If the total was about 535Wh/day then yes, at 12V it is about 44Ah/day. But that's just the DC loads. Have you worked out how many watt hours your AC loads will be? If you haven't done a full energy audit then please see the following:

To get the spreadsheet, click on the orange button at the top of this page. This sheet is intended to help you plan your system. Fill it out down to the last decimal place, look at the results..... and then make your best guess;) Notes...

diysolarforum.com

At your suggestion I completed the energy audit being sure to include both AC and DC loads.

System size calculations | | |

Full Load W-hrs. | 1222.5 | W-Hrs. |

Full Load Watts | 1140 | Watts |

AC Watts | 1050 | Watts |

AC Surge wattage | 0 | Watts |

AC Watt-Hrs | 612.5 | W-Hrs. |

DC Watts | 90 | Watts |

DC Watt-Hrs | 610 | W-Hrs. |

Inverter Sizing | | |

Inverter efficiency | 85.00% | % |

Min continuous Inverter size | | Watts |

Min Surge Inverter size (Input Watts) | 1235 | Watts |

Battery Sizing | | |

Daily Storage Requirement | 1331 | W-Hrs/Day |

Max discharge from full CHARGE | 85.0% | % |

# days of storage capacity | 1.5 | Days |

System Voltage | 12.0 | Volts |

min Battery capacity W-Hrs | 2348.1 | W-Hrs. |

min Battery capacity A-Hrs | 195.7 | Amp Hours |

Max continuous current to DC Loads | 7.5 | |

Max continuous DC current to Inverter | 0.0 | |

Max continuous current from bat. | 7.5 | Amps |

Max Continuous discharge rate | 0.04 | C |

I want to point out that mt AC loads are from a coffee maker 700W and rice cooker 350W. Coffee maker could be used daily. rice cooker maybe a couple of times per week.

This system also has no solar, perhaps at a later date but only room on the van roof for a single 100W panel so will relay on charging when driving for now.

Reading all posts from this thread I noticed in post #2 you stated

"If each BMS can only handle 100A then it would be prudent to put a 125A on each battery in addition to the 175A main battery fuse. If each BMS can handle 200A then there is no reason to fuse each of the two batteries. The one main fuse would be enough since each battery can handle the full max load".

Confirmed SOK battery spec "maximum continuous discharge current 100A".

following your suggestion to include a 125A fuse at each of the two batteries, would a battery post mounted BRMF fuse kit mounted to each battery be acceptable or better to you a MEGA or ANL fuse? Can you please explain the rational for adding these fuses?

With the above information from the energy audit would I still be able to use 1/0 wiring (2/0 even better if I wanted) and a 175A main battery fuse?

Anything else that needs to be considered?