AC200P to Fusebox, Calculate Breaker Size

Product Discussion BLUETTI AC Series
1

Hi,

I have a Bluettit AC200P, which I will use in a campervan.
I’ll hook up the 12V/25 Amps outlet to a fusebox, which will then power the components. To protect the cables and the fusebox, I’ll install a breaker, but I need help calculating the breaker size that I will put between the AC200P and the fusebox.

Below are the parts as I will install them.

  • Bluetti AC200P (12V/25 Amps outlet)
  • The cable from Bluetti is 12 AWG (~3.3mm²) (less than 1m (3 feet)).
  • BREAKER AMPS?
  • a 4mm² cable (~11AWG) (less than 1m (3feet)).
  • The fusebox is 30 Amps

If you need 80% from the lowest component (25 Amps power outlet), I should get a 20 Amps breaker. Is this correct? (won’t that shut off the circuit constantly?)

Thanks for helping me out.

Kind Regards

2

Hi,

this depends primarily on the maximum temperature and how well the cable can cool down. Up to 60°C is normally expected in the vehicle.
12AWG is slightly less than 4 mm², so I would definitely fuse below 16A …

diameter [mm²] max. current [A] at 30 °C max. current [A] at 60 °C
2,5 32 16
4 42 21
6 54 27
10 73 36.5