I gather from Mex's posts, that "saturation charging" means you hit the battery with such high amps wrt its size in AH at the charger's set voltage, at whatever SOC the battery it is at, that it goes straight to Absorption--amps tapering--and you get no constant amps Bulk stage with your current-limited charger.
Of course this means the lower the SOC of the battery at any charger set voltage, the higher the charger's amps limit has to be. And that means you need enough generator VA to run that charger to do that.
