ROI Solar Roof Mounting System owns core technologies of BMS, inverters and lithium battery manufacturing. It supports expandable capacity, free combination and 15-fold safety protection, easy to install with long lifespan, compatible with 20 mainstream inverter brands. Three LFP models (1.1kWh,4.6kWh,14.3kWh) support multi charging modes including PV, mains and car charging, with diversified AC/DC/USB/Type-C outputs and APP control. Rol Technology offers premium PV pre-sales service and global PV technical training platform.