When we initially installed the two 150W solar panels and Victron SmartSolar 100/30 charge controller, it was during the COVID-19 outbreak where we were Locked Down in The Bight. At the time, we oriented the photovoltaic panels in an overlapping fashion, facing forward to minimize wind issues during hurricane season. We also had them wired in series to reduce voltage drop and maximize production... as nothing could shade them on the coach roof with no mast or boom!
Unfortunately when we got the mast and boom finished and installed, this did indeed create massive shading issues for the array. We knew this would be the case, so now we had to fix it...
Normally on a sailboat, PV panels are arranged longitudinally to avoid shading issues by the hardware aloft, and they are wired in parallel rather than series to allow one panel in full sunlight to keep producing while the other is shaded and not producing. (Internal diodes will block the non-producing panel) Modern MPPT controllers are usually optimized for this usage scenario, and will attempt to find the best power point for the parallel array.
We brought new Renology aluminum Z-brackets with us from the states for the job, but because the PV panels were designed to interlock into the previous panel on a roof, we needed to fashion new support braces out of stainless to adapt them to the panels.
Don found a floating dock to do all of the grinding and metal work on, so we avoided the inevitable rust-stains on the deck and metal slivers in bare feet. Because let me tell you, slivers in your feet in the tropics are a very bad thing!
Swapping them out wasn't too hard with the two of us work, despite the gusty winds.
We had also cracked one of the panels when originally installing it, and had another on deck awaiting replacement. Interestingly enough it in no way affected it's performance, but it would likely affect it's long-term condition so we decided to replace it during the reorientation.
Just the 'ol switcharoo
Once the panels were arranged longitudinally, we re-wired them in parallel using inline Y-adapters for the standard MC-4 PV connectors, which we then hid out of the sun and weather behind the mounted panels.
We used Renology's Z-brackets on all four sides and when fully installed, they seemed to give it adequate strength under normal wind conditions. Regardless, I think we'll lash them down with a sturdy rope during a real blow, just to be sure!