question

I think it depends on your cable size to your inverter and panel voltage.

I have 10 x 200watt panels at 36v each.

Have connected them so they supply 72volts to my inverter thus needing not so big a cable. My length is about 8 meters.

I'm in West Australia and am fully charged by 10am every day.

I too am offgrid and have a generator option in case I run out if power. Never used it yet in 25 years. It runs to the fuse box where I have a isolator switch to protect power going into the inverter when generator is on. That part was installed by an electrician who knew his stuff.

You should also have a switch between solar panels and inverter. Best to have it off when you switch on the inverter. Also good for when you have to work on the system.

Almost certainly you need a series/parallel setup for the panels. If you exceed the input limit of 150V on your controller, it will be broken, probably unrepairable. Get all the panel specs, then Google the Victron MPPT calculator for help on setup.

Multiplus and controller connect direct to the batteries using correct sized cables and ideally busbars. You'll need to assess loads to determine cable sizes. DC loads connect to the busbars as well through DC fuse boxes. You'll also need to add a solar isolator per string and solar fuses if you have 3 panels in each string. Use the correct solar cable to connect the panels.

AC input from the generator goes as you say, but might need expert help to get it working.

AC output from the multiplus goes to a standard consumer unit/distribution board.

You'll need to set the battery parameters correctly in the multiplus and solar controller.

Manuals van be downloaded from Victronenergy.com. You might need to look under older products for the controller manual.

Make sure you comply with local regulations and at least get the AC side checked by a qualified electrician for safety.

If you are feeding your Multi from a generator you should make sure both are earthed in accordance with local regulations. Some advice in Wiring Unlimited but requirements vary a lot from country to country.

Thank you for sharing, i think i got it now!