Tariq Posted August 18, 2020 Posted August 18, 2020 (edited) I want to add another 4 panels in series, in landscape mode , can I use, let’s say 12 meters for the positive cable, and can the negative cable be 4 meters in length These are 355 watt panels using 4 mm2 solar wire Edited August 18, 2020 by Tariq . Quote
Louisvdw Posted August 18, 2020 Posted August 18, 2020 It's a series string and the total length is that of the complete string. The length of the positive wire vs. the negative one does not impact that. A 4 mm2 wire has a rating of 48A. Your panels are in series so that should be fine as well. For the loss over the 16m distance though, you might be better off using 6 mm2, but the 4 mm2 will work just fine ( 0.4V loss more for the 4 mm2 ) Jaco P Bloem 1 Quote
Beat Posted August 25, 2020 Posted August 25, 2020 You must figure out how much current you are going to feed trough. One panel bank with panels in series might produce a max current of 9A. Here the continuous current ratings of various standard wire sections. Note that these are for ambient temperature of up to 25°C. If ambient is higher as might be the case in the roof under the sun you must downgrade. When connecting banks in parallel you must sum up the banks current for the down feed. 1.5 mm² 10A 2.5 mm² 16A 4 mm² 25A 6 mm² 35A 10 mm² 60A 15 mm² 100A Quote
Jaco De Jongh Posted August 26, 2020 Posted August 26, 2020 4 hours ago, Beat said: Here the continuous current ratings of various standard wire sections. Note that these are for ambient temperature of up to 25°C. If ambient is higher as might be the case in the roof under the sun you must downgrade. When connecting banks in parallel you must sum up the banks current for the down feed. 1.5 mm² 10A 15A 2.5 mm² 16A 25A 4 mm² 25A 30A 6 mm² 35A 40A 10 mm² 60A 50A 15 16 mm² 100A 60A Hi Beat these figures are not correct at all, please refer to the SANS regulation for correct figures. tonio and Rclegg 2 Quote
Beat Posted October 16, 2020 Posted October 16, 2020 On 2020/08/26 at 2:23 AM, Jaco De Jongh said: Hi Beat these figures are not correct at all, please refer to the SANS regulation for correct figures. Tanks for your remarks. The difference comes from the fact that I relate to the Swiss standards where I graduated el eng. The SANS figures that you corrected to seem to me to high and not save (exept 10 mm² and 16 mm²). Quote
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