You must be looking at the same situation I had when replacing a Xantrex MSW with a 2000 watt Xantrex PSW. Seems the MSW was made specifically for rv and had 2- 15 amp breakers built in. They don't make the PSW this way. I had enough room so I mounted a Square D box with two 15 amp breakers next to the new inverter.
The idea is to protect 14 ga. wiring down the line.
You could install two inline fuse holders with a supply of 15 amp fuses nearby. They would take up a lot less space and still protect the wiring down the line.
