I figure  it would take to run on solar and battery bank system $30k.

@Anthony SimboliYou can go to ASHI.org and search for a certified one, they passed a battery of tests to become certified and follow a code of ethicsPaul

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Home Depot makes a $40 weed whacker that uses the same 18V battery I have in my power drill, so the frustration associated with maintaining it is minimal.I would second the wood chips, fake grass, and would also throw in pebbles or gravel.  

I have general lights but apparently, the emergency lights need to be connected to some sort of battery(I’m not an electrician) and piping in order for the lights to stay on in case of a power outage.

HI IS THERE SUCH A THING AS A WIRELESS BATTERY OPERATED HALWWAY LIIGHT WITH A MOTION SENSOR, THAT IS BRIGHT ENOUGH TO BE ABLE TO SEE AT NIGHT ON STAIRCASE?   

Don’t go with battery operated Security Cameras for your smart home setup.

You need to know what exactly is there and if it has value (the contract, the person's electric bills past two years, and an inspection of the batteries/panels/and roof).

DeWalt's 18V XRP batteries are NiCads and, as such, exhibit all the usual NiCad issues such as "memory" and self-discharge.

I've also welded a broken top link on a bush hog with 3 car batteries and jumper cables in the field.