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Any help on solar array swa sizing? 4kw array needed around 20M swa from house to array.
thanks
thanks
Discuss Solar Array swa sizing in the UK Electrical Forum area at ElectriciansForums.net
I guess if the inverter is periodically altering the drive current / phase angle and monitoring its terminal voltages then it could determine the supply impedance rather like a MFT does Zs, etc. True, that is not measuring just the feed cable but the whole network, but I guess in most cases the supply impedance (i.e. leading to PSCC) from the 60-100A grid is going to be far lower than the end of sub-main for a 10-20A feed.I have never got my head around how the inverter can see the volt drop and then add to it , but apparently it does .
Is your question regarding the 230V ac or the direct current produced by the 4kW array; I read your question as the latter.Any help on solar array swa sizing? 4kw array needed around 20M swa from house to array.
thanks
Electricity cost | 27.9 | p/kWh | | | |
Solar power (max) | 4 | kW | | | |
Solar max current | 17.4 | A | | | |
Solar average/max for I2R | 0.25 | (ratio) | | | |
Solar average power | 1 | kW | | | |
Solar average current | 4.35 | A | | | |
Expected lifetime | 20 | years | | | |
Cable length | 20 | m | | | |
Cable size | 2.5mm | 4mm | 6mm | 10mm | |
Resistance | 14.8 | 9.2 | 6.2 | 3.7 | Ohm/km |
Loss | 5.60 | 3.48 | 2.34 | 1.40 | W |
Lost annual power | 47.8 | 29.7 | 20.0 | 12.0 | kWh/year |
Annual cost | 13.3 | 8.3 | 5.6 | 3.3 | £/year |
Over lifetime | 267.0 | 165.9 | 111.8 | 66.7 | £ |
Volt drop (max) | 5.15 | 3.20 | 2.16 | 1.29 | V |
Volt drop (max %) | 2.24 | 1.39 | 0.94 | 0.56 | % |
Cable size | 2.5mm | 4mm | 6mm | 10mm | 16mm | |
Resistance (per unit length) | 14.8 | 9.2 | 6.2 | 3.7 | 2.3 | Ohm/km |
Resistance (installed) | 0.296 | 0.184 | 0.124 | 0.074 | 0.046 | Ohm |
Loss power | 5.60 | 3.48 | 2.34 | 1.40 | 0.87 | W |
Lost annual energy | 47.8 | 29.7 | 20.0 | 12.0 | 7.4 | kWh/year |
Annual cost | 13.3 | 8.3 | 5.6 | 3.3 | 2.1 | £/year |
Over lifetime | £266.95 | £165.94 | £111.83 | £66.74 | £41.49 | |
Volt drop (max) | 5.15 | 3.20 | 2.16 | 1.29 | 0.80 | V |
Volt drop (max %) | 2.24 | 1.39 | 0.94 | 0.56 | 0.35 | % |
| | | | | | |
Cable cost (per unit) | £1.74 | £2.36 | £3.08 | £4.75 | £7.09 | £/m (Superlec LSZH Apr 2022) |
Cable cost (installed) | £34.80 | £47.20 | £61.60 | £95.00 | £141.80 | |
Total cost (cable + loss) | £301.75 | £213.14 | £173.43 | £161.74 | £183.29 | |
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