Solar Install

There is nothing to "renew" with solar modules. The solar cells are encapsulated so either work properly or don't. You can test them by measuring (with your clamp on multimeter set on dc amps)  how much current the module supplies to the battery on a perfectly clear day when they are pointed directly at the sun. To be sure they're pointed at the sun you can place a stick or bar perpendicular to the surface and it should cast no shadow. Look up the spec for max power current (aka the Imp) of the module, you should be getting pretty close to that number. 

That link does not appear to include a battery charge controiler so you will still need that.

 The other thing you can do is check your local craigslist for left over residential (about 250 watts) or industrial (about 350 watts) modules. You can often get those for 50 cents a watt or so.  You will need an MPPT type charge controller for them because they run at too high a voltage to charge 12V batteries directly. 

I am just scared of cutting into the wall!!!!

Any advice or direction would be helpful. Go Power does not have any instructions and today I chatted with someone who just said, "Connect this and that and cut a hole and wellah!" Uh huh.