How To Use An Accurate Voltage Panel Gauge For Diagnostics.

Right it stops counting watt hrs and amp hours at 100% when recharging
Just charge until charging amps are less than 0.5 amps per 100 ampHrs of capacity
200 ampHr bank, 1 amp charge rate at 14.xx volts
Bank is full
An meter is reset, and you can see your discharge use

The eBay one automatically calibrates; just charge until it says 100%. It seems to take some charging current after reaching 100% but never indicates over 100%. A very simple means of calibration after setting the capacity amp-hrs when initially setting it up.

• Nothing is perfect. Hydrometer samplings are very sensitive to "Lag and Overrun"
• An ammeter is a poor choice for determining resting battery state of charge
• kWh or amp hour meters need regular zeroing and restating of CEF.

Well you can't have everything

i put one of those of the 200A version in the previous RV the Safari

a 100A is best for most users, 200A if you have an inverter that can draw over 100A use

750A will be less accurate counting 10-20amp Normal loads
and 30-60 amps avg charging
its a matter of the calibration accuracy of the shunt used for measurement

A voltmeter cannot tell the % of full charge because any load diminishes the voltage, any charging increases the battery voltage for at least an hour (I’ve seen well over 13 volts two hours after a short drive in our class C - does that mean it’s over 100% charged?). Why not go straight to a monitor that counts amp-hours going in and out and always displays the per cent of full charge?
Here is one for $40. Some basic knowledge of current and voltage needed to install.
eBay.com

Oh no, I'm infected with that Captcha bug putting up CloudFlare error messages. It happens on ipad Safari and Windows 10 Firefox for the first time tonight. Impossible to post!

MEXICOWANDERER wrote:
To elaborate the gauge can detect issues with the electrical/battery system.

A gauge doesn't detect anything, it displays stuff though.

There was a picture posted....

You are absolutely correct. I should use the term FIVE NUMBERS. The meter will register a maximum of 33.000 volts. But rather than involve decimal and fractions I tend to simplify things. But I really should have put a caveat somewhere in there.

Thank you for the correction :)

In addition if I wanted millivolt accuracy I'd question just how accurate in a $5 voltmeter? And it certainly would be less accurate when the power and sense lines are combined and then wired back to the battery. But no problem for bedtime viewing!

Seems there is confusion about the number of digits. The decimal counts as a digit. A 5 digit reads hundredths of a volt when in 12v range. Millivolts would be a 6 digit. I agree millivolts is not useful in an RV.