OH shit that's me!
Still kicking along. I shut down my blog as I didn't have time or ideas to contribute to it. Was a fun couple of years.
Anyway, the most interesting part of the Powerwall right now is I've noted a slight degree of degradation at this point. Keep in mind the original
usable capacity was 6.0kWh out of the 6.4kWh rated capacity - there is a good reason for this as lithium storage doesn't really like going above or below the 10% margin at each end.
The original warranty looked like this:
I got mine installed end of January 2016, so we're now past the
2 years mentioned in the image above.
Also worth noting they changed the warranty to "unlimited use" in 2016 but were a bit cagey about the degradation aspect.
In any case, I should be able to use 85% of the 6.4kWh capacity, or 5.44kWh
At present I'm still capturing about 5.5-5.8kWh per day by the look of it, so am ahead of the warranted capacity on the figures I'm able to obtain.
It is hard to get a clean figure of capacity, however, because sometimes the battery still has charge in it at the start of the day, so "Energy Captured" is a bit misleading.
What I
can say is that, after the first 12 months of watching every electron like a madman, I've relaxed a fair bit. Even then, I'm still saving around $2k per annum through a mixture of solar, storage, and using the data to figure out when/how to run things.
8 year payback is on track. If I had a Powerwall 2 it would be shorter.