It depends solely on what you have on your roof now. Panels are sold in "nominal" voltages - 12, 24, 48 etc. But a 12v "nominal" panel is very likely to put out 17v to 20v even as high as 22v. The same is true for the higher nominal voltages. 24v is 30+v and 48v is 52+ volts.
You want your portable panel to be relatively close to the same nominal voltage you have on your roof now. Do you know the nominal voltage of your current panel? I know some Winnebago's are 12v nominal and others are 24v nominal.
You can tell buy reading any literature that came with your panels in your TT. Failing that, you can just use a voltage meter (a multi-meter) to take a reading either on the roof where you panels are plugged in. Or at the solar controller where the wiring from your roof attaches to your charge controller. If your controller has a screen it will likely show you the voltage from your roof panels, too.
Next you need to know how the portable port on the side of the TT is wired. Sometimes it's wired into the charge controller and sometimes it's wired directly to your batteries.
Again, using the multi-meter check the DC voltage on the two prongs of the solar port on the side of the TT. If it reads higher than 14v it's likely wired to the solar charge controller and if it reads 13v or less it's likely wired to the battery. This assumes you are parked in the Sun, of course.
This is important because if it's wired to the battery then you must buy a portable kit with a built in or additional solar charge controller. But, if it's wired to your exiting charge controller then you need to either buy a portable panel without a built in solar charge controller or you need to remove such a controller if you get a panel with a solar charge controller.
Also, be mindful of the plugs. The plug on your TT is likely a SAE plug, especially if it says ZAMP on it. Most solar panels come with MC4 plugs. You'll need to buy a MC4 to SAE adapter to make the switch. Some are even sold as MC4 to ZAMP, though ZAMP is not an official standard, just very common.
And, just one more thing to be aware of - SAE plugs have a "male" and a "female" connector. Make sure that the "gender" of the SAE cable you get is the same as the side of your TT.
I know that all sounds like a lot. But honestly, it's rudimentary and you'll get the hang of it easily. Just take it a step at a time.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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