Are you really trying to say that the battery pack wouldn't be priced lower if the PCS wasn't included?
Presuming they don't change the physical design to make the installation process different, it might not be priced lower (just like how Tesla wouldn't necessarily charge less for a car with a pack that had the true lower capacity vs the one with a software lock).
Basically ease of manufacturing/service is worth money to Tesla. Plus in this case, comparing the two scenarios:
1) pack is swapped with a refurb pack with PCS; old pack is taken to refurbish with PCS included, rinse and repeat
2) replacement pack comes without PCS, extra labor is spent transferring PCS to replacement pack, old pack doesn't have PCS when they refurb it
The latter may actually cost Tesla more money because of tying up the technician to transfer the PCS everytime (even if they bill for the labor, which the owner may not be happy about because they are being billed for "unnecessary" work).
The only case where they actually paid extra for the PCS is when they sell you a new pack with a new PCS, but then when they use that to swap with your old pack, they get a PCS back, which as above makes them more efficient.
As mentioned, the only thing that trips this process up is when owner insists on keeping their old pack or their PCS or if their PCS is broken. But I imagine that is a relatively rare case.
teslamotorsclub.com
