ITEM NAME:DC-DC Converter 20A 300W Step up Step down Boost Power Adjustable Charger Z a.imagelink a:hover.imagelink {color:#db3606;.Output Current: 20a (max.)., 15th (suggested). Efficiency: 95% (24 V to 12 V, 20a). 1x300 W 20a adjustable Constant Current Buck Converter Module of tension Reducer. The Buck has 2 Module Heat Sink could improve the heat dissipation.