[aeternum]

For safety gas needs to be shut off during many emergencies. Solar panels and battery backups are probably better as they are less dangerous and less prone to common-mode failures than gas. As you mention, a woodpile is also a nice low-tech and low-risk backup.

[shadilay]

Most solar installs are grid tied and add no emergency redundancy.

[aeternum]

Powerwall can be both grid-tied and allows emergency redundancy. It disconnects from grid during an outage.

[desine]

Unless you have a modicum of electrical knowledge, a willingness to break some small safety regulations/laws, or lacking the former, a thirst for danger

[shadilay]

I like most rational people have no desire to be fined by my cities code compliance officers.