Your shore power is 30amps at 120volts. When that goes through your PD convertor, 120volts/30amp becomes 12 volts 300 amps. 3 0 0 Whic
Your shore power is 30amps at 120volts. When that goes through your PD convertor, 120volts/30amp becomes 12 volts 300 amps. 3 0 0 Which is why DC wiring is HUGE. I see other problems in your sketch. You need a 300amp fuse to protect your battery and it goes between the battery and bus bar. Please read this guys blog https://www.explorist.life/2000w-520w-60a-budget-friendly-camper-wiring-diagram/
also search youtube for his explorist life victron videos (still worth watching even if you don’t use victron). buy the plan in the blog link above for $10 here https://shop.explorist.lifeHe does a nice job in his diagrams because he also tells you what size wire you need.
Also your right-most 6 circuit blue sea fuse block will have to be the one with a negative bus bar. There’s a 6 circuit without, make sure you get the right one. but the 6 circuit can handle 100amps at 12v, so the breaker on that one should be bigger than 30amp. But I learned so much reading the links above and watching his videos. (I’m not him I swear). It’s just a great resource.