Although a Caravan roof is generally a dis-jointed space, Safiery solve this problem by combining solar panels of different sizes and technologies with our DC DC for Solar.
These are a "1/4 brick" high frequency planar transformer that pass the current through a looped circuit to the solar MPPT controller AND add the solar power of each attached solar panel.
However, these units have to be cleverly designed so they don't fight the solar MPPT controllers like Victron.
Its took Bruce 3 attempts in design with failed products before the secret sauce was perfected. Safiery extend full 5 year warranty of these products and all the roof solar panels sold.