So today had more sun and the meter was reading around 25V. I dug around and was able to pull the "quick disconnect" apart. They don't always want to disconnect, and certainly not quickly. The disconnect was the positive lead between the charge controller and the battery bank.
Immediately, the meter dropped to 22.58, which just verified that they had been getting power from the panel. I then left and came back 3 hours later. The voltage had dropped to ~20V. This confirms that at least one of the batteries is bad.
So next week, I'll bring down my battery tester (the one that measures specific gravity) and hopefully a nice funnel or water bulb (like you sue for ears) to refill the water in them.
If a battery is fully bad, they should have a multi-year warranty that I need to check out.
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