[nightski]

In my state electricity costs about $0.089/kWh. We spend about $100/mo on electricity total which comes out almost exactly to your 30kWh/day figure (with a $23.15 connection charge included).

Invested that 40k would conservatively cover over 2x our electricity bill without touching the principal (inflation adjusted).

That's a pretty hard sell for solar. Obviously incentives will improve things but it just seems less financially risky to use grid power.

[bdhdbebebeb]

10 years ago for me math didn't add up for batteries and offgrid but it did add up for solar.

Offgrid added up if you are already offgrid so that ongrid becomes a big expense when comparing.

[fred_is_fred]

That’s where my math went. 30k- 12 years to get back to the investment. 30k in the s&p is worth a lot more than 30k…

[toomuchtodo]

Residential solar PV and batteries should be treated as a bond return and performance, and not equivalent to investment in equities, as it is insulating you from future utility rate increases.

https://www.bogleheads.org/forum/viewtopic.php?t=411421