I have a small 900w generator which I run from my garden shed for the odd power cut. Lets me have lights and TV etc but unfortunately won't run my fridge (just won't quite kick it off). Should really fork out for a 2000w to be safe. I Use gas for cooking which is handy for power cuts, and cheaper than power, (9kg lasts me for 3-4 months for $33.) Inverters are another handy thing to have for an emergency. Most people forget they have a big 12v generator sitting in their driveway if you are desperate for light or radio.
Your car will idle for days (depending on fuel and cat converter) and you can rig a system round your house to run 12v 5w car lamps (or better still LED lamps) which will light your whole house. you can run you car continuously as needed or just for re-charging, You can also charge your phone, cameras, watches etc. I did a test on a 12v 5w boat riding light on a dud 12v car battery run 24/7 and it was still going strong after 4 days, at which point I gave up. The lamp was enough to light the whole lounge up enough to move around safely. If you have a Tesla you're fine for years😁