So just a few hours worth of storage are actually really useful to integrate a significantly higher amount of renewables in the power mix.
So I looked around. There is another company that would charge $0.19 for power consumed, and $0.20 for feed-in, with a catch. The catch is encoded in a complex formula, but it boils down to "we hit you hard if consume power during the 4 hour peak hour period at _any_ time during the 90 day billing period".
My battery isn't big enough to supply an entire day or act as a back up during an extended power outage - but it can easily shift the 4 hours power usage this plan needs. Just doing that makes a big difference since we produce twice what we use. Who would have thought just having a 4 hour battery could drop your power bill by 1/3?
Even more impressively, the battery says on the box it is good for 6,000 cycles. But they are full cycles, and if I just use it for 4 hours I'll never use a full cycle. It could last over 20 years if I only draw on it 4 hours a day.