The size of the inline fuse you should use when installing a 2000 watt inverter in your rig depends on the maximum current draw of the inverter. To calculate the maximum current draw, divide the inverter's rated power (in watts) by its input voltage (in volts). For a 2000 watt inverter with a 12 volt input, the maximum current draw would be 2000 watts / 12 volts = 166.67 amps.
As a general rule, you should use a fuse that is rated for about 125% of the maximum current draw. In this case, you would need a fuse rated for at least 166.67 amps x 125% = 208.34 amps. The next highest standard fuse rating is 225 amps, so you should use a 225 amp fuse when installing a 2000 watt inverter in your rig.
