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Solar pv batteries distance to CU
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<blockquote data-quote="binky" data-source="post: 502240" data-attributes="member: 490"><p>cable sizing is a bit different on DC systems, as few articles refer to it except for car/ leisure battery systems at much lower voltages. You are working at 360V and around 8 Amps per set of panels, so even a cable as small as 1.5mm will handle the ampage. (general rule, the higher the voltage the smaller the cable) SWA is usually rated at around 1000V or 600V, so can easily handle 360V (albeit under stalled conditions the voltage can be higher, but not by much - look at Voc figure). so really we are just looking at voltage drop / cable losses, for which this fomulae is standard, but based on 240V so will oversize cable <a href="https://the-regs.co.uk/blog/?p=481" target="_blank">https://the-regs.co.uk/blog/?p=481</a>. I'll dig out my regs book later and do some numbers. </p><p></p><p> This tool seems fine <a href="https://www.solar-wind.co.uk/info/dc-cable-wire-sizing-tool-low-voltage-drop-calculator" target="_blank">https://www.solar-wind.co.uk/info/dc-cable-wire-sizing-tool-low-voltage-drop-calculator</a> and would suggest 6mm is fine. Up it to 10mm if you like as any reduction in voltage drop improves performance. </p></blockquote><p></p>
[QUOTE="binky, post: 502240, member: 490"] cable sizing is a bit different on DC systems, as few articles refer to it except for car/ leisure battery systems at much lower voltages. You are working at 360V and around 8 Amps per set of panels, so even a cable as small as 1.5mm will handle the ampage. (general rule, the higher the voltage the smaller the cable) SWA is usually rated at around 1000V or 600V, so can easily handle 360V (albeit under stalled conditions the voltage can be higher, but not by much - look at Voc figure). so really we are just looking at voltage drop / cable losses, for which this fomulae is standard, but based on 240V so will oversize cable [URL="https://the-regs.co.uk/blog/?p=481"]https://the-regs.co.uk/blog/?p=481[/URL]. I'll dig out my regs book later and do some numbers. This tool seems fine [URL="https://www.solar-wind.co.uk/info/dc-cable-wire-sizing-tool-low-voltage-drop-calculator"]https://www.solar-wind.co.uk/info/dc-cable-wire-sizing-tool-low-voltage-drop-calculator[/URL] and would suggest 6mm is fine. Up it to 10mm if you like as any reduction in voltage drop improves performance. [/QUOTE]
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Solar pv batteries distance to CU
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