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Two strings or not too strings, ...
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<blockquote data-quote="stuboy" data-source="post: 532914" data-attributes="member: 33489"><p>OK the calcs are in. </p><p></p><p>In this example I have used 2 lengths of 5m long wires to hook up the array. I chose 8 panels in series producing 1000W (3.3A) and used 4250KWh as the total yearly yield (average for a 3.68Kw system in the uk).</p><p></p><p>The results are in money saved in 20 years ( @50pence a unit) ... from 1mm squared cable up:-</p><p></p><p>1.5mm squared cable saves £27.77 on 1mm</p><p>2.5mm squared cable saves £21.71 on 1.5mm</p><p>4.0mm squared cable saves £12.96 on 2.5mm</p><p>6.0mm squared cable saves £7.08 on 4mm</p><p>10mm squared cable saves £5.79 on 6mm</p><p>16mm squared cable saves £3.15 on 10mm</p><p>25mm squared cable saves £1.96 on 16mm</p><p></p><p>Now taking into account the extra cost of our 10m long cable the 6mm cable (currently) £3.20 more than 4mm. 10mm (if you can get it) £6.54 more than 6mm.</p><p></p><p>So by my calculations on this install the extra cable thickness has paid for itself after... drum roll......</p><p></p><p>Using 6mm instead of 4mm cable pays for itself after 9 years and a month</p><p>Using 10mm instead of 6mm cable pays for itself after 22 years 6 months (good luck getting 10mm in a standard MC4 though!)</p><p></p><p>Cheers</p><p>Stuart</p></blockquote><p></p>
[QUOTE="stuboy, post: 532914, member: 33489"] OK the calcs are in. In this example I have used 2 lengths of 5m long wires to hook up the array. I chose 8 panels in series producing 1000W (3.3A) and used 4250KWh as the total yearly yield (average for a 3.68Kw system in the uk). The results are in money saved in 20 years ( @50pence a unit) ... from 1mm squared cable up:- 1.5mm squared cable saves £27.77 on 1mm 2.5mm squared cable saves £21.71 on 1.5mm 4.0mm squared cable saves £12.96 on 2.5mm 6.0mm squared cable saves £7.08 on 4mm 10mm squared cable saves £5.79 on 6mm 16mm squared cable saves £3.15 on 10mm 25mm squared cable saves £1.96 on 16mm Now taking into account the extra cost of our 10m long cable the 6mm cable (currently) £3.20 more than 4mm. 10mm (if you can get it) £6.54 more than 6mm. So by my calculations on this install the extra cable thickness has paid for itself after... drum roll...... Using 6mm instead of 4mm cable pays for itself after 9 years and a month Using 10mm instead of 6mm cable pays for itself after 22 years 6 months (good luck getting 10mm in a standard MC4 though!) Cheers Stuart [/QUOTE]
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