Some of mine are too lazy and cheap to change the smoke detector batteries.

I have put all battery operated digital locks on my doors and change the combo with each tenant.

I gave them my reasons, the high bills, the no longer being able to feel comfortable at home doing anything, not being able to recharge my batteries in a way, not feeling like it was my home, feeling like a third wheel (which roommate sarcastically replied with "ohhhhh Wow").

Most reviews are saying 1-2 years per set of 4 AA batteries.

There already are several battery ones. 

The new Facebook Data Center will create 100 jobs, invest $800 million into the state, 450 megawatts of new, renewable energy projects, 200 million gallons of water a year will be restored and 60% less water usage than the average data center.KORE Power will be the first lithium-ion battery manufacturing facility wholly owned by a US Company is coming to Buckeye, AZ.Arizona is the #3 state in the nation for job recovery per AZ Office of Economic Opportunity.Arizona is in the TOP 10 states for economic momentum per state policy reports, 2020.

Additionally, with the fire risk in my area we experience a significant number of mandatory power outages to mitigate fire risk, so those panels (plus the back up battery) actually added a significant amount of value to my home.

It never never needs batteries and has never failed me.

For the inspection, do it twice a year to check batteries in smoke detectors (and CO detectors) and to change the filters on the furnace.

If you don't mind the chore, you can even park the RV without connecting utilities (solar + battery; filling clean water tank; emptying dirty water tank; etc.).I am not sure which option is more economical.