My Vector smart chargers work ok on MSW.
How did you measure that amount of recharge achieved for the comparison of times?
You would need to start from the same state of charge (SOC) and get to the same higher SOC and compare the times. It is fairly simple to get the starting SOC from a "mostly" resting voltage (nothing much 12v running at the time) it is very hard to determine the subsequent SOC as charging proceeds because now your battery voltage rises, and your hydrometer is behind the problem due to "SG lag"
If you have an amps read-out on the charger that helps a lot. My "marker" for 90% SOC when to stop the charge is when amps have tapered down to 5 amps per 110AH of bank at 14.5 volts. eg with a pair of 27s at 110AH each, that would be when amps are down to 10 amps.
Anyway, without some way to tell charging progress, how can you say it takes three times longer using that method?
