The time it got to 21.5, it was charged by ac utility company power, which as I said before charges at the maximum 40a or whatever I set the max too. So it was not a helpful example of solar max current. Last month my battery bank got as low as 25.4v and the solar charging current did not get anywhere near it's maximum capacity. It charged at about 30-40% of it's solar max potential.26.9 was just an example. I can’t recall what number triggers the lv2424 to begin a bulk cycle. I’m doubt 26.1 will trigger a bulk cycle either. Did the unit charge as expected the time you drained the battery to 21.5?