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<blockquote data-quote="binky" data-source="post: 550809" data-attributes="member: 490"><p>The panel data sheet will give you Standard Test Condition power output for the panel, eg 500W. STC is 1000w/m2 irradiance, so if your irradiance meter is showing say 500w then your panel should be generating 250w for a 500w panel. Multiply that by the number of panels on the string and that's what you should see at the inverter. However, you will find irradiance fluctuates really quickly in the real world, so numbers are 'ball park'. There's no test for continuity in the strings, and you will need solar test gear like the Seaward 150 to test for insulation. </p><p></p><p>My advice, install all connections carefully, cable tie them up off the roof to the rails. Make sure the MC4s you install on the ends of the strings are done up properly, and watch the inverter start up carefully on the screen. Basically the inverter tests the system for you on start up. Fault finding - get a Seaward, they offer advice on how to do that, and there's various you tube videos</p></blockquote><p></p>
[QUOTE="binky, post: 550809, member: 490"] The panel data sheet will give you Standard Test Condition power output for the panel, eg 500W. STC is 1000w/m2 irradiance, so if your irradiance meter is showing say 500w then your panel should be generating 250w for a 500w panel. Multiply that by the number of panels on the string and that's what you should see at the inverter. However, you will find irradiance fluctuates really quickly in the real world, so numbers are 'ball park'. There's no test for continuity in the strings, and you will need solar test gear like the Seaward 150 to test for insulation. My advice, install all connections carefully, cable tie them up off the roof to the rails. Make sure the MC4s you install on the ends of the strings are done up properly, and watch the inverter start up carefully on the screen. Basically the inverter tests the system for you on start up. Fault finding - get a Seaward, they offer advice on how to do that, and there's various you tube videos [/QUOTE]
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