Hi Folks,
Due to the way my vehicle is set up the only place I can install my Charger 1 is under the passenger seat, then run a custom made Output cable terminating in an XT60 plug to the rear of the van to supply my AC70, (about 3m)
I was wondering if there is a minimum specification for the Output Cable ?
The supplied output cable with the solar connectors is woefully short and the cable seems to be very small section I guess to be around 1mm -16A.
The answer to your Q is variable as it depends on what you set the output of the Charger 1 to. However if you work on its max output of Watts =560 and made up of 56V @ 10A you then need to calculate voltage drop over the distance of 3M. i.e.
Using 14AWG (2.5mm sq) cable will give less than 1% V drop which is good. (At these voltages less than 3% is ok).
My choice would be 12AWG as it is a better fit re the C1 terminals and MC4 connectors and less drop than 14AWG. There are numerous online calculators to calculate this info. 
Hope this helps
Forgot to mention - If your cable is at this length, I suggest you put an inline 15A fuse near the C1 in the positive line. This will protect the cable over your planned routing.
Hi Mandp,
Many Thanks for the excellent reply,
So basically if I use a 12AWG cable which is rated at 20 amps and put a 15Amp fuse on the Positive near the Charger 1 and terminate the AC70 end with an XT60 connector everything should be fine ?
Can I bypass the supplied Output cable with the MC4 solar connectors and just terminate the new cable directly into the Charger 1 Output Terminals ?
The output cable of Charger1 uses 14AWG wire . If you need an extension, we recommend upgrading to a thicker 12AWG cable.