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12V DC wire size question
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<blockquote data-quote="Mikey B" data-source="post: 525732" data-attributes="member: 34464"><p>I wish to install an LED light strip (1M). The run to it from from my Solar Control panel fuseboard is in the order of 25M. I am confused by the online table in which we enter current draw (say 7A), nominal voltage (12V), circuit length (25M) and conductor area (1.5mm2) - this gives an answer of a Voltage drop of 37.1% or 4.45V</p><p>My query is when I attach a 25M length of cable (with no load) to the fuseboard - as a test (supply 12.8V) and measure the voltage at the end of the cable it shows 12.7V - only a loss of 0.1V where I was expecting it to be 8.25V? where am I going wrong or do I just ignore the table for resistance in the wire?</p></blockquote><p></p>
[QUOTE="Mikey B, post: 525732, member: 34464"] I wish to install an LED light strip (1M). The run to it from from my Solar Control panel fuseboard is in the order of 25M. I am confused by the online table in which we enter current draw (say 7A), nominal voltage (12V), circuit length (25M) and conductor area (1.5mm2) - this gives an answer of a Voltage drop of 37.1% or 4.45V My query is when I attach a 25M length of cable (with no load) to the fuseboard - as a test (supply 12.8V) and measure the voltage at the end of the cable it shows 12.7V - only a loss of 0.1V where I was expecting it to be 8.25V? where am I going wrong or do I just ignore the table for resistance in the wire? [/QUOTE]
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