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I'm certainly no solar panel expert, so take this for what it's worth:
Polycrystalline solar panels are "old technology".
Buying them is sort of like buying a second or third generation smart phone. They may work OK today, but they aren't as good as today's technology and they may not be able to work on "tomorrow's technology"...
Like that "older smart phone", it connects to G-3 and G-4, but not to G-5 and more and more apps won't function on the older phones... You can still "make calls and use most of your current apps, but as they are outdated, they're no longer supported and the phone becomes "an old NOKIA" that works on 911, but not much else...
Solar panels are "solar panels" but as things change, how many of the "new technology components" will still work with the "old technology components".
monocrystalline panels are not that much more expensive, significantly more efficient (fewer panels to get the same watts and they work better on cloudy days) and there's a much better chance that 'tomorrow's technology" will be able to support them. Polycrystalline panels, on the other hand, work great today but in 4 or 5 years, will you be able to connect them to your new controller when this one dies ???
To me, buying "old technology" is much the same as buying a "Windows 8 computer because it's cheaper than a Windows 10"
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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