Ok ,
Charge while driving!
After many years of dc, charge conversations, I found a no-brainer. At least for me.
I put my norcold on setting 1 while driving. Everything inside was still cold after 6 hours of driving, and my batteries were taking on a charge. And I'm doing the same at night while dry camping
Only an FYI.
Works for me.
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what does switching to setting 1 on the fridge do for you?..... are you running a residential fridge?...
RV refrigerators operate on propane, but the control board uses a wee bit of energy to sense and operate the fuel valve and ignitior.... and changing the setting does hardly nothing to conserve 12v power.... but it will conserve propane.
..and the charge you get from the truck to the rv batteries may offer a few amps due to the resistance in the wire, but it could be enough to keep the battery from being discharged more than it otherwise would, while you drive...
the resistance causes the voltage to drop, and if the voltage drops, there is no pressure to push the amps....and the farther it gets down the wire, away from the charge source, the lower the voltage will become, and in this scenario the current flow can actually stop flowing.
if one were to install a #4ga or larger wire, it would help a lot with the current carrying capacity of the charge wire.... because if the truck batteries are fully charged, the voltage in the system will be at its "float charge" level, which isnt hardly enough voltage to push the amps thru a smallish wire of the length needed to get it to the RV batt, and so it just trickles its way rearward.... and the bigger the wire would allow more current/amps into the wire, and make the leisurely stroll back to the house batteries faster....