If you connect these four panels in parallel all of them must have the same voltage and therefore will generate at the maximum possible voltage for one of the panels which means 9v.
How to connect 3 solar panels in parallel.
Solar devices are normally attached in parallel to achieve greater output current.
Combining different solar panels in series.
When solar panels are wired in parallel the positive terminal from one panel is connected to the positive terminal of another panel and the negative terminals of the two panels are connected together.
Connecting solar panels in parallel.
Add up to combined power 150w 150w 150w 150w 600w.
For photo voltaic components attached in parallel absolute power is determined as cited below.
Consider having a set of four solar panels.
Wiring solar panels in a parallel circuit connect all the positive terminals of all the solar panels together and all the negative terminals of all the panels together.
The positive wires are connected to a positive connector within a combiner box and the negative wires are connected to the negative connector.
The connection of multiple solar panels in parallel arises from the need to reach certain current values at the output without changing the voltage.