solar panel output questionable

[gettinthere]

MS, you hinted in the past that I should have 2 controllers for my 2 solar panels. They are on the bimini and one is often shaded by the boom.
I'm having some work done to the rig so the boom is off. I just checked at 11am, clear sky and there is nothing shading the panels. Yet with two 140w panels I'm only seeing 13 amps at the victron. Frig is not running. My understanding is that I should be close to 20 amps. I've checked the wiring at the panel boxes and everything is correct and tight.
I put a DC clamp on ammeter on the positive wire going into the Blue Sky 2512i charge controller and read 15 amps. The house battery bank output read 1 amp. So I have about an amp unaccounted for. Not surprised.
But...when I clamped the ammeter on the positive feed from the charge controller to the house bank it read zero. Huh?

SOC is reading in the mid 70% and voltage is reading 12.8. No wind.

And its in the hi 70's

 

[Maine Sail]

MS, you hinted in the past that I should have 2 controllers for my 2 solar panels. They are on the bimini and one is often shaded by the boom.
I'm having some work done to the rig so the boom is off. I just checked at 11am, clear sky and there is nothing shading the panels. Yet with two 140w panels I'm only seeing 13 amps at the victron. Frig is not running. My understanding is that I should be close to 20 amps. I've checked the wiring at the panel boxes and everything is correct and tight.
I put a DC clamp on ammeter on the positive wire going into the Blue Sky 2512i charge controller and read 15 amps. The house battery bank output read 1 amp. So I have about an amp unaccounted for. Not surprised.
But...when I clamped the ammeter on the positive feed from the charge controller to the house bank it read zero. Huh?

SOC is reading in the mid 70% and voltage is reading 12.8. No wind.

And its in the hi 70's

At a panel temp of 113F/45C you should be seeing about 6.3A from each panel. You only get the 7.91A at 77F panel temp... Ipmax at 45C rating is about 6.3A on a Kyocera 140W panel... You could see some MPPT boost too.

 

[Bill Roosa]

could it also be part of the reduced "max factory output" figure that the panels are horizontal and not "full on" to the sun?
Don'w know your location but if you are near 40 N lat the sun angle a noonish would be like 50 degrees from the vertical. the sine of 50 is about .75 which would mean max output would only be 75% of the factory stated max.
FWIW

 

[gettinthere]

OK you guys answered part of the question...I should not be expecting 18 to 20 amps. My misunderstanding.

But why the zero amp reading at the battery with victron SOC of 75%? Might I have been at 100% and the victron was that far off? I did notice that when the frig kicked on, the wind gen started turning. Might have been coincidental that the breeze picked up?
This morning I'm at 12.32v and 73% SOC with no sun or wind and only about 1 or 2 amp draw