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Relative Low Performance of Domestic PV System
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<blockquote data-quote="Bob Smith" data-source="post: 537614" data-attributes="member: 35176"><p>Hi Jena</p><p></p><p>sorry if we brought with confusion with the orientation of the panels. Effectively with your set up (South and South East with a 22.5deg difference) the situation is not as extreme as for a 180°.</p><p></p><p>Nonetheless, unless you purchased knowingly a one string inverter. It is always best practice when going for a string inverter to have at least 2 string.</p><p>Even when all the panels are facing the same way and do not experience any shade, you are not prevented for any type of fault and if a panel fails the whole string has a reduced performance (unless you have optimizer (kind of bypasser ...)</p><p></p><p>You mention that your inverter has a lower minimum voltage to start. What is it?</p><p></p><p>It is clear that in winter and having the panels just now, it is difficult to correctly judge the impact of your set over a whole year vs the same configuration but on two strings.... </p><p>At least you now have a reasonable root cause to challenge your installer (in a nice and polite way, you still need him lol )</p><p>In any case he must be able to justify his decision and bring you pros and cons vs a two-string installation (he may not have done a written analysis during his design phase but he must have installed many arrays on 2 strings, and maybe just mentally he decided that for yours one string would be enough). Then you can challenge his analysis.</p><p></p><p>The benefits must be for you and not for him (eg easier installation).</p></blockquote><p></p>
[QUOTE="Bob Smith, post: 537614, member: 35176"] Hi Jena sorry if we brought with confusion with the orientation of the panels. Effectively with your set up (South and South East with a 22.5deg difference) the situation is not as extreme as for a 180°. Nonetheless, unless you purchased knowingly a one string inverter. It is always best practice when going for a string inverter to have at least 2 string. Even when all the panels are facing the same way and do not experience any shade, you are not prevented for any type of fault and if a panel fails the whole string has a reduced performance (unless you have optimizer (kind of bypasser ...) You mention that your inverter has a lower minimum voltage to start. What is it? It is clear that in winter and having the panels just now, it is difficult to correctly judge the impact of your set over a whole year vs the same configuration but on two strings.... At least you now have a reasonable root cause to challenge your installer (in a nice and polite way, you still need him lol ) In any case he must be able to justify his decision and bring you pros and cons vs a two-string installation (he may not have done a written analysis during his design phase but he must have installed many arrays on 2 strings, and maybe just mentally he decided that for yours one string would be enough). Then you can challenge his analysis. The benefits must be for you and not for him (eg easier installation). [/QUOTE]
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Relative Low Performance of Domestic PV System
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