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.