The configurator website is down. Just in case anyone wants, these are the only 2 screen shots I took trying to figure out why the SL was so much more than the SV.
https://imgur.com/gallery/2WMY3
There's a $4k price difference between the SV and SL, both fully optioned. So a bigger battery is the only thing that's making sense to me too. Price wise, it would be on par with the Bolt and Model 3 in terms of price/battery size.