A 50w panel can just barely offset the 24/7 'phantom' loads like USB ports, propane detectors, fridge electronics, etc. There is not much left over for your devices like phone chargers, laptops etc.

Keep in mind that cloudy days and/or shade will decrease the output dramatically.

We use a 25’ RV 30 amp extension cord to connect the panel to a 30 rv  outlet on the side of the pod. The wiring goes from that outlet directly to the controller and then to the batteries. We used large guage wire in short runs to minimize voltage loss.

There is a post of our installation that can be found in the search function.it is a couple of years old, so extend the search function time limits.  That installation was in our 173.  We have sold that unit and currently have the panel system installed in our 179 with a few changes.

Hope this helps you

Vann

Vann

Start with a fully charged battery, then go camping for a few days using your electrical devices as you normally would, but don't connect any charging sources. Wait until your battery is roughly around 50% discharged as indicated by the little panel lights. Then, disconnect the batteries from everything and let them rest a couple of hours.

Measure the battery voltage and use a table like the one in this article to determine state of charge. For example, at rest a deep cycle lead acid battery should be around 12.0-2.1V when at 50% SOC. 

Say you have a 200 amphour GC battery bank and you're at 50% SOC after 2 days. You are consuming about 0.5*200/2= 50 amphours per day. So now you know your consumption rate, at least for the particular conditions you encountered in those 2 days. 

Next, say you want to go 6 days before you move camp and can fully recharge you battery from your tow vehicle while moving to your next spot. You will need 50*6=300AH. You will start with 100 useable AH in the battery because you don't want to go below 50% SOC. So, you need to replenish 300-100=200AH in 6 days. You will need 33AH daily on average from your solar system to do that. You'll probably want to also have an alternative backup charging source like a genny or your tow vehicle if you get a run of cloudy days or are camped under trees. You can see that if you plan on moving camp every 2 days you wouldn't really need any soalr charging. 

Most places in the summer in north america will get at least 4 hours of full sun equivalent per day on a tilted south facing surface that's unshaded. So, you'll need about 33/4=8.25 amps of solar charging. Solar modules run at about 18V so that's 8.25*18=148 watts of solar. 

YMMV.