Has anyone added circuits to their Tesla Solar whole-home setup - how did it work? How long did it take?
I'm doing a whole-house backup (with the Backup Switch/meter collar, no Gateway). The system is bigger than we need now (8.5 kW, Powerwall+, Powerwall 2.1) specifically to be ready for electrification of more of the house over the next couple years (e.g., electric water heater, clothes dryer, induction cooktop). And, near-term I want to rework some of the house circuits (e.g., split the kitchen circuits to provide dedicated lines for the major appliances, add AFCI/GFCI breakers etc. So I need to understand if there is something I can/should do now to enable later growth/improvements.
The house was built in 1968. The existing Main Panel is an old 100A Murray which is already stuffed with tandem breakers ... no slots, no circuits space left, AFAICT. That panel is located right next to the gas riser so PG&E won't let me enlarge it or upgrade to 200A in any sane timeframe (they're talking 6 months to a year, and many thousands of dollars, because my service feed is direct-buried cable).
Tesla will use a Backup Switch (meter collar thing), and apparently just splice and extend every circuit from my outside Main Panel... the extensions will be about 50ft, where they land in a new "Building Load Center" panel in the garage, which is where the two Powerwalls hook up. The Main Panel will just have an 80A breaker cabled (AWG #4 THWN-2) to the busbar of the new BLC panel (no input breaker on the BLC's utility feed).
The Main panel gets labeled telling us to not have breakers adding up to more than the busbar's ampacity (100A, think) so after the 80A breaker there's maybe physical/electrical room for one 20A breaker in that box.
The Powerwall+ will have a 50A/2P breaker in the BLC, and the Powerwall2.1 will have a 30A/2P breaker in the BLC. The circuits to be relocated comprise 13 of 120V 20A (mostly intermittent loads - there's the refrigerator, and a 20 year old spa/hot tub which circulate/heats continuously), 6 of 15A, one 30A/2P (unused dryer), one 40A/2P (electric oven), so the new Building Load Center panel will have like 28 spaces taken up. (None of the existing breakers have AFCI or GFCI functions, so fixing that is a big part of my goals here.)
I'm assuming Tesla will install a panel with some extra spaces. (Their first plan says a 20-space/40-circuit 225A panel, and I'm trying to get my Tesla Adviser to understand that's physically too small.)
I figured new circuits could be added to the new BLC panel, after the install. (I want to restructure the kitchen circuits, for example - not new stuff, just dedicate some circuits to specific appliances.) If they're heavy loads (like, if we ever added an electric dryer or a minisplit heat pump) we'd just know to not use that during a power outage. My main concern was whether the 80A breaker between the Main Panel and the BLC was going to be enough power for the house (I haven't seen any load calculations, but our usage runs around 22 to 24 kWh/day throughout the year, and our *peak* daily load was about 30 kWh, so I'm feeling like we're probably OK.)
But, I just learned (from "construction drawings" that) that the new the panel will have a sticker "CAUTION ADD NO NEW LOADS" - so where do new loads (e.g., water heater) or new circuits (e.g., dedicated refrigerator) go? I've read in a couple threads you have to go back to Tesla to get a confirmation the new load won't "void your warranty." Has anyone actually done that? How long does it take, does it cost anything?
Bottom line, is a Tesla PV+ESS going to freeze my home configuration and make it impractical to update some safety issues or expand electrical use?
I'm doing a whole-house backup (with the Backup Switch/meter collar, no Gateway). The system is bigger than we need now (8.5 kW, Powerwall+, Powerwall 2.1) specifically to be ready for electrification of more of the house over the next couple years (e.g., electric water heater, clothes dryer, induction cooktop). And, near-term I want to rework some of the house circuits (e.g., split the kitchen circuits to provide dedicated lines for the major appliances, add AFCI/GFCI breakers etc. So I need to understand if there is something I can/should do now to enable later growth/improvements.
The house was built in 1968. The existing Main Panel is an old 100A Murray which is already stuffed with tandem breakers ... no slots, no circuits space left, AFAICT. That panel is located right next to the gas riser so PG&E won't let me enlarge it or upgrade to 200A in any sane timeframe (they're talking 6 months to a year, and many thousands of dollars, because my service feed is direct-buried cable).
Tesla will use a Backup Switch (meter collar thing), and apparently just splice and extend every circuit from my outside Main Panel... the extensions will be about 50ft, where they land in a new "Building Load Center" panel in the garage, which is where the two Powerwalls hook up. The Main Panel will just have an 80A breaker cabled (AWG #4 THWN-2) to the busbar of the new BLC panel (no input breaker on the BLC's utility feed).
The Main panel gets labeled telling us to not have breakers adding up to more than the busbar's ampacity (100A, think) so after the 80A breaker there's maybe physical/electrical room for one 20A breaker in that box.
The Powerwall+ will have a 50A/2P breaker in the BLC, and the Powerwall2.1 will have a 30A/2P breaker in the BLC. The circuits to be relocated comprise 13 of 120V 20A (mostly intermittent loads - there's the refrigerator, and a 20 year old spa/hot tub which circulate/heats continuously), 6 of 15A, one 30A/2P (unused dryer), one 40A/2P (electric oven), so the new Building Load Center panel will have like 28 spaces taken up. (None of the existing breakers have AFCI or GFCI functions, so fixing that is a big part of my goals here.)
I'm assuming Tesla will install a panel with some extra spaces. (Their first plan says a 20-space/40-circuit 225A panel, and I'm trying to get my Tesla Adviser to understand that's physically too small.)
I figured new circuits could be added to the new BLC panel, after the install. (I want to restructure the kitchen circuits, for example - not new stuff, just dedicate some circuits to specific appliances.) If they're heavy loads (like, if we ever added an electric dryer or a minisplit heat pump) we'd just know to not use that during a power outage. My main concern was whether the 80A breaker between the Main Panel and the BLC was going to be enough power for the house (I haven't seen any load calculations, but our usage runs around 22 to 24 kWh/day throughout the year, and our *peak* daily load was about 30 kWh, so I'm feeling like we're probably OK.)
But, I just learned (from "construction drawings" that) that the new the panel will have a sticker "CAUTION ADD NO NEW LOADS" - so where do new loads (e.g., water heater) or new circuits (e.g., dedicated refrigerator) go? I've read in a couple threads you have to go back to Tesla to get a confirmation the new load won't "void your warranty." Has anyone actually done that? How long does it take, does it cost anything?
Bottom line, is a Tesla PV+ESS going to freeze my home configuration and make it impractical to update some safety issues or expand electrical use?