Can I use a portable solar suitcase and roof panels together on one RV battery?

Answered by RV Parts Giant · Upland, CA · November 9, 2026

Short answer: Yes. The clean way is a separate charge controller for the suitcase, with both controllers wired to the same battery. Plugging the suitcase into the roof controller works only if it has headroom. The Rover 40A in Renogy's 400W roof kit is rated for 520W at 12V, room for one more 100W panel but not a 200W suitcase.

Yes. It is a common setup: roof panels cover the days you park in the sun, and a suitcase covers the days you park in the shade and set the panel out where the light is. The question is where the suitcase plugs in.

Option 1: its own controller (the simple way)

Run the suitcase through its own charge controller, and wire both controllers to the battery, each with its own fused lead. Neither controller has to know the other exists. The battery simply takes current from both.

This is how our calculator builds large arrays too. A single 12V MPPT tops out near 700W of panel, which is 50A of charge current, so above that it lists one controller per sub-array, all charging the same bank. A roof array plus a suitcase is just a small version of the same idea.

It is also the cheapest way if you buy the right suitcase. The Renogy N-Type Suitcase Kit (100W or 200W) comes with its own Voyager 20A PWM controller. You only need the cable run and a fuse at the battery.

Option 2: into the roof controller

This works only when the roof controller has room for the extra watts and the suitcase's voltage suits it. Renogy's own listing says to check that your charge controller is sized for the extra input before adding a portable array to an existing system. Take the 400W roof kit as an example:

Check	Renogy 400W roof kit
Controller	Rover Li 40A MPPT
Rated at 12V	520W, so 120W of headroom over the 400W array
Fits	one more 100W panel, not a 200W or 300W suitcase
Voltage	the suitcase's open-circuit voltage must stay under the controller's solar input limit

So a 100W suitcase can share that Rover, while anything bigger gets its own controller. The roof panels are 22.79V open-circuit each. The 100W N-Type suitcase is 21.6V, a close match. The 300W suitcase is 30.3V and needs an MPPT of its own.

What the pair puts in a day

Using the calculator's 75% harvest factor at 4 to 5 peak sun hours, the 400W roof kit makes about 1,200 to 1,500Wh. A 200W suitcase kit adds about 600 to 750Wh. Together that is 1,800 to 2,250Wh a day, more than double a fifth wheel's calculator day of about 832Wh without AC.

A shunt monitor on the battery shows the combined charge from both controllers, so you can see what the suitcase really adds at your site. Run your own numbers in our RV solar & battery calculator. The solar figure it gives is the total, so split it between roof and suitcase however your roof allows.