My oringnal design uterlised relays in place of the P channel
Found it difficult to source a 5v relay that can switch 48v DC
I crudely parraled up 2 relay contacts get gain larger contact area and seems ok although I'm unsure what life I will get out of the contacts
I used the N channel to switch off the current before opening or closing relay contacts to help
So decided on redesign using mosfets
Also I'm assuming the internal mosfet diodes will cope and deal with the back emf from the coil ?