It depends on what you want to run at the same time.

• Essentials only (fridge, lights, Wi‑Fi, phone charging, gas furnace blower, sump): about 3,500–7,500 running watts can be suitable when loads are managed.
• More circuits (well pump, window A/C, microwave): 7,500–10,000 running watts may be helpful.
• Near whole‑home including central A/C: 10,000+ starting watts are commonly needed; this often points to larger portables or a standby solution.

Match 120/240V needs (well pumps and dryers often need 240V), check starting vs. running watts, and consider a transfer switch for safer hookup. Always operate generators outdoors; CO‑shutdown features add protection but aren’t a substitute for placement and ventilation. A licensed electrician can help size and connect appropriately for your setup.

Runtime per gallon varies with generator size, load, and Eco‑mode settings.

• Small inverter (≈2,000–2,500W): at lighter loads, 1 gallon can often run 5–10 hours.
• Mid‑size (≈3,500–5,000W): at moderate loads, 1 gallon may last about 1.5–4 hours.
• Larger portables (≈6,500W+): under heavier loads, expect roughly 1–2 hours per gallon.

Product pages typically list runtime at 25% or 50% load—checking those specs offers the best estimate for each model. Using Eco‑mode, managing which appliances run simultaneously, and keeping filters and oil maintained can help improve efficiency, but results vary. Always shut down and allow the unit to cool before refueling.

A 5,000‑watt portable can cover many essentials with smart load management.

• Often feasible: refrigerator (may surge higher at start), gas furnace blower, sump pump, lights, router, TV, small kitchen appliances.
• Typically challenging: central A/C, electric ranges, electric dryers, or multiple large motor loads at once.

Check both running and starting watts for each appliance and confirm if you need 120/240V output. A transfer switch or inlet installed by a qualified pro can make operation safer and more convenient. Keep the generator outdoors, away from windows and doors, and use heavy‑duty, outdoor‑rated cords if powering items directly.

A standard 20 lb propane tank holds about 4.7 gallons. Runtime depends on generator size, load, and efficiency.

• Small inverter on light load: if usage is around 0.2–0.3 gal/hour, a tank could last roughly 15–20 hours.
• Mid‑size unit at moderate load: at 0.5–0.8 gal/hour, expect about 6–9 hours.

Higher loads and cold weather reduce runtime. Many dual‑fuel generators list propane consumption and runtime per load on the product page—using those figures gives the best estimate. Keep tanks upright, check for leaks, use the correct regulator and hose, and operate generators outdoors with adequate clearance from buildings.

Running watts are the continuous power a generator can supply. Starting (surge) watts are the short burst needed when motors (fridges, pumps, compressors) first kick on.

• Planning tip: total the running watts of items you’ll use together, then add the largest single starting surge.
• Leave headroom: extra capacity can reduce tripping breakers when devices cycle on.
• Sensitive electronics: inverter generators provide cleaner power; some models allow parallel use to increase output.

Product pages usually list both ratings. Matching these numbers to your appliances can help you choose a generator that’s comfortable for your needs without overloading.