Yes,the following is the calculation method of fuse ampere.
Continuous power of the inverter ÷ Lowest input voltage =Fuse ampere ,e.g.
3000W 12VDC version: recommed a 300Amp fuse (3000W÷10VDC=300Amp)
3000W 24VDC version: recommed a 150Amp fuse (3000W÷20VDC=150Amp)
3000W 36VDC version: recommed a 100Amp fuse (3000W÷30VDC=100Amp)
3000W 48VDC version: recommed  a 75Amp fuse (3000W÷40VDC=75Amp)