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Three strings, one MPPT


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PV Sol has suggested I can input three strings into one tracker for a Solis inverter. However the manufacturer's design software only enables 2 strings. Why has PV Sol recommended an option that isn't possible?

I've attached screenshots of both designs. I'm using Trina TSM-420DE09R.08 panels and the site is in Colchester, UK. 

25kW design PV Sol.png

25kW design Solis.png

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Thanks Martin, that would be a useful addition to advise cable combiners are needed if there's more than 2 strings per input. 

The manufacturer has since confirmed an issue with their software, it should allow 3 strings as it's within the voltage range but there was an glitch and it wasn't allowing it, but an older version was. 

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