Hey Matt.
I have a 10 amp controller I purchased on ebay, same as ebay item 360640504344 . I have not used it yet. I paid about $10 delivered.
My camper has an adsorption fridge that when on 12v uses about 60w ~ 5 amps.
The camper has LED lighting & a small electric water pump. It also has a 600w inverter that doesnt get much use. I am looking for a very small micro wave oven.
I have a 86 size lead acid battery in the camper.
Last year I got a 130w mono crystalline solar panel off ebay, same as item 350909343856 . I paid about $1 per watt for it.
Its been used a few times now. When camping its ok to just move the solar panel during the day so that it always gets maximum sun. Only during the middle of the day with no cloud do you get the full 130w out of it. Have been told that this is the case for all solar panels, rated power only occurs during the middle of a sunny day.
I have found that with the size of the battery it doesnt get into an over charge situation & so I have not seen the need for the controller. I have a multi meter & have kept an eye on the voltage of the battery.
If I had my time over again I would have probably got a 250w panel. That way on cloudy days there would still be adequate power production.
While traveling I have the battery/fridge connected to the car via an Anderson plug. As the camper battery is of the same type of lead acid I dont appear to need an electronic box between them. When stopped, its just easy to unplug the lead from the car & let the camper battery keep the fridge going.
My system is a far cry from what many will recommend, it has worked well for me.
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