Yes.. delivery is probably 20 grand.
Regarding the BMS, I think a decent 48 volt solar charger with enough panels and a high amp Bms could balance these over night without mega expense, what issues were you thinking of with the potential for spending 800 on a bms?
You should so some research on BMSs for solar. I'd be pretty sure that they're substantially different to ebike ones.
The problem is the balancing. 100mA bleed currents are OK for a 4P cell-pack, but, even for an ebike battery, you're going to need something substantial for 38P.
An ebike BMS with top-balancing is not going to work because ebike batteries are charged and discharged, and the balancing happens at the top end of each charge cycle on the basis of a little and often, while as your battery will spend much of the time held at maximum voltage.
Also, you'll probably want to keep your pack below the voltage at which top balancing occurs otherwise it won't live very long. I'm not an expert on lithium batteries for solar, but I'd say that you'd want to use a maximum of something like 4.05 to 4.1 volts per cell compared with 4.2 for an ebike, where the balancing happens somewhere above 4.15v.
Check out the Electrodacus. It combines a charge controller with BMS up to 7S and 40 amps. There are probably similar products that can cope with larger installations.