Golfer,
What has not been said here is that the Progressive Dynamics 92XX line were designed to be left powered on and on your bank for as long as you have power available. Though they call it a Three Stage, if you read their documentation, they are actually Four Stage. That fourth stage is a resting maintenance stage that regularly "Burps" the battery to promote electrolyte circulation and prevent sulphation.
This system will not just keep the bank as close to 100% SOC, but will extend the usable life of the bank. After 10 seasons, the house bank (2ae-GC2) were still about 80~90% of original capacity (as determined by my bank monitior). The only reason I replaced them was that I was offered a deal on a pair of new big name jars.
Matt