I will bet you have a single 100 watt panel and a Go Power 10A controller. That is what I have on my 2021 Axis.
That controller might work with a second 100 watt panel, but you have to bend the specs a little as others have also said that the Go Power 10A spec has lots of slop in it and should work fine even with 200 watts of panels.
So buy a Renogy, HQST, Newpowa, etc 100 watt panel from Amazon, an aluminum mounting kit, 10' or so of MC4 cables and a parallel connector kit. Mount the panel with screws through the aluminum feet with lots of Dicor sealant below and above and around the screws. Then hook up the 10' MC4 cables from the new panel to the existing one in parallel to the power port on the roof.
You should then read 10 or so amps on the Go Power display in full sun at midday.
If you want more power, replace your controller with a Renogy or similar 40A MPPT controller and install a total of four panels wired in series/parallel to the power port. Beef up the wire from the controller to the batteries to 6 gauge.
David
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