The reason I thought it might have been over charging is the needle on the gauge was just under the line between 28 and 32 which would be 30 volts. I checked the voltage between the positive terminal on the starter and the negative ground with an accurate digital voltmeter and got 27.4 volts.So I think it is fine. The only real question I have left is if it is normal for the volt meter to show the voltage before the engine is started.That sounds like it's working like it should. You'll see about 14 on a 12 Volt system, and 28 on a 24 Volt system.
In contrast, with the Winter SEE, after having a cup of coffee while the oil pressure gauge catches up, I rev it just enough to make the charging kick on (and I'm sure you meant 0.8K). Normally it sits around 26-28 Volts for a while, then starts climbing. It'll peg the gauge if I let it.
Wiggling the master switch a few times brings it back from "run-away mode", but then it goes to at about 24, which isn't enough.
The problem is that for the first 15-20 minutes it can start climbing again, numerous times. With the old lead acid batteries I'd notice the smell if I wasn't in the cab, not so with the Optimas.
Anyway, it's second nature now to keep an eye on the gauge, and I can also hear if the voltage starts climbing - it changes the engine rpm a bit.
Other than the batteries themselves, and the gauges, I don't think the over voltage can hurt anything, if nothing else is on.
Of course, there's no need to look at the gauge when the wipers and heater fan are on, like when running the snow blower. Then the wipers provide a very obvious visual clue, and the fan an audible version, when they enter warp speed.