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wfred · 02-22-2019, 08:22 PM

I need to confirm what size MPPT controller will work with these panels. I'm looking at 4 renogy 300watt 24v panels in parallel. The open circuit voltage is 39.82v and short circuit current is 9.78amps per panel. I am planning on a victron smart solar 150/85 MPPT controller. Is there anything i am not considering or a reason this wont work?

Thanks,

Fred

Isaac-1 · 02-22-2019, 08:58 PM

Why are you planning on running them in parallel?

jcussen · 02-22-2019, 09:11 PM

Will work, might consider series/parallel also, you will be able to use smaller wiring.

wfred · 02-22-2019, 09:22 PM

Quote:

Originally Posted by Isaac-1

Why are you planning on running them in parallel?

Would i be better off running a pair in series?

Isaac-1 · 02-22-2019, 09:32 PM

Running series parallel would let you get away with running much smaller wire size from the panels to the MPPT controller.

Ivylog · 02-23-2019, 09:11 AM

A 150/85 amp should be fine. X4 on series-parallel.

SSTraveler · 02-23-2019, 10:33 AM

Consider the Victron Smart Controller with bluetooth capability, I love mine. So easy to check and make changes to settings. Checkout the Victron site new MPPT sizing calculator, https://www.victronenergy.com/solar-charge-controllers. The 150/85 is perfect for your panels. The AmSolar site (https://amsolar.com/rv-solar/support) and Renogy site is very helpful, particularly this Renogy Installation Guide. Good luck with your install, I really liked doing mine!