Russell, thanks. I'm not doing it myself, I'm getting an electrician to do it all. Brett, thanks. Yes, AS/NZS 5033 will apply. I'll see if I can bring the distance down below 50m by dropping three trees instead of nine. AS/NZS 5033:2014 is alleged to also require maximum voltage drop of 3%, and maximum Voc of 600V unless access restriction is added. https://www.gses.com.au/wp-content/uploads/2016/03/5033-2014-Changes.pdf (Access to standards is an irritation for me; used to be able to get at them through public library, but the library lost access. My own business isn't yet able to justify the expense of formal access; mostly I'm doing software and firmware.) Dwayne, thanks. The trees are shade for garden walks in summer (45=B0C), habitat for some fascinating birds, and wind protection during the northerly (from equator) gales and dust storms. Tallest five trees at about 30m height. On the other hand, removing them would increase the winter solar thermal input of the house windows. ;-) I've been reading technical training and specifications of the gear, and had a couple of theories; 1. longer cable means larger voltage drop, that adding a panel brings the total power above the maximum array power of the inverter charger. But if that is the case then it should be accepted because of the voltage drop. And the input will be MPPT anyway. 2. adding a panel brings Voc above 600V requiring access restrictions. --=20 James Cameron http://quozl.netrek.org/ --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .