Hi Recently about two weeks ago we had our Solar PV system operational. Here are the specs
13.65 Kwp system (42 Hanwha Duo-G5 325 Watt Panels)
2 SMA US-40 6.0 Inverters
midnite Rapid Shut down system
2 Arrays of 21 Panels
Each Array with two strings in 12/9 configuration.
The problem I see is that even with a capacity of 13.65 Kwp, I have never seen the PV output to go over 6500 watts at any given time (On a bright sunny day @about 68-70 degree F).
No Shading, my roof is Flat with an Azimuth of 203.
I was expecting that I at least get 10K-12K output, but max I see is 6.5K. Spoke to the installer, he is also baffled. He is saying perhaps the Rapid Shut down system might be causing a problem.
When monitoring the DC side instantaneous values, I do see as soon as String A crosses 2500 Watts, String B starts to degrade rapidly and combined the total Wattage never crosses 3200 - 3300 watts. For example Yesterday @ ~ 3:30 PM, String A showed 2485 Watts ( 2485/12 = 207 watts/panel), but String B dropped down to 714 Watts (714/9 = 79 watts/panel).
Next, I Plan to run the system for a day or two without the Rapid Shut down system for a couple of days and see if that makes a difference.
Anybody else experience something similar, Any insight will be greatly appreciated.
Thanks again.
Roger
13.65 Kwp system (42 Hanwha Duo-G5 325 Watt Panels)
2 SMA US-40 6.0 Inverters
midnite Rapid Shut down system
2 Arrays of 21 Panels
Each Array with two strings in 12/9 configuration.
The problem I see is that even with a capacity of 13.65 Kwp, I have never seen the PV output to go over 6500 watts at any given time (On a bright sunny day @about 68-70 degree F).
No Shading, my roof is Flat with an Azimuth of 203.
I was expecting that I at least get 10K-12K output, but max I see is 6.5K. Spoke to the installer, he is also baffled. He is saying perhaps the Rapid Shut down system might be causing a problem.
When monitoring the DC side instantaneous values, I do see as soon as String A crosses 2500 Watts, String B starts to degrade rapidly and combined the total Wattage never crosses 3200 - 3300 watts. For example Yesterday @ ~ 3:30 PM, String A showed 2485 Watts ( 2485/12 = 207 watts/panel), but String B dropped down to 714 Watts (714/9 = 79 watts/panel).
Next, I Plan to run the system for a day or two without the Rapid Shut down system for a couple of days and see if that makes a difference.
Anybody else experience something similar, Any insight will be greatly appreciated.
Thanks again.
Roger
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