May 29, 20197 yr You could test them before the sun is up. If there is one string with a faulty connector you should see a voltage drop on that string.
May 29, 20197 yr Otherwise put a clamp meter on the strings when the sun is out... compare the readings vs the expected...
May 29, 20197 yr Are you also 100% sure it is not a setting on the inverter that is causing the problem? The current is being limited somewhere?
May 30, 20197 yr 18*175W = 4950W I can see a gradual decline, but not the amount you lose. I get around 80% yield mid day.
June 2, 20197 yr Author Thanks for all the replies. I managed to find the fault without getting dirty in my roof. I decided to measure the amps before the fuse box and calculated the watts. I calculated that Im getting around 75% before fuse box vs current 30%. With a sigh of relieve (no faulty panels), I connected the fuses to measure output after fuse box. Drum roll........... Yes, the installer did insert two blown fuses in my new system, R300 later, Im producing 72%. I feel a bit like shouting at an internet provider for not having internet, just to find that the internet cable was unplugged. Thanks for all the help, still got value from the forum for fault finding procedures. 🙏🙏🙏
June 2, 20197 yr 58 minutes ago, 31shkom said: Yes, the installer did insert two blown fuses in my new system, R300 later, Im producing 72%. I feel a bit like shouting at an internet provider for not having internet, just to find that the internet cable was unplugged. Thanks for all the help, still got value from the forum for fault finding procedures. Always good to double check this. Were they blown at commissioning or did they blow during or after... just being a pedantic guy, sorry... Just in case something else is hidden in the detail.
June 2, 20197 yr Author 4 hours ago, Mark said: Always good to double check this. Were they blown at commissioning or did they blow during or after... just being a pedantic guy, sorry... Just in case something else is hidden in the detail. I'm 99 % sure they were defective from the start as the output were 50% off, from my calculations from the very 1 St hour.
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