Propane generator with extra 5 gal tank. Once you use a tank, you can take it to your big box store and exchange it. In a power outage propane is more practical than gasoline generators as gas stations will not have power to pump gas. The propane in the tanks is about two years old, but propane in tanks lasts for decades without degrading.
Purchased new for $700 in 2013 (have receipt and manual). Run for a total of about 15 hours during two separate power outages in Ithaca. It kept the lights on and saved hundreds of dollars in replacement food costs held by two refrigerators and a freezer.
The starting sequence is detailed near the pull cord. I start it periodically to lubricate the internal parts. One photo shows the grounding wire set up.
More details: https://www.northerntool.com/products/free-shipping-generac-lp3250-portable-propane-generator-3750-surge-watts-3250-rated-watts-model-6000-21951?srsltid=AfmBOopzkf93Gy03Z4k3ex0ieV5_BSQwGWrEVSo5alABc42zDBbYbeBS