I'm fairly confident on the SOG in that actual useage seems to parallel the percentages. I am puzzled by the SG though. I'll check into that. Before I started I disconnected the battery B4 disconnecting the charger so's to check unloaded voltage. It was 15.3 or so, so I adjusted the touchy pot down to 14.7. Maybe a mistake...it was on 3 stage. Instructions say to switch to fixed...verify and adjust to 14.6....then switch back to 3 stage. That also unfortunately caused the Trimetric to loose SOC bearings. I won't have that back till the batts hit 100% again. That switch and hole to access it is TOOOO flipping little too. You can't really see in there and can't "feel" the switch move. I've got to un-mount the charger off the pass through roof just to better look at what I'm doing to switch that **** switch.