Recent content by tomuo

Last year SoCal gas central heating users probably got whiplash from the therm pricing changes from production/pipeline shortages. If I had a choice, I'd probably do multiple mini-splits instead of one larger heat pump for the central system, would give me finer control over where and when the...

I'm implying that the small fall-off each year is indicating the degradation, since the round trip efficiency shows it took more kWh to reach 100% in the later years. We don't know how the powerwall measures its own nominal full pack energy, but it must be based on the same base data, how much...

Simply dividing yearly powerwall numbers discharged/charged from the tesla app: 2021 - 90% 2022 - 89.5% 2023 - 88.9%

In my case, the first system was installed by Tesla, but the 2nd by Semper Solaris, so they likely were separate accounts on Tesla's back end servers, and have different network connections, that were joined so they both show up. In your system,they're probably only showing you the aggregate...

Powerwalls can use up to about 200W doing nothing, but there's no requirement that that load has to be sourced from Solar power. So the gateway algorithm for California may be deliberately allowing that small amount to come from the grid and thus letting you export more of your excess solar...

Exactly that. SolarEdge inverters follow the curtailment spec with a hard cut-off - once the frequency goes up past a small threshold, they turn off completely. Micro Inverters have a more linear curtailment, the higher the frequency offset from nominal, the more the curtailment. The adjustment...

This would have been cool to see realized (from 2016): https://www.caranddriver.com/news/a15347021/bmw-i3-batteries-to-be-recycled-for-home-use/

I automate an OpenEVSE directly from Hubitat, currently matching charge rate to excess Solar production. That works great, but some vehicles don't respond well when the pilot goes off. They will stop, but my i3 reports an error if it turns on and off a couple of times back to back. Better...

Ask Tesla to look at the gateway logs. I had a similar event a while back and the logs showed the gateway had detected unexpected voltage on the neutral (which should be zero). In my case it was a wiring problem (dual circuit shared neutral landed in the wrong place that only unbalances when...

I used Semper Solaris in Los Angeles. Solid company.

The 80% continuous load rule is for individual circuits though, right? It doesn't apply to the grid connection?

They need to flip the polarity of one leg of the grid monitoring CTs. Very common installation mis-step. Should be trivial to do via the remote management login page.

Best to ask the creator of the hubitat driver: https://community.hubitat.com/t/project-driver-for-connecting-to-your-tesla-devices/41375/275

It's hard to find the details of why off grid residential is not allowed, but this older article helped http://klinedinstlaw.com/wp-content/uploads/2016/02/how-title-24-is-keeping-california-connected-to-the-grid.pdf

Yes! I use this driver and a simple rule https://www.drdsnell.com/projects/hubitat/drivers/TeslaDriver.groovy