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Solar pv batteries distance to CU
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<blockquote data-quote="binky" data-source="post: 501234" data-attributes="member: 490"><p>biggest issue with smaller size cables is it can cause voltage to rise, so if you are near top limit on your grid supply, then it can push the voltages higher and cause the inverter to shut down.</p><p></p><p>I had a job where the supply is 16mm over a 110m run, the customer wasn't keen on shelling out £3k for the new cable or digging long trenches on the access track to his barn, so we fitted the system anyway. The system was underperforming forecast, so we checked the grid voltages and they were at top limit, so we complained to Western Power. They have since replaced the pole transformer and dropped the set voltages down to a much lower level, and everything has worked fine since. The customer now wants another set of panels on the same barn roof, which I wasn't keen on fitting, but, I calculated the resistances and the subsequent likely rise in voltages. I was surprised how little difference it made, and it would keep the system voltage well within spec, so we wil be fitting a second set of panels sometime soon. Energy dissipation was around 80/100W over the length of the cable - a light bulb basically. I doubt it would actually see that full energy loss, as the customer has a plant room about half way for his bore hole, and from this room there is also a supply to his jacuzzi, which will be programmed to take advantage of the solar.</p><p></p><p>So whilst we like to avoid more than 1% losses over the cable, in reality it's OK in the right circumstances. At normal 3% 16mm would be fine at 100m run</p></blockquote><p></p>
[QUOTE="binky, post: 501234, member: 490"] biggest issue with smaller size cables is it can cause voltage to rise, so if you are near top limit on your grid supply, then it can push the voltages higher and cause the inverter to shut down. I had a job where the supply is 16mm over a 110m run, the customer wasn't keen on shelling out £3k for the new cable or digging long trenches on the access track to his barn, so we fitted the system anyway. The system was underperforming forecast, so we checked the grid voltages and they were at top limit, so we complained to Western Power. They have since replaced the pole transformer and dropped the set voltages down to a much lower level, and everything has worked fine since. The customer now wants another set of panels on the same barn roof, which I wasn't keen on fitting, but, I calculated the resistances and the subsequent likely rise in voltages. I was surprised how little difference it made, and it would keep the system voltage well within spec, so we wil be fitting a second set of panels sometime soon. Energy dissipation was around 80/100W over the length of the cable - a light bulb basically. I doubt it would actually see that full energy loss, as the customer has a plant room about half way for his bore hole, and from this room there is also a supply to his jacuzzi, which will be programmed to take advantage of the solar. So whilst we like to avoid more than 1% losses over the cable, in reality it's OK in the right circumstances. At normal 3% 16mm would be fine at 100m run [/QUOTE]
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Solar pv batteries distance to CU
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