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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

There are 2 main apps on the hubitat platform that work well with the Tesla APIs. One is local network monitoring only (I use this), the other can issue mode changes as well via the cloud. Plenty of discussion on the hubitat forums. I have it send me a notification when the battery is...

I do this with Hubitat and the Tesla integration app. It triggers at 99% since the API doesn't match the Tesla App % exactly, but the charging rate is below 1KW then anyway.

https://www.tesla.com/support/energy/solar-panels/after-installation/get-help-and-schedule-service

The last time it triggered for me, it was charging at high rate during peak power, and the local weather didn't look like it was going to be affected by whatever it had picked up. I was watching every kWh every day to maintain a positive balance, so I didn't appreciate it being wrong then. Now I...

Regretting not turning on storm watch earlier today. Darn app decided to do self-powered most of the day even though it was set to time usage, so it trickle charged during the few bright spots of sky and only got to 94% before peak.

DIY install probably not realistic: https://teslamotorsclub.com/tmc/threads/diy-powerwall-install.210189/ If you can find an installer where you're providing the parts, they'll still need to make a profit on the install, and they can't offer a warranty on those used parts, so they'd need to...

Has anyone has done this successfully? I'm concerned It may appear to work, but if the inverter breaks (which is quite high probability), Tesla comes to check it, has to ask SolarEdge to diagnose it remotely, and they find there's been no telemetry for months, so the will-I-wont-I-get-a-RMA...

Basically you can't ditch the zigbee or connect via Ethernet. I connected Ethernet to everything else though.

It's always the CTs. The sensors on the main feed are not configured correctly, call your installer.

Yeah, on the plus side it's cash that you can use to pay for NFCs and daily charges, on the minus side you don't get it until March the next year. I'm thinking more inline with JJ, I don't want to give up the best feature (backup into the night) on the days it's most likely to be needed.

SCE new program - With one PW, I'm still not convinced I can get any value out of this program. I'm pretty much using the whole PW capacity down to reserve (20-25%) between 4pm-9pm in balanced mode, so any extra they call for is going to put me at reserve before 9pm. I switched to self powered...

A Generator cannot sink any current, so having it exposed to the solar power at any time is a recipe for spectacular failure. The solar and battery are always connected, so the generator cannot charge the battery even without solar. So what's left is the Generator being able to feed the load...

Life is much simpler at 200Amp. Even with 2 EV chargers, you really don't want them both going full tilt at the same time, you'd time shift them.

1-1.5KW, will sip less than that if you get a nice one that modulates output. Cooling-only units are certainly cheaper than full heat pump,. DIY Mr Cool units are more expensive, they charge more for their refrigerant-shipped-in-the-pipes patent, and the units themselves aren't the best...

Socal Gas changes their base tier of therms every month. Even after I switched to Heat pump, our gas water heater + clothes dryer + cooking usage was still at or above the base. The charges for over baseline therms are more expensive than the equivalent heat pump KWh, and are likely to go up...

Did your gateway get the new firmware update in the last couple of days? I'm guessing that it lost all memory of normal usage, so it needs a week to learn again. Also check that the peak times / costs haven't got reset. What you describe is what it does if it doesn't know / doesn't think...

Once you have Powerwalls, it becomes a game of "how much money can I avoid paying to the energy company, and how much money can I get them to pay me for my exports" To that end, the first and most important number is not the overall export, but the peak time (e.g. 4pm-9pm) exports. My 1...

Seeing an average below 3 kWh/day, family of 4, actually <2.5 this last month as the incoming water is warmer. Resistive heating will 4x that though.

What does this show? Settings -> My Home Info -> Release Notes I have gateway 22.18.3 but the release notes only mention 22.9 from April

Relevant: https://teslamotorsclub.com/tmc/threads/powerwall-2-transfer-time.153496/

SCE is different. There is a demand response program that pays $2/kWh, but you have to be in a CCA. https://powersaver.sce.com

Yes, get the quote for the system with 2 batteries. My timeframe for hoping battery prices go down is 5-10 years, not 1-2.

It also leaves it open for you to add another battery in the future without having to invasively reconfigure the existing wiring.

You may need to sign a waiver for the design, but having both inverters on the load side (backed up) is possible, but is not recommended by Tesla. There's only one frequency when you're island-ed, so worst case is that both inverters are putting out too much power for the powerwall, and the...

Also on my SCE bill I have · Net Surplus Compensation option: Exclusion Which I am not clear on, I'm thinking it means I won't get any payment of the wholesale rate for any surplus at year-end. I think this line changed when I added extra solar which pushed me over some tier.

This is not true for SCE. Minimum Daily does not offset anything, it is a constant. The only reduction there is the twice yearly Climate Adjustment, about $40-$50

With a CCA, I found they don't accumulate charges, only credits. Since the SCE delivery charges are the higher component of one kWH, over the year you create a credit with SCE faster than generation via CCA. So generation nets to zero earlier in the year, and you lose the ability to offset...

Another NBC related question, is this correct? SCE - the NBCs are paid monthly PG&E - the NBCs are accumulated and paid yearly at true-up, but you get a true-up reminder every 3 months? Minimum / daily charge is paid monthly for both. Climate credit twice a year does offset NBCs. I prefer the...

I think the algorithm will change over time. There's a element of usage forecasting going on there too. Should it blindly discharge from the start at max rate down to the reserve, or just pump out a little more than needed to reach reserve around the same time as end of peak power, or wait...

Are you sure? VPP = Virtual Power Plant (beta) = PoCo driven events, Energy Exports is a daily thing. I ran that for a trial and it just runs the battery down to reserve each day. Other states had varying degrees of extra compensation for VPP export, where Energy Export is going to be purely...

Anyone in SCE area have VPP in the app? It was visible a while back, and I deliberately turned it off, but I can't see it any more. The app on iOS spins for several seconds every time it starts up now, used to be quick.

Yeah, I'm in the middle of installing an iotawatt to get better individual monitoring that I can use in automation.

I always suspected that the Tesla app was over-estimating my solar output, as the home usage graph always had a slight bump up centered on solar noon. (Home usage = PoCo - Solar) This weekend I opened up the panel and checked with my Fluke. The actual situation is more complicated - the...

It seems risky not to have the solar/battery system included in the home insurance policy, but what are people actually doing? Stated value equal to installation cost, cost after ITC, some other smaller number? "Other equipment" is usually capped at e.g. $5K, so that would never cover the...

For certain (olde?r) SolarEdge inverters, no. The Zigbee connection is the only way that the inverter can get firmware updates (rare, but possible) The hard wire ethernet is OK for Tesla monitoring, but it does not provide monitoring data to SolarEdge/Envoy servers, so they will nag Tesla and...