voltage meter for inside camper

I went with a simple voltmeter from Mouser, just voltage of the battery is shown, it'll bounce around as the load on the battery changes, and will give you an idea of the condition of the battery when most of the loads are removed.
Most of the other functions given by others is interesting, but since I am not doing battery research the current draw and remaining capacity readings are just icing on the cake. KISS

skipro3 wrote:
I bought this and it is really cool;
https://www.ebay.com/itm/DC-Battery-120V-300A-LCD-Voltage-Current-Watt-Power-capacit-Digital-Combo-Meter/162144298635?hash=item25c08da68b:m:msNz_Ko6X9OlmwwnCn2IGLQ

I use one of these on my repowered electric bicycle. Note the display module will read the output of the shunt module wirelessly.

trail-explorer wrote:

skipro3 wrote:
I bought this and it is really cool;
https://www.ebay.com/itm/DC-Battery-120V-300A-LCD-Voltage-Current-Watt-Power-capacit-Digital-Combo-Meter/162144298635?hash=item25c08da68b:m:msNz_Ko6X9OlmwwnCn2IGLQ

Interesting product, but the description is full of a bunch of rambling nonsense from someone that doesn't speak engrish very well.

Took me some trial and error to figure it all out, but it seems to do just about everything. Good project when it's rainy.

skipro3 wrote:
I bought this and it is really cool;
https://www.ebay.com/itm/DC-Battery-120V-300A-LCD-Voltage-Current-Watt-Power-capacit-Digital-Combo-Meter/162144298635?hash=item25c08da68b:m:msNz_Ko6X9OlmwwnCn2IGLQ

Interesting product, but the description is full of a bunch of rambling nonsense from someone that doesn't speak engrish very well.

for a simple easy to read setup its hard to beat this one on ebay... its marine rated, affordable, and charges thru the mini usb at 2amps for cameras and other quick charge devices...
I use them in my trailers and boat....
https://www.ebay.com/itm/Waterproof-3-in1-Car-Triple-USB-Charger-Port-Voltmeter-Cigarette-Lighter-12V/391756384751?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649

The OP asked for a volt meter.

Here is a simple, cheap volt meter that plugs into any cigarette lighter outlet.

https://www.amazon.com/INNOVA-3721-Battery-Charging-Monitor/dp/B000EVWDU0/ref=sr_1_10?ie=UTF8&qid=1517594715&sr=8-10&keywords=auto+voltmeter

$12

Voltage by itself isn't a very good way to measure SOC of the battery unless you can isolate all sources of charging and discharging for a while. But if all you want is current momentary voltage almost any cheap meter will give you a decent measurement including those you just plug into the cigarette lighter.

If you want a better meter to measure SOC consider a shunt based meter. More work and money to install but better info..

I bought this and it is really cool;
https://www.ebay.com/itm/DC-Battery-120V-300A-LCD-Voltage-Current-Watt-Power-capacit-Digital-Combo-Meter/162144298635?hash=item25c08da68b:m:msNz_Ko6X9OlmwwnCn2IGLQ

Years ago I bought 12V thermometer with outside sensor for about $10.
Side bonus - it also displays voltage.
When voltage is not giving you real battery stage, it sure will tell you good time to start generator.

As towpro said..."remember any time load changes you will see voltage change"

I find my inexpensive volt meter irritating bouncing up and down, and have unplugged it.