Hello again wise POP folks - OK, so I have my new 6v batteries wired in series (230 AH) and my new voltmeter installed directly on a free wire from the converter. I have been testing a few things out in the driveway before heading out for a cold desert trip this weekend. My main question (which has been discussed in many threads I have read - but I am looking for a definitive explanation if possible) is whether or not to interpret the voltmeter under load. Most threads I have read suggest to avoid interpreting your voltmeter under load; however, the 12 Volt Side of Life says, "This chart [the standard Voltage --> State of Charge chart] is designed to be used when monitoring a battery under load. This chart is a little more useful to the average RVer, as we are most interested in monitoring the state of charge of our battery bank while it is actually in use." For me, the variance is pretty huge (I have confirmed that the voltmeter is accurate with my multimeter). Even with <25 degree temps, the voltmeter reads 12.5 or 12.6 at rest. When I run the furnace and 4 lights (not yet switched to LEDs - they are on order, the PUP is NTU) during the cold of night the meter drops down to 11.9 or 12.0! When I shut things down the meter jumps back up to ~12.5. Let it go and enjoy, or be concerned? Thanks!