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Combining Power Souces
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<blockquote data-quote="binky" data-source="post: 541934" data-attributes="member: 490"><p>Bargain, i didn't look properly the first time, but that's still over £6k. </p><p></p><p>Not my best explanation, so, 100kw array, will be at a rough guess at least 20 DC cables to run 800m that's a shed load of cabling between array and inverter, and assuming buried in ducting, also means problems with heating from cable bunching. I'm not sure what size cable you would need over that distance, but undersize it at all and that will slightly strangle the DC input to the inverters, which on dark winter days, and start-up/ shutdown times of day will drop the inverter power to its lower efficiency operation for longer periods of time. If you look at any solar farm, they have multiple substations to keep the DC runs as short as possible, usually about 200m max. You are far better off keeping the inverters close to the array and running AC back to the house, which can be done with a single cable.</p></blockquote><p></p>
[QUOTE="binky, post: 541934, member: 490"] Bargain, i didn't look properly the first time, but that's still over £6k. Not my best explanation, so, 100kw array, will be at a rough guess at least 20 DC cables to run 800m that's a shed load of cabling between array and inverter, and assuming buried in ducting, also means problems with heating from cable bunching. I'm not sure what size cable you would need over that distance, but undersize it at all and that will slightly strangle the DC input to the inverters, which on dark winter days, and start-up/ shutdown times of day will drop the inverter power to its lower efficiency operation for longer periods of time. If you look at any solar farm, they have multiple substations to keep the DC runs as short as possible, usually about 200m max. You are far better off keeping the inverters close to the array and running AC back to the house, which can be done with a single cable. [/QUOTE]
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