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Grid Tie Solar PV Strings Overcurrent Protection
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<blockquote data-quote="MWAzhar" data-source="post: 502232" data-attributes="member: 33207"><p>Hi everyone, I am relatively new in solar PV systems so I would like to ask few questions regarding grid connected photovoltaic system mainly about the sizing of fuse since it is required to comply with the standard in my country.</p><p></p><p>For simplicity, let’s say I am designing a 10kWdc Solar array using 335W per panels . I designed the system to be 2 parallel strings connected to 1 MPPT inverter with 15 panels connected in series each string. This modern inverter has built in DC SPD and DC breaker.</p><p></p><p>Here are the solar panel’s datasheet</p><p></p><p>Voc: 41.32V</p><p></p><p>Isc:10.38A</p><p></p><p>Imp :9.72A</p><p></p><p>Maximum fuse rating 20A</p><p></p><p>My question here is, since the 2 strings are connected in parallel into 1 MPPT, does the Maximum fuse rating provided by the solar panel manufacturer also doubles? And what is the suitable size of fuse rating for each string?</p><p></p><p>Itrip &gt; 1.5x Isc</p><p></p><p>Itrip&lt; 2x Isc</p><p></p><p>Is my calculation below here correct?</p><p></p><p>Total Voc of array : 15x 41.32 = 619.8V</p><p></p><p>Total Isc of array : 10.38*2 = 20.76A</p><p></p><p>Maximum Fuse rating : 20x2 = 40A</p><p></p><p>1.5x 20.76 =31.14A</p><p></p><p>2 x 20.76 = 41.52 A</p><p></p><p>Therefore, Itrip for each string should be in the range of 31.14A to 41.52A ;</p><p></p><p>Since Maximum Fuse rating is 40A, I should use 40 A, 1000V rated fuse for both of the string?</p><p></p><p>Appreciate feedbacks.</p></blockquote><p></p>
[QUOTE="MWAzhar, post: 502232, member: 33207"] Hi everyone, I am relatively new in solar PV systems so I would like to ask few questions regarding grid connected photovoltaic system mainly about the sizing of fuse since it is required to comply with the standard in my country. For simplicity, let’s say I am designing a 10kWdc Solar array using 335W per panels . I designed the system to be 2 parallel strings connected to 1 MPPT inverter with 15 panels connected in series each string. This modern inverter has built in DC SPD and DC breaker. Here are the solar panel’s datasheet Voc: 41.32V Isc:10.38A Imp :9.72A Maximum fuse rating 20A My question here is, since the 2 strings are connected in parallel into 1 MPPT, does the Maximum fuse rating provided by the solar panel manufacturer also doubles? And what is the suitable size of fuse rating for each string? Itrip > 1.5x Isc Itrip< 2x Isc Is my calculation below here correct? Total Voc of array : 15x 41.32 = 619.8V Total Isc of array : 10.38*2 = 20.76A Maximum Fuse rating : 20x2 = 40A 1.5x 20.76 =31.14A 2 x 20.76 = 41.52 A Therefore, Itrip for each string should be in the range of 31.14A to 41.52A ; Since Maximum Fuse rating is 40A, I should use 40 A, 1000V rated fuse for both of the string? Appreciate feedbacks. [/QUOTE]
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