Adding extra solar panels

[Plug]

Advice needed my 2022 bailey caravan is fitted with a truma 100w solar panel i'v changed my battery over from lead acid to lithium 110amp battery we do 90% off grid caravaning all year round and was thinking of adding another 200w panel to the roof so in total 300w on the roof is it an easy upgrade just conecting the two panels into just one and then down to my 30amp solar regulator thankyou for any advice

 

[Beardy]

I have limited experience with solar, but from an electrical perspective ......
300W at 12V works out at 25 Amps. Your controller is rated at 30A so that would be OK. I had a quick Google and your battery should be OK charging at 25 Amps (check the manufacturers specification to confirm). My only concern would be the size of the cable from the existing panel to the controller, and from the controller to the battery. It would have been designed to carry 8.3 Amps and may not be capable of carrying 25 Amps without overheating.