provides the monitoring connectivity via WiFi or Ethernet. The platform supports over-the-air firmware updates for performance improvements and new features. Per-circuit monitoring is available when the aGate is configured with the home's circuit panel.

With 15 kWh of usable capacity, the Franklin WH aPower Plus can power essential loads (lights, fridge, router, phone charging) for approximately 20 hours. Powering a full home with AC and appliances, expect roughly 5-8 hours of runtime.

The Franklin WH aPower Plus uses LFP (Lithium Iron Phosphate). LFP batteries are known for exceptional safety, long cycle life (typically 5,000-10,000 cycles), and thermal stability, though they have slightly lower energy density than NMC alternatives.

Yes, you can connect up to 15 Franklin WH aPower Plus units together for a total capacity of 225.0 kWh. Each additional unit increases both storage capacity and peak power output.

The Franklin WH aPower Plus comes with a 15-year warranty. This covers defects in materials and workmanship, and typically guarantees the battery will retain at least 70% of its original capacity by the end of the warranty period.

A typical central air conditioner requires 3-5 kW to start and 1.5-3 kW to run continuously. The Franklin WH aPower Plus provides 10 kW of continuous power and 15 kW of peak power for startup surges, which is generally sufficient to run a central AC unit alongside other essential loads.

Yes, the Franklin WH aPower Plus qualifies for the federal Investment Tax Credit (ITC) under the Inflation Reduction Act. As of 2026, homeowners can claim a 30% tax credit on the cost of battery storage systems, including installation. The battery must have a capacity of at least 3 kWh to qualify. At 15 kWh, the Franklin WH aPower Plus exceeds this minimum. The credit applies whether the battery is installed with new solar panels or added to an existing solar system. Consult a tax professional for your specific situation.

The Franklin WH aPower Plus is rated for 6,000 cycles at 100% depth of discharge. With typical daily cycling, this translates to approximately 16 years of daily use. LFP chemistry is known for excellent longevity, and many LFP batteries continue to operate well beyond their rated cycle life, often lasting 15-20+ years in residential use.

The Franklin WH aPower Plus can be part of an off-grid system, especially when stacking multiple units (up to 15) for a total of 225.0 kWh of usable storage and 150.0 kW of continuous power. A fully off-grid home typically needs 20-40 kWh of storage depending on energy consumption, climate, and solar array size. The aPower Plus is DC-coupled, which is ideal for off-grid setups due to higher charging efficiency from solar panels. You will also need a sufficiently sized solar array and a compatible inverter with off-grid or islanding capability.