Lorentz LA20-12S 20W solar panel

cmedsailor

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I was planning to buy and instal one of these solar panels but reading the instructions made me worry and I am now making second thoughts. They somewhere say:
"...LA series use all-back contact solar cells for high efficiency. This technology leads to possibly suffering from a temporary decrease in performance if installed according to common methods without grounding or with negative grounding..."
What grounding? It will be installed in a boat, not on a roof! And how much decrease in performance? It has max power current of 1.2amp, which I expect to get most of it in the hot sun here in the Med so how much less performance I should expect without any grounding?
Anybody who have used those?
Thanks
 
Well I have managed to get an answer directly from Lorentz in Germany.
Without grounding the lose is less than 5%. So, it's really nothing.
Hopefully by Sunday I will have it ready for my boat.
 
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