Price 3234 $usd includes: 1set Master BMS, model# RBMS07-S20125A864V 18units 15S Slave BMU model#BMU07-15S8T48F 18sets 15S Wire Harness NXP high-performance chips. IP/TCP LAN, RS485, CAN commnication ports optional, strong compitability with PCS, INVERTER, UPS, hardware and software products have undergone 12 years of R & D and update iterations