I'd put it this way:
Panasonic is going to extend Gigafactory cell manufacturing capacity up to an about 12,200 packs/week rate by the end of 2018, when measured in
Standard Range battery packs.
The LR/SR mix is unknown at this point, and clearly Tesla did not expect such high demand for the LR version - and is, as we all are (including Panasonic), pleasantly surprised about it.
Eventually they'll reach steady state:
- If the long-term take rate between SR and LR is going to be a 50%/50% then the Gigafactory output of 35 GWh at the end of 2018 is going to be enough for about 9,950/week Model 3 battery packs,
- a split of 60%/40% of SR/LR will shift output to about 10,325/week,
- a split of 70%/30% makes it 10,740/week, etc.
I believe those calculations are roughly what Tesla made back in 2016 when they planned for 35 GWh output - but neither they, nor we can know what exact options mix consumers are going to opt for.
As for the Powerwall/Powerpack assembly line that was re-purposed to make Model 3 battery modules: once the new Grohmann machines are installed in the next 1-2 months this line can make Storage/Energy products again, to utilize any cell output that isn't used to make Model 3's. The introduction of the Standard Range version will reduce the average battery usage of every Model 3, so there should be more cell output by that time at the latest.
Until then, higher than expected demand for the Long Range version of the Model 3 is going to tie up Gigafactory output.
BTW., I'd not be surprised that once Tesla hits 6k-8k packs/week output that Panasonic would add
another three lines in the first half of 2019, to extend from 35 GWh to 43 GWh, and then another 3 lines to get to ~50 GWh. There's
clearly enough growth potential on the Storage/Energy side, plus there's the 2170 use of the Model S/X refresh that could happen in late 2019 ...
We learned these Gigafactory capacity and expansion details shortly before The Tweet, and I'm not sure whether the (positive) implications are fully priced in yet.