It sounds like Volta is charging around $995, which often gets marked up by service dealers to nearly $1,500. This price is a deal.
For anyone that's adventurous and looking to use this on a non Volta build:
Pictures from the PDF manual are attached. In my van Volta only used this as an MPPT for charging from solar, as the alternator charging was done directly from a dedicated 48V DC alternator. It's also designed to charge a 48V battery from a 12V alternator, but if you've got a 48V battery you're probably going to have a dedicated alternator anyway. This charger is custom made by Kisae to Volta's specifications, which is a 14S NMC battery chemistry. It's one of the few MPPT chargers I've seen that has built in boost capabilities, meaning you can charge a nominal 48V battery from a nominal 12V solar panel. You probably could use it for a 16S LFP battery as the peak charging voltage would be 3.6375V per cell. It is limited to 10A inputs and 10A output, so it can peak to around 580W at the high end of the charging cycle. If you're going to use it for a non-Volta battery, be sure to read and understand everything in the manual before purchasing.