A failure at any point in the series will shut the entire system down.
Mixing different solar panels in series.
Matched voltage even better.
Both must have a diode or both not have a diode and some kind of external power control to protect the battery.
Another option is to take multiple solar panels and wire them together to equal the same output as the other mismatched panel.
Dc power is inherently lossy compared to ac power when sent down a long wire.
In it for the long haul.
For solar panels connected in parallel total power is calculated as follows.
Though mixing different solar panels is not recommended it s not forbidden and things would be ok as long as each panel s electrical parameters voltage wattage amps are carefully considered.
Mixing different capacity panels will reduce total wattage output.
Total connected power 140w 150w 150w 150w 590w unlike solar panels connected in series the different wattage parameters do not effect the overall outcome of the array.
When mixing solar modules is important to remember that it is not the wattage of the modules that is important to consider.
Now if you do have two different solar panels two different sizes the best solution with charging a single battery bank is for each of them to have their own charge controller.
The parallel connection allows to increase the current keeping the same voltage.
In short must be the same voltage.
Both panels within a few hundreds of a volt.
Series connection of two solar panels with different current if we have two or more solar panels with the same voltage but with different current it is not possible to wire them in series.
Properly done yes you can parallel the panels for more current.
Nonetheless it is possible to wire them in parallel.