What to look out for when buying used Skypanel ?

[pete_f]

Hi,

I'm about to purchase a couple of used Skypanels.

What should I check on the panels before committing to the purchase ?

Are there known issues/bugs with these panels that I need to be aware of ?

Are there counterfeit units of these, and if so, how would I recognize them ?

Any input appreciated !

Thanks !
Pete