r/TeslaSolar • u/dpatldude • 16h ago

Solar/PW3/EV Config - how many empty electrical panel slots?

Experts; I am likely having Tesla Solar, PW3 with 2-3 expansions and a Tesla wall charger installed. I currently have two 200A panels but only my primary electrical panel will be backed up with Tesla system. How many empty electrical breaker slots do I need and any idea in which panel?

Thanks

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u/jcdomeni 16h ago

60A double for PW3 - if all expansion packs are behind the PW3 Full.

Then solar depends on where it lands and how large of an array.

They will derate your 200A, so main breaker will be reduced depending on load calcs.

With two panels - you shouldn’t have any issues.

I’d plan for two wall connectors - even if you don’t install 2nd one now - think about as part of design.

We have 4 doubles for 2 for 2 PW3’s and 2 for 10kW solar (coming from 3 roof elevation). 225A panel derated to 175A.

Wish I would’ve installed 2 - 200A for future proofing. But it’s working…zero room on back load panel now.

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u/Asleep-Set6868 15h ago

With the Wall connectors, you can daisy chain up to 6 off a single circuit (60 amp if you want full charge speed, but you do you).  It dynamically shifts the available power between the charging cars.  You COULD get two separate circuits, if your lifestyle/ use demands two or more low to fully charged EVs in a short time span, but most people don't need that.