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I don't know if this helps but here is my story: I live in an inland valley in Southern California, which I would guess has similar sunlight to the OP's Houston. I have 1 Powerwall 2 running on a 4.5kw array (peaks at 3.6kw). I keep 15% in reserve for morning power outages and on a normal day...

Give her $20 a year and call it even. The project you're describing would simply be for the fun of it, and a good learning experience, but not really practical from a cost/benefit perspective. I see you built one for $600 so nevermind.

Nobody I guess. I'm just saying that the cost/benefit to adding an off grid power system to run a garage door opener where there is grid power doesn't financially pencil out. That thing can't cost more than $20 year to operate. You'll never recover the investment.

Guys, that is what I said. It isn't worth doing for the money, but there are other reasons... However, Denver Guy, you did sort of say it was about the money (bold is mine). That is why I suggested just giving her $20/yr:

A year ago, right before the pandemic, I added a 4500w system with a Tesla Powerwall. I'm happy with the system but I wasn't happy with the contractor. They did some pretty shoddy electrical work and the communication was horrible. I'm also a pretty handy person and am a DIY'er by nature...

I have 15 Silfab SLA-M 300w panels on my roof. They are exceeding the projected outputs and working well.

I replaced the pitifully small subpanel in the garage with a 12 position, 100A one. I wanted to split some of the circuits up a little and add some receptacles on the outside, so it needed to be done. I'm a year or two from doing any enhancements to the service, but I definitely want to start...