Can't help with Amps as it depends on the Battery/load. You should read about 12.7 volts new after 24 hours of rest and air temps of 65 degrees. If colder then 65 you will read less. There have been charts posted on the forum that will help you with this info. Do a search on battery condition and you should find the charts.
Frank O.
Frank and Vicki
Niwot, CO
2006 Itasca Sunrise 35A
States visited/camped in, not just driven through.
Do NOT set your meter to amps (current) and measure across the battery. The little tink you may hear will be the fuse in the meter giving up its life to hopefully protect the meter, and possibly your fingers. You want to set it to DC Volts, with the lowest range above 12. If an analog meter, be sure the red is on positive, etc. Doesn't matter if it's a digital meter, it'll just read negative volts. Always be careful when messing with the batteries. They only have 6 or 12 volts of potential, but a whonkus amount of current capacity ready to jump out on you.
Sorry, don't mean to sound preachy, and you may have already known this. But on the slight chance that you did intend to say amps instead of volts, I hoped to save you some grief.
"It's a dangerous business - going out your door. You step onto the road, and if you don't keep your feet, there's no knowing where you might be swept off to..."
If your charger is putting out about 13.5 - 13.9 volts, and the amperage out is less than 5 or 6 amps, the batteries are fairly full. Yes you can still keep stuffing more amperage into the batteries, but much of that energy will be used to heat the battery and convert the water into gas.
If the charger is putting out 14.4 volts and over 20 amps, then the battery is in the "Acceptance" mode, where it it charging quickly. Usually good chargers will do this to quickly refill the batteries, and that allows minimum generator run time, and maximum charge rates.
When the charger goes from 40 amps at 14.4 volts (about 600 watts) down to only 10 amps at 13.5 volt float voltage, the wattage at that point is 135 watts, so might as well turn off the generator at that point.
Fred.
Money can't buy happiness but somehow it's more comfortable to cry in a Porsche or Country Coach!
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