Products which their power are less than 500W, like lamp, 29" TV, sounder, charger, ... , fanner, etc. Item No AH-PI500Item Name Power InverterSpecificationsApplying area: Products which their power are less than 500W, like lamp, 29" TV ... (on/off), just moving the high loads, the inverter can restart automatically. So there is no need to place the spare fuse.