12 volt fluctuations

[Tncatfanforever]

I have a 2018 Georgetown V. I am camping for the first time since January. I have noticed that while driving the voltage is 14.1. When I plug into shore it bounces between 14.0 to 14.1. I have a 12 volt refrigerator. Then suddenly for no apparent reason the voltage drops to 13.1 or 2 and even as low as 12.9 and remain in that range until unplug shore power and plug in again. I would appreciate some assistance here. Thanks

[Chuck_S]

14.1 and 14.0 are within the margin of voltage meters not designed to monitor nuclear reactors. Good enough. 14.05v will probably bounce between 14.1 and 14.0. Remember the "Significant digit" from high school physics? Unless you're measuring to 2 or 3 decimal places you can get what you describe.

Driving voltage around 14.1 sounds right as the alternator is charging the battery(ies) and needs at least a volt higher charging voltage than the battery has.

Electrical loads will lower the voltage. The more load the lower the voltage can drop.

-- Chuck

[Tncatfanforever]

Originally Posted by Chuck_S

14.1 and 14.0 are within the margin of voltage meters not designed to monitor nuclear reactors. Good enough. 14.05v will probably bounce between 14.1 and 14.0. Remember the "Significant digit" from high school physics? Unless you're measuring to 2 or 3 decimal places you can get what you describe.

Driving voltage around 14.1 sounds right as the alternator is charging the battery(ies) and needs at least a volt higher charging voltage than the battery has.

Electrical loads will lower the voltage. The more load the lower the voltage can drop.

-- Chuck

Thanks for your response and I am assuming you don’t think I have any serious issues vv

[tomkatb]

To add insult to injury.

Wet cell voltage of the battery is 0-12.6. Period. 12.1 is about 50% charged.

Any voltage above 12.6 means some thing is charging it. Nothing else.

The alternator will run from ,13.1 to 14.5. Sort of the same for a converter.

All wet cell batteries must sit an hour without any charging to get an accurate reading. Residuals disapate .

Plugging in a big user lowers voltage. Wow what my hydraulic levelers do.

The only trustworthy reading is from a hand held voltmeter on the battery terminals. All those other little devices with their pretty little gages are plus and minus a bunch. Worthless in troubleshooting for the most part.

Agm are a little higher as are lithium.

We have a blutooth battery monitor that is blutooth. Very informative. $30. I trust it.

[Chuck_S]

What Tom wrote.

-- Chuck