I would set the offset voltage, if you are boondocking and running about 210 amp hours of parallel 6v GC2 batteries, at 14.8V.
If you are running something like car battery construction accumulator Screwy 31's or screwy 29's or a single or a pair of Trojan T-1275's, which can be a bit problematic or tempermental in recharge needs, I would go to 15.0V.
If your batteries are at a 60 to 65% SOC or starting out at 12.25 or less Volts when charging, and it's past 10 am, and you just then hook the panels up and your panels are aimed directly as possible at the sun, you should see 11 Amps charge rate on the panel if you push the far left button 2x to get an amp reading.
11 amps is pretty healthy for 210 AH of batteries needing a recharge, IF, they are portable, and if you keep aiming them directly at the sun for maximum yield.
