The Ultimate Solar Power Design Guide: Less Theory More Practice (The Missing Guide For Proven Simple Fast Sizing Of Solar Electricity Systems For Your Home or Business) by Lacho Pop MSE & Dimi Avram MSE

Author:Lacho Pop MSE & Dimi Avram MSE [Pop MSE, Lacho]
Language: eng
Format: azw3
Tags: Solar Power Design
Publisher: Digital Publishing Ltd
Published: 2015-06-18T16:00:00+00:00

So, the overall distance is 7.5m. These distances are one-way run, i.e., we need one 7.5m cable for the positive direction and 7.5 m in the negative direction. Therefore, we have a wire run of 7.5m and wire length of 15m.

We have decided to go for up to 5% cable losses and use a copper cable.

The short circuit current Isc of the solar panel KD140GX-LFBS is 17.36 Amp.

Since we are not going to use fuses, our cable must be capable of providing

1.56 * Isc = 1.56 * 17.36 = 27 Amp

The correction coefficient of 1.56 is in accordance with the US National Code. This value ensures the safety of the solar panel.

From the Ohm’s law we derive:

U = b * I * R = (b * I * L) ÷ (k * S)

Where:

- I is the current, A

- L is the cable length, m

- S is the cable cross section, m2

- k is conductivity at 20°C:

for copper: kcop = 59.6 * 106Ω−1•m−1

for aluminum: kal = 37.45 * 106Ω−1•m−1

- b is a coefficient:

for DC circuit b=2

for 1-phase AC circuit b=2

for 3-phase AC power b=1.732.

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