How's my "6v" Solar working?

Vintage465 wrote:
So when I bought my new trailer it came with 300w of solar and a Samlex controller. When I first got the trailer home I installed one of the old 12v batteries from my old trailer and it regularly read 13.7 to 14.4v. Before leaving on my vacation I purchased two Interstate 6v batteries and wired them in series. This set up will read a maximum of 13.4(no load)when the sun is shining and the solar is charging. When the sun is gone the voltage is dropped to 12.9, maybe 13.0v. I didn't really get a chance to put them to the test as we were staying in RV parks most of the time. If I spent the night somewhere and didn't plug in the voltage dropped to around 12.6-ish over night. "overnight" would have included the average careful usage of lights, and a C-Pap running all night w/o the humidifier. So I guess my first question is: Is it normal for a pair of six volts to register a lower surface or peak voltage than a single 12v?

Thanks,

Have you removed the controller from the wall and checked the dip switches? Dip 1 = 12 volt system. Interstate recommends 14.7 now and equalize at 15.3 volts. Set the 3,4,5 dip switches at either on,off,on (this will set bulk at 14.6 or on,off,off 14.8 volts. Have fun with your solar!