Whole-House Standby

If you live in a hurricane state, a winter-ice corridor, or anywhere on California's PSPS map, the math for a permanent standby usually works. Auto-start in under 10 seconds, runs on existing natural-gas line or a buried propane tank, and powers central AC, well pump, electric range and EV charger simultaneously at 26 kW. Cost: $7,000–$12,000 installed by a licensed electrician.

If you lose power once or twice a year, a portable inverter generator is the smarter buy. The Honda EU3000IS at $2,399 or the Champion 4000W dual-fuel at $1,099 cover most home essentials — fridge, lights, modem, a small AC — and require nothing more than a $300 manual transfer switch and a 30A inlet. They also come with you for tailgates, RV trips and job sites.

The middle path is a battery + portable generator hybrid: an Anker SOLIX F3800 plus a small portable. Battery handles silent overnight backup and indoor-safe operation; portable handles multi-day outages and refuels the battery when sun is unavailable.

Start with your essential loads: fridge (200W running, 800W start), well pump (1,000–2,000W start), gas furnace blower (500–800W), modem and lights (100W), and one comfort item (window AC ~1,500W or microwave). Total essential: 3–5 kW with simultaneous starts.

Add up your full-home loads if you don't want to manage circuits manually: central AC (3–5 ton runs 3,500–7,000W with 4× surge on startup), electric range (8–10 kW peak), electric water heater (4,500W), dryer (5,500W), EV charger (7,200–11,500W). Now you're at 20–30 kW peak — that's why the Generac Guardian 26kW exists.

Most U.S. homes don't need 26 kW. A 14–18 kW unit handles essentials plus AC and a range, with the rest on a load-shedding module. The 26 kW only earns its keep if you have a well, an EV, and refuse to manually turn off the dryer during an outage.

Natural gas: if your home already has a gas line, this is the easy choice. Unlimited runtime, no refueling, slightly lower output than propane (BTU content is lower). Generac 26kW with a gas line will run for weeks.

Propane: needs a tank you maintain — a 500-gallon residential tank gives roughly 7–10 days at full load on a 26 kW unit. The fuel doesn't go stale and is widely available in rural areas without gas service.

Gasoline: only practical for portable inverters. Goes stale in 3–6 months without stabilizer; the supply chain breaks during multi-day events (gas stations need power too).

Dual-fuel: the Champion 4000W runs on either gas or propane. Best of both worlds at the cost of slightly lower output on propane. We recommend dual-fuel for any portable buy in 2026 — fuel-supply diversity is real risk reduction.

Permanent standby installation requires a concrete pad, gas/propane plumbing, a transfer switch, and a building permit. The unit is 30% of the cost; the install is the other 70%. Get three quotes; the spread between licensed electricians can be 2×.

For portable inverter generators, never run them in a garage or near windows — CO poisoning kills people every storm season. Modern units (Champion, Honda EU3000IS) have CO-Shield / CO-MINDER auto-shutoff, but treat that as a backup, not a primary plan. Always position 20+ feet from any opening, downwind, with the exhaust pointed away.

Most jurisdictions allow portable use without a permit but require a permit for permanent transfer switch installation. NEC 702 covers optional standby systems and is enforced strictly in CA, FL, NY and TX. Hire someone who has pulled this permit before.