Mine get strapped to a plow and whips whistle and pop. Ten watts of additional fan cooling isn't going to break the bank.
Time to get serious for a moment.
My charger design philosophy is this:
The Mega what the whatevers. Be conservative, and call it 90 amps battery charging potential. Three units. For the most part balanced to 14.8 volts. This is maximum absorbsion limit. A long duration (6-12 hour) wind up spring timer. Mechanical and foolproof. NO HOLD feature. An overwhelming percentage of the time, this charger is going to see group 27 flooded or group 31 AGM batteries. This is why I need to have that 15 turn pot, the AGM is set to 14.4 volts with a dial. Plug it in, turn it on, set the voltage, turn it off, connect the charger clamps and presto the charger is set voltage wise for the battery. At full absorbsion voltage a 50% depleted group 27 should regain a great majority of it's charge in 2-1/2 hours. Connected to public power when the three PSU's shut down a 2-ampere 13.2 volt maintenance charger takes over, automatically.
So the three PSU's will never stress. Voltage will rise instantaneously to absorbsion limit. The timer is the moderator. How much time at absorbsion limit? Battery state of charge tells me that, and I do not need to measure specific gravity all the time because the charging is voltage limited. Even if I fart while dialing in the timer and set it for four hours instead of two, the two extra hours will do nothing but top charge the battery -sue me. Having the ability to Voltage control, is magic.
The case I'm using is a cheese grater sola UPS. Sometimes Jesus goes out in the morning for a few hours, returns and wants to jam pack his LTH battery before he goes out again. Fastest safe charge. When I am in a hotel room and the lights come back on for an hour or so the AGM battery will see maximum possible amp hours replenished.
The instant the art deco miracle battery system becomes adjustable it loses its "All Must Bow Before Me" Mystique. No longer a plug and go sit grab the remote and go into a coma authentic smart charger. Salesmen wail, customers quail.
