While not personally familiar with the Megawatt, I do not need to constantly fiddle with voltage pot on my Meanwell if I do not want.
I can set it to 14.7v and the battery terminals will be somewhat lower than this depending on how many amps are flowing and how depleted the battery is.
When there are no dc loads on a charging battery, and the amperage increases to hold the same voltage, well Mex once said during teh screw31 thread, that this was the very beginnings of thermal runaway, and I stopped charging, or monitored heat build up closely when I saw this occur, on my old flooded battery. Never saw it on my AGM.
While charging slows a lot at 13.6v, compared to 14.7v, rather than turning it on and off, if you've got shore power I'd set MW voltage to 13.6ish, and let it go when you do not want to have to monitor it and then goose it to 14.7 when you can be there to monitor amperage and temperature. 13.6v is not going to heat a AGM battery at 77f ambient.
The Micropotentiometers provided with these powersupplies are not meant for constant adjustment. They are rated for only 25 or 50 cycles, and that is a Bourns brand( usually blue in color). Who knows what the cheaper orange ones are rated at.
I hope the simple instructions as to how to replace the provided pot with a 10 turn upgraded pot can be published soon. I've done it on the cheapowatt, and my Meanwell. I removed electronic guts from casing to do so, but I think Mex has a method for accomplishing this without removing the guts to access underside.
Removing the guts is pretty easy, but one should have new thermal grease for reassembly as the transistors using the casing as a heatsink.
