There are two power systems, battery operated or hard wired, which allow the meter to communicate with a wireless router that sends the data to a database at the company (this is accessable to you the owner/property manager via the web) and then a bill is sent to the tenants automatically at a interval that you set.

Taxes/ year: $3,002,  Insurance: $1,573,  Trash/ year: $654,   Electric/ year (exterior lights): $420,   Water/ year: $1,200 sewer/ year: $1,500,   Spray for bugs/ prevention: $311/ year,    Lawn cutting/ year: $640,   Misc (furnace filters/ 9v batteries): $250I have gotten mixed reviews back from my colleagues when they go over these numbers with me.

I ordered the 6Amp batteries on eBay.

It works great batteries last about 10 months or so. 

I would still offer key so incase the batteries go dead or the lock gets stuck. 

It works great, but I need to change the 4 AA batteries every ~3 months.

Clearly I can't expect anyone to magically connect a neutral wire but I'm wondering if anyone has ideas past battery powered lights to give these guys some light.Of course... being from Africa living in a tent they live that way here too and cover the windows and walls entirely.

So, I invested in VictorPest Rat Zapper (Victor is the company that makes the original snap mouse traps) It runs on batteries and it zaps the rats with electric voltage, they die instantly.

Another nice tool was a battery operated metal skill saw.( I have a bosch 18v) 2 of the roofs had hips..

This is cheap with battery-powered materials, if your local code allows it, significantly more expensive with hard-wired models if your local code doesn't allow them.