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Green Renewable Energy Forum
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Relative Low Performance of Domestic PV System
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<blockquote data-quote="Jena" data-source="post: 537257" data-attributes="member: 35891"><p>Hello. I am hoping that somebody can help me with this conundrum. Our recently installed 4kW PV system comprises six panels positioned on a section of the roof facing south and a further four panels on an adjacent section facing south south east. Our irradiation level is 962, roof pitch 45 degrees and there is no shading. The panels are JA 395W and the inverter is a Solis 3.6. Another system installed approximately 800 metres away from our home, by the same supplier only days after ours, also benefits from similar irradiation levels, has approximately southerly orientation and no shading. In this instance the roof pitch is 35 degrees and two inverters (not Solis 3.6) were used to accommodate the 6.5kW rating of the installed 16 x 405W panels. Clearly, this second larger system is producing a greater daily output than ours and we would expect this to be in direct proportion to the rating of the two systems ie approximately 50-60% more than our system. However, when we account for system size differences, our system consistently produces a daily average of 40-50% less energy than expected. For example, yesterday (which was a sunny day for December) our system produced 5kWh and the second system 14kWh. We have contacted our installer who assures us that our output is acceptable and will monitor our system for 90 days. Please could somebody suggest why our system performance is so dramatically inferior to the second system? Are there any checks we can make, given that we are not qualified electricians? Many thanks.</p></blockquote><p></p>
[QUOTE="Jena, post: 537257, member: 35891"] Hello. I am hoping that somebody can help me with this conundrum. Our recently installed 4kW PV system comprises six panels positioned on a section of the roof facing south and a further four panels on an adjacent section facing south south east. Our irradiation level is 962, roof pitch 45 degrees and there is no shading. The panels are JA 395W and the inverter is a Solis 3.6. Another system installed approximately 800 metres away from our home, by the same supplier only days after ours, also benefits from similar irradiation levels, has approximately southerly orientation and no shading. In this instance the roof pitch is 35 degrees and two inverters (not Solis 3.6) were used to accommodate the 6.5kW rating of the installed 16 x 405W panels. Clearly, this second larger system is producing a greater daily output than ours and we would expect this to be in direct proportion to the rating of the two systems ie approximately 50-60% more than our system. However, when we account for system size differences, our system consistently produces a daily average of 40-50% less energy than expected. For example, yesterday (which was a sunny day for December) our system produced 5kWh and the second system 14kWh. We have contacted our installer who assures us that our output is acceptable and will monitor our system for 90 days. Please could somebody suggest why our system performance is so dramatically inferior to the second system? Are there any checks we can make, given that we are not qualified electricians? Many thanks. [/QUOTE]
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Relative Low Performance of Domestic PV System
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