"So the OP has 2 x 6A panels," No, No, a thousand times, NO!
He has two 120w 12v panels. With PWM, your expected amps is the panel Isc total. A typical 120w is 7.6a Isc. It is all proportionate--An 80w panel is 5.1, a 100 is 6.2, a 130 is 8.2 etc.
Pick a watts number and you can get your expected amps pretty closely by using say the 130 at 8.2.
EG a 120 would be 120/130 x 8.2 = 7.569
Never use Imp with PWM. And before going bananas on this again :) ---
you get the "same as Isc amps" ---because as we all know, you can't get Isc with a connected panel. But you do get that same amps number.
Just aim the (say) 130w disconnected panel at the sun and read off the Isc with your meter. Say it is 9AM, and you get 5 amps. Connect up and you get 5 amps to the battery as seen on the Trimetric.
Do the same thing later at high noon, and now you get 8.3 or 8.4 on a bright sort of day (above Isc rating) and sure enough you get 8.3 to the battery when connected.
Way too easy. Unreal how people still want to use Imp with PWM and get themselves all mixed up. :(
MPPT expected amps is totally different, but if you have the panel watts you can do the PWM amps as the standard you should at least be getting, and then do the MPPT calculation to see if you get more or less than what you should get with PWM. You do not always get more with MPPT. Usually is is pretty much a wash. BTDT many times. My poor old multimeter and Trimetric get a good workout when we go camping. :)
Like previously mentioned, with my three 100w panels and my PWM Solar 30 controller, I got 18.6 amps showing on the Trimetric to the battery. Same as three Iscs worth. With my 20 Tracer MPPT same panels, series or parallel no diff, same place etc, never saw 19 or more amps. It disn't even hit the 260w/20amp limit of the controller. I was just as well off with the Solar 30 PWM for amps to the battery. And that is with my tilted twirler, so that is as good as it can get.
However, as stated I sometimes use my 255w 24v panel instead of the three 100s (swapping between 5er and camper) so the MPPT is required to run the 255w 24---but it doesn't make any diff for amps to the battery.
