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Two strings or not too strings, ...
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<blockquote data-quote="stuboy" data-source="post: 532520" data-attributes="member: 33489"><p>The only sane reason for having 4 strings and combiners would be if shading was a problem. If the panels have no shading then as Binky says you will be loosing more through IxR losses than you would ever gain, you might also loose in them not switching on until later in the morning due to inverter threshold voltage not being met, & 2 strings of 8 is a happy number. I always use 6mm on solar jobs regardless of the install simply as in the long run it will more than pay for itself as less resistance equals more current and more current equals more (free) watts <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /> </p><p>I would also try and run the solar cable direct to the DC switch you will be installing next to the inverter, if you should at some later date change your config on the roof you might exceed the voltage rating of house wiring and you have another set of joints which are always nice to avoid if possible.</p><p></p><p>Cheers</p><p>Stu</p></blockquote><p></p>
[QUOTE="stuboy, post: 532520, member: 33489"] The only sane reason for having 4 strings and combiners would be if shading was a problem. If the panels have no shading then as Binky says you will be loosing more through IxR losses than you would ever gain, you might also loose in them not switching on until later in the morning due to inverter threshold voltage not being met, & 2 strings of 8 is a happy number. I always use 6mm on solar jobs regardless of the install simply as in the long run it will more than pay for itself as less resistance equals more current and more current equals more (free) watts :cool: I would also try and run the solar cable direct to the DC switch you will be installing next to the inverter, if you should at some later date change your config on the roof you might exceed the voltage rating of house wiring and you have another set of joints which are always nice to avoid if possible. Cheers Stu [/QUOTE]
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