Originally Posted by Lmm
My batteries arenít reaching over 13 volts from shore power, I must have another issue
The battery voltage applied when charging from the converter (or alternator) will go from 14.5 VDC (bulk charging), to 13.6 VDC (absorption charging) to about 13.1 VDC (float charging). Once the charge is removed a good battery will return to its fully charge voltage of 12.6 VDC to 12.8 VDC after an hour of so. IF your batteries are being fully charged (which takes hours, 4 to 6 depending on the State of Charge (SOC) when beginning the charge cycle, and they are dropping to 11.7 VDC in a day, then you have a significant draw on the batteries or their capacity has been diminished.