By using these MC4 combiners here you can run 3 panels (or 3 strings of panels) in parallel.
You get a pair of connectors: One (1)Male to (3)Female and one (1)Female to (3)Male for running 3 strings of panels input to 3 strings of panels output.
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anti-aging and resistance to ultraviolet radiation
Cable length for each side:350mm
1. Cable Standard: 4.0mm sq (12AWG)
Rated current: 30A
Rated voltage: 1000V DC
Test voltage: 6000V(50Hz,1 min)
Contact material: Copper,tin plated
Insulation material: PPO
Degree of protection: IP67
Satety class: II