I also have 17kw of solar on my roof, and overproduce. I have 1:1 net metering, so a battery will not help financially unless that ends. the only utility a battery provides is backup power
In the middle of summer I will use around 80kwh a day with lots of AC usage (Yes, I could get more insulation, better ducts, switch to minisplits. all in progress)
A lot of that is at night, because it doesn't get any cooler at night really. It still stays hot and humid. Between sun I'm using around 30kwh, so I'd need 3 x Tesla Power Walls JUST TO MAKE THE NIGHT and hope it was sunny the day before to fully charge, and sunny the next day
The cost for that is over $30,000, only makes the night, and still only outputs around the same as the generator. If it's not sunny but it's still warm, I'll be without power in a short time. If I'm spending that amount of money, I want power to stay on no matter what
I'm waiting for Enhpase or Tesla, or someone to come out with an AC Coupled grid tie battery that has full generator support. That is the dream. Then in low solar days it could pre-charge the battery with the generator for night time. I don't want to drop a ton of cash now, when that is surely on the horizon. Either that, or the ability to use a car as a battery. If I could use a Tesla as a battery, I would probably go buy a 100 model Tesla. That would be 100kwh! much better