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Can I use a common negative bus in a 4 MPPT & 4 PV installation?

Hi All. I'm going to install my set, having 4 100/30 each one connected only to a single 450W PV, in a 12v installation. This is already discussed in a previous discussion, and this approach is for the shadows managing and also for the cost and redundancy, beeing better 4 than 1 regulator.

I wonder if, in order to save cabling from 4 to 1, and routing and path (it is thin and strechy), I can connect all the PV negatives to a single 1 cable negative in the PV side, with a section 4 times AWG previuosly selected, and way this to reach all the regulators site, where I will spread again each negative to every regulator PV- input

Positive cables will run independiently , 4 .

Can be possible?

Is there any cons, apart from that if I added new panels I must to run new negatives?

Thanks


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