SOLAR PANEL JOINING

As long as they all have roughly the same open circuit voltage they will work together together on a series pass regulator. If you run a few unmatched panels into a MPPT controller you are going to give it a difficult time.

Hi Peter
Totally incorrect,
As stated elsewhere provided the output voltage is close on each you can PARALLEL connect a 10W & 100Watt panel & get the combined wattage of 110W[both will work effectively together]
BUT different wattage panels should NEVER be connected in series for higher voltages
In such an arrangement, the current capacity of the smallest panel is the limit

Peter

i agree with that what he said
Terry

Hi
Joining different wattage panels of near the same voltage rating @ MPPP in parallel [pos to ps &neg to neg] should not give any problems,using a single common reg of sufficient capacity
This ,I believe, is what the OP wishes to do

I would not direct parallel panels with vastly different out put voltages,
but such could be used IF they each have their OWN reg

IF each panel is fitted [as supplied] with it's own reg simply connect each to the battery
Each panel & reg will then do the best it can

Peter