Originally Posted by Maine Sail
There are many, many, many el-cheapo solar panels out there with no blocking diodes in them. If using them without a controller they can become a load.. Many panel makers figure you will be using a solar controller so not all panels come with blocking diodes..
Ah, ok. Thanks for the tip. I bought an inexpensive panel, and it says it has a diode, so I kind of took it for granted that most of them have it. I guess not.