Comments on: Photovoltaic (solar power) system http://www.lessthan2degrees.info We must ensure Global Warming does not exceed 2 degrees C Wed, 30 Nov 2011 00:08:00 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: admin http://www.lessthan2degrees.info/house/photovoltaic-system/comment-page-1/#comment-800 admin Thu, 10 Nov 2011 22:29:23 +0000 http://www.lessthan2degrees.info/?page_id=196#comment-800 Its tricky to test the inverter, I was lucky in having a neighbour with the same inverter and panels 1km up the road, so we tested at midday for peak power on a few occasions and corrected for the number of panels – daily figures are just a guide. Orientation is not a great issue as long as its close (from north to east or west would be about 15-20% loss), but shading is with a single inverter. You would have similar issues to us – we have shading in morning and evening but not during the day and it looses us about 15%. The only option for persistent shading is to drive the panels independently or in smaller groups, either by putting on panel level inverters or by using separate MPP (Maximum power point) trackers. Both are expensive after the fact. Hope this helps. Its tricky to test the inverter, I was lucky in having a neighbour with the same inverter and panels 1km up the road, so we tested at midday for peak power on a few occasions and corrected for the number of panels – daily figures are just a guide.
Orientation is not a great issue as long as its close (from north to east or west would be about 15-20% loss), but shading is with a single inverter. You would have similar issues to us – we have shading in morning and evening but not during the day and it looses us about 15%.
The only option for persistent shading is to drive the panels independently or in smaller groups, either by putting on panel level inverters or by using separate MPP (Maximum power point) trackers. Both are expensive after the fact.
Hope this helps.

]]> By: Linden http://www.lessthan2degrees.info/house/photovoltaic-system/comment-page-1/#comment-793 Linden Fri, 21 Oct 2011 03:21:42 +0000 http://www.lessthan2degrees.info/?page_id=196#comment-793 Yes it's me .... My SMA is down about 20% on projected (ave is 18Kw/day - should be 25ish) ... I've got 100ms of panels ... But orientation / tree shadow is an issue How hard was it to test the inverter looks like your having fun Linden (Sitting at Dickies for another month) ROTH Yes it’s me …. My SMA is down about 20% on projected (ave is 18Kw/day – should be 25ish) … I’ve got 100ms of panels … But orientation / tree shadow is an issue

How hard was it to test the inverter

looks like your having fun

Linden (Sitting at Dickies for another month) ROTH

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