Here is our solar decision table:

AspectResultCommentLong term payoffYes22 years to break even from the initial outlay. See [1] and [2].Short term payoffNo$300 mortgage + 120 (avg) per month, $2000 bonus, $40,000 refund after fed. tax creditImproves property valueYes5% (on avg.) return on property value, protects roofLow maintenance YesExpandableYesImmunity from blackoutsYes**Mostly. If the power is out for weeks, then we'll likely have some partial blackouts at night.Creates value immediately YesCarbon reduction, power backup, Future oriented solutionYesA passing fadNo

[1] $40,000 solar voltaic system cost divided by the remaining electric bill 

If I didn't by a PVE system, the average cost would be $300/month.  However, with the PVE system, the new average cost is $150/month.  So the system is providing a cost avoidance of $150/month.

Which brings the payoff date to 22 years.

[2] In Texas, my house value will be worth more than 5% due to increased desirability, so this means if I sell my house, the extra value meets or 

exceeds the PVE system cost.  So if I don't stay for 22 years, I'll make back my investment. 

About the difference between kilowatts kW and kilowatt hours kWh: https://greenpowerenergy.com/the-kw-and-kwhr-of-your-home-solar-system-explained/