I am putting together a solar array of 4 590W solar panels ( https://www.renogy.com/products/renogy-bifacial-590-watt-n-type-monocrystalline-solar-panel ). I’d prefer 2 controllers, each supporting 2 panels as the space it tight for adding more controllers. Can someone help me in sizing the correct …

Take a look at the MPPT calculator: [image] MPPT Calculator - Victron Energy MPPT Calculator - Victron Energy

Thank you Matthias. I am a novice and tried using the calculator. In the drop down of the solar panels the panels I acquired are not present. So I selected the 550W panels. After putting in other information, the response I got was that no controllers were found.

You can also enter all parameters of your panel manually. Please make a screenshot. I guess you entered something wrong.

Here is a picture: [image] I’m guessing that if I have 4 panels but want to have 2 controllers manage 2 panels each this is what I would put in. If I change Series to 1 and Strings to 4, same answer. But if I make Series 1 and Strings 3, I get an answer. Not sure if that is helpful

If you have 1 controller managing 2 panels is series, then series is 2 and number of strings is 1.

you wont find any match on the mppt calculator, your operating temperatures is wild. -40 to 85 degrees Celsius. Victron mppts are usually rated for -30 to 60 degrees Celsius a 150/35 MPPT x2 should work for you.

[image] Chris: was size solar DC cable you used? Hello Chris, I used standard 6 mm² PV cables [image] Chris: Did you run two sets of positive and negatives wires back to your MPPT or did you use Y cables at the panel end to allow one set of cables back to MPPT? I used Y connectors at…

Sizing MPPT Solar Contoller for 4 550W Solar panels

DIY

TomBerger August 27, 2025, 8:14pm 7

I have four 540 Wp solar modules in a 2s2p configuration connected to a single Smartsolar 150/45. It’s a great fit.

Solar Upgrade Project, which panels and MPPT?

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Sizing MPPT Solar Contoller for 4 550W Solar panels

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