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> why not use solar panels on your fence if it is cheaper than any other options.

I was considering this earlier in the year, as it happens.

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The biggest issue I can see is that you would want a micro inverter or solar optimizer on every panel or every other panel to get decent output which would add a lot to the cost.
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Don't take my word for it because I still feel like I don't fully understand the situation, but are you aware of the current state of bypass diodes and shadow scanning in mppts? The situation seems to have changed a lot in recent years.
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Just checked my local online store - non-structural plywood is still about 5-10x cheaper.
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