I can't tell if they currently have me set up for whole home house backup or if my a/c is excluded? Can anyone decipher this for me?
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There is no description of what loads are moved to the backup panel (N on the diagram). Details are not needed for pulling a permit, but you are entitled to know because you are the one buying the install. The math will not change. List your breakers by Amperage and breaker size and give them a list and ask them to verify which ones.
Hopefully, @holeydonut is correct? Trust, but verify is always a good philosophy, especially when dealing with any installer and any IOU.
The panel labeled X is a 225A panel. According to the note, all loads which were in the original main service panel E, are to be relocated to X. This is a whole house backup.
@holeydonut, see the note that says "the maximum output current ... towards the main panel ... is controlled electronically". Regardless of your experience, I don't see why PG&E would object to this configuration.
While I have been interested in your story of exceedingly poor treatment by PG&E, I don't think it's useful to extrapolate solely from your experience in advising others. The rules are fairly well spelled out, and designs that follow them generally don't elicit such a negative PG&E response.when I explain what PG&E
While I have been interested in your story of exceedingly poor treatment by PG&E, I don't think it's useful to extrapolate solely from your experience in advising others. The rules are fairly well spelled out, and designs that follow them generally don't elicit such a negative PG&E response.
Cheers, Wayne
Thanks! I had the a/c replaced just so it would be compatible so that is good to hear. Tesla actually recommended a few more solar panels but that is all the roof would accommodate.The panel labeled X is a 225A panel. According to the note, all loads which were in the original main service panel E, are to be relocated to X. This is a whole house backup.
@holeydonut, see the note that says "the maximum output current ... towards the main panel ... is controlled electronically". Regardless of your experience, I don't see why PG&E would object to this configuration.
The factors that go into sizing conductors and OCPD do not include tweets. When Tesla updates their PW spec sheet with a higher inverter continuous output current, or their installation instructions to call for a larger conductor, then it will be time to expect installation practices to change.Well except that conductor size for her Powerwall v2.1's.
thats what my gut is telling me now with the data. i have less concerns. just want to know why elon said NovemberThe factors that go into sizing conductors and OCPD do not include tweets. When Tesla updates their PW spec sheet with a higher inverter continuous output current, or their installation instructions to call for a larger conductor, then it will be time to expect installation practices to change.
Personally, I doubt there will be a change to existing hardware that will entail using anything bigger than #10 Cu conductors and 30A breakers for a Powerwall. My guess would be that the maximum continuous output current stays at 24A, and the most that changes is an increase in the peak power output (surge capabilities). That will help with motor (HVAC) starting, but that's about it.
Cheers, Wayne
I am wondering how much time exactly I should put in to trying to decipher this. (I have a hard science degree and want to take it all in but also want to trust Tesla knows what they are doing)
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It may be because her solar is only 11.4. On my 16.32 with three PWs we had to upgrade the main panel from 150 to 200, in Los Angeles, though, not SCE.Assuming your AC breaker is being moved to the new 125 Amp sub-panel box labeled [X], your AC will be backed up.
I'm still trying to figure out how you're getting 3x Powerwalls with 125A service. PG&E would have crapped all over this design because they'd assume you'd export all solar and ESS to the grid during peak time. Lucky you're in SoCal.
PS. before you approve this design, see if they can replace the conductors with the (8) circle to #8 AWG instead of #10 AWG. @h2ofun would be pleased.
Tesla is just doing their diligence showing your home's expected ability to draw power falls well below the threshold of the systems being installed can handle.
So assuming your hot water heater, furnace, kitchen oven, and kitchen cooktop all use natural gas... and you have no pool pump, hot tub, EV, or grow-house, then I think what Tesla is proposing is good. I'm amazed you were able to use so much power to warrant such a large system even though your house has so many gas appliances. But if this is the system you want, it'll definitely provide you with a ton of clean energy and your home's ability to use electricity is very well protected.
By the way, You really don't need to upsize those conductors between the Powerwalls and the Tesla gateway. There's just another thread on this site where people are all excited some Tweets from Elon... and larger conductors may help in anticipation of those Tweets becoming reality.
One last thing... I guess some people on the forum (myself included) may tell you that you should consider switching some appliances to use electricity instead of natural gas first. Because trying to make changes after Tesla installs stuff may be difficult due to how they label things and other electricians often do not like to touch systems that are protected behind a whole home battery backup. In my case, trying to add an EV charger after getting solar and batteries became more of a hassle than I realized. But such decisions could set you back weeks/months on your solar and battery installation.
Yes, we have gas water heater, clothes dryer, furnace, kitchen oven, and kitchen cooktop. We may add a vehicle charger in the future.