Sunroof doesn't operate in Texas, and perhaps because it's not worth it due to the structure of electricity rates. In California, we've got tiered rates that punish high usage - buying your electricity in Costco-sized bundles costs more than buying it in convenience-store tiny bundles. The statewide solar initiatives (CSI) is done, kaput, played out, but used to pay as much at $2.50/installed-watt or 39c/kwh - but it ended at 20c/installed-watt or 2.5c/kwh. The 30% federal tax credit's the sole big remaining inventive, until the end of 2016.
Here in the Bay Area, one of the few regions where Sunroof actually is operating, residential electric rates start at 16c/kwh (Tier 1), but rise to 19c, 28c, and 34c (Tier 4) as your usage increases over "baseline". If you size your system to knock out Tier 3 & 4 usage via net metering, the payout's much quicker.
If you combine net metering with time-of-use metering, the payout time can be even sooner, as the Weekday (Monday-Friday), "summer" (May-October), Tier 4 rate reaches 49c/kwh at times of high demand and 38c/kwh at medium demand. The high demand period runs 1pm-to-7pm, and medium-demand runs 10am-to-1pm and 7pm-to-9pm, so the sweet-spot daylight times for solar are generally net-metered at medium-demand and high-demand rates. Notably, this means that west-facing solar panels get a sweeter payback than either east-facing or south-facing on a typically-sloped roof.
As a rough figure, this probably puts payback times into the 3-to-7-year range, depending on cost of installation and orientation of the panels. It takes a lot longer to break even if you're trying to zero out your utility bill, because if you try to drive your net-usage all the way to zero, you're net-metering down at the 16c level, actually 13c during "winter" season (November-April). If you oversize your system and try to get a net payment from the utility, they only pay about 3c/kwh for excess power.
As an aside, I used this opportunity to check out the TOU rates to see what the average rate is for, say, a continually-running server, and it looks like the TOU schedule is 0.78c/kwh lower than the standard tiered rate plan. For me, that was one one of the questions to consider whether going for a TOU plan was going to hurt my bill.
For other stereotypical Californians (not me, not me, it's for a friend, really), a grow lights for ...umm... plants might be a similar issue - but typical schedules for grow lights & heat cycles are 12 hours/day - perhaps you can reverse day for night, and grow your plants with off-peak power FTW? Or supplement with actual sunlight during peak hours?