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Bob:
I suspect the Gopower is a PWM controller and a MPPT one like the Victron will provide 15% or so more power. You should just connect the wires from the solar panels to the input and the wires to the battery to the output.
The prewiring to the panels can be 12 to 10 gauge and if you have a two or four 12V nominal panels consider wiring them in series as discussed in the article. The prewiring to the batteries should be at least 10 gauge. If you have 2-100 watt panels, there will be a voltage drop of about 0.3 volts if the batteries are within 10 feet and is 10 gauge which is marginal. Definitely increase this wire size if you have more than 200 watts of panels.
Here is a brief article on selecting and installing a solar controller attached.
David
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