question

Ideally you should use one balancer per string, but you can also interconnect all midpoints.

You should check fusing and wire sizes in the balancer manual, my gut-feeling would go to 6sqmm with 30a fuses.

Look into the manual/datasheet the balancer is balancing with max. 1A, so a 1,5mm² should be enough.

I'm using just the one I have for now but will eventually get a balancer for each string.

I have a power in bus bar, I guess the positive and negative from the balancer can go straight to the bars yes?

Do I fuse 30A close to the positive bus bar?

Mid point of course I just interconnect all the negatives in the middle all the way down to last string.

Something like this for the fuse could do?

https://www.ebay.com.au/itm/384781537186?hash=item5996c44fa2:g:uzgAAOSwFK1fZWzJ&amdata=enc%3AAQAHAAAA8EQt3unERtOf2a%2FPIy2l1Kg1NZ459leLNNWuSF%2FzsCmdGLmyRNjCptRIodBO3mUn%2FyIdWJLL2Ilbx8HfA8cx8ArO93WzyDRdMsSKmyN%2B%2FWRL%2BxgjpbPXBZju28Hu6AoQcayisnR3b7AyAUW9tlk4p0HaDcMy5%2BHcBNSLB%2BQdO91kHPDMsdS4zC5ctyOFkWuGv34kJAjRJuYUM1VtpIKMLabDdiy6j%2FO%2BuGQ7swkcJJacJdH8oYIuVM%2F3mtLpw87vYmzg9u%2BZZ5kH1L7dC1gITMzKb7691zPQRV7E8Vkhs63iuL%2By1KurrL8Aqq0pVAY6Fg%3D%3D%7Ctkp%3ABFBM2KD_zvZg

I like the idea to have it on a breaker if needed to be turned off.

Thanks for your time champs

Do I need to fuse in between each string in the mid point or just one fuse on the positive to bus bar?

I'm still confused on where the fuse go and if I could do without