Other than picking the size of the panel, the actual connections are really very simple.
I used 2 wire nuts to make the connections from the solar panel
to the controller (you may need to remove a little more isolation from the red and black panel wires in order to twist the copper together before twisting on the wire nut).
Then, I used 2 wing nuts to attach the ring connectors on the battery
end of the controller to the threaded battery
The instructions in the controller are fairly clear.
Note that all panel's rated wattage are for optimum directional conditions in full sun. I think that the crystalline panels may do a little better in suboptimal conditions than amorphous panels that require larger size panels. Someone else may comment on that.
The 35 watt panel will provide slightly less than 3 amps in full sun. That is slightly more than the 2 amp low setting of my home car charger.
With my limited current usage, all I really needed was the .7 amps provided by my 12 watt panel.
As Floyd said, a group 27 battery
will last a while on its own. If you are even trickle charging, you will extend that even farther. If you are trying to run microwave
ovens and flat screen TVS, you would probably need multiple batteries and multiple larger wattage panels.
As I said, YMMV. 😉
Good luck! ☺
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