September 2017, I purchased a Thuderbolt Solar 100 Watt Solar Panel Kit for $154.25.  This kit seemed really clever but the controller failed to work.  I measured the voltage from each solar panel with a volt meter and each panel put our 22 volts.  When all the panel were connected to the controller, nothing happened.  I could not get the controller to turn on.  It was dead.  I waited too long to contact Harbor Freight to get this resolved.  I expect products to work out of the box.  This product, for me, failed this expectation.

Both Thuderbolt products and Harbor Freight are not recommended.