Cable size for solar connection

DIY
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1

I have purchased the SmartSolar MPPT Solar Charge Controller 100/15, but whilst I wait for its arrival I was wondering what size of cable from the 200W solar panel I have, should I use. Is it 4mm2 or 6mm2. Any help would be most useful. Thank you.

2

For a 200 W module, as long as the cable length (i.e. the positive and negative cables combined) isn’t excessively long, 4 mm² is more than sufficient.

3

Thank you Jetlag. The length of cables from solar panel to MPPT is approximately 9ft - 10ft each one, would that be too long? Mike.

5
6

For that length, 4 mm² is more than sufficient.