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PV on metal corrugated roof - earthing question
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<blockquote data-quote="binky" data-source="post: 540920" data-attributes="member: 490"><p>4mm will happily run 32A, it's roughly 4Amps per kW so rough figure says it's good for 8kW. However, standard power supply circuit is allowed 3% voltage drop along the cable, but for solar we like to keep voltage drop at only 1%. Higher voltage drops can cause the inverter to increase it's output voltage, if you are unlucky enough to live in an area with higher grid voltages, then the two combined can cause the inverter to shut down. Only seen that actually happen on very rare occasions, but it can. </p><p></p><p>As for RCDs, better of without those supplying on the AC inverter supply, and certainy not sharing a RCD with other circuits. RCDs shutdown in milliseconds and at less than 30mA should you do comething daft like run over a cable with the lawn mower, Grid tied inverters are designed to shut down on loss of grid supply, but they are allowed 3 seconds to do that, so basically your solar system could kill you backfeeding a shared circuit with Amps. To cause heart and lungs to stop (defribrillation) only takes around 50mA for a healthy adult.</p></blockquote><p></p>
[QUOTE="binky, post: 540920, member: 490"] 4mm will happily run 32A, it's roughly 4Amps per kW so rough figure says it's good for 8kW. However, standard power supply circuit is allowed 3% voltage drop along the cable, but for solar we like to keep voltage drop at only 1%. Higher voltage drops can cause the inverter to increase it's output voltage, if you are unlucky enough to live in an area with higher grid voltages, then the two combined can cause the inverter to shut down. Only seen that actually happen on very rare occasions, but it can. As for RCDs, better of without those supplying on the AC inverter supply, and certainy not sharing a RCD with other circuits. RCDs shutdown in milliseconds and at less than 30mA should you do comething daft like run over a cable with the lawn mower, Grid tied inverters are designed to shut down on loss of grid supply, but they are allowed 3 seconds to do that, so basically your solar system could kill you backfeeding a shared circuit with Amps. To cause heart and lungs to stop (defribrillation) only takes around 50mA for a healthy adult. [/QUOTE]
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PV on metal corrugated roof - earthing question
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