I bought a new 221RB which I have had for about five months now. In spite of coming with a 150w solar panel the battery has gone dead three times, all happening when the trailer was parked and nothing turned on. On one of many return trips to the dealer they metered the voltage at the battery as 13.3 volts, indicating it was being charged. I metered it at home after bringing it home and got 12.2 volts. Sunny day, the charge indicator on the charge controller was flashing which my manual says means 'charging.' But it never quits flashing. We hope to dry camp but want to have confidence that our battery won't go dead. Any ideas? P.S., when plugged in to shore power the voltage at the battery still reads 12.2.