SUBF2030 is an External Battery Frame for use with select Tripp Lite SmartOnline 20kVA and 30kVA UPS Systems (SU20K3/3, SU20K3/3XR5, SU30K3/3 and SU30K3/3XR5). External Battery Frame supports the installation of up to four SURBC2030 Internal Battery Packs (available separately from Tripp Lite). Modular DC connector enables daisychaining of multiple SUBF2030 External Battery Frames for extended runtime.