Tesla Powershare Install, why add an extra load center and why so big?

[Tanquen]

This is the diagram from Tesla.

The existing load center has 14 spaces and 6 are already doubled up. The bottom 4 spaces are for the 20A to the garage and a 30A for a wall heater. If the wall heater could go up top with the dryer in a 30A quad breaker that would leave 4 spaces at the bottom.

They may already be doing this to get the second 125A breaker that goes out to the gateway. I still do not know why the new load center 'C' is needed.

It seems like you could have the new 125A breaker that takes the utility power from the exiting 125A main breaker then goes out to the gateway in spaces 11-12. Then the power would come right back in from the gateway to power the existing breakers in the existing load center. The 60A breaker shown in new load center 'C' could go in spaces 13-14 and then out to the garage.

I asked for the make, model and or dimensions of the gateway and the two new 125A load centers? They did not tell me the size of the gateway but did tell me the part numbers for the two new load centers and they seem to be overkill for just a few breakers in each.

Load center, Homeline, 1 phase, 24 spaces, 48 circuits, 125A convertible main lugs, PoN, NEMA3R
Load center, Homeline, 1 phase, 12 spaces, 24 circuits, 125A convertible main lugs, PoN, NEMA3R

They are both for outdoor use and seem way too big. I guess the smaller one should be for the garage but it will not fit or they are planning to surface mount it?

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[Crissa]

Well, the box itself won't cost alot more to have more spaces in it. At least, it shouldn't.

Your existing breaker panel seems... Tiny.

-Crissa

 

[Tanquen]

They are installing a new load center 'C' with 24 spaces and only using two?

Maybe is the exiting breakers are being moved over to it? That would be a lot of work and it don't seem like it as they have a line going out of 'C' "To (Existing) Loads".

Like they are bypassing the utility power from the meter and sending it out the existing load center, to the Gateway, then right back in to the existing load center power the existing loads.

Not sure of the Gateways size but I don't think it and this new panel can fit on the side of the house and meet the NEC Workspace code.

 

[flyinglow]

Typically, the extra load center is for isolating the circuits that are backed up. CT will send a max 11.5 kW/47.5A @ 240V to the house which may not be sufficient for all house loads so critical loads are moved to the new, back-up load center.

 

[Tanquen]

Typically, the extra load center is for isolating the circuits that are backed up. CT will send a max 11.5 kW/47.5A @ 240V to the house which may not be sufficient for all house loads so critical loads are moved to the new, back-up load center.

They said everything will be backed up but they also said it could go under the stairs.
The I'm talking to is knowable to a point and others are creating drawings and such.

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