A couple of times we have been asked "Can I run two solar panels in parallel, so that I catch both morning and evening sun" ?
It would lovely if this "just worked" - but it's not a simple yes. Even though the current would be doubled having two in parallel, the voltage of the combined system would be the same, and would be pulled down by the solar panel in the shade, which means there would not be enough power to charge the battery.
If you have the ability to add a blocking diode, you *can* wire two in parallel, as per this guide: link
I run two, the control just switches a relay for the pump and valves and is charged off the supplied panel. The pump and valves are run off a 12 v leasure battery and this is charged off a 50 w solar panel. I have run this gor several years with no issue.
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It would lovely if this "just worked" - but it's not a simple yes. Even though the current would be doubled having two in parallel, the voltage of the combined system would be the same, and would be pulled down by the solar panel in the shade, which means there would not be enough power to charge the battery.
If you have the ability to add a blocking diode, you *can* wire two in parallel, as per this guide: link