getting the correct cable gauge.

[CAP]

They are well beyond dead. When fully charged up during th eday with the panel producing power you should be seeing around 14 volts. 11.9 volts at rest is completely discharged. 11.7 is toast.

i took the voltmeter out today and it read 13 volts at the battery,could the power be draining unnaturally when i am running something. the ac hookup of the rv is pluged into the inverter, that wire is about 4-5 ft to the circuit breaker

[Sunking]

i took the voltmeter out today and it read 13 volts at the battery,could the power be draining unnaturally when i am running something. the ac hookup of the rv is pluged into the inverter, that wire is about 4-5 ft to the circuit breaker

Very well could be. If that is the case try this experiment. Measure the voltage simultaneously at the battery terminals and the load device input at full power. If you see say 12.6 volts at the batteries, and say something like 11 volts at the load device means there is too much resistance in the path. That resistance can be many things most notable too small of wire for the distance or poor connections. If the battery voltage collapses it is the battery.