The lot gets a holding tank for plumbing, a well and solar power with batteries.

@Daniel T Stockman I like these too but routinely change the batteries about once a year.

Seems RentRedi, Turbotenant are two popular onesI have a Kwikset on my house in Florida, don't remember the exact model but I wouldn't buy it again - the gears and innards are nowhere near as stout as the non-smart Schlage I took off of it, and it's a battery eating monster.

Honda has invested $3.5 Billion in Fayette County for a plant that will make batteries for electric vehicles. https://www.dispatch.com/story/business/automotive/2023/02/28/ev-battery-plant-in-fayette-county-to-employ-2200-workers/69933524007/According to Licking County Auditor records, Amazon Data Services Inc. bought 392.11 acres of land ($ $116,653,320.) on the west side of Beech Road and straddling Miller Road on January 17, 2023. 

What if it's got a battery back up. 

The kids don’t maintain the yard, are hard on walls and appliances, don’t change air filters, take down the smoke alarms instead of changing a battery and they always sneak in pets that are not on the lease.

You have to stock it with water, empty the tanks, keep the batteries charged, replace the consumables, clean after every guest, etc.After accounting for delivery costs, parking costs, and personal time, it wasn't worth the hassle.

Could just be the back up battery.. they sometimes cause a hummmmm

The batteries and perceived maintenance is what scares people, and for good reason.

That's is what I have used for about 8 years and it has never failed me, never needs batteries changed, and is as simple as it comes.