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Relative Low Performance of Domestic PV System
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<blockquote data-quote="Jena" data-source="post: 537537" data-attributes="member: 35891"><p>Thank you for your really useful comments Joules. I interrogated the inverter as you suggested and have attached images of the first two items on the scrolling information list. The first shows a voltage of 167.0V and 0.2A. The second line on the list displayed a voltage of 1.6V and 0.1A. Lines three and four were in a similar format, but both showed voltages of 0.0V and a amperages of 0.1A. There are only two cables entering and then exiting the isolation box located before the inverter (please see image). Forgive my ignorance, but could one cable be from one string and the other from the string located on the adjacent roof? Alternatively, could one cable be from a single string made up of all 10 panels, whilst the second cable just completes the circuit back to the panels? As I wrote earlier, I am no electrician.</p><p></p><p>Probably not the best day to be looking at the system performance figures given that it is exceptionally gloomy today, with current power output only being a miserly 20W and I guess readings being subject to inaccuracies from baseline noise, perhaps. I’m not sure whether this helps you to comment further on our system, but any additional thoughts would be appreciated. I do possess a clamp voltmeter and wondered whether trying to measure DC current and voltage in the cables entering the inverter might be useful. Yesterday was also overcast and we managed only 0.4 kWh and our nearby friends produced 1.6 kWh. Many thanks.</p></blockquote><p></p>
[QUOTE="Jena, post: 537537, member: 35891"] Thank you for your really useful comments Joules. I interrogated the inverter as you suggested and have attached images of the first two items on the scrolling information list. The first shows a voltage of 167.0V and 0.2A. The second line on the list displayed a voltage of 1.6V and 0.1A. Lines three and four were in a similar format, but both showed voltages of 0.0V and a amperages of 0.1A. There are only two cables entering and then exiting the isolation box located before the inverter (please see image). Forgive my ignorance, but could one cable be from one string and the other from the string located on the adjacent roof? Alternatively, could one cable be from a single string made up of all 10 panels, whilst the second cable just completes the circuit back to the panels? As I wrote earlier, I am no electrician. Probably not the best day to be looking at the system performance figures given that it is exceptionally gloomy today, with current power output only being a miserly 20W and I guess readings being subject to inaccuracies from baseline noise, perhaps. I’m not sure whether this helps you to comment further on our system, but any additional thoughts would be appreciated. I do possess a clamp voltmeter and wondered whether trying to measure DC current and voltage in the cables entering the inverter might be useful. Yesterday was also overcast and we managed only 0.4 kWh and our nearby friends produced 1.6 kWh. Many thanks. [/QUOTE]
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Relative Low Performance of Domestic PV System
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