McGuywer Posted June 7, 2023 Share Posted June 7, 2023 Hallo! So, according to Wiring Unlimited from Victron (https://www.victronenergy.com/upload/documents/The_Wiring_Unlimited_book/43562-Wiring_Unlimited-pdf-en.pdf), if I have a 30Amp PWM and I want to add panels, I need to have a 35mm2 cable when I have 15meters: But in the same manual, they say Solar Cable is 4mm2 or 6mm2. The MC4 connecters looks like 4mm2 as well? So how do I size my cable when I am pulling 30amps over +- 30meters? Quote Link to comment Share on other sites More sharing options...
Eurard Posted June 7, 2023 Share Posted June 7, 2023 (edited) or 6mm cable yes The manual means 4mm and 6mm, they are confusing area with diameter You can run 6mm SOLAR cable for 30m as well https://solarpanelsvenue.com/calculator/wire-sizing-calculator/wire-sizing-calculator.htm You can go 4mm for max 20m odd at 30Amps. But just go 6mm, much better. Edited June 7, 2023 by Eurard McGuywer 1 Quote Link to comment Share on other sites More sharing options...
Chris_S Posted June 9, 2023 Share Posted June 9, 2023 On 2023/06/07 at 2:08 PM, McGuywer said: Hallo! So, according to Wiring Unlimited from Victron (https://www.victronenergy.com/upload/documents/The_Wiring_Unlimited_book/43562-Wiring_Unlimited-pdf-en.pdf), if I have a 30Amp PWM and I want to add panels, I need to have a 35mm2 cable when I have 15meters: But in the same manual, they say Solar Cable is 4mm2 or 6mm2. The MC4 connecters looks like 4mm2 as well? So how do I size my cable when I am pulling 30amps over +- 30meters? Have your combiner close to the charge controller. Then only use 6mm cable once strings are combined. McGuywer 1 Quote Link to comment Share on other sites More sharing options...
Vaal Posted June 11, 2023 Share Posted June 11, 2023 (edited) On 2023/06/07 at 2:08 PM, McGuywer said: Hallo! So, according to Wiring Unlimited from Victron (https://www.victronenergy.com/upload/documents/The_Wiring_Unlimited_book/43562-Wiring_Unlimited-pdf-en.pdf), if I have a 30Amp PWM and I want to add panels, I need to have a 35mm2 cable when I have 15meters: But in the same manual, they say Solar Cable is 4mm2 or 6mm2. The MC4 connecters looks like 4mm2 as well? So how do I size my cable when I am pulling 30amps over +- 30meters? This table is for the cable between your battery and inverter and battery fuse. I prefer to spend the couple of R extra to get thicker battery cable due to less losses. The losses will still be there, long after the R150 saved was spent on something else. I used 6mm² pv cable, even when the string only deliver about 11A max at 220v DC. Edited June 11, 2023 by Vaal Quote Link to comment Share on other sites More sharing options...
chrisc Posted June 11, 2023 Share Posted June 11, 2023 I used 10mm cable when 12 panels were wired in 6 groups of 2 in series. The current flow from the panels in full sunshine could be 60 amps. The owner was using a Solar Charge controller with a low maximum PV voltage input Quote Link to comment Share on other sites More sharing options...
SolarDIY Posted June 13, 2023 Share Posted June 13, 2023 I use 6mm² pv cable . The maximum rating is around 50-55 amps. That will give you an idea of how to connect and based on how many panels you are going to use. McGuywer 1 Quote Link to comment Share on other sites More sharing options...
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