little help please with test report p.v

[new sparks]

In a little pickle any help would be great

i have 3 185 watt panels in a string, for mcs inspection next week just filling out test report ( i know small system but no cash left after all the ££££ gone to get this far )

array parmeters voc 133.8
isc 5.8

string test voc 129
isc 1.6

sun 700r (i think i am reading the meter correctly)
temp was 15c

got this far but its the calc to check if all is ok im a bit lost really

any help would be good

thanks keith

 

[yellowvanman]

Your stated Isc of 5.8A I assume is the STC conditions. So @ 1000W/m2 you should get 5.8A from your string.
When you did your test you measured 1.6A but I'm not sure what the '700r' is supposed to represent.
If 5.8A is @ 1000W/m2 then when you read 1.6A I would have expected an irradiance measurement in the region of 275W/m2 (using the following calculations - 1000 x 1.6/5.8)

The ambient temperature of 15C is not the temperature required to confirm Voc is correct - you need the temperature of the panel itself - although measured voltage of 129V against expected 133.8V looks good enough (<5% error).

 

[new sparks]

could not workout what was going wrong . thank you for that it must have been the sun reading i had wrong

many thanks