The main difference is this...
(It takes human intelligence to operate the Megawatt, correctly). To settle this issue I will offer to bet a hundred dollars versus fifty dollars that I can recharge a depleted RV battery fifty to 100% TWICE AS FAST as any automatic charger. But it does take a bit of involvement. Like arising from a chair and check a battery cell to see if it is bubbling.
Batteries are PREDICTABLE. If it takes 2.2 hours to recharge from 12.08 volts static one time it will take 2.2 hours the next. I recommend a wind-up Intermatic Timer.
But for short-duration weekenders and umbilical connected specials, the semi automatic charger would be the best choice.
A five-hundred amp charger is useless if it decided to switch to float when the battery is 80% charged.
If there is a FULLY programmable charger out there, then it would beat the snot out of the Megawatt. The 25 year old Trace 2500SB modified sinewave inverter/charger was fully programmable and had all the bells and whistles.
