Installation of Zamp Solar’s Sidewall Charge Port

Exterior 12 volt Solar Power Charge Port - Truck Camper Adventure

Interested in equipping your truck camper rig with a portable solar panel, but lack physical access to the batteries mounted inside your camper? Then you’ll want to take a look at this modification that provides this access via a 12 volt electrical charge port.

With the installation of a DC compressor refrigerator in my truck camper rig, I quickly discovered that my existing 240 watt solar power system was unable to keep my camper’s batteries charged, especially during the winter when running the furnace was necessary. A larger solar power system would be needed. Unfortunately, my rig lacked the requisite roof space needed for another 100 watt solar panel. Technically, I had the room, but mounting another panel on the roof would’ve left me with no room to perform topside maintenance. Because of this, I opted to get Renogy’s 100 watt monocrystalline solar power suitcase to get the extra wattage I needed. This high-quality unit comes not only with two 50 watt high-efficiency monocrystalline solar panels, but it also comes with its own 10 amp PWM charge controller and a padded carrying case.

While the lack of topside space played an important role in my final decision, what really solidified my choice were the benefits that a portable solar panel like Renogy’s solar suitcase offered. Not only can a portable panel be aimed directly at the sun, but it can also be tilted to optimize power output. This is especially useful during the winter months when the sun peaks at a lower point in the southern sky (yes, it’s true that tilting rooftop mounts can be purchased for RVs, but to my knowledge no rooftop mounts exist that can be aimed directly at the sun, an important consideration).

With this important decision behind me, next I had to find a way to access my batteries. Unlike most truck campers, which have the batteries mounted in an exterior compartment, the batteries in my Northstar Laredo are mounted inside the camper, underneath the dinette seat. I briefly considered installing a 12 volt charging station like the one offered by Palomino, but I wanted something smaller with just a simple socket or port to plug into. After looking at my options, I elected to go with Zamp Solar’s 2-prong sidewall socket. This 12 volt socket is small, polarized, and comes with its own weatherproof cover. There are actually several RV companies that use this socket as OEM. In fact, my old Wolf Creek 850 truck camper used this socket as part of its rooftop “solar ready” option.

Deciding where to mount the sidewall socket proved easy. The batteries are located towards the back of the camper and a small void underneath the wet bath is conveniently located between the battery compartment and the rear wall of the camper. The length of this void is only 2 feet, a wiring distance that afforded practically zero line loss for 16/2 AWG wire. In the event of an upgrade at some point in the future, I decided to upgrade this wiring using 12/2 AWG wire instead. Plastic conduit was used to protect the wiring run from the new socket to the battery compartment.

Exterior 12 volt Solar Power Charge Port - Truck Camper Adventure
A 3/4-inch hole saw was used to drill the hole for the 2-prong sidewall socket.
Exterior 12 volt Solar Power Charge Port - Truck Camper Adventure
The 12/2 AWG wiring was run underneath the wet bath through this void.
Lifeline 6 volt AGM Battery Compartment - Northstar Laredo SC - Truck Camper Adventure
The battery compartment is located underneath the dinette seat.
SAE Solar Power Plug 12 Volt
Closeup of the new sidewall socket with solar panel wires plugged in.
Renogy 100 Watt Solar Suitcase
My Renogy 100 watt Solar Power Suitcase in action.

Unfortunately, to install the socket I needed to drill a 3/4-inch hole in the back of the camper. I hated doing this, but it had to be done. In retrospect, drilling the hole wasn’t that bad and only took a few seconds to accomplish. I just had to make sure that I didn’t damage any of the PEX plumbing near the hole. For waterproofing the socket, a large piece of Butyl tape was used. Black wood screws were used to mount the socket. Since the 12/2 AWG wire that came with the socket is only 12 inches long, I had to solder an additional 2 feet of wire to reach the batteries. Shrink tubing was used to insulate the soldered connections.

As you can see from the photos, the new socket is in an inconspicuous location and looks great. It allows me to plug and unplug my solar suitcase into my batteries quickly and easily. It also provides me a way to connect my Windwalker 250 wind turbine to my batteries as well (though not at the same time as my portable solar suitcase). Even though I would consider this modification fairly easy, on a scale of 1 to 10 with 10 being the hardest, I’d have to give this project a difficulty rating of 2 because of the drilling that’s involved.

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About Mello Mike 299 Articles
Mello Mike is an Arizona native, author, and the founder of Truck Camper Adventure Magazine. He's been RV'ing since 2002, is a truck camper and Jeep enthusiast, and has owned and restored several Airstream travel trailers. He enjoys college football, hiking, travel, off-roading, photography, and fishing. He retired from the U.S. Navy in 2004 as a CWO3 after 24 years and now works as a project manager for a major banking and security firm. He also does some RV consulting and RV inspections on the side.