solar panels VMP

Submitted: Wednesday, Feb 05, 2014 at 15:40
ThreadID: 106094 Views:2101 Replies:1 FollowUps:0
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This seems to confuse me especially when I am looking at buying another portable solar panel. My current 120 watt solar panel made by rich solar & purchased off EBay (Bit Deals) is specified as 17.8 maximum power voltage with a maximum power current of 6.74 amps.
I have been to Home of 12 volt in SA who tell me their 120 watt Blue apple panels are A grade panels & I will admit are in a better frame & a much better leg support. But the VMP on the blue apple is 19.5 volts so therefore the mpc is only 6.44amps I know this is negligible but I would like to know why & how there is a variation and two is a 19.5 volt panel better than a 17.8 volt panel. I do know that some cheap panels are sold that are 14 volt mpv and understand that they will struggle to fully charge a battery.
As an aside are these cheaper panels on EBay a second grade panel or are they A grade as the sellers state.??
Thanks for your time to ponder, consider & reply
Daz
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