Home battery storage vs whole-home generator

Battery storage vs whole-home generator: two ways to keep the power on. Compare cost, runtime, maintenance, and which pairs better with solar.

A home battery system (Tesla Powerwall, Enphase IQ, LG RESU, Franklin WholePower) stores electricity from the grid or solar panels and automatically powers your home during outages. A single battery unit (13–15 kWh) costs $10,000–$18,000 installed and provides 8–12 hours of essential loads (fridge, lights, Wi-Fi, charging). Two or more units can cover a full house for 24+ hours. Batteries are silent, produce no emissions, require zero maintenance, and qualify for the 30% federal solar/storage tax credit when paired with solar panels. A whole-home standby generator (Generac, Kohler, Briggs & Stratton) runs on natural gas or propane and kicks in automatically within seconds of an outage. A 20–24 kW unit costs $5,000–$15,000 installed and can power an entire house indefinitely as long as fuel is available. Generators require annual maintenance ($200–$500/year), produce noise (60–70 dB), emit exhaust, and need a concrete pad and gas line. For homes with solar, a battery is the natural complement — it stores daytime production for nighttime use and provides clean backup. For homes without solar in areas with multi-day outages, a generator provides unlimited runtime.