... similar function as the GTIP series solar controller, but with modifications function. GTIP20-LT Solar Controller (NEW)GTIP20-LTIt provides similar function ... as the GTIP series solar controller, but with modifications function. The symbols on LCD offers better ... : Rated Voltage(for PV and load): 12 Volt or 12/24 Volt auto workRated Current(for PV and load): 10, 15 ...