Help with fitting a Sterling Alternator battery charger

[wolfbus.uk]

I am trying to install a Sterling Alternator ~ Battery charger AB12160 into my van. The charger is rated at 160A and I have a 90amp alternator.
Have looked on the Sterling installation guide but it is still quite confusing so below is a link to a basic wiring diagram for my installation, could someone perhaps
tell me if it looks correct?


https://www.flickr.com/photos/134122268" onclick="window.open(this.href);return false; ... ed-public/

Also, how many shunts would this this set up need, with 2 fuse boxes at front and rear of van.
Also should I be using 35mm2 (or possible 25mm2? )wire for the fittings from alternator up to the Sterling and to battery banks, and then 15mm2 wire for the connections from batteries to fuse box.The loads on each fusebox will be under 20A.

Any advice much appreciated

[wolfbus.uk]

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another attempt at the drawing, with repositioned master switch and fuses