Power over time.
Got 4 of these for an array on a pole. 2 from eBay, and 2 from Am**on. I put 2 series sets returning about 33 volts each. On a 70 foot run using a 6 awg wire. I get on a good day about 300 watt at max.
So I have 25% loss. I know my inverter uses 10%. So I'm looking at a 15% loss. The 6 awg wire has no more then 5% loss. So 10% loss that could be my angle, clouds, to hot (Phoenix), or the panels.
Little tip for DIY I found is with the right inverter try getting the volts as high as you can. More volts = less loss, and less wire needed. Example the power company uses 750,000 volts allowing those same wires to feed house after house.
Renogy make this same 100 watt panel however HQST gave me the best deal.
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